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Tests: Add tests for inheriting signal handlers

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Tim Schumacher 2022-07-05 01:45:16 +02:00 committed by Idan Horowitz
parent 67f352b824
commit 60fc0ceabb
Notes: sideshowbarker 2024-07-18 05:01:22 +09:00 
Author: https://github.com/timschumi
Commit: https://github.com/SerenityOS/serenity/commit/60fc0ceabb
Pull-request: https://github.com/SerenityOS/serenity/pull/14447
Reviewed-by: https://github.com/IdanHo ✅
Reviewed-by: https://github.com/alimpfard ✅
Reviewed-by: https://github.com/bgianfo
2 changed files with 79 additions and 0 deletions
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1
Tests/Kernel/CMakeLists.txt
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@ -43,6 +43,7 @@ set(LIBTEST_BASED_SOURCES
TestProcFS.cpp
TestProcFSWrite.cpp
TestSigAltStack.cpp
TestSigHandler.cpp
TestSigWait.cpp
)

78
Tests/Kernel/TestSigHandler.cpp Normal file
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@ -0,0 +1,78 @@
/*
* Copyright (c) 2022, Tim Schumacher <timschumi@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibTest/TestCase.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <unistd.h>
static void signal_handler(int)
{
VERIFY_NOT_REACHED();
}
TEST_CASE(default_handlers)
{
struct sigaction current_action { };
int rc = sigaction(SIGUSR2, nullptr, &current_action);
EXPECT_EQ(rc, 0);
EXPECT_EQ(current_action.sa_handler, SIG_DFL);
}
TEST_CASE(handlers_after_fork)
{
struct sigaction new_action {
{ signal_handler }, 0, 0
};
int rc = sigaction(SIGUSR2, &new_action, nullptr);
EXPECT_EQ(rc, 0);
pid_t pid = fork();
if (pid == 0) {
struct sigaction current_action { };
rc = sigaction(SIGUSR2, nullptr, &current_action);
EXPECT_EQ(rc, 0);
EXPECT_EQ(current_action.sa_handler, signal_handler);
exit(rc == 0 && current_action.sa_handler == signal_handler ? EXIT_SUCCESS : EXIT_FAILURE);
} else {
int exit_status = 0;
rc = waitpid(pid, &exit_status, 0);
EXPECT_EQ(rc, pid);
EXPECT(WIFEXITED(exit_status));
EXPECT_EQ(WEXITSTATUS(exit_status), 0);
}
}
TEST_CASE(handlers_after_exec)
{
struct sigaction new_action {
{ signal_handler }, 0, 0
};
int rc = sigaction(SIGUSR2, &new_action, nullptr);
EXPECT_EQ(rc, 0);
pid_t pid = fork();
if (pid == 0) {
// Hide the confusing "Running 1 cases out of 3" output.
freopen("/dev/null", "w", stdout);
// This runs the 'default_handlers' test in this binary again, but after exec.
execl("/proc/self/exe", "TestSigHandler", "default_handlers", nullptr);
FAIL("Failed to exec.");
} else {
int exit_status = 0;
rc = waitpid(pid, &exit_status, 0);
EXPECT_EQ(rc, pid);
EXPECT(WIFEXITED(exit_status));
EXPECT_EQ(WEXITSTATUS(exit_status), 0);
}
}