diff options
Diffstat (limited to 'procps/kill.c')
| -rw-r--r-- | procps/kill.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/procps/kill.c b/procps/kill.c new file mode 100644 index 0000000..1405500 --- /dev/null +++ b/procps/kill.c @@ -0,0 +1,184 @@ +/* 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; +} |