99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
/* This testcase is part of GDB, the GNU debugger.
|
|
|
|
Copyright 2016-2020 Free Software Foundation, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <assert.h>
|
|
#include <sys/wait.h>
|
|
|
|
int fds[2] = { -1, -1 };
|
|
|
|
static void
|
|
grandparent_done (void)
|
|
{
|
|
}
|
|
|
|
/* The exp file overrides this in order to test both fork and
|
|
vfork. */
|
|
#ifndef FORK
|
|
#define FORK fork
|
|
#endif
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
int pid;
|
|
int nbytes;
|
|
const char string[] = "Hello, world!\n";
|
|
char readbuffer[80];
|
|
|
|
/* Don't run forever. */
|
|
alarm (300);
|
|
|
|
/* Create a pipe. The write side will be inherited all the way to
|
|
the grandchild. The grandparent will read this, expecting to see
|
|
EOF (meaning the grandchild closed the pipe). */
|
|
pipe (fds);
|
|
|
|
pid = FORK ();
|
|
if (pid < 0)
|
|
{
|
|
perror ("fork");
|
|
exit (1);
|
|
}
|
|
else if (pid == 0)
|
|
{
|
|
/* Close input side of pipe. */
|
|
close (fds[0]);
|
|
|
|
pid = FORK ();
|
|
if (pid == 0)
|
|
{
|
|
printf ("I'm the grandchild!\n");
|
|
|
|
/* Don't explicitly close the pipe. If GDB fails to kill
|
|
this process, then the grandparent will hang in the pipe
|
|
read below. */
|
|
#if 0
|
|
close (fds[1]);
|
|
#endif
|
|
while (1)
|
|
sleep (1);
|
|
}
|
|
else
|
|
{
|
|
close (fds[1]);
|
|
printf ("I'm the proud parent of child #%d!\n", pid);
|
|
wait (NULL);
|
|
}
|
|
}
|
|
else if (pid > 0)
|
|
{
|
|
close (fds[1]);
|
|
printf ("I'm the proud parent of child #%d!\n", pid);
|
|
nbytes = read (fds[0], readbuffer, sizeof (readbuffer));
|
|
assert (nbytes == 0);
|
|
printf ("read returned nbytes=%d\n", nbytes);
|
|
wait (NULL);
|
|
|
|
grandparent_done ();
|
|
}
|
|
|
|
return 0;
|
|
}
|