stdio buffers data in user land. By calling fflush(3), this

data is sent to the kernel using write(2). fsync'ing a
file descriptor is not required -- writing to a fd has the same
affect as calling fflush after each fwrite.

1 files changed, 7 insertions, 3 deletions

diff --git a/main/streams.c b/main/streams.c
index 4eb73e1ae9..475a4bbc2f 100755
--- a/main/streams.c
+++ b/main/streams.c
@@ -1280,11 +1280,15 @@ static int php_stdiop_flush(php_stream *stream TSRMLS_DC)
 
 	assert(data != NULL);
 
-	if (data->fd >= 0) {
-		return fsync(data->fd);
-	} else {
+	/*
+	 * stdio buffers data in user land. By calling fflush(3), this
+	 * data is send to the kernel using write(2). fsync'ing is
+	 * something completely different.
+	 */
+	if (data->fd < 0) {
 		return fflush(data->file);
 	}
+	return 0;
 }
 
 static int php_stdiop_seek(php_stream *stream, off_t offset, int whence, off_t *newoffset TSRMLS_DC)