/* $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 */
}
