X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Fstdio%2Ffileno.c;h=ba7f9391b1ec9baa6023f9a66f569b46a1f85ba2;hp=9ffb26d54d17754bc6b5bac465281a87a338564f;hb=HEAD;hpb=0b44a0315b47dd8eced9f3b7f31580cf14bbfc01

diff --git a/src/stdio/fileno.c b/src/stdio/fileno.c
index 9ffb26d5..ba7f9391 100644
--- a/src/stdio/fileno.c
+++ b/src/stdio/fileno.c
@@ -2,6 +2,11 @@
 
 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);
+	FUNLOCK(f);
 	return f->fd;
 }