Re: __attribute__((warn_unused_result)) for NetBSD?

> In general EBADF is meaningless on close.
Yes, EBADF is not a big problem.

> Isn't it only possible to get EINTR on non-blocking I/O? Otherwise
> isn't this an auto-restarted call?
AFAIK SA_RESTART is BSD-ism and is absent on many systems.

> Anyways, for the most part all common usages of close don't need
> warnings about missing the return value that I can see.
I personally disagree. The following is much more robust approach.

void xclose (int fd)
{
	int ret;
	do {
		ret = close (fd);
	}while (ret == -1 && errno == EINTR);

	if (ret == -1){
		perror("perror failed");
		exit (1);
	}
}

The same for read(2), write(2) and many others.

-- 
Best regards, Aleksey Cheusov.