1/* $NetBSD: kill.c,v 1.27 2011/08/29 14:51:18 joerg Exp $ */
2
3/*
4 * Copyright (c) 1988, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if !defined(lint) && !defined(SHELL)
34__COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\
35 The Regents of the University of California.  All rights reserved.");
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)kill.c	8.4 (Berkeley) 4/28/95";
41#else
42__RCSID("$NetBSD: kill.c,v 1.27 2011/08/29 14:51:18 joerg Exp $");
43#endif
44#endif /* not lint */
45
46#include <ctype.h>
47#include <err.h>
48#include <errno.h>
49#include <signal.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <limits.h>
53#include <inttypes.h>
54#include <string.h>
55#include <termios.h>
56#include <unistd.h>
57#include <locale.h>
58#include <sys/ioctl.h>
59
60#ifdef SHELL            /* sh (aka ash) builtin */
61int killcmd(int, char *argv[]);
62#define main killcmd
63#include "../../bin/sh/bltin/bltin.h"
64#endif /* SHELL */
65
66__dead static void nosig(char *);
67static void printsignals(FILE *);
68static int signame_to_signum(char *);
69__dead static void usage(void);
70
71int
72main(int argc, char *argv[])
73{
74	int errors;
75	intmax_t numsig, pid;
76	char *ep;
77
78	setprogname(argv[0]);
79	setlocale(LC_ALL, "");
80	if (argc < 2)
81		usage();
82
83	numsig = SIGTERM;
84
85	argc--, argv++;
86	if (strcmp(*argv, "-l") == 0) {
87		argc--, argv++;
88		if (argc > 1)
89			usage();
90		if (argc == 1) {
91			if (isdigit((unsigned char)**argv) == 0)
92				usage();
93			numsig = strtoimax(*argv, &ep, 10);
94			/* check for correctly parsed number */
95			if (*ep != '\0' || numsig == INTMAX_MIN || numsig == INTMAX_MAX) {
96				errx(EXIT_FAILURE, "illegal signal number: %s",
97						*argv);
98				/* NOTREACHED */
99			}
100			if (numsig >= 128)
101				numsig -= 128;
102			/* and whether it fits into signals range */
103			if (numsig <= 0 || numsig >= NSIG)
104				nosig(*argv);
105			printf("%s\n", sys_signame[(int) numsig]);
106			exit(0);
107		}
108		printsignals(stdout);
109		exit(0);
110	}
111
112	if (!strcmp(*argv, "-s")) {
113		argc--, argv++;
114		if (argc < 1) {
115			warnx("option requires an argument -- s");
116			usage();
117		}
118		if (strcmp(*argv, "0")) {
119			if ((numsig = signame_to_signum(*argv)) < 0)
120				nosig(*argv);
121		} else
122			numsig = 0;
123		argc--, argv++;
124	} else if (**argv == '-') {
125		char *sn = *argv + 1;
126		if (isalpha((unsigned char)*sn)) {
127			if ((numsig = signame_to_signum(sn)) < 0)
128				nosig(sn);
129		} else if (isdigit((unsigned char)*sn)) {
130			numsig = strtoimax(sn, &ep, 10);
131			/* check for correctly parsed number */
132			if (*ep || numsig == INTMAX_MIN || numsig == INTMAX_MAX ) {
133				errx(EXIT_FAILURE, "illegal signal number: %s",
134						sn);
135				/* NOTREACHED */
136			}
137			/* and whether it fits into signals range */
138			if (numsig < 0 || numsig >= NSIG)
139				nosig(sn);
140		} else
141			nosig(sn);
142		argc--, argv++;
143	}
144
145	if (argc == 0)
146		usage();
147
148	for (errors = 0; argc; argc--, argv++) {
149#ifdef SHELL
150		extern int getjobpgrp(const char *);
151		if (*argv[0] == '%') {
152			pid = getjobpgrp(*argv);
153			if (pid == 0) {
154				warnx("illegal job id: %s", *argv);
155				errors = 1;
156				continue;
157			}
158		} else
159#endif
160		{
161			pid = strtoimax(*argv, &ep, 10);
162			/* make sure the pid is a number and fits into pid_t */
163			if (!**argv || *ep || pid == INTMAX_MIN ||
164				pid == INTMAX_MAX || pid != (pid_t) pid) {
165
166				warnx("illegal process id: %s", *argv);
167				errors = 1;
168				continue;
169			}
170		}
171		if (kill((pid_t) pid, (int) numsig) == -1) {
172			warn("%s", *argv);
173			errors = 1;
174		}
175#ifdef SHELL
176		/* Wakeup the process if it was suspended, so it can
177		   exit without an explicit 'fg'. */
178		if (numsig == SIGTERM || numsig == SIGHUP)
179			kill((pid_t) pid, SIGCONT);
180#endif
181	}
182
183	exit(errors);
184	/* NOTREACHED */
185}
186
187static int
188signame_to_signum(char *sig)
189{
190	int n;
191
192	if (strncasecmp(sig, "sig", 3) == 0)
193		sig += 3;
194	for (n = 1; n < NSIG; n++) {
195		if (!strcasecmp(sys_signame[n], sig))
196			return (n);
197	}
198	return (-1);
199}
200
201static void
202nosig(char *name)
203{
204
205	warnx("unknown signal %s; valid signals:", name);
206	printsignals(stderr);
207	exit(1);
208	/* NOTREACHED */
209}
210
211static void
212printsignals(FILE *fp)
213{
214	int sig;
215	int len, nl;
216	const char *name;
217	int termwidth = 80;
218
219	if (isatty(fileno(fp))) {
220		struct winsize win;
221		if (ioctl(fileno(fp), TIOCGWINSZ, &win) == 0 && win.ws_col > 0)
222			termwidth = win.ws_col;
223	}
224
225	for (len = 0, sig = 1; sig < NSIG; sig++) {
226		name = sys_signame[sig];
227		nl = 1 + strlen(name);
228
229		if (len + nl >= termwidth) {
230			fprintf(fp, "\n");
231			len = 0;
232		} else
233			if (len != 0)
234				fprintf(fp, " ");
235		len += nl;
236		fprintf(fp, "%s", name);
237	}
238	if (len != 0)
239		fprintf(fp, "\n");
240}
241
242static void
243usage(void)
244{
245
246	fprintf(stderr, "usage: %s [-s signal_name] pid ...\n"
247	    "       %s -l [exit_status]\n"
248	    "       %s -signal_name pid ...\n"
249	    "       %s -signal_number pid ...\n",
250	    getprogname(), getprogname(), getprogname(), getprogname());
251	exit(1);
252	/* NOTREACHED */
253}
254