Re: [PATCH] selftests/net: fix unused return value warnings in ksft.h

On Sat, 06 Sep 2025 23:59:28 +0800 Nai-Chen Cheng wrote:

The write() and read() system calls in ksft_ready() and ksft_wait() functions return values that were not being checked, causing complier warnings with GCC.

Is it just a GCC warning or rather a combination of GCC and some misguided glibc decorator to force check the return of read/write? Naming the compiler versions and the warning flag which enables this would be useful. We don't see it building with normal warning level today.

Fix the warnings by casting the return values to void to indicate that ignoring them is intentional.

ret = read(fd, &byte, sizeof(byte)); (void)ret;

Can you not cast the read() to void directly?