lib: add and use set_cloexec()

watchquagga is already leaking an open file descriptor on its pid file
on fork+exec() invocations; next up is adding vtysh support with even
more fds.  Mark things CLOEXEC before going there.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/lib/network.c b/lib/network.c
index 5379ecb5a6..506e019136 100644
--- a/lib/network.c
+++ b/lib/network.c
@@ -94,6 +94,20 @@ set_nonblocking(int fd)
   return 0;
 }
 
+int
+set_cloexec(int fd)
+{
+  int flags;
+  flags = fcntl(fd, F_GETFD, 0);
+  if (flags == -1)
+    return -1;
+
+  flags |= FD_CLOEXEC;
+  if (fcntl(fd, F_SETFD, flags) == -1)
+    return -1;
+  return 0;
+}
+
 float
 htonf (float host)
 {