1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * Mini kill/killall[5] implementation for busybox
|
---|
4 | *
|
---|
5 | * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
|
---|
6 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
|
---|
7 | *
|
---|
8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
---|
9 | */
|
---|
10 |
|
---|
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" */
|
---|
17 | //usage:
|
---|
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"
|
---|
27 | //usage:
|
---|
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"
|
---|
35 | //usage:
|
---|
36 | //usage:#define killall_example_usage
|
---|
37 | //usage: "$ killall apache\n"
|
---|
38 | //usage:
|
---|
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" */
|
---|
46 |
|
---|
47 | #include "libbb.h"
|
---|
48 |
|
---|
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.
|
---|
51 | *
|
---|
52 | * This brings some complications:
|
---|
53 | *
|
---|
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)
|
---|
58 | *
|
---|
59 | * kill %n gets translated into kill ' -<process group>' by shell (note space!)
|
---|
60 | * This is needed to avoid collision with kill -9 ... syntax
|
---|
61 | */
|
---|
62 |
|
---|
63 | int kill_main(int argc UNUSED_PARAM, char **argv)
|
---|
64 | {
|
---|
65 | char *arg;
|
---|
66 | pid_t pid;
|
---|
67 | int signo = SIGTERM, errors = 0, quiet = 0;
|
---|
68 | #if !ENABLE_KILLALL && !ENABLE_KILLALL5
|
---|
69 | #define killall 0
|
---|
70 | #define killall5 0
|
---|
71 | #else
|
---|
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')
|
---|
79 | #endif
|
---|
80 |
|
---|
81 | /* Parse any options */
|
---|
82 | arg = *++argv;
|
---|
83 |
|
---|
84 | if (!arg || arg[0] != '-') {
|
---|
85 | goto do_it_now;
|
---|
86 | }
|
---|
87 |
|
---|
88 | /* The -l option, which prints out signal names.
|
---|
89 | * Intended usage in shell:
|
---|
90 | * echo "Died of SIG`kill -l $?`"
|
---|
91 | * We try to mimic what kill from coreutils-6.8 does */
|
---|
92 | if (arg[1] == 'l' && arg[2] == '\0') {
|
---|
93 | arg = *++argv;
|
---|
94 | if (!arg) {
|
---|
95 | /* Print the whole signal list */
|
---|
96 | print_signames();
|
---|
97 | return 0;
|
---|
98 | }
|
---|
99 | /* -l <sig list> */
|
---|
100 | do {
|
---|
101 | if (isdigit(arg[0])) {
|
---|
102 | signo = bb_strtou(arg, NULL, 10);
|
---|
103 | if (errno) {
|
---|
104 | bb_error_msg("unknown signal '%s'", arg);
|
---|
105 | return EXIT_FAILURE;
|
---|
106 | }
|
---|
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 */
|
---|
113 | } else {
|
---|
114 | signo = get_signum(arg);
|
---|
115 | if (signo < 0) {
|
---|
116 | bb_error_msg("unknown signal '%s'", arg);
|
---|
117 | return EXIT_FAILURE;
|
---|
118 | }
|
---|
119 | printf("%d\n", signo);
|
---|
120 | }
|
---|
121 | arg = *++argv;
|
---|
122 | } while (arg);
|
---|
123 | return EXIT_SUCCESS;
|
---|
124 | }
|
---|
125 |
|
---|
126 | /* The -q quiet option */
|
---|
127 | if (killall && arg[1] == 'q' && arg[2] == '\0') {
|
---|
128 | quiet = 1;
|
---|
129 | arg = *++argv;
|
---|
130 | if (!arg)
|
---|
131 | bb_show_usage();
|
---|
132 | if (arg[0] != '-')
|
---|
133 | goto do_it_now;
|
---|
134 | }
|
---|
135 |
|
---|
136 | arg++; /* skip '-' */
|
---|
137 |
|
---|
138 | /* -o PID? (if present, it always is at the end of command line) */
|
---|
139 | if (killall5 && arg[0] == 'o')
|
---|
140 | goto do_it_now;
|
---|
141 |
|
---|
142 | if (argv[1] && arg[0] == 's' && arg[1] == '\0') { /* -s SIG? */
|
---|
143 | arg = *++argv;
|
---|
144 | } /* else it must be -SIG */
|
---|
145 | signo = get_signum(arg);
|
---|
146 | if (signo < 0) { /* || signo > MAX_SIGNUM ? */
|
---|
147 | bb_error_msg("bad signal name '%s'", arg);
|
---|
148 | return EXIT_FAILURE;
|
---|
149 | }
|
---|
150 | arg = *++argv;
|
---|
151 |
|
---|
152 | do_it_now:
|
---|
153 | pid = getpid();
|
---|
154 |
|
---|
155 | if (killall5) {
|
---|
156 | pid_t sid;
|
---|
157 | procps_status_t* p = NULL;
|
---|
158 | /* compat: exitcode 2 is "no one was signaled" */
|
---|
159 | int ret = 2;
|
---|
160 |
|
---|
161 | /* Find out our session id */
|
---|
162 | sid = getsid(pid);
|
---|
163 | /* Stop all processes */
|
---|
164 | if (signo != SIGSTOP && signo != SIGCONT)
|
---|
165 | kill(-1, SIGSTOP);
|
---|
166 | /* Signal all processes except those in our session */
|
---|
167 | while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_SID)) != NULL) {
|
---|
168 | char **args;
|
---|
169 |
|
---|
170 | if (p->sid == (unsigned)sid
|
---|
171 | || p->sid == 0 /* compat: kernel thread, don't signal it */
|
---|
172 | || p->pid == (unsigned)pid
|
---|
173 | || p->pid == 1
|
---|
174 | ) {
|
---|
175 | continue;
|
---|
176 | }
|
---|
177 |
|
---|
178 | /* All remaining args must be -o PID options.
|
---|
179 | * Check p->pid against them. */
|
---|
180 | args = argv;
|
---|
181 | while (*args) {
|
---|
182 | pid_t omit;
|
---|
183 |
|
---|
184 | arg = *args++;
|
---|
185 | if (arg[0] != '-' || arg[1] != 'o') {
|
---|
186 | bb_error_msg("bad option '%s'", arg);
|
---|
187 | ret = 1;
|
---|
188 | goto resume;
|
---|
189 | }
|
---|
190 | arg += 2;
|
---|
191 | if (!arg[0] && *args)
|
---|
192 | arg = *args++;
|
---|
193 | omit = bb_strtoi(arg, NULL, 10);
|
---|
194 | if (errno) {
|
---|
195 | bb_error_msg("invalid number '%s'", arg);
|
---|
196 | ret = 1;
|
---|
197 | goto resume;
|
---|
198 | }
|
---|
199 | if (p->pid == omit)
|
---|
200 | goto dont_kill;
|
---|
201 | }
|
---|
202 | kill(p->pid, signo);
|
---|
203 | ret = 0;
|
---|
204 | dont_kill: ;
|
---|
205 | }
|
---|
206 | resume:
|
---|
207 | /* And let them continue */
|
---|
208 | if (signo != SIGSTOP && signo != SIGCONT)
|
---|
209 | kill(-1, SIGCONT);
|
---|
210 | return ret;
|
---|
211 | }
|
---|
212 |
|
---|
213 | /* Pid or name is required for kill/killall */
|
---|
214 | if (!arg) {
|
---|
215 | bb_error_msg("you need to specify whom to kill");
|
---|
216 | return EXIT_FAILURE;
|
---|
217 | }
|
---|
218 |
|
---|
219 | if (killall) {
|
---|
220 | /* Looks like they want to do a killall. Do that */
|
---|
221 | do {
|
---|
222 | pid_t* pidList;
|
---|
223 |
|
---|
224 | pidList = find_pid_by_name(arg);
|
---|
225 | if (*pidList == 0) {
|
---|
226 | errors++;
|
---|
227 | if (!quiet)
|
---|
228 | bb_error_msg("%s: no process killed", arg);
|
---|
229 | } else {
|
---|
230 | pid_t *pl;
|
---|
231 |
|
---|
232 | for (pl = pidList; *pl; pl++) {
|
---|
233 | if (*pl == pid)
|
---|
234 | continue;
|
---|
235 | if (kill(*pl, signo) == 0)
|
---|
236 | continue;
|
---|
237 | errors++;
|
---|
238 | if (!quiet)
|
---|
239 | bb_perror_msg("can't kill pid %d", (int)*pl);
|
---|
240 | }
|
---|
241 | }
|
---|
242 | free(pidList);
|
---|
243 | arg = *++argv;
|
---|
244 | } while (arg);
|
---|
245 | return errors;
|
---|
246 | }
|
---|
247 |
|
---|
248 | /* Looks like they want to do a kill. Do that */
|
---|
249 | while (arg) {
|
---|
250 | #if ENABLE_ASH || ENABLE_HUSH
|
---|
251 | /*
|
---|
252 | * We need to support shell's "hack formats" of
|
---|
253 | * " -PRGP_ID" (yes, with a leading space)
|
---|
254 | * and " PID1 PID2 PID3" (with degenerate case "")
|
---|
255 | */
|
---|
256 | while (*arg != '\0') {
|
---|
257 | char *end;
|
---|
258 | if (*arg == ' ')
|
---|
259 | arg++;
|
---|
260 | pid = bb_strtoi(arg, &end, 10);
|
---|
261 | if (errno && (errno != EINVAL || *end != ' ')) {
|
---|
262 | bb_error_msg("invalid number '%s'", arg);
|
---|
263 | errors++;
|
---|
264 | break;
|
---|
265 | }
|
---|
266 | if (kill(pid, signo) != 0) {
|
---|
267 | bb_perror_msg("can't kill pid %d", (int)pid);
|
---|
268 | errors++;
|
---|
269 | }
|
---|
270 | arg = end; /* can only point to ' ' or '\0' now */
|
---|
271 | }
|
---|
272 | #else
|
---|
273 | pid = bb_strtoi(arg, NULL, 10);
|
---|
274 | if (errno) {
|
---|
275 | bb_error_msg("invalid number '%s'", arg);
|
---|
276 | errors++;
|
---|
277 | } else if (kill(pid, signo) != 0) {
|
---|
278 | bb_perror_msg("can't kill pid %d", (int)pid);
|
---|
279 | errors++;
|
---|
280 | }
|
---|
281 | #endif
|
---|
282 | arg = *++argv;
|
---|
283 | }
|
---|
284 | return errors;
|
---|
285 | }
|
---|