[glib] Make cancellable pipe fds close-on-exec

[Alexander Larsson <alexl src gnome org>]

commit a48fc532519b849498c8b75dde578caf0c270b23
Author: Alexander Larsson <alexl redhat com>
Date:   Fri May 15 10:42:28 2009 +0200

    Make cancellable pipe fds close-on-exec
    
    GCancellable is purely an in-process thing, so ensure that no cancellable
    fds accidentally leak to child processes.
---
 gio/gcancellable.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/gio/gcancellable.c b/gio/gcancellable.c
index 39f8778..589b83a 100644
--- a/gio/gcancellable.c
+++ b/gio/gcancellable.c
@@ -189,6 +189,20 @@ set_fd_nonblocking (int fd)
 }
 
 static void
+set_fd_close_exec (int fd)
+{
+  int flags;
+
+  flags = fcntl (fd, F_GETFD, 0);
+  if (flags != -1 && (flags & FD_CLOEXEC) == 0)
+    {
+      flags |= FD_CLOEXEC;
+      fcntl (fd, F_SETFD, flags);
+    }
+}
+
+
+static void
 g_cancellable_open_pipe (GCancellable *cancellable)
 {
   if (pipe (cancellable->cancel_pipe) == 0)
@@ -198,6 +212,8 @@ g_cancellable_open_pipe (GCancellable *cancellable)
        */
       set_fd_nonblocking (cancellable->cancel_pipe[0]);
       set_fd_nonblocking (cancellable->cancel_pipe[1]);
+      set_fd_close_exec (cancellable->cancel_pipe[0]);
+      set_fd_close_exec (cancellable->cancel_pipe[1]);
     }
   else
     g_warning ("Failed to create pipe for GCancellable. Out of file descriptors?");