source: MondoRescue/branches/3.3/mindi-busybox/procps/kill.c@ 3621

Last change on this file since 3621 was 3621, checked in by Bruno Cornec, 7 years ago

New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
File size: 7.3 KB
Line 
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
63int 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}
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