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/*
** Copyright 1998 - 2020 Double Precision, Inc.
** See COPYING for distribution information.
*/
#include "waitlib.h"
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <pthread.h>
/* Stress test waitlib.c */
#define NUMCHILDREN 100 /* Start 100 child processes */
#define INITCHILDREN 10 /* Start with these many child procs */
static unsigned started;
static int reap_pipefd[2];
static void reap_child(pid_t p, int dummy)
{
if (write(reap_pipefd[1], "", 1) < 0)
; /* shut up gcc */
}
static void sighandler(int sig)
{
wait_reap(&reap_child, &sighandler);
}
static pid_t start_child()
{
pid_t p;
wait_block();
while ((p=fork()) == (pid_t)-1)
{
perror("fork");
sleep(3);
}
++started;
if (p == 0)
{
wait_restore();
}
else
wait_clear(&sighandler);
return (p);
}
extern void foobar();
int main()
{
int pipefd[2];
int pipefd2[2];
char c;
unsigned finished=0;
if (pipe(reap_pipefd) || pipe(pipefd) || pipe(pipefd2))
{
perror("pipe");
exit(1);
}
signal(SIGCHLD, sighandler);
started=0;
while (started < INITCHILDREN)
{
if (start_child() == 0)
{
close(pipefd2[0]);
close(pipefd2[1]);
close(pipefd[1]);
if (read(pipefd[0], &c, 1) != 1)
; /* Shut gcc up */
close(pipefd[0]);
_exit(0);
}
}
close(pipefd2[1]);
close(pipefd[0]);
if (read(pipefd2[0], &c, 1) != 1)
; /* Shut gcc up */
close(pipefd[1]);
close(pipefd2[0]);
while (started < NUMCHILDREN)
if (start_child() == 0)
_exit(0);
alarm(30);
while (finished < started)
{
char c;
int n=read(reap_pipefd[0], &c, 1);
if (n <= 0)
{
fprintf(stderr, "pipe error\n");
exit(1);
}
++finished;
}
exit(0);
}
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