xref: /csrg-svn/bin/kill/kill.c (revision 68983)

/*
 * Copyright (c) 1988, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1988, 1993, 1994\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)kill.c	8.4 (Berkeley) 04/28/95";
#endif /* not lint */

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void nosig __P((char *));
void printsignals __P((FILE *));
int signame_to_signum __P((char *));
void usage __P((void));

int
main(argc, argv)
	int argc;
	char *argv[];
{
	const char *const *p;
	int errors, numsig, pid;
	char *ep;

	if (argc < 2)
		usage();

	numsig = SIGTERM;

	argc--, argv++;
	if (!strcmp(*argv, "-l")) {
		argc--, argv++;
		if (argc > 1)
			usage();
		if (argc == 1) {
			if (!isdigit(**argv))
				usage();
			numsig = strtol(*argv, &ep, 10);
			if (!*argv || *ep)
				errx(1, "illegal signal number: %s", *argv);
			if (numsig >= 128)
				numsig -= 128;
			if (numsig <= 0 || numsig >= NSIG)
				nosig(*argv);
			printf("%s\n", sys_signame[numsig]);
			exit(0);
		}
		printsignals(stdout);
		exit(0);
	}

	if (!strcmp(*argv, "-s")) {
		argc--, argv++;
		if (argc < 1) {
			warnx("option requires an argument -- s");
			usage();
		}
		if (strcmp(*argv, "0")) {
			if ((numsig = signame_to_signum(*argv)) < 0)
				nosig(*argv);
		} else
			numsig = 0;
		argc--, argv++;
	} else if (**argv == '-') {
		++*argv;
		if (isalpha(**argv)) {
			if ((numsig = signame_to_signum(*argv)) < 0)
				nosig(*argv);
		} else if (isdigit(**argv)) {
			numsig = strtol(*argv, &ep, 10);
			if (!*argv || *ep)
				errx(1, "illegal signal number: %s", *argv);
			if (numsig <= 0 || numsig >= NSIG)
				nosig(*argv);
		} else
			nosig(*argv);
		argc--, argv++;
	}

	if (argc == 0)
		usage();

	for (errors = 0; argc; argc--, argv++) {
		pid = strtol(*argv, &ep, 10);
		if (!*argv || *ep) {
			warnx("illegal process id: %s", *argv);
			errors = 1;
		} else if (kill(pid, numsig) == -1) {
			warn("%s", *argv);
			errors = 1;
		}
	}

	exit(errors);
}

int
signame_to_signum(sig)
	char *sig;
{
	int n;

	if (!strncasecmp(sig, "sig", 3))
		sig += 3;
	for (n = 1; n < NSIG; n++) {
		if (!strcasecmp(sys_signame[n], sig))
			return (n);
	}
	return (-1);
}

void
nosig(name)
	char *name;
{

	warnx("unknown signal %s; valid signals:", name);
	printsignals(stderr);
	exit(1);
}

void
printsignals(fp)
	FILE *fp;
{
	int n;

	for (n = 1; n < NSIG; n++) {
		(void)fprintf(fp, "%s", sys_signame[n]);
		if (n == (NSIG / 2) || n == (NSIG - 1))
			(void)fprintf(fp, "\n");
		else
			(void)fprintf(fp, " ");
	}
}

void
usage()
{

	(void)fprintf(stderr, "usage: kill [-s signal_name] pid ...\n");
	(void)fprintf(stderr, "       kill -l [exit_status]\n");
	(void)fprintf(stderr, "       kill -signal_name pid ...\n");
	(void)fprintf(stderr, "       kill -signal_number pid ...\n");
	exit(1);
}