Add a small test to prevent regressions.
Signed-off-by: Ilya Leoshkevich <i...@linux.ibm.com>
---
tests/tcg/multiarch/linux/linux-shmat-null.c | 38 ++++++++++++++++++++
1 file changed, 38 insertions(+)
create mode 100644 tests/tcg/multiarch/linux/linux-shmat-null.c
diff --git a/tests/tcg/multiarch/linux/linux-shmat-null.c
b/tests/tcg/multiarch/linux/linux-shmat-null.c
new file mode 100644
index 00000000000..94eaaec371a
--- /dev/null
+++ b/tests/tcg/multiarch/linux/linux-shmat-null.c
@@ -0,0 +1,38 @@
+/*
+ * Test shmat(NULL).
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include <assert.h>
+#include <stdlib.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+
+int main(void)
+{
+ int shmid;
+ char *p;
+ int err;
+
+ /* Create, attach and intialize shared memory. */
+ shmid = shmget(IPC_PRIVATE, 1, IPC_CREAT | 0600);
+ assert(shmid != -1);
+ p = shmat(shmid, NULL, 0);
+ assert(p != (void *)-1);
+ *p = 42;
+
+ /* Reattach, check that the value is still there. */
+ err = shmdt(p);
+ assert(err == 0);
+ p = shmat(shmid, NULL, 0);
+ assert(p != (void *)-1);
+ assert(*p == 42);
+
+ /* Detach. */
+ err = shmdt(p);
+ assert(err == 0);
+ err = shmctl(shmid, IPC_RMID, NULL);
+ assert(err == 0);
+
+ return EXIT_SUCCESS;
+}
--
2.44.0
