source: branches/3.2/mindi-busybox/procps/kill.c @ 3232

Last change on this file since 3232 was 3232, checked in by Bruno Cornec, 7 years ago
  • Update mindi-busybox to 1.21.1
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, 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    argc--;
83    arg = *++argv;
84
85    if (argc < 1 || arg[0] != '-') {
86        goto do_it_now;
87    }
88
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') {
94        if (argc == 1) {
95            /* Print the whole signal list */
96            print_signames();
97            return 0;
98        }
99        /* -l <sig list> */
100        while ((arg = *++argv)) {
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        }
122        /* If they specified -l, we are all done */
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        argc--;
131        if (argc < 1)
132            bb_show_usage();
133        if (arg[0] != '-')
134            goto do_it_now;
135    }
136
137    arg++; /* skip '-' */
138
139    /* -o PID? (if present, it always is at the end of command line) */
140    if (killall5 && arg[0] == 'o')
141        goto do_it_now;
142
143    if (argc > 1 && arg[0] == 's' && arg[1] == '\0') { /* -s SIG? */
144        argc--;
145        arg = *++argv;
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);
150        return EXIT_FAILURE;
151    }
152    arg = *++argv;
153    argc--;
154
155 do_it_now:
156    pid = getpid();
157
158    if (killall5) {
159        pid_t sid;
160        procps_status_t* p = NULL;
161        int ret = 0;
162
163        /* Find out our session id */
164        sid = getsid(pid);
165        /* Stop all processes */
166        if (signo != SIGSTOP && signo != SIGCONT)
167            kill(-1, SIGSTOP);
168        /* Signal all processes except those in our session */
169        while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_SID)) != NULL) {
170            int i;
171
172            if (p->sid == (unsigned)sid
173             || p->pid == (unsigned)pid
174             || p->pid == 1
175            ) {
176                continue;
177            }
178
179            /* All remaining args must be -o PID options.
180             * Check p->pid against them. */
181            for (i = 0; i < argc; i++) {
182                pid_t omit;
183
184                arg = argv[i];
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] && argv[++i])
192                    arg = argv[i];
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 dont_kill: ;
204        }
205 resume:
206        /* And let them continue */
207        if (signo != SIGSTOP && signo != SIGCONT)
208            kill(-1, SIGCONT);
209        return ret;
210    }
211
212    /* Pid or name is required for kill/killall */
213    if (argc < 1) {
214        bb_error_msg("you need to specify whom to kill");
215        return EXIT_FAILURE;
216    }
217
218    if (killall) {
219        /* Looks like they want to do a killall.  Do that */
220        while (arg) {
221            pid_t* pidList;
222
223            pidList = find_pid_by_name(arg);
224            if (*pidList == 0) {
225                errors++;
226                if (!quiet)
227                    bb_error_msg("%s: no process killed", arg);
228            } else {
229                pid_t *pl;
230
231                for (pl = pidList; *pl; pl++) {
232                    if (*pl == pid)
233                        continue;
234                    if (kill(*pl, signo) == 0)
235                        continue;
236                    errors++;
237                    if (!quiet)
238                        bb_perror_msg("can't kill pid %d", (int)*pl);
239                }
240            }
241            free(pidList);
242            arg = *++argv;
243        }
244        return errors;
245    }
246
247    /* Looks like they want to do a kill. Do that */
248    while (arg) {
249#if ENABLE_ASH || ENABLE_HUSH
250        /*
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 "")
254         */
255        while (*arg != '\0') {
256            char *end;
257            if (*arg == ' ')
258                arg++;
259            pid = bb_strtoi(arg, &end, 10);
260            if (errno && (errno != EINVAL || *end != ' ')) {
261                bb_error_msg("invalid number '%s'", arg);
262                errors++;
263                break;
264            }
265            if (kill(pid, signo) != 0) {
266                bb_perror_msg("can't kill pid %d", (int)pid);
267                errors++;
268            }
269            arg = end; /* can only point to ' ' or '\0' now */
270        }
271#else
272        pid = bb_strtoi(arg, NULL, 10);
273        if (errno) {
274            bb_error_msg("invalid number '%s'", arg);
275            errors++;
276        } else if (kill(pid, signo) != 0) {
277            bb_perror_msg("can't kill pid %d", (int)pid);
278            errors++;
279        }
280#endif
281        arg = *++argv;
282    }
283    return errors;
284}
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