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From: John Scott <jscott@posteo.net>
To: musl@lists.openwall.com
Date: Thu, 08 Oct 2020 10:55:47 -0400
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Subject: [musl] fputs/fputc doesn't set errno on failure

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Hi,

I'm not subscribed, please keep me CC'd.

In this corner case, errno is unset despite fputs giving an error. I'm on Debian testing using musl-gcc 1.2.1.

#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <errno.h>
#include <stdio.h>
int main(void) {
	FILE *f = fopen("/", "r");
	if(f == NULL) {
		perror("fopen()");
	}
	if(fputs("Hello world\n", f) == EOF) {
		assert(errno);
		perror("fputs()");
	}
}

With glibc this prints EBADF for fputs.

The wiki page about writing tests [1], which I thought this would be a good candidate for, has the 404 link http://nsz.repo.hu/git/?p=libc-test

Please let me know if I can help debugging.

[1] https://wiki.musl-libc.org/writing-tests.html
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