From cf390d6a524a58982827ca556acabd2503e9fb44 Mon Sep 17 00:00:00 2001
From: 4lDO2 <4lDO2@protonmail.com>
Date: Thu, 4 Jul 2024 11:24:23 +0200
Subject: [PATCH] Add SIGCHLD test.
---
tests/Makefile | 1 +
tests/sigchld.c | 105 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 106 insertions(+)
create mode 100644 tests/sigchld.c
diff --git a/tests/Makefile b/tests/Makefile
index 46690fd8..bb3ab909 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -30,6 +30,7 @@ EXPECT_NAMES=\
select \
setjmp \
sigaction \
+ sigchld \
signal \
stdio/all \
stdio/buffer \
diff --git a/tests/sigchld.c b/tests/sigchld.c
new file mode 100644
index 00000000..5e8a9ce2
--- /dev/null
+++ b/tests/sigchld.c
@@ -0,0 +1,105 @@
+#include <assert.h>
+#include <errno.h>
+#include <signal.h>
+#include <sched.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "test_helpers.h"
+
+volatile sig_atomic_t atomic = 0;
+volatile sig_atomic_t atomic2 = 0;
+
+void action(int sig, siginfo_t *info, void *context) {
+ (void)context;
+
+ assert(sig == SIGCHLD);
+ assert(info != NULL);
+ atomic += 1;
+}
+void handler(int sig) {
+ assert(sig == SIGPIPE);
+ atomic2 += 1;
+}
+
+int main(void) {
+ int child = fork();
+ ERROR_IF(fork, child, == -1);
+
+ int fds[2];
+ int status = pipe(fds);
+ ERROR_IF(pipe, status, == -1);
+
+ struct sigaction sa;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = 0;
+ sa.sa_sigaction = action;
+ status = sigaction(SIGCHLD, &sa, NULL);
+ ERROR_IF(sigaction, status, == -1);
+
+ sa.sa_handler = handler;
+ status = sigaction(SIGPIPE, &sa, NULL);
+ ERROR_IF(sigaction, status, == -1);
+
+ if (child == 0) {
+ status = close(fds[1]);
+ ERROR_IF(close, status, == -1);
+
+ char buf[1];
+ status = read(fds[0], buf, 1);
+ ERROR_IF(read, status, == -1);
+ puts("Child exiting.");
+ return EXIT_SUCCESS;
+ } else {
+ int waitpid_stat;
+
+ close(fds[0]);
+ ERROR_IF(close, status, == -1);
+
+ puts("Sending SIGSTOP...");
+ status = kill(child, SIGSTOP);
+ ERROR_IF(kill, status, == -1);
+
+ while (atomic == 0) {
+ status = sched_yield();
+ ERROR_IF(sched_yield, status, == -1);
+ }
+ puts("First handler ran, checking status.");
+
+ status = waitpid(child, &waitpid_stat, WUNTRACED);
+ ERROR_IF(waitpid, status, == -1);
+ assert(WIFSTOPPED(waitpid_stat));
+ assert(WSTOPSIG(waitpid_stat) == SIGSTOP);
+ puts("Correct, sending SIGCONT...");
+
+ status = kill(child, SIGCONT);
+ ERROR_IF(kill, status, == -1);
+
+ while (atomic == 1) {
+ status = sched_yield();
+ ERROR_IF(sched_yield, status, == -1);
+ }
+ puts("Second handler ran, checking status.");
+
+ status = waitpid(child, &waitpid_stat, 0);
+ ERROR_IF(waitpid, status, == -1);
+ assert(WIFEXITED(waitpid_stat));
+ assert(WEXITSTATUS(waitpid_stat) == 0);
+ puts("Child exited.");
+
+ puts("Writing to (broken) pipe.");
+ status = write(fds[1], "C", 1);
+ ERROR_IF(write, status, != -1);
+ assert(errno == EPIPE);
+
+ while (atomic2 == 0) {
+ status = sched_yield();
+ ERROR_IF(sched_yield, status, == -1);
+ }
+ puts("SIGSTOP handler successfully executed.");
+ return EXIT_SUCCESS;
+ }
+}
--
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