From be89f3883d90483fc17e7ab55c89f40cba3ee82a Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@operamail.com>
Date: Mon, 19 May 2014 21:03:00 +0200
Subject: set up signal handling
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Signed-off-by: Mattias Andrée <maandree@operamail.com>
---
 src/mds-base.c | 29 ++++++++++++++++++++++++++++-
 src/mds-base.h | 31 ++++++++++++++++++++++++++++++-
 2 files changed, 58 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/mds-base.c b/src/mds-base.c
index ede29c3..ec92571 100644
--- a/src/mds-base.c
+++ b/src/mds-base.c
@@ -19,6 +19,7 @@
 
 #include <libmdsserver/config.h>
 #include <libmdsserver/macros.h>
+#include <libmdsserver/util.h>
 
 #include <stdlib.h>
 #include <string.h>
@@ -28,6 +29,7 @@
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <unistd.h>
+#include <signal.h>
 
 
 #define  try(INSTRUCTION)  if ((r = INSTRUCTION))  return r
@@ -137,10 +139,13 @@ int main(int argc_, char** argv_)
   exit_if (argc > ARGC_LIMIT + LIBEXEC_ARGC_EXTRA_LIMIT,
 	   eprint("that number of arguments is ridiculous, I will not allow it."););
   
-  
   /* Parse command line arguments. */
   try (parse_cmdline());
   
+  
+  /* Set up signal traps for all especially handled signals.  */
+  trap_signals();
+  
   /* Connect to the display. */
   if (is_reexec == 0)
     try (connect_to_display());
@@ -157,5 +162,27 @@ int main(int argc_, char** argv_)
 }
 
 
+/**
+ * Set up signal traps for all especially handled signals
+ * 
+ * @return  Non-zero on error
+ */
+int trap_signals(void)
+{
+  /* Make the server update without all slaves dying on SIGUSR1. */
+  fail_if (xsigaction(SIGUSR1, received_reexec) < 0);
+  
+  /* Implement clean exit on SIGTERM. */
+  fail_if (xsigaction(SIGTERM, received_terminate) < 0);
+  
+  /* Implement clean exit on SIGINT. */
+  fail_if (xsigaction(SIGINT, received_terminate) < 0);
+  
+  return 0;
+ pfail:
+  return 1;
+}
+
+
 #undef try
 
diff --git a/src/mds-base.h b/src/mds-base.h
index 26b9c17..e206a78 100644
--- a/src/mds-base.h
+++ b/src/mds-base.h
@@ -36,7 +36,7 @@ typedef struct server_characteristics
  * This variable should declared by the actual server implementation.
  * It must be configured before `main` is invoked.
  * 
- * This tells the server-base how to behave.
+ * This tells the server-base how to behave
  */
 extern server_characteristics_t server_characteristics;
 
@@ -73,5 +73,34 @@ extern int socket_fd;
 
 
 
+/**
+ * Set up signal traps for all especially handled signals
+ * 
+ * @return  Non-zero on error
+ */
+int trap_signals(void);
+
+
+/**
+ * This function should be implemented by the actual server implementation
+ * 
+ * This function is called when a signal that
+ * signals the server to re-exec has been received
+ * 
+ * @param  signo  The signal that has been received
+ */
+extern void received_reexec(int signo);
+
+/**
+ * This function should be implemented by the actual server implementation
+ * 
+ * This function is called when a signal that
+ * signals the server to re-exec has been received
+ * 
+ * @param  signo  The signal that has been received
+ */
+extern void received_terminate(int signo);
+
+
 #endif
 
-- 
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