/* vi: set sw=4 ts=4: */ /* * Mini kill/killall[5] implementation for busybox * * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>. * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> * * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. */ #include "libbb.h" /* Note: kill_main is directly called from shell in order to implement * kill built-in. Shell substitutes job ids with process groups first. * * This brings some complications: * * + we can't use xfunc here * + we can't use applet_name * + we can't use bb_show_usage * (Above doesn't apply for killall[5] cases) * * kill %n gets translated into kill ' -<process group>' by shell (note space!) * This is needed to avoid collision with kill -9 ... syntax */ int kill_main(int argc, char **argv) { char *arg; pid_t pid; int signo = SIGTERM, errors = 0, quiet = 0; #if !ENABLE_KILLALL && !ENABLE_KILLALL5 #define killall 0 #define killall5 0 #else /* How to determine who we are? find 3rd char from the end: * kill, killall, killall5 * ^i ^a ^l - it's unique * (checking from the start is complicated by /bin/kill... case) */ const char char3 = argv[0][strlen(argv[0]) - 3]; #define killall (ENABLE_KILLALL && char3 == 'a') #define killall5 (ENABLE_KILLALL5 && char3 == 'l') #endif /* Parse any options */ argc--; arg = *++argv; if (argc < 1 || arg[0] != '-') { goto do_it_now; } /* The -l option, which prints out signal names. * Intended usage in shell: * echo "Died of SIG`kill -l $?`" * We try to mimic what kill from coreutils-6.8 does */ if (arg[1] == 'l' && arg[2] == '\0') { if (argc == 1) { /* Print the whole signal list */ print_signames(); return 0; } /* -l <sig list> */ while ((arg = *++argv)) { if (isdigit(arg[0])) { signo = bb_strtou(arg, NULL, 10); if (errno) { bb_error_msg("unknown signal '%s'", arg); return EXIT_FAILURE; } /* Exitcodes >= 0x80 are to be treated * as "killed by signal (exitcode & 0x7f)" */ puts(get_signame(signo & 0x7f)); /* TODO: 'bad' signal# - coreutils says: * kill: 127: invalid signal * we just print "127" instead */ } else { signo = get_signum(arg); if (signo < 0) { bb_error_msg("unknown signal '%s'", arg); return EXIT_FAILURE; } printf("%d\n", signo); } } /* If they specified -l, we are all done */ return EXIT_SUCCESS; } /* The -q quiet option */ if (killall && arg[1] == 'q' && arg[2] == '\0') { quiet = 1; arg = *++argv; argc--; if (argc < 1) bb_show_usage(); if (arg[0] != '-') goto do_it_now; } arg++; /* skip '-' */ if (argc > 1 && arg[0] == 's' && arg[1] == '\0') { /* -s SIG? */ argc--; arg = *++argv; } /* else it must be -SIG */ signo = get_signum(arg); if (signo < 0) { /* || signo > MAX_SIGNUM ? */ bb_error_msg("bad signal name '%s'", arg); return EXIT_FAILURE; } arg = *++argv; argc--; do_it_now: pid = getpid(); if (killall5) { pid_t sid; procps_status_t* p = NULL; /* Find out our own session id */ sid = getsid(pid); /* Now stop all processes */ kill(-1, SIGSTOP); /* Now kill all processes except our session */ while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_SID))) { if (p->sid != (unsigned)sid && p->pid != (unsigned)pid && p->pid != 1) kill(p->pid, signo); } /* And let them continue */ kill(-1, SIGCONT); return 0; } /* Pid or name is required for kill/killall */ if (argc < 1) { bb_error_msg("you need to specify whom to kill"); return EXIT_FAILURE; } if (killall) { /* Looks like they want to do a killall. Do that */ while (arg) { pid_t* pidList; pidList = find_pid_by_name(arg); if (*pidList == 0) { errors++; if (!quiet) bb_error_msg("%s: no process killed", arg); } else { pid_t *pl; for (pl = pidList; *pl; pl++) { if (*pl == pid) continue; if (kill(*pl, signo) == 0) continue; errors++; if (!quiet) bb_perror_msg("cannot kill pid %u", (unsigned)*pl); } } free(pidList); arg = *++argv; } return errors; } /* Looks like they want to do a kill. Do that */ while (arg) { /* Support shell 'space' trick */ if (arg[0] == ' ') arg++; pid = bb_strtoi(arg, NULL, 10); if (errno) { bb_error_msg("bad pid '%s'", arg); errors++; } else if (kill(pid, signo) != 0) { bb_perror_msg("cannot kill pid %d", (int)pid); errors++; } arg = *++argv; } return errors; }