#include "stdio_impl.h"
+#include <errno.h>
int fileno(FILE *f)
{
- /* f->fd never changes, but the lock must be obtained and released
- * anyway since this function cannot return while another thread
- * holds the lock. */
FLOCK(f);
+ int fd = f->fd;
FUNLOCK(f);
- return f->fd;
+ if (fd < 0) {
+ errno = EBADF;
+ return -1;
+ }
+ return fd;
}
weak_alias(fileno, fileno_unlocked);