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File: [cvs.NetBSD.org] / src / bin / kill / kill.c (download)

Revision 1.30, Wed Dec 12 20:22:43 2018 UTC (17 months, 3 weeks ago) by kre
Branch: MAIN
CVS Tags: phil-wifi-20200421, phil-wifi-20200411, phil-wifi-20200406, phil-wifi-20191119, phil-wifi-20190609, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, netbsd-9-base, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1, netbsd-9, is-mlppp-base, is-mlppp, HEAD
Changes since 1.29: +4 -2 lines

Reverse a decision made when the printsignals() routines from
kill and sh were merged so that the shell (for trap -l) and
kill (for kill -l) can use the same routine, and site that function
in the shell, rather than in kill (use the code that is in kill as
the basis for that routine).   This allows access to sh internals,
and in particular to the posix option, so the builtin kill can
operate in posix mode where the standard requires just a single
character (space of newline) between successive signal names (and
we prefer nicely aligned columns instead)..

In a SMALL shell, use the ancient sh printsignals routine instead,
it is smaller (and very much dumber).

/bin/kill still uses the routine that is in its source, and is
not posix compliant.   A task for some other day...

/* $NetBSD: kill.c,v 1.30 2018/12/12 20:22:43 kre 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\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)kill.c	8.4 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: kill.c,v 1.30 2018/12/12 20:22:43 kre Exp $");
#endif
#endif /* not lint */

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

#ifdef SHELL            /* sh (aka ash) builtin */
int killcmd(int, char *argv[]);
#define main killcmd
#include "../../bin/sh/bltin/bltin.h"
#endif /* SHELL */ 

__dead static void nosig(const char *);
void printsignals(FILE *, int);
static int signum(const char *);
static pid_t processnum(const char *);
__dead static void usage(void);

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

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

	numsig = SIGTERM;

	argc--, argv++;

	/*
	 * Process exactly 1 option, if there is one.
	 */
	if (argv[0][0] == '-') {
		switch (argv[0][1]) {
		case 'l':
			if (argv[0][2] != '\0')
				sn = argv[0] + 2;
			else {
				argc--; argv++;
				sn = argv[0];
			}
			if (argc > 1)
				usage();
			if (argc == 1) {
				if (isdigit((unsigned char)*sn) == 0)
					usage();
				numsig = signum(sn);
				if (numsig >= 128)
					numsig -= 128;
				if (numsig == 0 || signalnext(numsig) == -1)
					nosig(sn);
				sn = signalname(numsig);
				if (sn == NULL)
					errx(EXIT_FAILURE,
					   "unknown signal number: %d", numsig);
				printf("%s\n", sn);
				exit(0);
			}
			printsignals(stdout, 0);
			exit(0);

		case 's':
			if (argv[0][2] != '\0')
				sn = argv[0] + 2;
			else {
				argc--, argv++;
				if (argc < 1) {
					warnx(
					    "option requires an argument -- s");
					usage();
				}
				sn = argv[0];
			}
			if (strcmp(sn, "0") == 0)
				numsig = 0;
			else if ((numsig = signalnumber(sn)) == 0) {
				if (sn != argv[0])
					goto trysignal;
				nosig(sn);
			}
			argc--, argv++;
			break;

		case '-':
			if (argv[0][2] == '\0') {
				/* process this one again later */
				break;
			}
			/* FALL THROUGH */
		case '\0':
			usage();
			break;

		default:
 trysignal:
			sn = *argv + 1;
			if (((numsig = signalnumber(sn)) == 0)) {
				if (isdigit((unsigned char)*sn))
					numsig = signum(sn);
				else
					nosig(sn);
			}

			if (numsig != 0 && signalnext(numsig) == -1)
				nosig(sn);
			argc--, argv++;
			break;
		}
	}

	/* deal with the optional '--' end of options option */
	if (argc > 0 && strcmp(*argv, "--") == 0)
		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
			if ((pid = processnum(*argv)) == (pid_t)-1) {
				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'.
		 *	(kernel handles this for SIGKILL)
		 */
		if (numsig == SIGTERM || numsig == SIGHUP)
			kill(pid, SIGCONT);
#endif
	}

	exit(errors);
	/* NOTREACHED */
}

static int
signum(const char *sn)
{
	intmax_t n;
	char *ep;

	n = strtoimax(sn, &ep, 10);

	/* check for correctly parsed number */
	if (*ep || n <= INT_MIN || n >= INT_MAX )
		errx(EXIT_FAILURE, "illegal signal number: %s", sn);
		/* NOTREACHED */

	return (int)n;
}

static pid_t
processnum(const char *s)
{
	intmax_t n;
	char *ep;

	n = strtoimax(s, &ep, 10);

	/* check for correctly parsed number */
	if (*ep || n == INTMAX_MIN || n == INTMAX_MAX || (pid_t)n != n ||
	    n == -1) {
		warnx("illegal process%s id: %s", (n < 0 ? " group" : ""), s);
		n = -1;
	}

	return (pid_t)n;
}

static void
nosig(const char *name)
{

	warnx("unknown signal %s; valid signals:", name);
	printsignals(stderr, 0);
	exit(1);
	/* NOTREACHED */
}

#ifndef SHELL
/*
 * Print the names of all the signals (neatly) to fp
 * "len" gives the number of chars already printed to
 * the current output line (in kill.c, always 0)
 */
void
printsignals(FILE *fp, int len)
{
	int sig;
	int nl, pad;
	const char *name;
	int termwidth = 80;

	if ((name = getenv("COLUMNS")) != 0)
		termwidth = atoi(name);
	else if (isatty(fileno(fp))) {
		struct winsize win;

		if (ioctl(fileno(fp), TIOCGWINSZ, &win) == 0 && win.ws_col > 0)
			termwidth = win.ws_col;
	}

	pad = (len | 7) + 1 - len;

	for (sig = 0; (sig = signalnext(sig)) != 0; ) {
		name = signalname(sig);
		if (name == NULL)
			continue;

		nl = strlen(name);

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

		len += nl + pad;
		pad = (nl | 7) + 1 - nl;

		fprintf(fp, "%s", name);
	}
	if (len != 0)
		fprintf(fp, "\n");
}
#endif

static void
usage(void)
{
	const char *pn = getprogname();

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