[glib/backport-2325-symlink-replace-file-glib-2-66: 5/5] glocalfileoutputstream: Add a missing O_CLOEXEC flag to replace()

[Philip Withnall <pwithnall src gnome org>]

commit 6c6439261bc7a8a0627519848a7222b3e1bd4ffe
Author: Philip Withnall <pwithnall endlessos org>
Date:   Wed Feb 24 17:42:24 2021 +0000

    glocalfileoutputstream: Add a missing O_CLOEXEC flag to replace()
    
    Signed-off-by: Philip Withnall <pwithnall endlessos org>

 gio/glocalfileoutputstream.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)
---
diff --git a/gio/glocalfileoutputstream.c b/gio/glocalfileoutputstream.c
index a2c7e3cc0..4c512ea81 100644
--- a/gio/glocalfileoutputstream.c
+++ b/gio/glocalfileoutputstream.c
@@ -63,6 +63,12 @@
 #define O_BINARY 0
 #endif
 
+#ifndef O_CLOEXEC
+#define O_CLOEXEC 0
+#else
+#define HAVE_O_CLOEXEC 1
+#endif
+
 struct _GLocalFileOutputStreamPrivate {
   char *tmp_filename;
   char *original_filename;
@@ -1239,7 +1245,7 @@ _g_local_file_output_stream_replace (const char        *filename,
   sync_on_close = FALSE;
 
   /* If the file doesn't exist, create it */
-  open_flags = O_CREAT | O_EXCL | O_BINARY;
+  open_flags = O_CREAT | O_EXCL | O_BINARY | O_CLOEXEC;
   if (readable)
     open_flags |= O_RDWR;
   else
@@ -1269,8 +1275,11 @@ _g_local_file_output_stream_replace (const char        *filename,
       set_error_from_open_errno (filename, error);
       return NULL;
     }
-  
- 
+#if !defined(HAVE_O_CLOEXEC) && defined(F_SETFD)
+  else
+    fcntl (fd, F_SETFD, FD_CLOEXEC);
+#endif
+
   stream = g_object_new (G_TYPE_LOCAL_FILE_OUTPUT_STREAM, NULL);
   stream->priv->fd = fd;
   stream->priv->sync_on_close = sync_on_close;