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/*
* Test GDB's follow-fork-mode.
*
* fork() a chain of processes.
* Parents sends one byte to their children, and children return their
* position in the chain, in order to prove that they survived GDB's fork()
* handling.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <assert.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <unistd.h>
void break_after_fork(void)
{
}
int main(void)
{
int depth = 42, err, i, fd[2], status;
pid_t child, pid;
ssize_t n;
char b;
for (i = 0; i < depth; i++) {
err = pipe(fd);
assert(err == 0);
child = fork();
break_after_fork();
assert(child != -1);
if (child == 0) {
close(fd[1]);
n = read(fd[0], &b, 1);
close(fd[0]);
assert(n == 1);
assert(b == (char)i);
} else {
close(fd[0]);
b = (char)i;
n = write(fd[1], &b, 1);
close(fd[1]);
assert(n == 1);
pid = waitpid(child, &status, 0);
assert(pid == child);
assert(WIFEXITED(status));
return WEXITSTATUS(status) - 1;
}
}
return depth;
}
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