| 1 | /* |
| 2 | * A rewrite of the original Debian's start-stop-daemon Perl script |
| 3 | * in C (faster - it is executed many times during system startup). |
| 4 | * |
| 5 | * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>, |
| 6 | * public domain. Based conceptually on start-stop-daemon.pl, by Ian |
| 7 | * Jackson <ijackson@gnu.ai.mit.edu>. May be used and distributed |
| 8 | * freely for any purpose. Changes by Christian Schwarz |
| 9 | * <schwarz@monet.m.isar.de>, to make output conform to the Debian |
| 10 | * Console Message Standard, also placed in public domain. Minor |
| 11 | * changes by Klee Dienes <klee@debian.org>, also placed in the Public |
| 12 | * Domain. |
| 13 | * |
| 14 | * Changes by Ben Collins <bcollins@debian.org>, added --chuid, --background |
| 15 | * and --make-pidfile options, placed in public domain as well. |
| 16 | * |
| 17 | * Port to OpenBSD by Sontri Tomo Huynh <huynh.29@osu.edu> |
| 18 | * and Andreas Schuldei <andreas@schuldei.org> |
| 19 | * |
| 20 | * Changes by Ian Jackson: added --retry (and associated rearrangements). |
| 21 | */ |
| 22 | |
| 23 | #include <config.h> |
| 24 | #include <compat.h> |
| 25 | |
| 26 | #include <dpkg/macros.h> |
| 27 | |
| 28 | #if defined(__linux__) |
| 29 | # define OS_Linux |
| 30 | #elif defined(__GNU__) |
| 31 | # define OS_Hurd |
| 32 | #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) |
| 33 | # define OS_FreeBSD |
| 34 | #elif defined(__NetBSD__) |
| 35 | # define OS_NetBSD |
| 36 | #elif defined(__OpenBSD__) |
| 37 | # define OS_OpenBSD |
| 38 | #elif defined(__DragonFly__) |
| 39 | # define OS_DragonFlyBSD |
| 40 | #elif defined(__APPLE__) && defined(__MACH__) |
| 41 | # define OS_Darwin |
| 42 | #elif defined(__sun) |
| 43 | # define OS_Solaris |
| 44 | #elif defined(_AIX) |
| 45 | # define OS_AIX |
| 46 | #elif defined(__hpux) |
| 47 | # define OS_HPUX |
| 48 | #else |
| 49 | # error Unknown architecture - cannot build start-stop-daemon |
| 50 | #endif |
| 51 | |
| 52 | /* NetBSD needs this to expose struct proc. */ |
| 53 | #define _KMEMUSER 1 |
| 54 | |
| 55 | #ifdef HAVE_SYS_PARAM_H |
| 56 | #include <sys/param.h> |
| 57 | #endif |
| 58 | #ifdef HAVE_SYS_SYSCALL_H |
| 59 | #include <sys/syscall.h> |
| 60 | #endif |
| 61 | #ifdef HAVE_SYS_SYSCTL_H |
| 62 | #include <sys/sysctl.h> |
| 63 | #endif |
| 64 | #ifdef HAVE_SYS_PROCFS_H |
| 65 | #include <sys/procfs.h> |
| 66 | #endif |
| 67 | #ifdef HAVE_SYS_PROC_H |
| 68 | #include <sys/proc.h> |
| 69 | #endif |
| 70 | #ifdef HAVE_SYS_USER_H |
| 71 | #include <sys/user.h> |
| 72 | #endif |
| 73 | #ifdef HAVE_SYS_PSTAT_H |
| 74 | #include <sys/pstat.h> |
| 75 | #endif |
| 76 | #include <sys/types.h> |
| 77 | #include <sys/time.h> |
| 78 | #include <sys/stat.h> |
| 79 | #include <sys/wait.h> |
| 80 | #include <sys/select.h> |
| 81 | #include <sys/ioctl.h> |
| 82 | |
| 83 | #include <assert.h> |
| 84 | #include <errno.h> |
| 85 | #include <limits.h> |
| 86 | #include <time.h> |
| 87 | #include <fcntl.h> |
| 88 | #include <dirent.h> |
| 89 | #include <ctype.h> |
| 90 | #include <string.h> |
| 91 | #include <pwd.h> |
| 92 | #include <grp.h> |
| 93 | #include <signal.h> |
| 94 | #include <termios.h> |
| 95 | #include <unistd.h> |
| 96 | #ifdef HAVE_STDDEF_H |
| 97 | #include <stddef.h> |
| 98 | #endif |
| 99 | #include <stdbool.h> |
| 100 | #include <stdarg.h> |
| 101 | #include <stdlib.h> |
| 102 | #include <stdio.h> |
| 103 | #include <getopt.h> |
| 104 | #ifdef HAVE_ERROR_H |
| 105 | #include <error.h> |
| 106 | #endif |
| 107 | #ifdef HAVE_ERR_H |
| 108 | #include <err.h> |
| 109 | #endif |
| 110 | |
| 111 | #if defined(OS_Hurd) |
| 112 | #include <hurd.h> |
| 113 | #include <ps.h> |
| 114 | #endif |
| 115 | |
| 116 | #if defined(OS_Darwin) |
| 117 | #include <libproc.h> |
| 118 | #endif |
| 119 | |
| 120 | #ifdef HAVE_KVM_H |
| 121 | #include <kvm.h> |
| 122 | #if defined(OS_FreeBSD) |
| 123 | #define KVM_MEMFILE "/dev/null" |
| 124 | #else |
| 125 | #define KVM_MEMFILE NULL |
| 126 | #endif |
| 127 | #endif |
| 128 | |
| 129 | #if defined(_POSIX_PRIORITY_SCHEDULING) && _POSIX_PRIORITY_SCHEDULING > 0 |
| 130 | #include <sched.h> |
| 131 | #else |
| 132 | #define SCHED_OTHER -1 |
| 133 | #define SCHED_FIFO -1 |
| 134 | #define SCHED_RR -1 |
| 135 | #endif |
| 136 | |
| 137 | #if defined(OS_Linux) |
| 138 | /* This comes from TASK_COMM_LEN defined in Linux' include/linux/sched.h. */ |
| 139 | #define PROCESS_NAME_SIZE 15 |
| 140 | #elif defined(OS_Solaris) |
| 141 | #define PROCESS_NAME_SIZE 15 |
| 142 | #elif defined(OS_Darwin) |
| 143 | #define PROCESS_NAME_SIZE 16 |
| 144 | #elif defined(OS_AIX) |
| 145 | /* This comes from PRFNSZ defined in AIX's <sys/procfs.h>. */ |
| 146 | #define PROCESS_NAME_SIZE 16 |
| 147 | #elif defined(OS_NetBSD) |
| 148 | #define PROCESS_NAME_SIZE 16 |
| 149 | #elif defined(OS_OpenBSD) |
| 150 | #define PROCESS_NAME_SIZE 16 |
| 151 | #elif defined(OS_FreeBSD) |
| 152 | #define PROCESS_NAME_SIZE 19 |
| 153 | #elif defined(OS_DragonFlyBSD) |
| 154 | /* On DragonFlyBSD MAXCOMLEN expands to 16. */ |
| 155 | #define PROCESS_NAME_SIZE MAXCOMLEN |
| 156 | #endif |
| 157 | |
| 158 | #if defined(SYS_ioprio_set) && defined(linux) |
| 159 | #define HAVE_IOPRIO_SET |
| 160 | #endif |
| 161 | |
| 162 | #define IOPRIO_CLASS_SHIFT 13 |
| 163 | #define IOPRIO_PRIO_VALUE(class, prio) (((class) << IOPRIO_CLASS_SHIFT) | (prio)) |
| 164 | #define IO_SCHED_PRIO_MIN 0 |
| 165 | #define IO_SCHED_PRIO_MAX 7 |
| 166 | |
| 167 | enum { |
| 168 | IOPRIO_WHO_PROCESS = 1, |
| 169 | IOPRIO_WHO_PGRP, |
| 170 | IOPRIO_WHO_USER, |
| 171 | }; |
| 172 | |
| 173 | enum { |
| 174 | IOPRIO_CLASS_NONE, |
| 175 | IOPRIO_CLASS_RT, |
| 176 | IOPRIO_CLASS_BE, |
| 177 | IOPRIO_CLASS_IDLE, |
| 178 | }; |
| 179 | |
| 180 | enum action_code { |
| 181 | ACTION_NONE, |
| 182 | ACTION_START, |
| 183 | ACTION_STOP, |
| 184 | ACTION_STATUS, |
| 185 | }; |
| 186 | |
| 187 | /* Time conversion constants. */ |
| 188 | enum { |
| 189 | NANOSEC_IN_SEC = 1000000000L, |
| 190 | NANOSEC_IN_MILLISEC = 1000000L, |
| 191 | NANOSEC_IN_MICROSEC = 1000L, |
| 192 | }; |
| 193 | |
| 194 | /* The minimum polling interval, 20ms. */ |
| 195 | static const long MIN_POLL_INTERVAL = 20 * NANOSEC_IN_MILLISEC; |
| 196 | |
| 197 | static enum action_code action; |
| 198 | static bool testmode = false; |
| 199 | static int quietmode = 0; |
| 200 | static int exitnodo = 1; |
| 201 | static bool background = false; |
| 202 | static bool close_io = true; |
| 203 | static bool mpidfile = false; |
| 204 | static bool rpidfile = false; |
| 205 | static int signal_nr = SIGTERM; |
| 206 | static int user_id = -1; |
| 207 | static int runas_uid = -1; |
| 208 | static int runas_gid = -1; |
| 209 | static const char *userspec = NULL; |
| 210 | static char *changeuser = NULL; |
| 211 | static const char *changegroup = NULL; |
| 212 | static char *changeroot = NULL; |
| 213 | static const char *changedir = "/"; |
| 214 | static const char *cmdname = NULL; |
| 215 | static char *execname = NULL; |
| 216 | static char *startas = NULL; |
| 217 | static pid_t match_pid = -1; |
| 218 | static pid_t match_ppid = -1; |
| 219 | static const char *pidfile = NULL; |
| 220 | static char *what_stop = NULL; |
| 221 | static const char *progname = ""; |
| 222 | static int nicelevel = 0; |
| 223 | static int umask_value = -1; |
| 224 | |
| 225 | static struct stat exec_stat; |
| 226 | #if defined(OS_Hurd) |
| 227 | static struct proc_stat_list *procset = NULL; |
| 228 | #endif |
| 229 | |
| 230 | /* LSB Init Script process status exit codes. */ |
| 231 | enum status_code { |
| 232 | STATUS_OK = 0, |
| 233 | STATUS_DEAD_PIDFILE = 1, |
| 234 | STATUS_DEAD_LOCKFILE = 2, |
| 235 | STATUS_DEAD = 3, |
| 236 | STATUS_UNKNOWN = 4, |
| 237 | }; |
| 238 | |
| 239 | struct pid_list { |
| 240 | struct pid_list *next; |
| 241 | pid_t pid; |
| 242 | }; |
| 243 | |
| 244 | static struct pid_list *found = NULL; |
| 245 | static struct pid_list *killed = NULL; |
| 246 | |
| 247 | /* Resource scheduling policy. */ |
| 248 | struct res_schedule { |
| 249 | const char *policy_name; |
| 250 | int policy; |
| 251 | int priority; |
| 252 | }; |
| 253 | |
| 254 | struct schedule_item { |
| 255 | enum { |
| 256 | sched_timeout, |
| 257 | sched_signal, |
| 258 | sched_goto, |
| 259 | /* Only seen within parse_schedule and callees. */ |
| 260 | sched_forever, |
| 261 | } type; |
| 262 | /* Seconds, signal no., or index into array. */ |
| 263 | int value; |
| 264 | }; |
| 265 | |
| 266 | static struct res_schedule *proc_sched = NULL; |
| 267 | static struct res_schedule *io_sched = NULL; |
| 268 | |
| 269 | static int schedule_length; |
| 270 | static struct schedule_item *schedule = NULL; |
| 271 | |
| 272 | |
| 273 | static void DPKG_ATTR_PRINTF(1) |
| 274 | warning(const char *format, ...) |
| 275 | { |
| 276 | va_list arglist; |
| 277 | |
| 278 | fprintf(stderr, "%s: warning: ", progname); |
| 279 | va_start(arglist, format); |
| 280 | vfprintf(stderr, format, arglist); |
| 281 | va_end(arglist); |
| 282 | } |
| 283 | |
| 284 | static void DPKG_ATTR_NORET DPKG_ATTR_PRINTF(1) |
| 285 | fatal(const char *format, ...) |
| 286 | { |
| 287 | va_list arglist; |
| 288 | int errno_fatal = errno; |
| 289 | |
| 290 | fprintf(stderr, "%s: ", progname); |
| 291 | va_start(arglist, format); |
| 292 | vfprintf(stderr, format, arglist); |
| 293 | va_end(arglist); |
| 294 | if (errno_fatal) |
| 295 | fprintf(stderr, " (%s)\n", strerror(errno_fatal)); |
| 296 | else |
| 297 | fprintf(stderr, "\n"); |
| 298 | |
| 299 | if (action == ACTION_STATUS) |
| 300 | exit(STATUS_UNKNOWN); |
| 301 | else |
| 302 | exit(2); |
| 303 | } |
| 304 | |
| 305 | static void * |
| 306 | xmalloc(int size) |
| 307 | { |
| 308 | void *ptr; |
| 309 | |
| 310 | ptr = malloc(size); |
| 311 | if (ptr) |
| 312 | return ptr; |
| 313 | fatal("malloc(%d) failed", size); |
| 314 | } |
| 315 | |
| 316 | static char * |
| 317 | xstrndup(const char *str, size_t n) |
| 318 | { |
| 319 | char *new_str; |
| 320 | |
| 321 | new_str = strndup(str, n); |
| 322 | if (new_str) |
| 323 | return new_str; |
| 324 | fatal("strndup(%s, %zu) failed", str, n); |
| 325 | } |
| 326 | |
| 327 | static void |
| 328 | timespec_gettime(struct timespec *ts) |
| 329 | { |
| 330 | #if defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0 && \ |
| 331 | defined(_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK > 0 |
| 332 | if (clock_gettime(CLOCK_MONOTONIC, ts) < 0) |
| 333 | fatal("clock_gettime failed"); |
| 334 | #else |
| 335 | struct timeval tv; |
| 336 | |
| 337 | if (gettimeofday(&tv, NULL) != 0) |
| 338 | fatal("gettimeofday failed"); |
| 339 | |
| 340 | ts->tv_sec = tv.tv_sec; |
| 341 | ts->tv_nsec = tv.tv_usec * NANOSEC_IN_MICROSEC; |
| 342 | #endif |
| 343 | } |
| 344 | |
| 345 | #define timespec_cmp(a, b, OP) \ |
| 346 | (((a)->tv_sec == (b)->tv_sec) ? \ |
| 347 | ((a)->tv_nsec OP (b)->tv_nsec) : \ |
| 348 | ((a)->tv_sec OP (b)->tv_sec)) |
| 349 | |
| 350 | static void |
| 351 | timespec_sub(struct timespec *a, struct timespec *b, struct timespec *res) |
| 352 | { |
| 353 | res->tv_sec = a->tv_sec - b->tv_sec; |
| 354 | res->tv_nsec = a->tv_nsec - b->tv_nsec; |
| 355 | if (res->tv_nsec < 0) { |
| 356 | res->tv_sec--; |
| 357 | res->tv_nsec += NANOSEC_IN_SEC; |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | static void |
| 362 | timespec_mul(struct timespec *a, int b) |
| 363 | { |
| 364 | long nsec = a->tv_nsec * b; |
| 365 | |
| 366 | a->tv_sec *= b; |
| 367 | a->tv_sec += nsec / NANOSEC_IN_SEC; |
| 368 | a->tv_nsec = nsec % NANOSEC_IN_SEC; |
| 369 | } |
| 370 | |
| 371 | static char * |
| 372 | newpath(const char *dirname, const char *filename) |
| 373 | { |
| 374 | char *path; |
| 375 | size_t path_len; |
| 376 | |
| 377 | path_len = strlen(dirname) + 1 + strlen(filename) + 1; |
| 378 | path = xmalloc(path_len); |
| 379 | snprintf(path, path_len, "%s/%s", dirname, filename); |
| 380 | |
| 381 | return path; |
| 382 | } |
| 383 | |
| 384 | static long |
| 385 | get_open_fd_max(void) |
| 386 | { |
| 387 | #ifdef HAVE_GETDTABLESIZE |
| 388 | return getdtablesize(); |
| 389 | #else |
| 390 | return sysconf(_SC_OPEN_MAX); |
| 391 | #endif |
| 392 | } |
| 393 | |
| 394 | #ifndef HAVE_SETSID |
| 395 | static void |
| 396 | detach_controlling_tty(void) |
| 397 | { |
| 398 | #ifdef HAVE_TIOCNOTTY |
| 399 | int tty_fd; |
| 400 | |
| 401 | tty_fd = open("/dev/tty", O_RDWR); |
| 402 | |
| 403 | /* The current process does not have a controlling tty. */ |
| 404 | if (tty_fd < 0) |
| 405 | return; |
| 406 | |
| 407 | if (ioctl(tty_fd, TIOCNOTTY, 0) != 0) |
| 408 | fatal("unable to detach controlling tty"); |
| 409 | |
| 410 | close(tty_fd); |
| 411 | #endif |
| 412 | } |
| 413 | |
| 414 | static pid_t |
| 415 | setsid(void) |
| 416 | { |
| 417 | if (setpgid(0, 0) < 0) |
| 418 | return -1: |
| 419 | |
| 420 | detach_controlling_tty(); |
| 421 | |
| 422 | return 0; |
| 423 | } |
| 424 | #endif |
| 425 | |
| 426 | static void |
| 427 | wait_for_child(pid_t pid) |
| 428 | { |
| 429 | pid_t child; |
| 430 | int status; |
| 431 | |
| 432 | do { |
| 433 | child = waitpid(pid, &status, 0); |
| 434 | } while (child == -1 && errno == EINTR); |
| 435 | |
| 436 | if (child != pid) |
| 437 | fatal("error waiting for child"); |
| 438 | |
| 439 | if (WIFEXITED(status)) { |
| 440 | int ret = WEXITSTATUS(status); |
| 441 | |
| 442 | if (ret != 0) |
| 443 | fatal("child returned error exit status %d", ret); |
| 444 | } else if (WIFSIGNALED(status)) { |
| 445 | int signo = WTERMSIG(status); |
| 446 | |
| 447 | fatal("child was killed by signal %d", signo); |
| 448 | } else { |
| 449 | fatal("unexpected status %d waiting for child", status); |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | static void |
| 454 | write_pidfile(const char *filename, pid_t pid) |
| 455 | { |
| 456 | FILE *fp; |
| 457 | int fd; |
| 458 | |
| 459 | fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC | O_NOFOLLOW, 0666); |
| 460 | if (fd < 0) |
| 461 | fp = NULL; |
| 462 | else |
| 463 | fp = fdopen(fd, "w"); |
| 464 | |
| 465 | if (fp == NULL) |
| 466 | fatal("unable to open pidfile '%s' for writing", filename); |
| 467 | |
| 468 | fprintf(fp, "%d\n", pid); |
| 469 | |
| 470 | if (fclose(fp)) |
| 471 | fatal("unable to close pidfile '%s'", filename); |
| 472 | } |
| 473 | |
| 474 | static void |
| 475 | remove_pidfile(const char *filename) |
| 476 | { |
| 477 | if (unlink(filename) < 0 && errno != ENOENT) |
| 478 | fatal("cannot remove pidfile '%s'", filename); |
| 479 | } |
| 480 | |
| 481 | static void |
| 482 | daemonize(void) |
| 483 | { |
| 484 | pid_t pid; |
| 485 | sigset_t mask; |
| 486 | sigset_t oldmask; |
| 487 | |
| 488 | if (quietmode < 0) |
| 489 | printf("Detaching to start %s...", startas); |
| 490 | |
| 491 | /* Block SIGCHLD to allow waiting for the child process while it is |
| 492 | * performing actions, such as creating a pidfile. */ |
| 493 | sigemptyset(&mask); |
| 494 | sigaddset(&mask, SIGCHLD); |
| 495 | if (sigprocmask(SIG_BLOCK, &mask, &oldmask) == -1) |
| 496 | fatal("cannot block SIGCHLD"); |
| 497 | |
| 498 | pid = fork(); |
| 499 | if (pid < 0) |
| 500 | fatal("unable to do first fork"); |
| 501 | else if (pid) { /* First Parent. */ |
| 502 | /* Wait for the second parent to exit, so that if we need to |
| 503 | * perform any actions there, like creating a pidfile, we do |
| 504 | * not suffer from race conditions on return. */ |
| 505 | wait_for_child(pid); |
| 506 | |
| 507 | _exit(0); |
| 508 | } |
| 509 | |
| 510 | /* Create a new session. */ |
| 511 | if (setsid() < 0) |
| 512 | fatal("cannot set session ID"); |
| 513 | |
| 514 | pid = fork(); |
| 515 | if (pid < 0) |
| 516 | fatal("unable to do second fork"); |
| 517 | else if (pid) { /* Second parent. */ |
| 518 | /* Set a default umask for dumb programs, which might get |
| 519 | * overridden by the --umask option later on, so that we get |
| 520 | * a defined umask when creating the pidfille. */ |
| 521 | umask(022); |
| 522 | |
| 523 | if (mpidfile && pidfile != NULL) |
| 524 | /* User wants _us_ to make the pidfile. */ |
| 525 | write_pidfile(pidfile, pid); |
| 526 | |
| 527 | _exit(0); |
| 528 | } |
| 529 | |
| 530 | if (sigprocmask(SIG_SETMASK, &oldmask, NULL) == -1) |
| 531 | fatal("cannot restore signal mask"); |
| 532 | |
| 533 | if (quietmode < 0) |
| 534 | printf("done.\n"); |
| 535 | } |
| 536 | |
| 537 | static void |
| 538 | pid_list_push(struct pid_list **list, pid_t pid) |
| 539 | { |
| 540 | struct pid_list *p; |
| 541 | |
| 542 | p = xmalloc(sizeof(*p)); |
| 543 | p->next = *list; |
| 544 | p->pid = pid; |
| 545 | *list = p; |
| 546 | } |
| 547 | |
| 548 | static void |
| 549 | pid_list_free(struct pid_list **list) |
| 550 | { |
| 551 | struct pid_list *here, *next; |
| 552 | |
| 553 | for (here = *list; here != NULL; here = next) { |
| 554 | next = here->next; |
| 555 | free(here); |
| 556 | } |
| 557 | |
| 558 | *list = NULL; |
| 559 | } |
| 560 | |
| 561 | static void |
| 562 | usage(void) |
| 563 | { |
| 564 | printf( |
| 565 | "Usage: start-stop-daemon [<option>...] <command>\n" |
| 566 | "\n"); |
| 567 | |
| 568 | printf( |
| 569 | "Commands:\n" |
| 570 | " -S, --start -- <argument>... start a program and pass <arguments> to it\n" |
| 571 | " -K, --stop stop a program\n" |
| 572 | " -T, --status get the program status\n" |
| 573 | " -H, --help print help information\n" |
| 574 | " -V, --version print version\n" |
| 575 | "\n"); |
| 576 | |
| 577 | printf( |
| 578 | "Matching options (at least one is required):\n" |
| 579 | " --pid <pid> pid to check\n" |
| 580 | " --ppid <ppid> parent pid to check\n" |
| 581 | " -p, --pidfile <pid-file> pid file to check\n" |
| 582 | " -x, --exec <executable> program to start/check if it is running\n" |
| 583 | " -n, --name <process-name> process name to check\n" |
| 584 | " -u, --user <username|uid> process owner to check\n" |
| 585 | "\n"); |
| 586 | |
| 587 | printf( |
| 588 | "Options:\n" |
| 589 | " -g, --group <group|gid> run process as this group\n" |
| 590 | " -c, --chuid <name|uid[:group|gid]>\n" |
| 591 | " change to this user/group before starting\n" |
| 592 | " process\n" |
| 593 | " -s, --signal <signal> signal to send (default TERM)\n" |
| 594 | " -a, --startas <pathname> program to start (default is <executable>)\n" |
| 595 | " -r, --chroot <directory> chroot to <directory> before starting\n" |
| 596 | " -d, --chdir <directory> change to <directory> (default is /)\n" |
| 597 | " -N, --nicelevel <incr> add incr to the process' nice level\n" |
| 598 | " -P, --procsched <policy[:prio]>\n" |
| 599 | " use <policy> with <prio> for the kernel\n" |
| 600 | " process scheduler (default prio is 0)\n" |
| 601 | " -I, --iosched <class[:prio]> use <class> with <prio> to set the IO\n" |
| 602 | " scheduler (default prio is 4)\n" |
| 603 | " -k, --umask <mask> change the umask to <mask> before starting\n" |
| 604 | " -b, --background force the process to detach\n" |
| 605 | " -C, --no-close do not close any file descriptor\n" |
| 606 | " -m, --make-pidfile create the pidfile before starting\n" |
| 607 | " --remove-pidfile delete the pidfile after stopping\n" |
| 608 | " -R, --retry <schedule> check whether processes die, and retry\n" |
| 609 | " -t, --test test mode, don't do anything\n" |
| 610 | " -o, --oknodo exit status 0 (not 1) if nothing done\n" |
| 611 | " -q, --quiet be more quiet\n" |
| 612 | " -v, --verbose be more verbose\n" |
| 613 | "\n"); |
| 614 | |
| 615 | printf( |
| 616 | "Retry <schedule> is <item>|/<item>/... where <item> is one of\n" |
| 617 | " -<signal-num>|[-]<signal-name> send that signal\n" |
| 618 | " <timeout> wait that many seconds\n" |
| 619 | " forever repeat remainder forever\n" |
| 620 | "or <schedule> may be just <timeout>, meaning <signal>/<timeout>/KILL/<timeout>\n" |
| 621 | "\n"); |
| 622 | |
| 623 | printf( |
| 624 | "The process scheduler <policy> can be one of:\n" |
| 625 | " other, fifo or rr\n" |
| 626 | "\n"); |
| 627 | |
| 628 | printf( |
| 629 | "The IO scheduler <class> can be one of:\n" |
| 630 | " real-time, best-effort or idle\n" |
| 631 | "\n"); |
| 632 | |
| 633 | printf( |
| 634 | "Exit status:\n" |
| 635 | " 0 = done\n" |
| 636 | " 1 = nothing done (=> 0 if --oknodo)\n" |
| 637 | " 2 = with --retry, processes would not die\n" |
| 638 | " 3 = trouble\n" |
| 639 | "Exit status with --status:\n" |
| 640 | " 0 = program is running\n" |
| 641 | " 1 = program is not running and the pid file exists\n" |
| 642 | " 3 = program is not running\n" |
| 643 | " 4 = unable to determine status\n"); |
| 644 | } |
| 645 | |
| 646 | static void |
| 647 | do_version(void) |
| 648 | { |
| 649 | printf("start-stop-daemon %s for Debian\n\n", VERSION); |
| 650 | |
| 651 | printf("Written by Marek Michalkiewicz, public domain.\n"); |
| 652 | } |
| 653 | |
| 654 | static void DPKG_ATTR_NORET |
| 655 | badusage(const char *msg) |
| 656 | { |
| 657 | if (msg) |
| 658 | fprintf(stderr, "%s: %s\n", progname, msg); |
| 659 | fprintf(stderr, "Try '%s --help' for more information.\n", progname); |
| 660 | |
| 661 | if (action == ACTION_STATUS) |
| 662 | exit(STATUS_UNKNOWN); |
| 663 | else |
| 664 | exit(3); |
| 665 | } |
| 666 | |
| 667 | struct sigpair { |
| 668 | const char *name; |
| 669 | int signal; |
| 670 | }; |
| 671 | |
| 672 | static const struct sigpair siglist[] = { |
| 673 | { "ABRT", SIGABRT }, |
| 674 | { "ALRM", SIGALRM }, |
| 675 | { "FPE", SIGFPE }, |
| 676 | { "HUP", SIGHUP }, |
| 677 | { "ILL", SIGILL }, |
| 678 | { "INT", SIGINT }, |
| 679 | { "KILL", SIGKILL }, |
| 680 | { "PIPE", SIGPIPE }, |
| 681 | { "QUIT", SIGQUIT }, |
| 682 | { "SEGV", SIGSEGV }, |
| 683 | { "TERM", SIGTERM }, |
| 684 | { "USR1", SIGUSR1 }, |
| 685 | { "USR2", SIGUSR2 }, |
| 686 | { "CHLD", SIGCHLD }, |
| 687 | { "CONT", SIGCONT }, |
| 688 | { "STOP", SIGSTOP }, |
| 689 | { "TSTP", SIGTSTP }, |
| 690 | { "TTIN", SIGTTIN }, |
| 691 | { "TTOU", SIGTTOU } |
| 692 | }; |
| 693 | |
| 694 | static int |
| 695 | parse_unsigned(const char *string, int base, int *value_r) |
| 696 | { |
| 697 | long value; |
| 698 | char *endptr; |
| 699 | |
| 700 | if (!string[0]) |
| 701 | return -1; |
| 702 | |
| 703 | errno = 0; |
| 704 | value = strtol(string, &endptr, base); |
| 705 | if (string == endptr || *endptr != '\0' || errno != 0) |
| 706 | return -1; |
| 707 | if (value < 0 || value > INT_MAX) |
| 708 | return -1; |
| 709 | |
| 710 | *value_r = value; |
| 711 | return 0; |
| 712 | } |
| 713 | |
| 714 | static int |
| 715 | parse_pid(const char *pid_str, int *pid_num) |
| 716 | { |
| 717 | if (parse_unsigned(pid_str, 10, pid_num) != 0) |
| 718 | return -1; |
| 719 | if (*pid_num == 0) |
| 720 | return -1; |
| 721 | |
| 722 | return 0; |
| 723 | } |
| 724 | |
| 725 | static int |
| 726 | parse_signal(const char *sig_str, int *sig_num) |
| 727 | { |
| 728 | unsigned int i; |
| 729 | |
| 730 | if (parse_unsigned(sig_str, 10, sig_num) == 0) |
| 731 | return 0; |
| 732 | |
| 733 | for (i = 0; i < array_count(siglist); i++) { |
| 734 | if (strcmp(sig_str, siglist[i].name) == 0) { |
| 735 | *sig_num = siglist[i].signal; |
| 736 | return 0; |
| 737 | } |
| 738 | } |
| 739 | return -1; |
| 740 | } |
| 741 | |
| 742 | static int |
| 743 | parse_umask(const char *string, int *value_r) |
| 744 | { |
| 745 | return parse_unsigned(string, 0, value_r); |
| 746 | } |
| 747 | |
| 748 | static void |
| 749 | validate_proc_schedule(void) |
| 750 | { |
| 751 | #if defined(_POSIX_PRIORITY_SCHEDULING) && _POSIX_PRIORITY_SCHEDULING > 0 |
| 752 | int prio_min, prio_max; |
| 753 | |
| 754 | prio_min = sched_get_priority_min(proc_sched->policy); |
| 755 | prio_max = sched_get_priority_max(proc_sched->policy); |
| 756 | |
| 757 | if (proc_sched->priority < prio_min) |
| 758 | badusage("process scheduler priority less than min"); |
| 759 | if (proc_sched->priority > prio_max) |
| 760 | badusage("process scheduler priority greater than max"); |
| 761 | #endif |
| 762 | } |
| 763 | |
| 764 | static void |
| 765 | parse_proc_schedule(const char *string) |
| 766 | { |
| 767 | char *policy_str; |
| 768 | size_t policy_len; |
| 769 | int prio = 0; |
| 770 | |
| 771 | policy_len = strcspn(string, ":"); |
| 772 | policy_str = xstrndup(string, policy_len); |
| 773 | |
| 774 | if (string[policy_len] == ':' && |
| 775 | parse_unsigned(string + policy_len + 1, 10, &prio) != 0) |
| 776 | fatal("invalid process scheduler priority"); |
| 777 | |
| 778 | proc_sched = xmalloc(sizeof(*proc_sched)); |
| 779 | proc_sched->policy_name = policy_str; |
| 780 | |
| 781 | if (strcmp(policy_str, "other") == 0) { |
| 782 | proc_sched->policy = SCHED_OTHER; |
| 783 | proc_sched->priority = 0; |
| 784 | } else if (strcmp(policy_str, "fifo") == 0) { |
| 785 | proc_sched->policy = SCHED_FIFO; |
| 786 | proc_sched->priority = prio; |
| 787 | } else if (strcmp(policy_str, "rr") == 0) { |
| 788 | proc_sched->policy = SCHED_RR; |
| 789 | proc_sched->priority = prio; |
| 790 | } else |
| 791 | badusage("invalid process scheduler policy"); |
| 792 | |
| 793 | validate_proc_schedule(); |
| 794 | } |
| 795 | |
| 796 | static void |
| 797 | parse_io_schedule(const char *string) |
| 798 | { |
| 799 | char *class_str; |
| 800 | size_t class_len; |
| 801 | int prio = 4; |
| 802 | |
| 803 | class_len = strcspn(string, ":"); |
| 804 | class_str = xstrndup(string, class_len); |
| 805 | |
| 806 | if (string[class_len] == ':' && |
| 807 | parse_unsigned(string + class_len + 1, 10, &prio) != 0) |
| 808 | fatal("invalid IO scheduler priority"); |
| 809 | |
| 810 | io_sched = xmalloc(sizeof(*io_sched)); |
| 811 | io_sched->policy_name = class_str; |
| 812 | |
| 813 | if (strcmp(class_str, "real-time") == 0) { |
| 814 | io_sched->policy = IOPRIO_CLASS_RT; |
| 815 | io_sched->priority = prio; |
| 816 | } else if (strcmp(class_str, "best-effort") == 0) { |
| 817 | io_sched->policy = IOPRIO_CLASS_BE; |
| 818 | io_sched->priority = prio; |
| 819 | } else if (strcmp(class_str, "idle") == 0) { |
| 820 | io_sched->policy = IOPRIO_CLASS_IDLE; |
| 821 | io_sched->priority = 7; |
| 822 | } else |
| 823 | badusage("invalid IO scheduler policy"); |
| 824 | |
| 825 | if (io_sched->priority < IO_SCHED_PRIO_MIN) |
| 826 | badusage("IO scheduler priority less than min"); |
| 827 | if (io_sched->priority > IO_SCHED_PRIO_MAX) |
| 828 | badusage("IO scheduler priority greater than max"); |
| 829 | } |
| 830 | |
| 831 | static void |
| 832 | set_proc_schedule(struct res_schedule *sched) |
| 833 | { |
| 834 | #if defined(_POSIX_PRIORITY_SCHEDULING) && _POSIX_PRIORITY_SCHEDULING > 0 |
| 835 | struct sched_param param; |
| 836 | |
| 837 | param.sched_priority = sched->priority; |
| 838 | |
| 839 | if (sched_setscheduler(getpid(), sched->policy, ¶m) == -1) |
| 840 | fatal("unable to set process scheduler"); |
| 841 | #endif |
| 842 | } |
| 843 | |
| 844 | #ifdef HAVE_IOPRIO_SET |
| 845 | static inline int |
| 846 | ioprio_set(int which, int who, int ioprio) |
| 847 | { |
| 848 | return syscall(SYS_ioprio_set, which, who, ioprio); |
| 849 | } |
| 850 | #endif |
| 851 | |
| 852 | static void |
| 853 | set_io_schedule(struct res_schedule *sched) |
| 854 | { |
| 855 | #ifdef HAVE_IOPRIO_SET |
| 856 | int io_sched_mask; |
| 857 | |
| 858 | io_sched_mask = IOPRIO_PRIO_VALUE(sched->policy, sched->priority); |
| 859 | if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), io_sched_mask) == -1) |
| 860 | warning("unable to alter IO priority to mask %i (%s)\n", |
| 861 | io_sched_mask, strerror(errno)); |
| 862 | #endif |
| 863 | } |
| 864 | |
| 865 | static void |
| 866 | parse_schedule_item(const char *string, struct schedule_item *item) |
| 867 | { |
| 868 | const char *after_hyph; |
| 869 | |
| 870 | if (strcmp(string, "forever") == 0) { |
| 871 | item->type = sched_forever; |
| 872 | } else if (isdigit(string[0])) { |
| 873 | item->type = sched_timeout; |
| 874 | if (parse_unsigned(string, 10, &item->value) != 0) |
| 875 | badusage("invalid timeout value in schedule"); |
| 876 | } else if ((after_hyph = string + (string[0] == '-')) && |
| 877 | parse_signal(after_hyph, &item->value) == 0) { |
| 878 | item->type = sched_signal; |
| 879 | } else { |
| 880 | badusage("invalid schedule item (must be [-]<signal-name>, " |
| 881 | "-<signal-number>, <timeout> or 'forever'"); |
| 882 | } |
| 883 | } |
| 884 | |
| 885 | static void |
| 886 | parse_schedule(const char *schedule_str) |
| 887 | { |
| 888 | char item_buf[20]; |
| 889 | const char *slash; |
| 890 | int count, repeatat; |
| 891 | size_t str_len; |
| 892 | |
| 893 | count = 0; |
| 894 | for (slash = schedule_str; *slash; slash++) |
| 895 | if (*slash == '/') |
| 896 | count++; |
| 897 | |
| 898 | schedule_length = (count == 0) ? 4 : count + 1; |
| 899 | schedule = xmalloc(sizeof(*schedule) * schedule_length); |
| 900 | |
| 901 | if (count == 0) { |
| 902 | schedule[0].type = sched_signal; |
| 903 | schedule[0].value = signal_nr; |
| 904 | parse_schedule_item(schedule_str, &schedule[1]); |
| 905 | if (schedule[1].type != sched_timeout) { |
| 906 | badusage("--retry takes timeout, or schedule list" |
| 907 | " of at least two items"); |
| 908 | } |
| 909 | schedule[2].type = sched_signal; |
| 910 | schedule[2].value = SIGKILL; |
| 911 | schedule[3] = schedule[1]; |
| 912 | } else { |
| 913 | count = 0; |
| 914 | repeatat = -1; |
| 915 | while (schedule_str != NULL) { |
| 916 | slash = strchr(schedule_str, '/'); |
| 917 | str_len = slash ? (size_t)(slash - schedule_str) : strlen(schedule_str); |
| 918 | if (str_len >= sizeof(item_buf)) |
| 919 | badusage("invalid schedule item: far too long" |
| 920 | " (you must delimit items with slashes)"); |
| 921 | memcpy(item_buf, schedule_str, str_len); |
| 922 | item_buf[str_len] = '\0'; |
| 923 | schedule_str = slash ? slash + 1 : NULL; |
| 924 | |
| 925 | parse_schedule_item(item_buf, &schedule[count]); |
| 926 | if (schedule[count].type == sched_forever) { |
| 927 | if (repeatat >= 0) |
| 928 | badusage("invalid schedule: 'forever'" |
| 929 | " appears more than once"); |
| 930 | repeatat = count; |
| 931 | continue; |
| 932 | } |
| 933 | count++; |
| 934 | } |
| 935 | if (repeatat == count) |
| 936 | badusage("invalid schedule: 'forever' appears last, " |
| 937 | "nothing to repeat"); |
| 938 | if (repeatat >= 0) { |
| 939 | schedule[count].type = sched_goto; |
| 940 | schedule[count].value = repeatat; |
| 941 | count++; |
| 942 | } |
| 943 | assert(count == schedule_length); |
| 944 | } |
| 945 | } |
| 946 | |
| 947 | static void |
| 948 | set_action(enum action_code new_action) |
| 949 | { |
| 950 | if (action == new_action) |
| 951 | return; |
| 952 | |
| 953 | if (action != ACTION_NONE) |
| 954 | badusage("only one command can be specified"); |
| 955 | |
| 956 | action = new_action; |
| 957 | } |
| 958 | |
| 959 | #define OPT_PID 500 |
| 960 | #define OPT_PPID 501 |
| 961 | #define OPT_RM_PIDFILE 502 |
| 962 | |
| 963 | static void |
| 964 | parse_options(int argc, char * const *argv) |
| 965 | { |
| 966 | static struct option longopts[] = { |
| 967 | { "help", 0, NULL, 'H'}, |
| 968 | { "stop", 0, NULL, 'K'}, |
| 969 | { "start", 0, NULL, 'S'}, |
| 970 | { "status", 0, NULL, 'T'}, |
| 971 | { "version", 0, NULL, 'V'}, |
| 972 | { "startas", 1, NULL, 'a'}, |
| 973 | { "name", 1, NULL, 'n'}, |
| 974 | { "oknodo", 0, NULL, 'o'}, |
| 975 | { "pid", 1, NULL, OPT_PID}, |
| 976 | { "ppid", 1, NULL, OPT_PPID}, |
| 977 | { "pidfile", 1, NULL, 'p'}, |
| 978 | { "quiet", 0, NULL, 'q'}, |
| 979 | { "signal", 1, NULL, 's'}, |
| 980 | { "test", 0, NULL, 't'}, |
| 981 | { "user", 1, NULL, 'u'}, |
| 982 | { "group", 1, NULL, 'g'}, |
| 983 | { "chroot", 1, NULL, 'r'}, |
| 984 | { "verbose", 0, NULL, 'v'}, |
| 985 | { "exec", 1, NULL, 'x'}, |
| 986 | { "chuid", 1, NULL, 'c'}, |
| 987 | { "nicelevel", 1, NULL, 'N'}, |
| 988 | { "procsched", 1, NULL, 'P'}, |
| 989 | { "iosched", 1, NULL, 'I'}, |
| 990 | { "umask", 1, NULL, 'k'}, |
| 991 | { "background", 0, NULL, 'b'}, |
| 992 | { "no-close", 0, NULL, 'C'}, |
| 993 | { "make-pidfile", 0, NULL, 'm'}, |
| 994 | { "remove-pidfile", 0, NULL, OPT_RM_PIDFILE}, |
| 995 | { "retry", 1, NULL, 'R'}, |
| 996 | { "chdir", 1, NULL, 'd'}, |
| 997 | { NULL, 0, NULL, 0 } |
| 998 | }; |
| 999 | const char *pid_str = NULL; |
| 1000 | const char *ppid_str = NULL; |
| 1001 | const char *umask_str = NULL; |
| 1002 | const char *signal_str = NULL; |
| 1003 | const char *schedule_str = NULL; |
| 1004 | const char *proc_schedule_str = NULL; |
| 1005 | const char *io_schedule_str = NULL; |
| 1006 | size_t changeuser_len; |
| 1007 | int c; |
| 1008 | |
| 1009 | for (;;) { |
| 1010 | c = getopt_long(argc, argv, |
| 1011 | "HKSVTa:n:op:qr:s:tu:vx:c:N:P:I:k:bCmR:g:d:", |
| 1012 | longopts, NULL); |
| 1013 | if (c == -1) |
| 1014 | break; |
| 1015 | switch (c) { |
| 1016 | case 'H': /* --help */ |
| 1017 | usage(); |
| 1018 | exit(0); |
| 1019 | case 'K': /* --stop */ |
| 1020 | set_action(ACTION_STOP); |
| 1021 | break; |
| 1022 | case 'S': /* --start */ |
| 1023 | set_action(ACTION_START); |
| 1024 | break; |
| 1025 | case 'T': /* --status */ |
| 1026 | set_action(ACTION_STATUS); |
| 1027 | break; |
| 1028 | case 'V': /* --version */ |
| 1029 | do_version(); |
| 1030 | exit(0); |
| 1031 | case 'a': /* --startas <pathname> */ |
| 1032 | startas = optarg; |
| 1033 | break; |
| 1034 | case 'n': /* --name <process-name> */ |
| 1035 | cmdname = optarg; |
| 1036 | break; |
| 1037 | case 'o': /* --oknodo */ |
| 1038 | exitnodo = 0; |
| 1039 | break; |
| 1040 | case OPT_PID: /* --pid <pid> */ |
| 1041 | pid_str = optarg; |
| 1042 | break; |
| 1043 | case OPT_PPID: /* --ppid <ppid> */ |
| 1044 | ppid_str = optarg; |
| 1045 | break; |
| 1046 | case 'p': /* --pidfile <pid-file> */ |
| 1047 | pidfile = optarg; |
| 1048 | break; |
| 1049 | case 'q': /* --quiet */ |
| 1050 | quietmode = true; |
| 1051 | break; |
| 1052 | case 's': /* --signal <signal> */ |
| 1053 | signal_str = optarg; |
| 1054 | break; |
| 1055 | case 't': /* --test */ |
| 1056 | testmode = true; |
| 1057 | break; |
| 1058 | case 'u': /* --user <username>|<uid> */ |
| 1059 | userspec = optarg; |
| 1060 | break; |
| 1061 | case 'v': /* --verbose */ |
| 1062 | quietmode = -1; |
| 1063 | break; |
| 1064 | case 'x': /* --exec <executable> */ |
| 1065 | execname = optarg; |
| 1066 | break; |
| 1067 | case 'c': /* --chuid <username>|<uid> */ |
| 1068 | /* We copy the string just in case we need the |
| 1069 | * argument later. */ |
| 1070 | changeuser_len = strcspn(optarg, ":"); |
| 1071 | changeuser = xstrndup(optarg, changeuser_len); |
| 1072 | if (optarg[changeuser_len] == ':') { |
| 1073 | if (optarg[changeuser_len + 1] == '\0') |
| 1074 | fatal("missing group name"); |
| 1075 | changegroup = optarg + changeuser_len + 1; |
| 1076 | } |
| 1077 | break; |
| 1078 | case 'g': /* --group <group>|<gid> */ |
| 1079 | changegroup = optarg; |
| 1080 | break; |
| 1081 | case 'r': /* --chroot /new/root */ |
| 1082 | changeroot = optarg; |
| 1083 | break; |
| 1084 | case 'N': /* --nice */ |
| 1085 | nicelevel = atoi(optarg); |
| 1086 | break; |
| 1087 | case 'P': /* --procsched */ |
| 1088 | proc_schedule_str = optarg; |
| 1089 | break; |
| 1090 | case 'I': /* --iosched */ |
| 1091 | io_schedule_str = optarg; |
| 1092 | break; |
| 1093 | case 'k': /* --umask <mask> */ |
| 1094 | umask_str = optarg; |
| 1095 | break; |
| 1096 | case 'b': /* --background */ |
| 1097 | background = true; |
| 1098 | break; |
| 1099 | case 'C': /* --no-close */ |
| 1100 | close_io = false; |
| 1101 | break; |
| 1102 | case 'm': /* --make-pidfile */ |
| 1103 | mpidfile = true; |
| 1104 | break; |
| 1105 | case OPT_RM_PIDFILE: /* --remove-pidfile */ |
| 1106 | rpidfile = true; |
| 1107 | break; |
| 1108 | case 'R': /* --retry <schedule>|<timeout> */ |
| 1109 | schedule_str = optarg; |
| 1110 | break; |
| 1111 | case 'd': /* --chdir /new/dir */ |
| 1112 | changedir = optarg; |
| 1113 | break; |
| 1114 | default: |
| 1115 | /* Message printed by getopt. */ |
| 1116 | badusage(NULL); |
| 1117 | } |
| 1118 | } |
| 1119 | |
| 1120 | if (pid_str != NULL) { |
| 1121 | if (parse_pid(pid_str, &match_pid) != 0) |
| 1122 | badusage("pid value must be a number greater than 0"); |
| 1123 | } |
| 1124 | |
| 1125 | if (ppid_str != NULL) { |
| 1126 | if (parse_pid(ppid_str, &match_ppid) != 0) |
| 1127 | badusage("ppid value must be a number greater than 0"); |
| 1128 | } |
| 1129 | |
| 1130 | if (signal_str != NULL) { |
| 1131 | if (parse_signal(signal_str, &signal_nr) != 0) |
| 1132 | badusage("signal value must be numeric or name" |
| 1133 | " of signal (KILL, INT, ...)"); |
| 1134 | } |
| 1135 | |
| 1136 | if (schedule_str != NULL) { |
| 1137 | parse_schedule(schedule_str); |
| 1138 | } |
| 1139 | |
| 1140 | if (proc_schedule_str != NULL) |
| 1141 | parse_proc_schedule(proc_schedule_str); |
| 1142 | |
| 1143 | if (io_schedule_str != NULL) |
| 1144 | parse_io_schedule(io_schedule_str); |
| 1145 | |
| 1146 | if (umask_str != NULL) { |
| 1147 | if (parse_umask(umask_str, &umask_value) != 0) |
| 1148 | badusage("umask value must be a positive number"); |
| 1149 | } |
| 1150 | |
| 1151 | if (action == ACTION_NONE) |
| 1152 | badusage("need one of --start or --stop or --status"); |
| 1153 | |
| 1154 | if (!execname && !pid_str && !ppid_str && !pidfile && !userspec && |
| 1155 | !cmdname) |
| 1156 | badusage("need at least one of --exec, --pid, --ppid, --pidfile, --user or --name"); |
| 1157 | |
| 1158 | #ifdef PROCESS_NAME_SIZE |
| 1159 | if (cmdname && strlen(cmdname) > PROCESS_NAME_SIZE) |
| 1160 | warning("this system is not able to track process names\n" |
| 1161 | "longer than %d characters, please use --exec " |
| 1162 | "instead of --name.\n", PROCESS_NAME_SIZE); |
| 1163 | #endif |
| 1164 | |
| 1165 | if (!startas) |
| 1166 | startas = execname; |
| 1167 | |
| 1168 | if (action == ACTION_START && !startas) |
| 1169 | badusage("--start needs --exec or --startas"); |
| 1170 | |
| 1171 | if (mpidfile && pidfile == NULL) |
| 1172 | badusage("--make-pidfile requires --pidfile"); |
| 1173 | if (rpidfile && pidfile == NULL) |
| 1174 | badusage("--remove-pidfile requires --pidfile"); |
| 1175 | |
| 1176 | if (pid_str && pidfile) |
| 1177 | badusage("need either --pid of --pidfile, not both"); |
| 1178 | |
| 1179 | if (background && action != ACTION_START) |
| 1180 | badusage("--background is only relevant with --start"); |
| 1181 | |
| 1182 | if (!close_io && !background) |
| 1183 | badusage("--no-close is only relevant with --background"); |
| 1184 | } |
| 1185 | |
| 1186 | static void |
| 1187 | setup_options(void) |
| 1188 | { |
| 1189 | if (execname) { |
| 1190 | char *fullexecname; |
| 1191 | |
| 1192 | /* If it's a relative path, normalize it. */ |
| 1193 | if (execname[0] != '/') |
| 1194 | execname = newpath(changedir, execname); |
| 1195 | |
| 1196 | if (changeroot) |
| 1197 | fullexecname = newpath(changeroot, execname); |
| 1198 | else |
| 1199 | fullexecname = execname; |
| 1200 | |
| 1201 | if (stat(fullexecname, &exec_stat)) |
| 1202 | fatal("unable to stat %s", fullexecname); |
| 1203 | |
| 1204 | if (fullexecname != execname) |
| 1205 | free(fullexecname); |
| 1206 | } |
| 1207 | |
| 1208 | if (userspec && parse_unsigned(userspec, 10, &user_id) < 0) { |
| 1209 | struct passwd *pw; |
| 1210 | |
| 1211 | pw = getpwnam(userspec); |
| 1212 | if (!pw) |
| 1213 | fatal("user '%s' not found", userspec); |
| 1214 | |
| 1215 | user_id = pw->pw_uid; |
| 1216 | } |
| 1217 | |
| 1218 | if (changegroup && parse_unsigned(changegroup, 10, &runas_gid) < 0) { |
| 1219 | struct group *gr; |
| 1220 | |
| 1221 | gr = getgrnam(changegroup); |
| 1222 | if (!gr) |
| 1223 | fatal("group '%s' not found", changegroup); |
| 1224 | changegroup = gr->gr_name; |
| 1225 | runas_gid = gr->gr_gid; |
| 1226 | } |
| 1227 | if (changeuser) { |
| 1228 | struct passwd *pw; |
| 1229 | struct stat st; |
| 1230 | |
| 1231 | if (parse_unsigned(changeuser, 10, &runas_uid) == 0) |
| 1232 | pw = getpwuid(runas_uid); |
| 1233 | else |
| 1234 | pw = getpwnam(changeuser); |
| 1235 | if (!pw) |
| 1236 | fatal("user '%s' not found", changeuser); |
| 1237 | changeuser = pw->pw_name; |
| 1238 | runas_uid = pw->pw_uid; |
| 1239 | if (changegroup == NULL) { |
| 1240 | /* Pass the default group of this user. */ |
| 1241 | changegroup = ""; /* Just empty. */ |
| 1242 | runas_gid = pw->pw_gid; |
| 1243 | } |
| 1244 | if (stat(pw->pw_dir, &st) == 0) |
| 1245 | setenv("HOME", pw->pw_dir, 1); |
| 1246 | } |
| 1247 | } |
| 1248 | |
| 1249 | #if defined(OS_Linux) |
| 1250 | static const char * |
| 1251 | proc_status_field(pid_t pid, const char *field) |
| 1252 | { |
| 1253 | static char *line = NULL; |
| 1254 | static size_t line_size = 0; |
| 1255 | |
| 1256 | FILE *fp; |
| 1257 | char filename[32]; |
| 1258 | char *value = NULL; |
| 1259 | ssize_t line_len; |
| 1260 | size_t field_len = strlen(field); |
| 1261 | |
| 1262 | sprintf(filename, "/proc/%d/status", pid); |
| 1263 | fp = fopen(filename, "r"); |
| 1264 | if (!fp) |
| 1265 | return NULL; |
| 1266 | while ((line_len = getline(&line, &line_size, fp)) >= 0) { |
| 1267 | if (strncasecmp(line, field, field_len) == 0) { |
| 1268 | line[line_len - 1] = '\0'; |
| 1269 | |
| 1270 | value = line + field_len; |
| 1271 | while (isspace(*value)) |
| 1272 | value++; |
| 1273 | |
| 1274 | break; |
| 1275 | } |
| 1276 | } |
| 1277 | fclose(fp); |
| 1278 | |
| 1279 | return value; |
| 1280 | } |
| 1281 | #elif defined(OS_AIX) |
| 1282 | static bool |
| 1283 | proc_get_psinfo(pid_t pid, struct psinfo *psinfo) |
| 1284 | { |
| 1285 | char filename[64]; |
| 1286 | FILE *fp; |
| 1287 | |
| 1288 | sprintf(filename, "/proc/%d/psinfo", pid); |
| 1289 | fp = fopen(filename, "r"); |
| 1290 | if (!fp) |
| 1291 | return false; |
| 1292 | if (fread(psinfo, sizeof(*psinfo), 1, fp) == 0) |
| 1293 | return false; |
| 1294 | if (ferror(fp)) |
| 1295 | return false; |
| 1296 | |
| 1297 | return true; |
| 1298 | } |
| 1299 | #elif defined(OS_Hurd) |
| 1300 | static void |
| 1301 | init_procset(void) |
| 1302 | { |
| 1303 | struct ps_context *context; |
| 1304 | error_t err; |
| 1305 | |
| 1306 | err = ps_context_create(getproc(), &context); |
| 1307 | if (err) |
| 1308 | error(1, err, "ps_context_create"); |
| 1309 | |
| 1310 | err = proc_stat_list_create(context, &procset); |
| 1311 | if (err) |
| 1312 | error(1, err, "proc_stat_list_create"); |
| 1313 | |
| 1314 | err = proc_stat_list_add_all(procset, 0, 0); |
| 1315 | if (err) |
| 1316 | error(1, err, "proc_stat_list_add_all"); |
| 1317 | } |
| 1318 | |
| 1319 | static struct proc_stat * |
| 1320 | get_proc_stat(pid_t pid, ps_flags_t flags) |
| 1321 | { |
| 1322 | struct proc_stat *ps; |
| 1323 | ps_flags_t wanted_flags = PSTAT_PID | flags; |
| 1324 | |
| 1325 | if (!procset) |
| 1326 | init_procset(); |
| 1327 | |
| 1328 | ps = proc_stat_list_pid_proc_stat(procset, pid); |
| 1329 | if (!ps) |
| 1330 | return NULL; |
| 1331 | if (proc_stat_set_flags(ps, wanted_flags)) |
| 1332 | return NULL; |
| 1333 | if ((proc_stat_flags(ps) & wanted_flags) != wanted_flags) |
| 1334 | return NULL; |
| 1335 | |
| 1336 | return ps; |
| 1337 | } |
| 1338 | #elif defined(HAVE_KVM_H) |
| 1339 | static kvm_t * |
| 1340 | ssd_kvm_open(void) |
| 1341 | { |
| 1342 | kvm_t *kd; |
| 1343 | char errbuf[_POSIX2_LINE_MAX]; |
| 1344 | |
| 1345 | kd = kvm_openfiles(NULL, KVM_MEMFILE, NULL, O_RDONLY, errbuf); |
| 1346 | if (kd == NULL) |
| 1347 | errx(1, "%s", errbuf); |
| 1348 | |
| 1349 | return kd; |
| 1350 | } |
| 1351 | |
| 1352 | static struct kinfo_proc * |
| 1353 | ssd_kvm_get_procs(kvm_t *kd, int op, int arg, int *count) |
| 1354 | { |
| 1355 | struct kinfo_proc *kp; |
| 1356 | int lcount; |
| 1357 | |
| 1358 | if (count == NULL) |
| 1359 | count = &lcount; |
| 1360 | *count = 0; |
| 1361 | |
| 1362 | #if defined(OS_OpenBSD) |
| 1363 | kp = kvm_getprocs(kd, op, arg, sizeof(*kp), count); |
| 1364 | #else |
| 1365 | kp = kvm_getprocs(kd, op, arg, count); |
| 1366 | #endif |
| 1367 | if (kp == NULL && errno != ESRCH) |
| 1368 | errx(1, "%s", kvm_geterr(kd)); |
| 1369 | |
| 1370 | return kp; |
| 1371 | } |
| 1372 | #endif |
| 1373 | |
| 1374 | #if defined(OS_Linux) |
| 1375 | static bool |
| 1376 | pid_is_exec(pid_t pid, const struct stat *esb) |
| 1377 | { |
| 1378 | char lname[32]; |
| 1379 | char lcontents[_POSIX_PATH_MAX + 1]; |
| 1380 | char *filename; |
| 1381 | const char deleted[] = " (deleted)"; |
| 1382 | int nread; |
| 1383 | struct stat sb; |
| 1384 | |
| 1385 | sprintf(lname, "/proc/%d/exe", pid); |
| 1386 | nread = readlink(lname, lcontents, sizeof(lcontents) - 1); |
| 1387 | if (nread == -1) |
| 1388 | return false; |
| 1389 | |
| 1390 | filename = lcontents; |
| 1391 | filename[nread] = '\0'; |
| 1392 | |
| 1393 | /* OpenVZ kernels contain a bogus patch that instead of appending, |
| 1394 | * prepends the deleted marker. Workaround those. Otherwise handle |
| 1395 | * the normal appended marker. */ |
| 1396 | if (strncmp(filename, deleted, strlen(deleted)) == 0) |
| 1397 | filename += strlen(deleted); |
| 1398 | else if (strcmp(filename + nread - strlen(deleted), deleted) == 0) |
| 1399 | filename[nread - strlen(deleted)] = '\0'; |
| 1400 | |
| 1401 | if (stat(filename, &sb) != 0) |
| 1402 | return false; |
| 1403 | |
| 1404 | return (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino); |
| 1405 | } |
| 1406 | #elif defined(OS_AIX) |
| 1407 | static bool |
| 1408 | pid_is_exec(pid_t pid, const struct stat *esb) |
| 1409 | { |
| 1410 | struct stat sb; |
| 1411 | char filename[64]; |
| 1412 | |
| 1413 | sprintf(filename, "/proc/%d/object/a.out", pid); |
| 1414 | |
| 1415 | if (stat(filename, &sb) != 0) |
| 1416 | return false; |
| 1417 | |
| 1418 | return sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino; |
| 1419 | } |
| 1420 | #elif defined(OS_Hurd) |
| 1421 | static bool |
| 1422 | pid_is_exec(pid_t pid, const struct stat *esb) |
| 1423 | { |
| 1424 | struct proc_stat *ps; |
| 1425 | struct stat sb; |
| 1426 | const char *filename; |
| 1427 | |
| 1428 | ps = get_proc_stat(pid, PSTAT_ARGS); |
| 1429 | if (ps == NULL) |
| 1430 | return false; |
| 1431 | |
| 1432 | /* On old Hurd systems we have to use the argv[0] value, because |
| 1433 | * there is nothing better. */ |
| 1434 | filename = proc_stat_args(ps); |
| 1435 | #ifdef PSTAT_EXE |
| 1436 | /* On new Hurd systems we can use the correct value, as long |
| 1437 | * as it's not NULL nor empty, as it was the case on the first |
| 1438 | * implementation. */ |
| 1439 | if (proc_stat_set_flags(ps, PSTAT_EXE) == 0 && |
| 1440 | proc_stat_flags(ps) & PSTAT_EXE && |
| 1441 | proc_stat_exe(ps) != NULL && |
| 1442 | proc_stat_exe(ps)[0] != '\0') |
| 1443 | filename = proc_stat_exe(ps); |
| 1444 | #endif |
| 1445 | |
| 1446 | if (stat(filename, &sb) != 0) |
| 1447 | return false; |
| 1448 | |
| 1449 | return (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino); |
| 1450 | } |
| 1451 | #elif defined(OS_Darwin) |
| 1452 | static bool |
| 1453 | pid_is_exec(pid_t pid, const struct stat *esb) |
| 1454 | { |
| 1455 | struct stat sb; |
| 1456 | char pathname[_POSIX_PATH_MAX]; |
| 1457 | |
| 1458 | if (proc_pidpath(pid, pathname, sizeof(pathname)) < 0) |
| 1459 | return false; |
| 1460 | |
| 1461 | if (stat(pathname, &sb) != 0) |
| 1462 | return false; |
| 1463 | |
| 1464 | return (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino); |
| 1465 | } |
| 1466 | #elif defined(OS_HPUX) |
| 1467 | static bool |
| 1468 | pid_is_exec(pid_t pid, const struct stat *esb) |
| 1469 | { |
| 1470 | struct pst_status pst; |
| 1471 | |
| 1472 | if (pstat_getproc(&pst, sizeof(pst), (size_t)0, (int)pid) < 0) |
| 1473 | return false; |
| 1474 | return ((dev_t)pst.pst_text.psf_fsid.psfs_id == esb->st_dev && |
| 1475 | (ino_t)pst.pst_text.psf_fileid == esb->st_ino); |
| 1476 | } |
| 1477 | #elif defined(OS_FreeBSD) |
| 1478 | static bool |
| 1479 | pid_is_exec(pid_t pid, const struct stat *esb) |
| 1480 | { |
| 1481 | struct stat sb; |
| 1482 | int error, mib[4]; |
| 1483 | size_t len; |
| 1484 | char pathname[PATH_MAX]; |
| 1485 | |
| 1486 | mib[0] = CTL_KERN; |
| 1487 | mib[1] = KERN_PROC; |
| 1488 | mib[2] = KERN_PROC_PATHNAME; |
| 1489 | mib[3] = pid; |
| 1490 | len = sizeof(pathname); |
| 1491 | |
| 1492 | error = sysctl(mib, 4, pathname, &len, NULL, 0); |
| 1493 | if (error != 0 && errno != ESRCH) |
| 1494 | return false; |
| 1495 | if (len == 0) |
| 1496 | pathname[0] = '\0'; |
| 1497 | |
| 1498 | if (stat(pathname, &sb) != 0) |
| 1499 | return false; |
| 1500 | |
| 1501 | return (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino); |
| 1502 | } |
| 1503 | #elif defined(HAVE_KVM_H) |
| 1504 | static bool |
| 1505 | pid_is_exec(pid_t pid, const struct stat *esb) |
| 1506 | { |
| 1507 | kvm_t *kd; |
| 1508 | int argv_len = 0; |
| 1509 | struct kinfo_proc *kp; |
| 1510 | struct stat sb; |
| 1511 | char buf[_POSIX2_LINE_MAX]; |
| 1512 | char **pid_argv_p; |
| 1513 | char *start_argv_0_p, *end_argv_0_p; |
| 1514 | bool res = false; |
| 1515 | |
| 1516 | kd = ssd_kvm_open(); |
| 1517 | kp = ssd_kvm_get_procs(kd, KERN_PROC_PID, pid, NULL); |
| 1518 | if (kp == NULL) |
| 1519 | goto cleanup; |
| 1520 | |
| 1521 | pid_argv_p = kvm_getargv(kd, kp, argv_len); |
| 1522 | if (pid_argv_p == NULL) |
| 1523 | errx(1, "%s", kvm_geterr(kd)); |
| 1524 | |
| 1525 | /* Find and compare string. */ |
| 1526 | start_argv_0_p = *pid_argv_p; |
| 1527 | |
| 1528 | /* Find end of argv[0] then copy and cut of str there. */ |
| 1529 | end_argv_0_p = strchr(*pid_argv_p, ' '); |
| 1530 | if (end_argv_0_p == NULL) |
| 1531 | /* There seems to be no space, so we have the command |
| 1532 | * already in its desired form. */ |
| 1533 | start_argv_0_p = *pid_argv_p; |
| 1534 | else { |
| 1535 | /* Tests indicate that this never happens, since |
| 1536 | * kvm_getargv itself cuts of tailing stuff. This is |
| 1537 | * not what the manpage says, however. */ |
| 1538 | strncpy(buf, *pid_argv_p, (end_argv_0_p - start_argv_0_p)); |
| 1539 | buf[(end_argv_0_p - start_argv_0_p) + 1] = '\0'; |
| 1540 | start_argv_0_p = buf; |
| 1541 | } |
| 1542 | |
| 1543 | if (stat(start_argv_0_p, &sb) != 0) |
| 1544 | goto cleanup; |
| 1545 | |
| 1546 | res = (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino); |
| 1547 | |
| 1548 | cleanup: |
| 1549 | kvm_close(kd); |
| 1550 | |
| 1551 | return res; |
| 1552 | } |
| 1553 | #endif |
| 1554 | |
| 1555 | #if defined(OS_Linux) |
| 1556 | static bool |
| 1557 | pid_is_child(pid_t pid, pid_t ppid) |
| 1558 | { |
| 1559 | const char *ppid_str; |
| 1560 | pid_t proc_ppid; |
| 1561 | int rc; |
| 1562 | |
| 1563 | ppid_str = proc_status_field(pid, "PPid:"); |
| 1564 | if (ppid_str == NULL) |
| 1565 | return false; |
| 1566 | |
| 1567 | rc = parse_pid(ppid_str, &proc_ppid); |
| 1568 | if (rc < 0) |
| 1569 | return false; |
| 1570 | |
| 1571 | return proc_ppid == ppid; |
| 1572 | } |
| 1573 | #elif defined(OS_Hurd) |
| 1574 | static bool |
| 1575 | pid_is_child(pid_t pid, pid_t ppid) |
| 1576 | { |
| 1577 | struct proc_stat *ps; |
| 1578 | struct procinfo *pi; |
| 1579 | |
| 1580 | ps = get_proc_stat(pid, PSTAT_PROC_INFO); |
| 1581 | if (ps == NULL) |
| 1582 | return false; |
| 1583 | |
| 1584 | pi = proc_stat_proc_info(ps); |
| 1585 | |
| 1586 | return pi->ppid == ppid; |
| 1587 | } |
| 1588 | #elif defined(OS_Darwin) |
| 1589 | static bool |
| 1590 | pid_is_child(pid_t pid, pid_t ppid) |
| 1591 | { |
| 1592 | struct proc_bsdinfo info; |
| 1593 | |
| 1594 | if (proc_pidinfo(pid, PROC_PIDTBSDINFO, 0, &info, sizeof(info)) < 0) |
| 1595 | return false; |
| 1596 | |
| 1597 | return (pid_t)info.pbi_ppid == ppid; |
| 1598 | } |
| 1599 | #elif defined(OS_AIX) |
| 1600 | static bool |
| 1601 | pid_is_child(pid_t pid, pid_t ppid) |
| 1602 | { |
| 1603 | struct psinfo psi; |
| 1604 | |
| 1605 | if (!proc_get_psinfo(pid, &psi)) |
| 1606 | return false; |
| 1607 | |
| 1608 | return (pid_t)psi.pr_ppid == ppid; |
| 1609 | } |
| 1610 | #elif defined(OS_HPUX) |
| 1611 | static bool |
| 1612 | pid_is_child(pid_t pid, pid_t ppid) |
| 1613 | { |
| 1614 | struct pst_status pst; |
| 1615 | |
| 1616 | if (pstat_getproc(&pst, sizeof(pst), (size_t)0, (int)pid) < 0) |
| 1617 | return false; |
| 1618 | |
| 1619 | return pst.pst_ppid == ppid; |
| 1620 | } |
| 1621 | #elif defined(OS_FreeBSD) |
| 1622 | static bool |
| 1623 | pid_is_child(pid_t pid, pid_t ppid) |
| 1624 | { |
| 1625 | struct kinfo_proc kp; |
| 1626 | int rc, mib[4]; |
| 1627 | size_t len; |
| 1628 | |
| 1629 | mib[0] = CTL_KERN; |
| 1630 | mib[1] = KERN_PROC; |
| 1631 | mib[2] = KERN_PROC_PID; |
| 1632 | mib[3] = pid; |
| 1633 | len = sizeof(kp); |
| 1634 | |
| 1635 | rc = sysctl(mib, 4, &kp, &len, NULL, 0); |
| 1636 | if (rc != 0 && errno != ESRCH) |
| 1637 | return false; |
| 1638 | if (len == 0 || len != sizeof(kp)) |
| 1639 | return false; |
| 1640 | |
| 1641 | return kp.ki_ppid == ppid; |
| 1642 | } |
| 1643 | #elif defined(HAVE_KVM_H) |
| 1644 | static bool |
| 1645 | pid_is_child(pid_t pid, pid_t ppid) |
| 1646 | { |
| 1647 | kvm_t *kd; |
| 1648 | struct kinfo_proc *kp; |
| 1649 | pid_t proc_ppid; |
| 1650 | bool res = false; |
| 1651 | |
| 1652 | kd = ssd_kvm_open(); |
| 1653 | kp = ssd_kvm_get_procs(kd, KERN_PROC_PID, pid, NULL); |
| 1654 | if (kp == NULL) |
| 1655 | goto cleanup; |
| 1656 | |
| 1657 | #if defined(OS_FreeBSD) |
| 1658 | proc_ppid = kp->ki_ppid; |
| 1659 | #elif defined(OS_OpenBSD) |
| 1660 | proc_ppid = kp->p_ppid; |
| 1661 | #elif defined(OS_DragonFlyBSD) |
| 1662 | proc_ppid = kp->kp_ppid; |
| 1663 | #else |
| 1664 | proc_ppid = kp->kp_proc.p_ppid; |
| 1665 | #endif |
| 1666 | |
| 1667 | res = (proc_ppid == ppid); |
| 1668 | |
| 1669 | cleanup: |
| 1670 | kvm_close(kd); |
| 1671 | |
| 1672 | return res; |
| 1673 | } |
| 1674 | #endif |
| 1675 | |
| 1676 | #if defined(OS_Linux) |
| 1677 | static bool |
| 1678 | pid_is_user(pid_t pid, uid_t uid) |
| 1679 | { |
| 1680 | struct stat sb; |
| 1681 | char buf[32]; |
| 1682 | |
| 1683 | sprintf(buf, "/proc/%d", pid); |
| 1684 | if (stat(buf, &sb) != 0) |
| 1685 | return false; |
| 1686 | return (sb.st_uid == uid); |
| 1687 | } |
| 1688 | #elif defined(OS_Hurd) |
| 1689 | static bool |
| 1690 | pid_is_user(pid_t pid, uid_t uid) |
| 1691 | { |
| 1692 | struct proc_stat *ps; |
| 1693 | |
| 1694 | ps = get_proc_stat(pid, PSTAT_OWNER_UID); |
| 1695 | return ps && (uid_t)proc_stat_owner_uid(ps) == uid; |
| 1696 | } |
| 1697 | #elif defined(OS_Darwin) |
| 1698 | static bool |
| 1699 | pid_is_user(pid_t pid, uid_t uid) |
| 1700 | { |
| 1701 | struct proc_bsdinfo info; |
| 1702 | |
| 1703 | if (proc_pidinfo(pid, PROC_PIDTBSDINFO, 0, &info, sizeof(info)) < 0) |
| 1704 | return false; |
| 1705 | |
| 1706 | return info.pbi_ruid == uid; |
| 1707 | } |
| 1708 | #elif defined(OS_AIX) |
| 1709 | static bool |
| 1710 | pid_is_user(pid_t pid, uid_t uid) |
| 1711 | { |
| 1712 | struct psinfo psi; |
| 1713 | |
| 1714 | if (!proc_get_psinfo(pid, &psi)) |
| 1715 | return false; |
| 1716 | |
| 1717 | return psi.pr_uid == uid; |
| 1718 | } |
| 1719 | #elif defined(OS_HPUX) |
| 1720 | static bool |
| 1721 | pid_is_user(pid_t pid, uid_t uid) |
| 1722 | { |
| 1723 | struct pst_status pst; |
| 1724 | |
| 1725 | if (pstat_getproc(&pst, sizeof(pst), (size_t)0, (int)pid) < 0) |
| 1726 | return false; |
| 1727 | return ((uid_t)pst.pst_uid == uid); |
| 1728 | } |
| 1729 | #elif defined(OS_FreeBSD) |
| 1730 | static bool |
| 1731 | pid_is_user(pid_t pid, uid_t uid) |
| 1732 | { |
| 1733 | struct kinfo_proc kp; |
| 1734 | int rc, mib[4]; |
| 1735 | size_t len; |
| 1736 | |
| 1737 | mib[0] = CTL_KERN; |
| 1738 | mib[1] = KERN_PROC; |
| 1739 | mib[2] = KERN_PROC_PID; |
| 1740 | mib[3] = pid; |
| 1741 | len = sizeof(kp); |
| 1742 | |
| 1743 | rc = sysctl(mib, 4, &kp, &len, NULL, 0); |
| 1744 | if (rc != 0 && errno != ESRCH) |
| 1745 | return false; |
| 1746 | if (len == 0 || len != sizeof(kp)) |
| 1747 | return false; |
| 1748 | |
| 1749 | return kp.ki_ruid == uid; |
| 1750 | } |
| 1751 | #elif defined(HAVE_KVM_H) |
| 1752 | static bool |
| 1753 | pid_is_user(pid_t pid, uid_t uid) |
| 1754 | { |
| 1755 | kvm_t *kd; |
| 1756 | uid_t proc_uid; |
| 1757 | struct kinfo_proc *kp; |
| 1758 | bool res = false; |
| 1759 | |
| 1760 | kd = ssd_kvm_open(); |
| 1761 | kp = ssd_kvm_get_procs(kd, KERN_PROC_PID, pid, NULL); |
| 1762 | if (kp == NULL) |
| 1763 | goto cleanup; |
| 1764 | |
| 1765 | #if defined(OS_FreeBSD) |
| 1766 | proc_uid = kp->ki_ruid; |
| 1767 | #elif defined(OS_OpenBSD) |
| 1768 | proc_uid = kp->p_ruid; |
| 1769 | #elif defined(OS_DragonFlyBSD) |
| 1770 | proc_uid = kp->kp_ruid; |
| 1771 | #elif defined(OS_NetBSD) |
| 1772 | proc_uid = kp->kp_eproc.e_pcred.p_ruid; |
| 1773 | #else |
| 1774 | if (kp->kp_proc.p_cred) |
| 1775 | kvm_read(kd, (u_long)&(kp->kp_proc.p_cred->p_ruid), |
| 1776 | &proc_uid, sizeof(uid_t)); |
| 1777 | else |
| 1778 | goto cleanup; |
| 1779 | #endif |
| 1780 | |
| 1781 | res = (proc_uid == (uid_t)uid); |
| 1782 | |
| 1783 | cleanup: |
| 1784 | kvm_close(kd); |
| 1785 | |
| 1786 | return res; |
| 1787 | } |
| 1788 | #endif |
| 1789 | |
| 1790 | #if defined(OS_Linux) |
| 1791 | static bool |
| 1792 | pid_is_cmd(pid_t pid, const char *name) |
| 1793 | { |
| 1794 | const char *comm; |
| 1795 | |
| 1796 | comm = proc_status_field(pid, "Name:"); |
| 1797 | if (comm == NULL) |
| 1798 | return false; |
| 1799 | |
| 1800 | return strcmp(comm, name) == 0; |
| 1801 | } |
| 1802 | #elif defined(OS_Hurd) |
| 1803 | static bool |
| 1804 | pid_is_cmd(pid_t pid, const char *name) |
| 1805 | { |
| 1806 | struct proc_stat *ps; |
| 1807 | size_t argv0_len; |
| 1808 | const char *argv0; |
| 1809 | const char *binary_name; |
| 1810 | |
| 1811 | ps = get_proc_stat(pid, PSTAT_ARGS); |
| 1812 | if (ps == NULL) |
| 1813 | return false; |
| 1814 | |
| 1815 | argv0 = proc_stat_args(ps); |
| 1816 | argv0_len = strlen(argv0) + 1; |
| 1817 | |
| 1818 | binary_name = basename(argv0); |
| 1819 | if (strcmp(binary_name, name) == 0) |
| 1820 | return true; |
| 1821 | |
| 1822 | /* XXX: This is all kinds of ugly, but on the Hurd there's no way to |
| 1823 | * know the command name of a process, so we have to try to match |
| 1824 | * also on argv[1] for the case of an interpreted script. */ |
| 1825 | if (proc_stat_args_len(ps) > argv0_len) { |
| 1826 | const char *script_name = basename(argv0 + argv0_len); |
| 1827 | |
| 1828 | return strcmp(script_name, name) == 0; |
| 1829 | } |
| 1830 | |
| 1831 | return false; |
| 1832 | } |
| 1833 | #elif defined(OS_AIX) |
| 1834 | static bool |
| 1835 | pid_is_cmd(pid_t pid, const char *name) |
| 1836 | { |
| 1837 | struct psinfo psi; |
| 1838 | |
| 1839 | if (!proc_get_psinfo(pid, &psi)) |
| 1840 | return false; |
| 1841 | |
| 1842 | return strcmp(psi.pr_fname, name) == 0; |
| 1843 | } |
| 1844 | #elif defined(OS_HPUX) |
| 1845 | static bool |
| 1846 | pid_is_cmd(pid_t pid, const char *name) |
| 1847 | { |
| 1848 | struct pst_status pst; |
| 1849 | |
| 1850 | if (pstat_getproc(&pst, sizeof(pst), (size_t)0, (int)pid) < 0) |
| 1851 | return false; |
| 1852 | return (strcmp(pst.pst_ucomm, name) == 0); |
| 1853 | } |
| 1854 | #elif defined(OS_Darwin) |
| 1855 | static bool |
| 1856 | pid_is_cmd(pid_t pid, const char *name) |
| 1857 | { |
| 1858 | char pathname[_POSIX_PATH_MAX]; |
| 1859 | |
| 1860 | if (proc_pidpath(pid, pathname, sizeof(pathname)) < 0) |
| 1861 | return false; |
| 1862 | |
| 1863 | return strcmp(pathname, name) == 0; |
| 1864 | } |
| 1865 | #elif defined(OS_FreeBSD) |
| 1866 | static bool |
| 1867 | pid_is_cmd(pid_t pid, const char *name) |
| 1868 | { |
| 1869 | struct kinfo_proc kp; |
| 1870 | int rc, mib[4]; |
| 1871 | size_t len; |
| 1872 | |
| 1873 | mib[0] = CTL_KERN; |
| 1874 | mib[1] = KERN_PROC; |
| 1875 | mib[2] = KERN_PROC_PID; |
| 1876 | mib[3] = pid; |
| 1877 | len = sizeof(kp); |
| 1878 | |
| 1879 | rc = sysctl(mib, 4, &kp, &len, NULL, 0); |
| 1880 | if (rc != 0 && errno != ESRCH) |
| 1881 | return false; |
| 1882 | if (len == 0 || len != sizeof(kp)) |
| 1883 | return false; |
| 1884 | |
| 1885 | return strcmp(kp.ki_comm, name) == 0; |
| 1886 | } |
| 1887 | #elif defined(HAVE_KVM_H) |
| 1888 | static bool |
| 1889 | pid_is_cmd(pid_t pid, const char *name) |
| 1890 | { |
| 1891 | kvm_t *kd; |
| 1892 | struct kinfo_proc *kp; |
| 1893 | char *process_name; |
| 1894 | bool res = false; |
| 1895 | |
| 1896 | kd = ssd_kvm_open(); |
| 1897 | kp = ssd_kvm_get_procs(kd, KERN_PROC_PID, pid, NULL); |
| 1898 | if (kp == NULL) |
| 1899 | goto cleanup; |
| 1900 | |
| 1901 | #if defined(OS_FreeBSD) |
| 1902 | process_name = kp->ki_comm; |
| 1903 | #elif defined(OS_OpenBSD) |
| 1904 | process_name = kp->p_comm; |
| 1905 | #elif defined(OS_DragonFlyBSD) |
| 1906 | process_name = kp->kp_comm; |
| 1907 | #else |
| 1908 | process_name = kp->kp_proc.p_comm; |
| 1909 | #endif |
| 1910 | |
| 1911 | res = (strcmp(name, process_name) == 0); |
| 1912 | |
| 1913 | cleanup: |
| 1914 | kvm_close(kd); |
| 1915 | |
| 1916 | return res; |
| 1917 | } |
| 1918 | #endif |
| 1919 | |
| 1920 | #if defined(OS_Hurd) |
| 1921 | static bool |
| 1922 | pid_is_running(pid_t pid) |
| 1923 | { |
| 1924 | return get_proc_stat(pid, 0) != NULL; |
| 1925 | } |
| 1926 | #else /* !OS_Hurd */ |
| 1927 | static bool |
| 1928 | pid_is_running(pid_t pid) |
| 1929 | { |
| 1930 | if (kill(pid, 0) == 0 || errno == EPERM) |
| 1931 | return true; |
| 1932 | else if (errno == ESRCH) |
| 1933 | return false; |
| 1934 | else |
| 1935 | fatal("error checking pid %u status", pid); |
| 1936 | } |
| 1937 | #endif |
| 1938 | |
| 1939 | static enum status_code |
| 1940 | pid_check(pid_t pid) |
| 1941 | { |
| 1942 | if (execname && !pid_is_exec(pid, &exec_stat)) |
| 1943 | return STATUS_DEAD; |
| 1944 | if (match_ppid > 0 && !pid_is_child(pid, match_ppid)) |
| 1945 | return STATUS_DEAD; |
| 1946 | if (userspec && !pid_is_user(pid, user_id)) |
| 1947 | return STATUS_DEAD; |
| 1948 | if (cmdname && !pid_is_cmd(pid, cmdname)) |
| 1949 | return STATUS_DEAD; |
| 1950 | if (action != ACTION_STOP && !pid_is_running(pid)) |
| 1951 | return STATUS_DEAD; |
| 1952 | |
| 1953 | pid_list_push(&found, pid); |
| 1954 | |
| 1955 | return STATUS_OK; |
| 1956 | } |
| 1957 | |
| 1958 | static enum status_code |
| 1959 | do_pidfile(const char *name) |
| 1960 | { |
| 1961 | FILE *f; |
| 1962 | static pid_t pid = 0; |
| 1963 | |
| 1964 | if (pid) |
| 1965 | return pid_check(pid); |
| 1966 | |
| 1967 | f = fopen(name, "r"); |
| 1968 | if (f) { |
| 1969 | enum status_code pid_status; |
| 1970 | |
| 1971 | if (fscanf(f, "%d", &pid) == 1) |
| 1972 | pid_status = pid_check(pid); |
| 1973 | else |
| 1974 | pid_status = STATUS_UNKNOWN; |
| 1975 | fclose(f); |
| 1976 | |
| 1977 | if (pid_status == STATUS_DEAD) |
| 1978 | return STATUS_DEAD_PIDFILE; |
| 1979 | else |
| 1980 | return pid_status; |
| 1981 | } else if (errno == ENOENT) |
| 1982 | return STATUS_DEAD; |
| 1983 | else |
| 1984 | fatal("unable to open pidfile %s", name); |
| 1985 | } |
| 1986 | |
| 1987 | #if defined(OS_Linux) || defined(OS_Solaris) || defined(OS_AIX) |
| 1988 | static enum status_code |
| 1989 | do_procinit(void) |
| 1990 | { |
| 1991 | DIR *procdir; |
| 1992 | struct dirent *entry; |
| 1993 | int foundany; |
| 1994 | pid_t pid; |
| 1995 | enum status_code prog_status = STATUS_DEAD; |
| 1996 | |
| 1997 | procdir = opendir("/proc"); |
| 1998 | if (!procdir) |
| 1999 | fatal("unable to opendir /proc"); |
| 2000 | |
| 2001 | foundany = 0; |
| 2002 | while ((entry = readdir(procdir)) != NULL) { |
| 2003 | enum status_code pid_status; |
| 2004 | |
| 2005 | if (sscanf(entry->d_name, "%d", &pid) != 1) |
| 2006 | continue; |
| 2007 | foundany++; |
| 2008 | |
| 2009 | pid_status = pid_check(pid); |
| 2010 | if (pid_status < prog_status) |
| 2011 | prog_status = pid_status; |
| 2012 | } |
| 2013 | closedir(procdir); |
| 2014 | if (!foundany) |
| 2015 | fatal("nothing in /proc - not mounted?"); |
| 2016 | |
| 2017 | return prog_status; |
| 2018 | } |
| 2019 | #elif defined(OS_Hurd) |
| 2020 | static int |
| 2021 | check_proc_stat(struct proc_stat *ps) |
| 2022 | { |
| 2023 | pid_check(proc_stat_pid(ps)); |
| 2024 | return 0; |
| 2025 | } |
| 2026 | |
| 2027 | static enum status_code |
| 2028 | do_procinit(void) |
| 2029 | { |
| 2030 | if (!procset) |
| 2031 | init_procset(); |
| 2032 | |
| 2033 | proc_stat_list_for_each(procset, check_proc_stat); |
| 2034 | |
| 2035 | if (found) |
| 2036 | return STATUS_OK; |
| 2037 | else |
| 2038 | return STATUS_DEAD; |
| 2039 | } |
| 2040 | #elif defined(OS_Darwin) |
| 2041 | static enum status_code |
| 2042 | do_procinit(void) |
| 2043 | { |
| 2044 | pid_t *pid_buf; |
| 2045 | int i, npids, pid_bufsize; |
| 2046 | enum status_code prog_status = STATUS_DEAD; |
| 2047 | |
| 2048 | npids = proc_listallpids(NULL, 0); |
| 2049 | if (npids == 0) |
| 2050 | return STATUS_UNKNOWN; |
| 2051 | |
| 2052 | /* Try to avoid sudden changes in number of PIDs. */ |
| 2053 | npids += 4096; |
| 2054 | pid_bufsize = sizeof(pid_t) * npids; |
| 2055 | pid_buf = xmalloc(pid_bufsize); |
| 2056 | |
| 2057 | npids = proc_listallpids(pid_buf, pid_bufsize); |
| 2058 | if (npids == 0) |
| 2059 | return STATUS_UNKNOWN; |
| 2060 | |
| 2061 | for (i = 0; i < npids; i++) { |
| 2062 | enum status_code pid_status; |
| 2063 | |
| 2064 | pid_status = pid_check(pid_buf[i]); |
| 2065 | if (pid_status < prog_status) |
| 2066 | prog_status = pid_status; |
| 2067 | } |
| 2068 | |
| 2069 | free(pid_buf); |
| 2070 | |
| 2071 | return prog_status; |
| 2072 | } |
| 2073 | #elif defined(OS_HPUX) |
| 2074 | static enum status_code |
| 2075 | do_procinit(void) |
| 2076 | { |
| 2077 | struct pst_status pst[10]; |
| 2078 | int i, count; |
| 2079 | int idx = 0; |
| 2080 | enum status_code prog_status = STATUS_DEAD; |
| 2081 | |
| 2082 | while ((count = pstat_getproc(pst, sizeof(pst[0]), 10, idx)) > 0) { |
| 2083 | enum status_code pid_status; |
| 2084 | |
| 2085 | for (i = 0; i < count; i++) { |
| 2086 | pid_status = pid_check(pst[i].pst_pid); |
| 2087 | if (pid_status < prog_status) |
| 2088 | prog_status = pid_status; |
| 2089 | } |
| 2090 | idx = pst[count - 1].pst_idx + 1; |
| 2091 | } |
| 2092 | |
| 2093 | return prog_status; |
| 2094 | } |
| 2095 | #elif defined(OS_FreeBSD) |
| 2096 | static enum status_code |
| 2097 | do_procinit(void) |
| 2098 | { |
| 2099 | struct kinfo_proc *kp; |
| 2100 | int rc, mib[3]; |
| 2101 | size_t len = 0; |
| 2102 | int nentries, i; |
| 2103 | enum status_code prog_status = STATUS_DEAD; |
| 2104 | |
| 2105 | mib[0] = CTL_KERN; |
| 2106 | mib[1] = KERN_PROC; |
| 2107 | mib[2] = KERN_PROC_PROC; |
| 2108 | |
| 2109 | rc = sysctl(mib, 3, NULL, &len, NULL, 0); |
| 2110 | if (rc != 0 && errno != ESRCH) |
| 2111 | return STATUS_UNKNOWN; |
| 2112 | if (len == 0) |
| 2113 | return STATUS_UNKNOWN; |
| 2114 | |
| 2115 | kp = xmalloc(len); |
| 2116 | rc = sysctl(mib, 3, kp, &len, NULL, 0); |
| 2117 | if (rc != 0 && errno != ESRCH) |
| 2118 | return STATUS_UNKNOWN; |
| 2119 | if (len == 0) |
| 2120 | return STATUS_UNKNOWN; |
| 2121 | nentries = len / sizeof(*kp); |
| 2122 | |
| 2123 | for (i = 0; i < nentries; i++) { |
| 2124 | enum status_code pid_status; |
| 2125 | |
| 2126 | pid_status = pid_check(kp[i].ki_pid); |
| 2127 | if (pid_status < prog_status) |
| 2128 | prog_status = pid_status; |
| 2129 | } |
| 2130 | |
| 2131 | free(kp); |
| 2132 | |
| 2133 | return prog_status; |
| 2134 | } |
| 2135 | #elif defined(HAVE_KVM_H) |
| 2136 | static enum status_code |
| 2137 | do_procinit(void) |
| 2138 | { |
| 2139 | kvm_t *kd; |
| 2140 | int nentries, i; |
| 2141 | struct kinfo_proc *kp; |
| 2142 | enum status_code prog_status = STATUS_DEAD; |
| 2143 | |
| 2144 | kd = ssd_kvm_open(); |
| 2145 | kp = ssd_kvm_get_procs(kd, KERN_PROC_ALL, 0, &nentries); |
| 2146 | |
| 2147 | for (i = 0; i < nentries; i++) { |
| 2148 | enum status_code pid_status; |
| 2149 | pid_t pid; |
| 2150 | |
| 2151 | #if defined(OS_FreeBSD) |
| 2152 | pid = kp[i].ki_pid; |
| 2153 | #elif defined(OS_OpenBSD) |
| 2154 | pid = kp[i].p_pid; |
| 2155 | #elif defined(OS_DragonFlyBSD) |
| 2156 | pid = kp[i].kp_pid; |
| 2157 | #else |
| 2158 | pid = kp[i].kp_proc.p_pid; |
| 2159 | #endif |
| 2160 | |
| 2161 | pid_status = pid_check(pid); |
| 2162 | if (pid_status < prog_status) |
| 2163 | prog_status = pid_status; |
| 2164 | } |
| 2165 | |
| 2166 | kvm_close(kd); |
| 2167 | |
| 2168 | return prog_status; |
| 2169 | } |
| 2170 | #endif |
| 2171 | |
| 2172 | static enum status_code |
| 2173 | do_findprocs(void) |
| 2174 | { |
| 2175 | pid_list_free(&found); |
| 2176 | |
| 2177 | if (match_pid > 0) |
| 2178 | return pid_check(match_pid); |
| 2179 | else if (pidfile) |
| 2180 | return do_pidfile(pidfile); |
| 2181 | else |
| 2182 | return do_procinit(); |
| 2183 | } |
| 2184 | |
| 2185 | static int |
| 2186 | do_start(int argc, char **argv) |
| 2187 | { |
| 2188 | int devnull_fd = -1; |
| 2189 | gid_t rgid; |
| 2190 | uid_t ruid; |
| 2191 | |
| 2192 | do_findprocs(); |
| 2193 | |
| 2194 | if (found) { |
| 2195 | if (quietmode <= 0) |
| 2196 | printf("%s already running.\n", execname ? execname : "process"); |
| 2197 | return exitnodo; |
| 2198 | } |
| 2199 | if (testmode && quietmode <= 0) { |
| 2200 | printf("Would start %s ", startas); |
| 2201 | while (argc-- > 0) |
| 2202 | printf("%s ", *argv++); |
| 2203 | if (changeuser != NULL) { |
| 2204 | printf(" (as user %s[%d]", changeuser, runas_uid); |
| 2205 | if (changegroup != NULL) |
| 2206 | printf(", and group %s[%d])", changegroup, runas_gid); |
| 2207 | else |
| 2208 | printf(")"); |
| 2209 | } |
| 2210 | if (changeroot != NULL) |
| 2211 | printf(" in directory %s", changeroot); |
| 2212 | if (nicelevel) |
| 2213 | printf(", and add %i to the priority", nicelevel); |
| 2214 | if (proc_sched) |
| 2215 | printf(", with scheduling policy %s with priority %i", |
| 2216 | proc_sched->policy_name, proc_sched->priority); |
| 2217 | if (io_sched) |
| 2218 | printf(", with IO scheduling class %s with priority %i", |
| 2219 | io_sched->policy_name, io_sched->priority); |
| 2220 | printf(".\n"); |
| 2221 | } |
| 2222 | if (testmode) |
| 2223 | return 0; |
| 2224 | if (quietmode < 0) |
| 2225 | printf("Starting %s...\n", startas); |
| 2226 | *--argv = startas; |
| 2227 | if (background) |
| 2228 | /* Ok, we need to detach this process. */ |
| 2229 | daemonize(); |
| 2230 | else if (mpidfile && pidfile != NULL) |
| 2231 | /* User wants _us_ to make the pidfile, but detach themself! */ |
| 2232 | write_pidfile(pidfile, getpid()); |
| 2233 | if (background && close_io) { |
| 2234 | devnull_fd = open("/dev/null", O_RDWR); |
| 2235 | if (devnull_fd < 0) |
| 2236 | fatal("unable to open '%s'", "/dev/null"); |
| 2237 | } |
| 2238 | if (nicelevel) { |
| 2239 | errno = 0; |
| 2240 | if ((nice(nicelevel) == -1) && (errno != 0)) |
| 2241 | fatal("unable to alter nice level by %i", nicelevel); |
| 2242 | } |
| 2243 | if (proc_sched) |
| 2244 | set_proc_schedule(proc_sched); |
| 2245 | if (io_sched) |
| 2246 | set_io_schedule(io_sched); |
| 2247 | if (umask_value >= 0) |
| 2248 | umask(umask_value); |
| 2249 | if (changeroot != NULL) { |
| 2250 | if (chdir(changeroot) < 0) |
| 2251 | fatal("unable to chdir() to %s", changeroot); |
| 2252 | if (chroot(changeroot) < 0) |
| 2253 | fatal("unable to chroot() to %s", changeroot); |
| 2254 | } |
| 2255 | if (chdir(changedir) < 0) |
| 2256 | fatal("unable to chdir() to %s", changedir); |
| 2257 | |
| 2258 | rgid = getgid(); |
| 2259 | ruid = getuid(); |
| 2260 | if (changegroup != NULL) { |
| 2261 | if (rgid != (gid_t)runas_gid) |
| 2262 | if (setgid(runas_gid)) |
| 2263 | fatal("unable to set gid to %d", runas_gid); |
| 2264 | } |
| 2265 | if (changeuser != NULL) { |
| 2266 | /* We assume that if our real user and group are the same as |
| 2267 | * the ones we should switch to, the supplementary groups |
| 2268 | * will be already in place. */ |
| 2269 | if (rgid != (gid_t)runas_gid || ruid != (uid_t)runas_uid) |
| 2270 | if (initgroups(changeuser, runas_gid)) |
| 2271 | fatal("unable to set initgroups() with gid %d", |
| 2272 | runas_gid); |
| 2273 | |
| 2274 | if (ruid != (uid_t)runas_uid) |
| 2275 | if (setuid(runas_uid)) |
| 2276 | fatal("unable to set uid to %s", changeuser); |
| 2277 | } |
| 2278 | |
| 2279 | if (background && close_io) { |
| 2280 | int i; |
| 2281 | |
| 2282 | dup2(devnull_fd, 0); /* stdin */ |
| 2283 | dup2(devnull_fd, 1); /* stdout */ |
| 2284 | dup2(devnull_fd, 2); /* stderr */ |
| 2285 | |
| 2286 | /* Now close all extra fds. */ |
| 2287 | for (i = get_open_fd_max() - 1; i >= 3; --i) |
| 2288 | close(i); |
| 2289 | } |
| 2290 | execv(startas, argv); |
| 2291 | fatal("unable to start %s", startas); |
| 2292 | } |
| 2293 | |
| 2294 | static void |
| 2295 | do_stop(int sig_num, int *n_killed, int *n_notkilled) |
| 2296 | { |
| 2297 | struct pid_list *p; |
| 2298 | |
| 2299 | do_findprocs(); |
| 2300 | |
| 2301 | *n_killed = 0; |
| 2302 | *n_notkilled = 0; |
| 2303 | |
| 2304 | if (!found) |
| 2305 | return; |
| 2306 | |
| 2307 | pid_list_free(&killed); |
| 2308 | |
| 2309 | for (p = found; p; p = p->next) { |
| 2310 | if (testmode) { |
| 2311 | if (quietmode <= 0) |
| 2312 | printf("Would send signal %d to %d.\n", |
| 2313 | sig_num, p->pid); |
| 2314 | (*n_killed)++; |
| 2315 | } else if (kill(p->pid, sig_num) == 0) { |
| 2316 | pid_list_push(&killed, p->pid); |
| 2317 | (*n_killed)++; |
| 2318 | } else { |
| 2319 | if (sig_num) |
| 2320 | warning("failed to kill %d: %s\n", |
| 2321 | p->pid, strerror(errno)); |
| 2322 | (*n_notkilled)++; |
| 2323 | } |
| 2324 | } |
| 2325 | } |
| 2326 | |
| 2327 | static void |
| 2328 | do_stop_summary(int retry_nr) |
| 2329 | { |
| 2330 | struct pid_list *p; |
| 2331 | |
| 2332 | if (quietmode >= 0 || !killed) |
| 2333 | return; |
| 2334 | |
| 2335 | printf("Stopped %s (pid", what_stop); |
| 2336 | for (p = killed; p; p = p->next) |
| 2337 | printf(" %d", p->pid); |
| 2338 | putchar(')'); |
| 2339 | if (retry_nr > 0) |
| 2340 | printf(", retry #%d", retry_nr); |
| 2341 | printf(".\n"); |
| 2342 | } |
| 2343 | |
| 2344 | static void DPKG_ATTR_PRINTF(1) |
| 2345 | set_what_stop(const char *format, ...) |
| 2346 | { |
| 2347 | va_list arglist; |
| 2348 | int rc; |
| 2349 | |
| 2350 | va_start(arglist, format); |
| 2351 | rc = vasprintf(&what_stop, format, arglist); |
| 2352 | va_end(arglist); |
| 2353 | |
| 2354 | if (rc < 0) |
| 2355 | fatal("cannot allocate formatted string"); |
| 2356 | } |
| 2357 | |
| 2358 | /* |
| 2359 | * We want to keep polling for the processes, to see if they've exited, or |
| 2360 | * until the timeout expires. |
| 2361 | * |
| 2362 | * This is a somewhat complicated algorithm to try to ensure that we notice |
| 2363 | * reasonably quickly when all the processes have exited, but don't spend |
| 2364 | * too much CPU time polling. In particular, on a fast machine with |
| 2365 | * quick-exiting daemons we don't want to delay system shutdown too much, |
| 2366 | * whereas on a slow one, or where processes are taking some time to exit, |
| 2367 | * we want to increase the polling interval. |
| 2368 | * |
| 2369 | * The algorithm is as follows: we measure the elapsed time it takes to do |
| 2370 | * one poll(), and wait a multiple of this time for the next poll. However, |
| 2371 | * if that would put us past the end of the timeout period we wait only as |
| 2372 | * long as the timeout period, but in any case we always wait at least |
| 2373 | * MIN_POLL_INTERVAL (20ms). The multiple (‘ratio’) starts out as 2, and |
| 2374 | * increases by 1 for each poll to a maximum of 10; so we use up to between |
| 2375 | * 30% and 10% of the machine's resources (assuming a few reasonable things |
| 2376 | * about system performance). |
| 2377 | */ |
| 2378 | static bool |
| 2379 | do_stop_timeout(int timeout, int *n_killed, int *n_notkilled) |
| 2380 | { |
| 2381 | struct timespec stopat, before, after, interval, maxinterval; |
| 2382 | int rc, ratio; |
| 2383 | |
| 2384 | timespec_gettime(&stopat); |
| 2385 | stopat.tv_sec += timeout; |
| 2386 | ratio = 1; |
| 2387 | for (;;) { |
| 2388 | timespec_gettime(&before); |
| 2389 | if (timespec_cmp(&before, &stopat, >)) |
| 2390 | return false; |
| 2391 | |
| 2392 | do_stop(0, n_killed, n_notkilled); |
| 2393 | if (!*n_killed) |
| 2394 | return true; |
| 2395 | |
| 2396 | timespec_gettime(&after); |
| 2397 | |
| 2398 | if (!timespec_cmp(&after, &stopat, <)) |
| 2399 | return false; |
| 2400 | |
| 2401 | if (ratio < 10) |
| 2402 | ratio++; |
| 2403 | |
| 2404 | timespec_sub(&stopat, &after, &maxinterval); |
| 2405 | timespec_sub(&after, &before, &interval); |
| 2406 | timespec_mul(&interval, ratio); |
| 2407 | |
| 2408 | if (interval.tv_sec < 0 || interval.tv_nsec < 0) |
| 2409 | interval.tv_sec = interval.tv_nsec = 0; |
| 2410 | |
| 2411 | if (timespec_cmp(&interval, &maxinterval, >)) |
| 2412 | interval = maxinterval; |
| 2413 | |
| 2414 | if (interval.tv_sec == 0 && |
| 2415 | interval.tv_nsec <= MIN_POLL_INTERVAL) |
| 2416 | interval.tv_nsec = MIN_POLL_INTERVAL; |
| 2417 | |
| 2418 | rc = pselect(0, NULL, NULL, NULL, &interval, NULL); |
| 2419 | if (rc < 0 && errno != EINTR) |
| 2420 | fatal("select() failed for pause"); |
| 2421 | } |
| 2422 | } |
| 2423 | |
| 2424 | static int |
| 2425 | finish_stop_schedule(bool anykilled) |
| 2426 | { |
| 2427 | if (rpidfile && pidfile && !testmode) |
| 2428 | remove_pidfile(pidfile); |
| 2429 | |
| 2430 | if (anykilled) |
| 2431 | return 0; |
| 2432 | |
| 2433 | if (quietmode <= 0) |
| 2434 | printf("No %s found running; none killed.\n", what_stop); |
| 2435 | |
| 2436 | return exitnodo; |
| 2437 | } |
| 2438 | |
| 2439 | static int |
| 2440 | run_stop_schedule(void) |
| 2441 | { |
| 2442 | int position, n_killed, n_notkilled, value, retry_nr; |
| 2443 | bool anykilled; |
| 2444 | |
| 2445 | if (testmode) { |
| 2446 | if (schedule != NULL) { |
| 2447 | if (quietmode <= 0) |
| 2448 | printf("Ignoring --retry in test mode\n"); |
| 2449 | schedule = NULL; |
| 2450 | } |
| 2451 | } |
| 2452 | |
| 2453 | if (cmdname) |
| 2454 | set_what_stop("%s", cmdname); |
| 2455 | else if (execname) |
| 2456 | set_what_stop("%s", execname); |
| 2457 | else if (pidfile) |
| 2458 | set_what_stop("process in pidfile '%s'", pidfile); |
| 2459 | else if (match_pid > 0) |
| 2460 | set_what_stop("process with pid %d", match_pid); |
| 2461 | else if (match_ppid > 0) |
| 2462 | set_what_stop("process(es) with parent pid %d", match_ppid); |
| 2463 | else if (userspec) |
| 2464 | set_what_stop("process(es) owned by '%s'", userspec); |
| 2465 | else |
| 2466 | fatal("internal error, no match option, please report"); |
| 2467 | |
| 2468 | anykilled = false; |
| 2469 | retry_nr = 0; |
| 2470 | |
| 2471 | if (schedule == NULL) { |
| 2472 | do_stop(signal_nr, &n_killed, &n_notkilled); |
| 2473 | do_stop_summary(0); |
| 2474 | if (n_notkilled > 0 && quietmode <= 0) |
| 2475 | printf("%d pids were not killed\n", n_notkilled); |
| 2476 | if (n_killed) |
| 2477 | anykilled = true; |
| 2478 | return finish_stop_schedule(anykilled); |
| 2479 | } |
| 2480 | |
| 2481 | for (position = 0; position < schedule_length; position++) { |
| 2482 | reposition: |
| 2483 | value = schedule[position].value; |
| 2484 | n_notkilled = 0; |
| 2485 | |
| 2486 | switch (schedule[position].type) { |
| 2487 | case sched_goto: |
| 2488 | position = value; |
| 2489 | goto reposition; |
| 2490 | case sched_signal: |
| 2491 | do_stop(value, &n_killed, &n_notkilled); |
| 2492 | do_stop_summary(retry_nr++); |
| 2493 | if (!n_killed) |
| 2494 | return finish_stop_schedule(anykilled); |
| 2495 | else |
| 2496 | anykilled = true; |
| 2497 | continue; |
| 2498 | case sched_timeout: |
| 2499 | if (do_stop_timeout(value, &n_killed, &n_notkilled)) |
| 2500 | return finish_stop_schedule(anykilled); |
| 2501 | else |
| 2502 | continue; |
| 2503 | default: |
| 2504 | assert(!"schedule[].type value must be valid"); |
| 2505 | } |
| 2506 | } |
| 2507 | |
| 2508 | if (quietmode <= 0) |
| 2509 | printf("Program %s, %d process(es), refused to die.\n", |
| 2510 | what_stop, n_killed); |
| 2511 | |
| 2512 | return 2; |
| 2513 | } |
| 2514 | |
| 2515 | int |
| 2516 | main(int argc, char **argv) |
| 2517 | { |
| 2518 | progname = argv[0]; |
| 2519 | |
| 2520 | parse_options(argc, argv); |
| 2521 | setup_options(); |
| 2522 | |
| 2523 | argc -= optind; |
| 2524 | argv += optind; |
| 2525 | |
| 2526 | if (action == ACTION_START) |
| 2527 | return do_start(argc, argv); |
| 2528 | else if (action == ACTION_STOP) |
| 2529 | return run_stop_schedule(); |
| 2530 | else if (action == ACTION_STATUS) |
| 2531 | return do_findprocs(); |
| 2532 | |
| 2533 | return 0; |
| 2534 | } |