BSD 4_4_Lite2 release

[unix-history] / usr / src / bin / kill / kill.c

/*
* Copyright (c) 1988, 1993, 1994
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#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) 4/28/95";
#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);
}