I noticed this bug in the most recent Debian Hurd build of
https://github.com/tavianator/bfs. Here's a simple reproducer:
$ cat foo.c
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
int main() {
struct stat sb;
int ret = fstatat(STDOUT_FILENO, "", &sb, AT_EMPTY_PATH);
int err = errno;
printf("ret = %d, err = %d\n", ret, err);
return 0;
}
$ gcc foo.c -o foo
$ ./foo
ret = 0, err = 0
$ ./foo | cat
ret = -1, err = 1073741869
On the other hand, fstat(STDOUT_FILENO, &sb) works fine.
--
Tavian Barnes
