[LTP] [PATCH] gethostname02: Accept EOVERFLOW on alpha

[panzhe]

On alpha glibc's gethostname() directly calls the kernel
syscall and sets errno to EOVERFLOW when the buffer is
too small, because the kernel truncates silently and the
string is not null terminated.

On the other hand, the generic posix implementation used
on x86_64 sets ENAMETOOLONG in this case.

Fix this by accepting both errnos.

Closes: https://github.com/linux-test-project/ltp/issues/1319
Signed-off-by: panzhe <panzhe@kylinos.cn>
---
 testcases/kernel/syscalls/gethostname/gethostname02.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/testcases/kernel/syscalls/gethostname/gethostname02.c b/testcases/kernel/syscalls/gethostname/gethostname02.c
index c56fcb800..28d78762d 100644
--- a/testcases/kernel/syscalls/gethostname/gethostname02.c
+++ b/testcases/kernel/syscalls/gethostname/gethostname02.c
@@ -7,7 +7,7 @@
 /*\
  * Verify that gethostname(2) fails with
  *
- * - ENAMETOOLONG when len is smaller than the actual size
+ * - ENAMETOOLONG or EOVERFLOW when len is smaller than the actual size
  */
 
 #include "tst_test.h"
@@ -16,11 +16,13 @@ static void verify_gethostname(void)
 {
 	char hostname[HOST_NAME_MAX + 1];
 	int real_length;
+	const int exp_errnos[] = {ENAMETOOLONG, EOVERFLOW};
 
 	SAFE_GETHOSTNAME(hostname, sizeof(hostname));
 	real_length = strlen(hostname);
 
-	TST_EXP_FAIL(gethostname(hostname, real_length - 1), ENAMETOOLONG,
+	TST_EXP_FAIL2_ARR(gethostname(hostname, real_length - 1),
+		exp_errnos, ARRAY_SIZE(exp_errnos),
 		"len is smaller than the actual size");
 }
 
-- 
2.25.1