[LTP] [PATCH] msgrcv02: Add negative msgtyp tests

[Richard Palethorpe]

Test that we do not get higher message types. Also that -1 msgtyp is not
misinterpreted as INT_MAX by using MSG_EXCEPT.

Signed-off-by: Richard Palethorpe <rpalethorpe@suse.com>
Suggested-by: Cyril Hrubis <chrubis@suse.cz>
---
 .../kernel/syscalls/ipc/msgrcv/msgrcv02.c     | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/testcases/kernel/syscalls/ipc/msgrcv/msgrcv02.c b/testcases/kernel/syscalls/ipc/msgrcv/msgrcv02.c
index cfb7d7446..fba6a5289 100644
--- a/testcases/kernel/syscalls/ipc/msgrcv/msgrcv02.c
+++ b/testcases/kernel/syscalls/ipc/msgrcv/msgrcv02.c
@@ -21,6 +21,8 @@
  *   msgflg and no message of the requested type existed on the message queue.
  */
 
+#define _GNU_SOURCE
+
 #include <string.h>
 #include <sys/wait.h>
 #include <sys/msg.h>
@@ -38,7 +40,7 @@ struct passwd *pw;
 static struct buf {
 	long type;
 	char mtext[MSGSIZE];
-} rcv_buf, snd_buf = {MSGTYPE, "hello"};
+} rcv_buf, snd_buf = {2, "hello"};
 
 static struct tcase {
 	int *id;
@@ -49,12 +51,15 @@ static struct tcase {
 	int exp_user;
 	int exp_err;
 } tcases[] = {
-	{&queue_id, &rcv_buf, 4, 1, 0, 0, E2BIG},
-	{&queue_id, &rcv_buf, MSGSIZE, 1, 0, 1, EACCES},
-	{&queue_id, NULL, MSGSIZE, 1, 0, 0, EFAULT},
-	{&bad_id, &rcv_buf, MSGSIZE, 1, 0, 0, EINVAL},
-	{&queue_id, &rcv_buf, -1, 1, 0, 0, EINVAL},
-	{&queue_id, &rcv_buf, MSGSIZE, 2, IPC_NOWAIT, 0, ENOMSG},
+	{&queue_id, &rcv_buf, MSGSIZE - 1, 2, 0, 0, E2BIG},
+	{&queue_id, &rcv_buf, MSGSIZE,     2, 0, 1, EACCES},
+	{&queue_id, NULL,     MSGSIZE,     2, 0, 0, EFAULT},
+	{&bad_id,   &rcv_buf, MSGSIZE,     2, 0, 0, EINVAL},
+	{&queue_id, &rcv_buf, -1,          2, 0, 0, EINVAL},
+
+	{&queue_id, &rcv_buf, MSGSIZE,  3, IPC_NOWAIT,              0, ENOMSG},
+	{&queue_id, &rcv_buf, MSGSIZE, -1, IPC_NOWAIT,              0, ENOMSG},
+	{&queue_id, &rcv_buf, MSGSIZE, -1, IPC_NOWAIT | MSG_EXCEPT, 0, ENOMSG},
 };
 
 static void verify_msgrcv(struct tcase *tc)
-- 
2.33.0