X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;ds=sidebyside;f=src%2Fstdio%2Ffileno.c;h=0bd0e9889eb02b013eb31feea112dd1031bdbc15;hb=7590203c486d9002522019045d34ee3dee0a66f5;hp=9ffb26d54d17754bc6b5bac465281a87a338564f;hpb=0b44a0315b47dd8eced9f3b7f31580cf14bbfc01;p=musl

diff --git a/src/stdio/fileno.c b/src/stdio/fileno.c
index 9ffb26d5..0bd0e988 100644
--- a/src/stdio/fileno.c
+++ b/src/stdio/fileno.c
@@ -1,8 +1,16 @@
 #include "stdio_impl.h"
+#include <errno.h>
 
 int fileno(FILE *f)
 {
-	return f->fd;
+	FLOCK(f);
+	int fd = f->fd;
+	FUNLOCK(f);
+	if (fd < 0) {
+		errno = EBADF;
+		return -1;
+	}
+	return fd;
 }
 
 weak_alias(fileno, fileno_unlocked);