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[PATCH v2 4/4] tests/tcg/linux-test: Add linux-fork-trap test
From: |
Ilya Leoshkevich |
Subject: |
[PATCH v2 4/4] tests/tcg/linux-test: Add linux-fork-trap test |
Date: |
Mon, 13 Feb 2023 13:52:37 +0100 |
Check that dying due to a signal does not deadlock.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
tests/tcg/multiarch/linux/linux-fork-trap.c | 48 +++++++++++++++++++++
1 file changed, 48 insertions(+)
create mode 100644 tests/tcg/multiarch/linux/linux-fork-trap.c
diff --git a/tests/tcg/multiarch/linux/linux-fork-trap.c
b/tests/tcg/multiarch/linux/linux-fork-trap.c
new file mode 100644
index 00000000000..a921f875380
--- /dev/null
+++ b/tests/tcg/multiarch/linux/linux-fork-trap.c
@@ -0,0 +1,48 @@
+/*
+ * Test that a fork()ed process terminates after __builtin_trap().
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include <assert.h>
+#include <stdlib.h>
+#include <sys/resource.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+int main(void)
+{
+ struct rlimit nodump;
+ pid_t err, pid;
+ int wstatus;
+
+ pid = fork();
+ assert(pid != -1);
+ if (pid == 0) {
+ /* We are about to crash on purpose; disable core dumps. */
+ if (getrlimit(RLIMIT_CORE, &nodump)) {
+ return EXIT_FAILURE;
+ }
+ nodump.rlim_cur = 0;
+ if (setrlimit(RLIMIT_CORE, &nodump)) {
+ return EXIT_FAILURE;
+ }
+ /*
+ * An alternative would be to dereference a NULL pointer, but that
+ * would be an UB in C.
+ */
+#if defined(__MICROBLAZE__)
+ /*
+ * gcc emits "bri 0", which is an endless loop.
+ * Take glibc's ABORT_INSTRUCTION.
+ */
+ asm volatile("brki r0,-1");
+#else
+ __builtin_trap();
+#endif
+ }
+ err = waitpid(pid, &wstatus, 0);
+ assert(err == pid);
+ assert(WIFSIGNALED(wstatus));
+
+ return EXIT_SUCCESS;
+}
--
2.39.1