[LTP] [PATCH v4] Introduce ioctl_pidfd_get_info_supported() function

[Avinesh Kumar]

Check if ioctl(PIDFD_GET_INFO) is implemented or not
before proceeding in ioctl_pidfd05 test

Suggested-by: Cyril Hrubis <chrubis@suse.cz>
Suggested-by: Petr Vorel <pvorel@suse.cz>
Signed-off-by: Avinesh Kumar <akumar@suse.de>
---
 testcases/kernel/syscalls/ioctl/ioctl_pidfd.h | 28 +++++++++++++++++++
 .../kernel/syscalls/ioctl/ioctl_pidfd05.c     |  9 +++++-
 2 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/testcases/kernel/syscalls/ioctl/ioctl_pidfd.h b/testcases/kernel/syscalls/ioctl/ioctl_pidfd.h
index 811f969cd..b785d8043 100644
--- a/testcases/kernel/syscalls/ioctl/ioctl_pidfd.h
+++ b/testcases/kernel/syscalls/ioctl/ioctl_pidfd.h
@@ -9,6 +9,34 @@
 #include "tst_test.h"
 #include "lapi/pidfd.h"
 
+static inline bool ioctl_pidfd_get_info_supported(void)
+{
+	pid_t pid;
+	int pidfd, ret;
+	int supported = 0;
+	struct pidfd_info info;
+
+	if (tst_kvercmp(6, 13, 0) >= 0)
+		return 1;
+
+	memset(&info, 0, sizeof(struct pidfd_info));
+
+	pid = SAFE_FORK();
+	if (!pid)
+		exit(100);
+
+	pidfd = SAFE_PIDFD_OPEN(pid, 0);
+
+	ret = ioctl(pidfd, PIDFD_GET_INFO, &info);
+	SAFE_WAITPID(pid, NULL, 0);
+
+	if (ret != -1)
+		supported = 1;
+
+	SAFE_CLOSE(pidfd);
+	return supported;
+}
+
 static inline int ioctl_pidfd_info_exit_supported(void)
 {
 	int ret;
diff --git a/testcases/kernel/syscalls/ioctl/ioctl_pidfd05.c b/testcases/kernel/syscalls/ioctl/ioctl_pidfd05.c
index c379717b3..d20c6f074 100644
--- a/testcases/kernel/syscalls/ioctl/ioctl_pidfd05.c
+++ b/testcases/kernel/syscalls/ioctl/ioctl_pidfd05.c
@@ -14,7 +14,7 @@
 #include "tst_test.h"
 #include "lapi/pidfd.h"
 #include "lapi/sched.h"
-#include "lapi/ioctl.h"
+#include "ioctl_pidfd.h"
 
 struct pidfd_info_invalid {
 	uint32_t dummy;
@@ -48,8 +48,15 @@ static void run(void)
 	SAFE_CLOSE(pidfd);
 }
 
+static void setup(void)
+{
+	if (!ioctl_pidfd_get_info_supported())
+		tst_brk(TCONF, "ioctl(PIDFD_GET_INFO) is not implemented");
+}
+
 static struct tst_test test = {
 	.test_all = run,
+	.setup = setup,
 	.forks_child = 1,
 	.bufs = (struct tst_buffers []) {
 		{&args, .size = sizeof(*args)},
-- 
2.51.0