1 /* vi: set sw=4 ts=4: */
3 * Mini kill/killall[5] implementation for busybox
5 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
6 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
11 //usage:#define kill_trivial_usage
12 //usage: "[-l] [-SIG] PID..."
13 //usage:#define kill_full_usage "\n\n"
14 //usage: "Send a signal (default: TERM) to given PIDs\n"
15 //usage: "\n -l List all signal names and numbers"
16 /* //usage: "\n -s SIG Yet another way of specifying SIG" */
18 //usage:#define kill_example_usage
19 //usage: "$ ps | grep apache\n"
20 //usage: "252 root root S [apache]\n"
21 //usage: "263 www-data www-data S [apache]\n"
22 //usage: "264 www-data www-data S [apache]\n"
23 //usage: "265 www-data www-data S [apache]\n"
24 //usage: "266 www-data www-data S [apache]\n"
25 //usage: "267 www-data www-data S [apache]\n"
26 //usage: "$ kill 252\n"
28 //usage:#define killall_trivial_usage
29 //usage: "[-l] [-q] [-SIG] PROCESS_NAME..."
30 //usage:#define killall_full_usage "\n\n"
31 //usage: "Send a signal (default: TERM) to given processes\n"
32 //usage: "\n -l List all signal names and numbers"
33 /* //usage: "\n -s SIG Yet another way of specifying SIG" */
34 //usage: "\n -q Don't complain if no processes were killed"
36 //usage:#define killall_example_usage
37 //usage: "$ killall apache\n"
39 //usage:#define killall5_trivial_usage
40 //usage: "[-l] [-SIG] [-o PID]..."
41 //usage:#define killall5_full_usage "\n\n"
42 //usage: "Send a signal (default: TERM) to all processes outside current session\n"
43 //usage: "\n -l List all signal names and numbers"
44 //usage: "\n -o PID Don't signal this PID"
45 /* //usage: "\n -s SIG Yet another way of specifying SIG" */
49 /* Note: kill_main is directly called from shell in order to implement
50 * kill built-in. Shell substitutes job ids with process groups first.
52 * This brings some complications:
54 * + we can't use xfunc here
55 * + we can't use applet_name
56 * + we can't use bb_show_usage
57 * (Above doesn't apply for killall[5] cases)
59 * kill %n gets translated into kill ' -<process group>' by shell (note space!)
60 * This is needed to avoid collision with kill -9 ... syntax
63 int kill_main(int argc, char **argv)
67 int signo = SIGTERM, errors = 0, quiet = 0;
68 #if !ENABLE_KILLALL && !ENABLE_KILLALL5
72 /* How to determine who we are? find 3rd char from the end:
73 * kill, killall, killall5
74 * ^i ^a ^l - it's unique
75 * (checking from the start is complicated by /bin/kill... case) */
76 const char char3 = argv[0][strlen(argv[0]) - 3];
77 #define killall (ENABLE_KILLALL && char3 == 'a')
78 #define killall5 (ENABLE_KILLALL5 && char3 == 'l')
81 /* Parse any options */
85 if (argc < 1 || arg[0] != '-') {
89 /* The -l option, which prints out signal names.
90 * Intended usage in shell:
91 * echo "Died of SIG`kill -l $?`"
92 * We try to mimic what kill from coreutils-6.8 does */
93 if (arg[1] == 'l' && arg[2] == '\0') {
95 /* Print the whole signal list */
100 while ((arg = *++argv)) {
101 if (isdigit(arg[0])) {
102 signo = bb_strtou(arg, NULL, 10);
104 bb_error_msg("unknown signal '%s'", arg);
107 /* Exitcodes >= 0x80 are to be treated
108 * as "killed by signal (exitcode & 0x7f)" */
109 puts(get_signame(signo & 0x7f));
110 /* TODO: 'bad' signal# - coreutils says:
111 * kill: 127: invalid signal
112 * we just print "127" instead */
114 signo = get_signum(arg);
116 bb_error_msg("unknown signal '%s'", arg);
119 printf("%d\n", signo);
122 /* If they specified -l, we are all done */
126 /* The -q quiet option */
127 if (killall && arg[1] == 'q' && arg[2] == '\0') {
137 arg++; /* skip '-' */
139 /* -o PID? (if present, it always is at the end of command line) */
140 if (killall5 && arg[0] == 'o')
143 if (argc > 1 && arg[0] == 's' && arg[1] == '\0') { /* -s SIG? */
146 } /* else it must be -SIG */
147 signo = get_signum(arg);
148 if (signo < 0) { /* || signo > MAX_SIGNUM ? */
149 bb_error_msg("bad signal name '%s'", arg);
160 procps_status_t* p = NULL;
163 /* Find out our session id */
165 /* Stop all processes */
166 if (signo != SIGSTOP && signo != SIGCONT)
168 /* Signal all processes except those in our session */
169 while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_SID)) != NULL) {
172 if (p->sid == (unsigned)sid
173 || p->pid == (unsigned)pid
179 /* All remaining args must be -o PID options.
180 * Check p->pid against them. */
181 for (i = 0; i < argc; i++) {
185 if (arg[0] != '-' || arg[1] != 'o') {
186 bb_error_msg("bad option '%s'", arg);
191 if (!arg[0] && argv[++i])
193 omit = bb_strtoi(arg, NULL, 10);
195 bb_error_msg("invalid number '%s'", arg);
206 /* And let them continue */
207 if (signo != SIGSTOP && signo != SIGCONT)
212 /* Pid or name is required for kill/killall */
214 bb_error_msg("you need to specify whom to kill");
219 /* Looks like they want to do a killall. Do that */
223 pidList = find_pid_by_name(arg);
227 bb_error_msg("%s: no process killed", arg);
231 for (pl = pidList; *pl; pl++) {
234 if (kill(*pl, signo) == 0)
238 bb_perror_msg("can't kill pid %d", (int)*pl);
247 /* Looks like they want to do a kill. Do that */
249 #if ENABLE_ASH || ENABLE_HUSH
251 * We need to support shell's "hack formats" of
252 * " -PRGP_ID" (yes, with a leading space)
253 * and " PID1 PID2 PID3" (with degenerate case "")
255 while (*arg != '\0') {
259 pid = bb_strtoi(arg, &end, 10);
260 if (errno && (errno != EINVAL || *end != ' ')) {
261 bb_error_msg("invalid number '%s'", arg);
265 if (kill(pid, signo) != 0) {
266 bb_perror_msg("can't kill pid %d", (int)pid);
269 arg = end; /* can only point to ' ' or '\0' now */
272 pid = bb_strtoi(arg, NULL, 10);
274 bb_error_msg("invalid number '%s'", arg);
276 } else if (kill(pid, signo) != 0) {
277 bb_perror_msg("can't kill pid %d", (int)pid);