[LTP] [PATCH v1 1/3] syscalls/dup202: Also check mode whethter change when calling chmod after dup2

[Yang Xu]

Since the two file descriptors refer to the same open file description, they should
share the file status. So change mode for file after creat, then check whether oldfd
mode equals newfd mode.

Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
---
 testcases/kernel/syscalls/dup2/dup202.c | 30 +++++++++++++++++++------
 1 file changed, 23 insertions(+), 7 deletions(-)

diff --git a/testcases/kernel/syscalls/dup2/dup202.c b/testcases/kernel/syscalls/dup2/dup202.c
index 94bedcf18..c50b56ba0 100644
--- a/testcases/kernel/syscalls/dup2/dup202.c
+++ b/testcases/kernel/syscalls/dup2/dup202.c
@@ -8,10 +8,14 @@
  * [Description]
  *
  * Test whether the access mode are the same for both file descriptors.
+ * Style: creat mode, dup2, [change mode], check mode
  *
- * - 0: read only ? "0444"
- * - 1: write only ? "0222"
- * - 2: read/write ? "0666"
+ * - 0: read only, dup2, null, read only ? "0444"
+ * - 1: write only, dup2, null, write only ? "0222"
+ * - 2: read/write, dup2, null, read/write ? "0666"
+ * - 3: read/write/execute, dup2, read only, read only ? "0444"
+ * - 4: read/write/execute, dup2, write only, write only ? "0222"
+ * - 5: read/write/execute, dup2, read/write, read/write ? "0666"
  */
 
 #include <errno.h>
@@ -29,10 +33,15 @@ static int duprdo = 10, dupwro = 20, duprdwr = 30;
 static struct tcase {
 	int *nfd;
 	mode_t mode;
+	/* 0 - set mode before dup2, 1 - change mode after dup2 */
+	int flag;
 } tcases[] = {
-	{&duprdo, 0444},
-	{&dupwro, 0222},
-	{&duprdwr, 0666},
+	{&duprdo, 0444, 0},
+	{&dupwro, 0222, 0},
+	{&duprdwr, 0666, 0},
+	{&duprdo, 0444, 1},
+	{&dupwro, 0222, 1},
+	{&duprdwr, 0666, 1},
 };
 
 static void setup(void)
@@ -52,7 +61,10 @@ static void run(unsigned int i)
 	struct stat oldbuf, newbuf;
 	struct tcase *tc = tcases + i;
 
-	ofd = SAFE_CREAT(testfile, tc->mode);
+	if (tc->flag)
+		ofd = SAFE_CREAT(testfile, 0777);
+	else
+		ofd = SAFE_CREAT(testfile, tc->mode);
 	nfd = *tc->nfd;
 
 	TEST(dup2(ofd, nfd));
@@ -60,6 +72,10 @@ static void run(unsigned int i)
 		tst_res(TFAIL | TTERRNO, "call failed unexpectedly");
 		goto free;
 	}
+	if (tc->flag) {
+		SAFE_CHMOD(testfile, tc->mode);
+		tst_res(TINFO, "original mode 0777, new mode 0%o after chmod", tc->mode);
+	}
 
 	SAFE_FSTAT(ofd, &oldbuf);
 
-- 
2.23.0