aboutsummaryrefslogtreecommitdiff
path: root/procps/kill.c
blob: 5b167326f038f10a0def58530ef68723304bdd5a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/* vi: set sw=4 ts=4: */
/*
 * Mini kill/killall implementation for busybox
 *
 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
 */

#include "busybox.h"

int kill_main(int argc, char **argv)
{
	char *arg;
	pid_t pid;
	int signo = SIGTERM, errors = 0, quiet = 0;
	const int killall = (ENABLE_KILLALL && applet_name[4] == 'a'
	               && (!ENABLE_KILLALL5 || applet_name[7] != '5'));
	const int killall5 = (ENABLE_KILLALL5 && applet_name[4] == 'a'
	                  && (!ENABLE_KILLALL || applet_name[7] == '5'));

	/* Parse any options */
	argc--;
	arg = *++argv;

	if (argc < 1 || arg[0] != '-') {
		goto do_it_now;
	}

	/* The -l option, which prints out signal names. */
	if (arg[1] == 'l' && arg[2] == '\0') {
		const char *name;
		if (argc == 1) {
			/* Print the whole signal list */
			int col = 0;
			for (signo = 1; signo < 32; signo++) {
				name = get_signame(signo);
				if (isdigit(name[0])) continue;
				if (col > 66) {
					puts("");
					col = 0;
				}
				col += printf("%2d) %-6s", signo, name);
			}
			puts("");
		} else { /* -l <sig list> */
			while ((arg = *++argv)) {
				if (isdigit(arg[0])) {
					signo = xatoi_u(arg);
					name = get_signame(signo);
				} else {
					signo = get_signum(arg);
					if (signo < 0)
						bb_error_msg_and_die("unknown signal '%s'", arg);
					name = get_signame(signo);
				}
				printf("%2d) %s\n", signo, name);
			}
		}
		/* If they specified -l, we are all done */
		return EXIT_SUCCESS;
	}

	/* The -q quiet option */
	if (killall && arg[1] == 'q' && arg[2] == '\0') {
		quiet = 1;
		arg = *++argv;
		argc--;
		if (argc < 1) bb_show_usage();
		if (arg[0] != '-') goto do_it_now;
	}

	/* -SIG */
	signo = get_signum(&arg[1]);
	if (signo < 0)
		bb_error_msg_and_die("bad signal name '%s'", &arg[1]);
	arg = *++argv;
	argc--;

do_it_now:

	if (killall5) {
		pid_t sid;
		procps_status_t* p = NULL;

// Cannot happen anyway? We don't TERM ourself, we STOP
//		/* kill(-1, sig) on Linux (at least 2.1.x)
//		 * might send signal to the calling process too */
//		signal(SIGTERM, SIG_IGN);
		/* Now stop all processes */
		kill(-1, SIGSTOP);
		/* Find out our own session id */
		pid = getpid();
		sid = getsid(pid);
		/* Now kill all processes except our session */
		while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_SID))) {
			if (p->sid != sid && p->pid != pid && p->pid != 1)
				kill(p->pid, signo);
		}
		/* And let them continue */
		kill(-1, SIGCONT);
		return 0;
	}

	/* Pid or name required for kill/killall */
	if (argc < 1)
		bb_show_usage();

	if (killall) {
		/* Looks like they want to do a killall.  Do that */
		pid = getpid();
		while (arg) {
			pid_t* pidList;

			pidList = find_pid_by_name(arg);
			if (*pidList == 0) {
				errors++;
				if (!quiet)
					bb_error_msg("%s: no process killed", arg);
			} else {
				pid_t *pl;

				for (pl = pidList; *pl; pl++) {
					if (*pl == pid)
						continue;
					if (kill(*pl, signo) == 0)
						continue;
					errors++;
					if (!quiet)
						bb_perror_msg("cannot kill pid %u", (unsigned)*pl);
				}
			}
			free(pidList);
			arg = *++argv;
		}
		return errors;
	}

	/* Looks like they want to do a kill. Do that */
	while (arg) {
		/* Huh?
		if (!isdigit(arg[0]) && arg[0] != '-')
			bb_error_msg_and_die("bad pid '%s'", arg);
		*/
		pid = xatou(arg);
		/* FIXME: better overflow check? */
		if (kill(pid, signo) != 0) {
			bb_perror_msg("cannot kill pid %u", (unsigned)pid);
			errors++;
		}
		arg = *++argv;
	}
	return errors;
}