give sysctl /dev/null instead of no stdin/stdout

1 files changed, 28 insertions, 0 deletions

diff --git a/src/exit/gnunet-helper-exit.c b/src/exit/gnunet-helper-exit.c
index 30f5d2569..882778b3f 100644
--- a/src/exit/gnunet-helper-exit.c
+++ b/src/exit/gnunet-helper-exit.c
@@ -89,6 +89,32 @@ struct in6_ifreq
 #endif
 
 
+/**
+ * Open '/dev/null' and make the result the given
+ * file descriptor.
+ *
+ * @param target_fd desired FD to point to /dev/null
+ * @param flags open flags (O_RDONLY, O_WRONLY)
+ */
+static void
+open_dev_null (int target_fd,
+               int flags)
+{
+  int fd;
+
+  fd = open ("/dev/null", flags);
+  if (-1 == fd)
+    abort ();
+  if (fd == target_fd)
+    return;
+  if (-1 == dup2 (fd, target_fd))
+  {    
+    (void) close (fd);
+    abort ();
+  }
+  (void) close (fd);
+}
+
 
 /**
  * Run the given command and wait for it to complete.
@@ -119,7 +145,9 @@ fork_and_exec (const char *file,
     /* close stdin/stdout to not cause interference
        with the helper's main protocol! */
     (void) close (0); 
+    open_dev_null (0, O_RDONLY);
     (void) close (1); 
+    open_dev_null (1, O_WRONLY);
     (void) execv (file, cmd);
     /* can only get here on error */
     fprintf (stderr,