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text data bss dec hexfilename 838650 8009 0 846659 ceb43busybox_old 838519 8009 0 846528 ceac0busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
224 lines
5.1 KiB
C
224 lines
5.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini kill/killall[5] implementation for busybox
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*
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* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#include "libbb.h"
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/* Note: kill_main is directly called from shell in order to implement
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* kill built-in. Shell substitutes job ids with process groups first.
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*
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* This brings some complications:
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*
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* + we can't use xfunc here
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* + we can't use applet_name
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* + we can't use bb_show_usage
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* (Above doesn't apply for killall[5] cases)
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*
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* kill %n gets translated into kill ' -<process group>' by shell (note space!)
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* This is needed to avoid collision with kill -9 ... syntax
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*/
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int kill_main(int argc, char **argv)
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{
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char *arg;
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pid_t pid;
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int signo = SIGTERM, errors = 0, quiet = 0;
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#if !ENABLE_KILLALL && !ENABLE_KILLALL5
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#define killall 0
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#define killall5 0
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#else
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/* How to determine who we are? find 3rd char from the end:
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* kill, killall, killall5
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* ^i ^a ^l - it's unique
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* (checking from the start is complicated by /bin/kill... case) */
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const char char3 = argv[0][strlen(argv[0]) - 3];
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#define killall (ENABLE_KILLALL && char3 == 'a')
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#define killall5 (ENABLE_KILLALL5 && char3 == 'l')
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#endif
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/* Parse any options */
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argc--;
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arg = *++argv;
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if (argc < 1 || arg[0] != '-') {
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goto do_it_now;
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}
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/* The -l option, which prints out signal names.
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* Intended usage in shell:
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* echo "Died of SIG`kill -l $?`"
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* We try to mimic what kill from coreutils-6.8 does */
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if (arg[1] == 'l' && arg[2] == '\0') {
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if (argc == 1) {
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/* Print the whole signal list */
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print_signames();
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return 0;
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}
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/* -l <sig list> */
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while ((arg = *++argv)) {
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if (isdigit(arg[0])) {
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signo = bb_strtou(arg, NULL, 10);
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if (errno) {
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bb_error_msg("unknown signal '%s'", arg);
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return EXIT_FAILURE;
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}
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/* Exitcodes >= 0x80 are to be treated
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* as "killed by signal (exitcode & 0x7f)" */
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puts(get_signame(signo & 0x7f));
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/* TODO: 'bad' signal# - coreutils says:
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* kill: 127: invalid signal
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* we just print "127" instead */
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} else {
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signo = get_signum(arg);
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if (signo < 0) {
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bb_error_msg("unknown signal '%s'", arg);
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return EXIT_FAILURE;
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}
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printf("%d\n", signo);
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}
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}
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/* If they specified -l, we are all done */
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return EXIT_SUCCESS;
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}
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/* The -q quiet option */
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if (killall && arg[1] == 'q' && arg[2] == '\0') {
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quiet = 1;
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arg = *++argv;
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argc--;
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if (argc < 1)
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bb_show_usage();
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if (arg[0] != '-')
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goto do_it_now;
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}
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arg++; /* skip '-' */
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/* -o PID? (if present, it always is at the end of command line) */
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if (killall5 && arg[0] == 'o')
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goto do_it_now;
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if (argc > 1 && arg[0] == 's' && arg[1] == '\0') { /* -s SIG? */
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argc--;
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arg = *++argv;
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} /* else it must be -SIG */
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signo = get_signum(arg);
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if (signo < 0) { /* || signo > MAX_SIGNUM ? */
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bb_error_msg("bad signal name '%s'", arg);
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return EXIT_FAILURE;
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}
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arg = *++argv;
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argc--;
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do_it_now:
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pid = getpid();
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if (killall5) {
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pid_t sid;
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procps_status_t* p = NULL;
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int ret = 0;
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/* Find out our session id */
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sid = getsid(pid);
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/* Stop all processes */
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kill(-1, SIGSTOP);
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/* Signal all processes except those in our session */
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while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_SID))) {
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int i;
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if (p->sid == (unsigned)sid
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|| p->pid == (unsigned)pid
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|| p->pid == 1)
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continue;
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/* All remaining args must be -o PID options.
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* Check p->pid against them. */
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for (i = 0; i < argc; i++) {
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pid_t omit;
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arg = argv[i];
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if (arg[0] != '-' || arg[1] != 'o') {
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bb_error_msg("bad option '%s'", arg);
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ret = 1;
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goto resume;
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}
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arg += 2;
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if (!arg[0] && argv[++i])
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arg = argv[i];
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omit = bb_strtoi(arg, NULL, 10);
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if (errno) {
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bb_error_msg("bad pid '%s'", arg);
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ret = 1;
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goto resume;
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}
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if (p->pid == omit)
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goto dont_kill;
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}
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kill(p->pid, signo);
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dont_kill: ;
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}
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resume:
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/* And let them continue */
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kill(-1, SIGCONT);
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return ret;
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}
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/* Pid or name is required for kill/killall */
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if (argc < 1) {
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bb_error_msg("you need to specify whom to kill");
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return EXIT_FAILURE;
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}
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if (killall) {
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/* Looks like they want to do a killall. Do that */
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while (arg) {
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pid_t* pidList;
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pidList = find_pid_by_name(arg);
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if (*pidList == 0) {
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errors++;
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if (!quiet)
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bb_error_msg("%s: no process killed", arg);
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} else {
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pid_t *pl;
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for (pl = pidList; *pl; pl++) {
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if (*pl == pid)
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continue;
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if (kill(*pl, signo) == 0)
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continue;
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errors++;
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if (!quiet)
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bb_perror_msg("can't kill pid %d", (int)*pl);
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}
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}
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free(pidList);
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arg = *++argv;
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}
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return errors;
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}
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/* Looks like they want to do a kill. Do that */
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while (arg) {
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/* Support shell 'space' trick */
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if (arg[0] == ' ')
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arg++;
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pid = bb_strtoi(arg, NULL, 10);
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if (errno) {
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bb_error_msg("bad pid '%s'", arg);
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errors++;
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} else if (kill(pid, signo) != 0) {
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bb_perror_msg("can't kill pid %d", (int)pid);
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errors++;
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}
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arg = *++argv;
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}
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return errors;
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}
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