udhcp: add PXELINUX config file option (code 209) definition

[oweals/busybox.git] / networking / udhcp / signalpipe.c

diff --git a/networking/udhcp/signalpipe.c b/networking/udhcp/signalpipe.c
index c181e0e06b7bc05e4573fd14d609a5d21942ca7d..6355c5e90208b5c5f7b70ba74d20bcfd1b510dd5 100644 (file)
--- a/networking/udhcp/signalpipe.c
+++ b/networking/udhcp/signalpipe.c
@@ -1,6 +1,5 @@
 /* vi: set sw=4 ts=4: */
-/* signalpipe.c
- *
+/*
  * Signal pipe infrastructure. A reliable way of delivering signals.
  *
  * Russ Dill <Russ.Dill@asu.edu> December 2003
@@ -19,10 +18,9 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
-
 #include "common.h"
 
-
+/* Global variable: we access it from signal handler */
 static struct fd_pair signal_pipe;
 
 static void signal_handler(int sig)
@@ -32,7 +30,6 @@ static void signal_handler(int sig)
                bb_perror_msg("can't send signal");
 }
 
-
 /* Call this before doing anything else. Sets up the socket pair
  * and installs the signal handler */
 void FAST_FUNC udhcp_sp_setup(void)
@@ -49,7 +46,6 @@ void FAST_FUNC udhcp_sp_setup(void)
                , signal_handler);
 }
 
-
 /* Quick little function to setup the rfds. Will return the
  * max_fd for use with select. Limited in that you can only pass
  * one extra fd */
@@ -64,7 +60,6 @@ int FAST_FUNC udhcp_sp_fd_set(fd_set *rfds, int extra_fd)
        return signal_pipe.rd > extra_fd ? signal_pipe.rd : extra_fd;
 }
 
-
 /* Read a signal from the signal pipe. Returns 0 if there is
  * no signal, -1 on error (and sets errno appropriately), and
  * your signal on success */