X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fstdio%2Ffileno.c;h=0bd0e9889eb02b013eb31feea112dd1031bdbc15;hb=9b132e556774c744f9052581d2d8d0fab417e97c;hp=ba7f9391b1ec9baa6023f9a66f569b46a1f85ba2;hpb=c8cb6bcdf009e94c12c6e256b8e24a9bc5fdaf05;p=musl

diff --git a/src/stdio/fileno.c b/src/stdio/fileno.c
index ba7f9391..0bd0e988 100644
--- a/src/stdio/fileno.c
+++ b/src/stdio/fileno.c
@@ -1,13 +1,16 @@
 #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);