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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2008-2009. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/* Used by test case otp_7461 to spawn a child process with a given
* command line. Child process group is killed by order received on stdin.
*
* Author: Sverker Eriksson
*/
#if defined (__WIN32__) || defined(VXWORKS)
int main() {return 0;}
#else /* UNIX only */
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#define TRY(cmd) if ((cmd) < 0) bail_out(#cmd " failed")
static void bail_out(const char* msg)
{
perror(msg);
exit(-1);
}
static void alarm_handler(int signo)
{
fprintf(stderr, __FILE__" self terminating after timeout\n");
exit(1);
}
int main(int argc, char* argv[])
{
pid_t child;
int ret;
char cmd;
int child_exit;
if (argc < 2) {
fprintf(stderr, "Must specify command to run in background\n");
exit(-1);
}
TRY(child=fork());
if (child == 0) { /* child */
pid_t gchild;
TRY(setpgid(getpid(), getpid())); /* create process group */
TRY(gchild=fork());
if (gchild == 0) { /* grandchild */
TRY(execvp(argv[1],&argv[1]));
}
exit(0);
}
/* parent */
signal(SIGALRM, alarm_handler);
alarm(10*60); /* suicide in case nothing happens */
TRY(wait(&child_exit));
if (!WIFEXITED(child_exit) || WEXITSTATUS(child_exit)!=0) {
fprintf(stderr, "child did not exit normally (status=%d)\n", child_exit);
exit(-1);
}
for (;;)
{
TRY(ret=read(STDIN_FILENO, &cmd, 1));
if (ret == 0) break; /* eof -> exit */
switch (cmd)
{
case 'K':
ret = kill(-child, SIGINT); /* child process _group_ */
if (ret < 0 && errno != ESRCH) {
bail_out("kill failed");
}
write(STDOUT_FILENO, &cmd, 1); /* echo ack */
break;
case '\n':
break;/* ignore (for interactive testing) */
default:
fprintf(stderr, "Unknown command '%c'\n", cmd);
exit(-1);
}
}
return 0;
}
#endif /* UNIX */
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