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kill.c
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kill.c
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/* Copyright (c) 2017, Piotr Durlej
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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 <signal.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <err.h>
static void psignums(void)
{
printf(" Signal names and their numbers:\n\n"
" SIGHUP ..... 1 SIGSEGV .... 11\n"
" SIGINT ..... 2 SIGCONT .... 12\n"
" SIGQUIT .... 3 SIGPIPE .... 13\n"
" SIGILL ..... 4 SIGALRM .... 14\n"
" SIGTRAP .... 5 SIGTERM .... 15\n"
" SIGABRT .... 6 SIGUSR1 .... 16\n"
" SIGBUS ..... 7 SIGUSR2 .... 17\n"
" SIGFPE ..... 8 SIGCHLD .... 18\n"
" SIGKILL .... 9 SIGPWR ..... 19\n"
" SIGSTOP .... 10 SIGEVT ..... 29\n"
" SIGEXEC .... 30 SIGSTK ..... 31\n"
" SIGOOM ..... 32\n\n");
}
int main(int argc, char **argv)
{
int sig = SIGTERM;
int err = 0;
int i = 1;
if (argc == 2)
{
if (!strcmp(argv[1], "--help"))
{
printf("\nUsage: kill [-SIG] PID...\n"
"Kill PID with signal SIG\n\n"
" Default signal is 15\n");
psignums();
return 0;
}
if (!strcmp(argv[1], "-l"))
{
psignums();
return 0;
}
}
if (argc < 2)
errx(255, "too few arguments");
if (argc > 2 && *argv[i] == '-')
{
sig = atoi(argv[i] + 1);
i++;
}
for (; i < argc; i++)
if (kill(atoi(argv[i]), sig))
{
if (!err)
err = errno;
perror(argv[i]);
}
return err;
}