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selftests: filesystems: fix warn_unused_result build warnings

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Add return value checks for read & write calls in test_listmount_ns
function. This patch resolves below compilation warnings:

```
statmount_test_ns.c: In function ‘test_listmount_ns’:

statmount_test_ns.c:322:17: warning: ignoring return value of ‘write’
declared with attribute ‘warn_unused_result’ [-Wunused-result]

statmount_test_ns.c:323:17: warning: ignoring return value of ‘read’
declared with attribute ‘warn_unused_result’ [-Wunused-result]
```

Signed-off-by: Abhinav Jain <jain.abhinav177@gmail.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Abhinav Jain 2024-08-10 19:23:33 +05:30 committed by Shuah Khan
parent 611fbeb44a
commit b4bcdff7e8
1 changed files with 5 additions and 2 deletions
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7
tools/testing/selftests/filesystems/statmount/statmount_test_ns.c
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@ -319,8 +319,11 @@ static void test_listmount_ns(void)
* Tell our parent how many mounts we have, and then wait for it
* to tell us we're done.
*/
write(child_ready_pipe[1], &nr_mounts, sizeof(nr_mounts));
read(parent_ready_pipe[0], &cval, sizeof(cval));
if (write(child_ready_pipe[1], &nr_mounts, sizeof(nr_mounts)) !=
sizeof(nr_mounts))
ret = NSID_ERROR;
if (read(parent_ready_pipe[0], &cval, sizeof(cval)) != sizeof(cval))
ret = NSID_ERROR;
exit(NSID_PASS);
}