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