source: trunk/ash/bltin/kill.c

/* $NetBSD: kill.c,v 1.23 2003/08/07 09:05:13 agc Exp $ */

/*
 * 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. 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.
 */

#include <sys/cdefs.h>
#if !defined(lint) && !defined(SHELL)
__COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\n\
        The Regents of the University of California.  All rights reserved.\n");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)kill.c      8.4 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: kill.c,v 1.23 2003/08/07 09:05:13 agc Exp $");
#endif
#endif /* not lint */

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <locale.h>
#include <sys/ioctl.h>

#ifdef SHELL            /* sh (aka ash) builtin */
#define main killcmd
#include "bltin/bltin.h"
#endif /* SHELL */

static void nosig(char *);
static void printsignals(FILE *);
static int signame_to_signum(char *);
static void usage(void);
int main(int, char *[]);

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

        setprogname(argv[0]);
        setlocale(LC_ALL, "");
        if (argc < 2)
                usage();

        numsig = SIGTERM;

        argc--, argv++;
        if (strcmp(*argv, "-l") == 0) {
                argc--, argv++;
                if (argc > 1)
                        usage();
                if (argc == 1) {
                        if (isdigit((unsigned char)**argv) == 0)
                                usage();
                        numsig = strtol(*argv, &ep, 10);
                        if (*ep != '\0') {
                                errx(EXIT_FAILURE, "illegal signal number: %s",
                                                *argv);
                                /* NOTREACHED */
                        }
                        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((unsigned char)**argv)) {
                        if ((numsig = signame_to_signum(*argv)) < 0)
                                nosig(*argv);
                } else if (isdigit((unsigned char)**argv)) {
                        numsig = strtol(*argv, &ep, 10);
                        if (!*argv || *ep) {
                                errx(EXIT_FAILURE, "illegal signal number: %s",
                                                *argv);
                                /* NOTREACHED */
                        }
                        if (numsig < 0 || numsig >= NSIG)
                                nosig(*argv);
                } else
                        nosig(*argv);
                argc--, argv++;
        }

        if (argc == 0)
                usage();

        for (errors = 0; argc; argc--, argv++) {
#ifdef SHELL
                extern int getjobpgrp(const char *);
                if (*argv[0] == '%') {
                        pid = getjobpgrp(*argv);
                        if (pid == 0) {
                                warnx("illegal job id: %s", *argv);
                                errors = 1;
                                continue;
                        }
                } else
#endif
                {
                        pid = strtol(*argv, &ep, 10);
                        if (!**argv || *ep) {
                                warnx("illegal process id: %s", *argv);
                                errors = 1;
                                continue;
                        }
                }
                if (kill(pid, numsig) == -1) {
                        warn("%s", *argv);
                        errors = 1;
                }
#ifdef SHELL
                /* Wakeup the process if it was suspended, so it can
                   exit without an explicit 'fg'. */
                if (numsig == SIGTERM || numsig == SIGHUP)
                        kill(pid, SIGCONT);
#endif
        }

        exit(errors);
        /* NOTREACHED */
}

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

        if (strncasecmp(sig, "sig", 3) == 0)
                sig += 3;
        for (n = 1; n < NSIG; n++) {
                if (!strcasecmp(sys_signame[n], sig))
                        return (n);
        }
        return (-1);
}

static void
nosig(char *name)
{

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

static void
printsignals(FILE *fp)
{
        int sig;
        int len, nl;
        const char *name;
        int termwidth = 80;

#ifdef TIOCGWINSZ
        if (isatty(fileno(fp))) {
                struct winsize win;
                if (ioctl(fileno(fp), TIOCGWINSZ, &win) == 0 && win.ws_col > 0)
                        termwidth = win.ws_col;
        }
#else
#warning TIOCGWINSZ is not present.
#endif

        for (len = 0, sig = 1; sig < NSIG; sig++) {
                name = sys_signame[sig];
                nl = 1 + strlen(name);

                if (len + nl >= termwidth) {
                        fprintf(fp, "\n");
                        len = 0;
                } else
                        if (len != 0)
                                fprintf(fp, " ");
                len += nl;
                fprintf(fp, "%s", name);
        }
        if (len != 0)
                fprintf(fp, "\n");
}

static void
usage(void)
{

        fprintf(stderr, "usage: %s [-s signal_name] pid ...\n"
            "       %s -l [exit_status]\n"
            "       %s -signal_name pid ...\n"
            "       %s -signal_number pid ...\n",
            getprogname(), getprogname(), getprogname(), getprogname());
        exit(1);
        /* NOTREACHED */
}