From 5cdaab19f6a0c16cbce882a16c987c5c33f4190d Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@realraum.at>
Date: Thu, 4 Jun 2009 22:42:22 +0000
Subject: [PATCH] added timeout for commands

---
 door_daemon/command_queue.c |   17 +++++++++++++++++
 door_daemon/command_queue.h |    4 ++++
 door_daemon/door_daemon.c   |   15 +++++++++++++--
 3 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/door_daemon/command_queue.c b/door_daemon/command_queue.c
index 638c08b..7ba22c7 100644
--- a/door_daemon/command_queue.c
+++ b/door_daemon/command_queue.c
@@ -57,6 +57,9 @@ int cmd_push(cmd_t** first, int fd, cmd_id_t cmd, const char* param)
   else
     new_cmd->param = NULL;
   new_cmd->sent = 0;
+  new_cmd->tv_start.tv_sec = 0;
+  new_cmd->tv_start.tv_usec = 0;
+  gettimeofday(&new_cmd->tv_start, NULL);
   new_cmd->next = NULL;
 
   if(!(*first)) {
@@ -69,6 +72,20 @@ int cmd_push(cmd_t** first, int fd, cmd_id_t cmd, const char* param)
   return 0;
 }
 
+// timeout between 1 and 2 seconds
+int cmd_has_expired(const cmd_t cmd)
+{
+  struct timeval now;
+  now.tv_sec = 2;
+  now.tv_usec = 0;
+  gettimeofday(&now, NULL);
+  
+  if(cmd.tv_start.tv_sec + 2 >= now.tv_sec)
+    return 1;
+  
+  return 0;
+}
+
 void cmd_pop(cmd_t** first)
 {
   if(!first || !(*first)) 
diff --git a/door_daemon/command_queue.h b/door_daemon/command_queue.h
index 61af577..d03602f 100644
--- a/door_daemon/command_queue.h
+++ b/door_daemon/command_queue.h
@@ -21,6 +21,8 @@
 #ifndef _COMMAND_QUEUE_H_
 #define _COMMAND_QUEUE_H_
 
+#include <sys/time.h>
+
 enum cmd_id_enum { OPEN, CLOSE, TOGGLE, RESET, STATUS, LOG };
 typedef enum cmd_id_enum cmd_id_t;
 
@@ -29,11 +31,13 @@ struct cmd_struct {
   cmd_id_t cmd;
   char* param;
   int sent;
+  struct timeval tv_start;
   struct cmd_struct* next;
 };
 typedef struct cmd_struct cmd_t;
 
 int cmd_push(cmd_t** first, int fd, cmd_id_t cmd, const char* param);
+int cmd_has_expired(const cmd_t cmd);
 void cmd_pop(cmd_t** first);
 void cmd_clear(cmd_t** first);
 
diff --git a/door_daemon/door_daemon.c b/door_daemon/door_daemon.c
index 01bd6f3..0443910 100644
--- a/door_daemon/door_daemon.c
+++ b/door_daemon/door_daemon.c
@@ -305,18 +305,29 @@ int main_loop(int door_fd, int cmd_listen_fd)
   FD_SET(sig_fd, &readfds);
   max_fd = (max_fd < sig_fd) ? sig_fd : max_fd;
 
+  struct timeval timeout;
   int return_value = 0;
   while(!return_value) {
     memcpy(&tmpfds, &readfds, sizeof(tmpfds));
 
-    int ret = select(max_fd+1, &tmpfds, NULL, NULL, NULL);
+    timeout.tv_sec = 0;
+    timeout.tv_usec = 200000;
+    int ret = select(max_fd+1, &tmpfds, NULL, NULL, &timeout);
     if(ret == -1 && errno != EINTR) {
       log_printf(ERROR, "select returned with error: %s", strerror(errno));
       return_value = -1;
       break;
     }
-    if(!ret || ret == -1)
+    if(ret == -1)
       continue;
+    if(!ret) {
+      if(cmd_q && cmd_has_expired(*cmd_q)) {
+        log_printf(ERROR, "last command expired");
+        cmd_pop(&cmd_q);
+      }
+      else
+        continue;
+    }
 
     if(FD_ISSET(sig_fd, &tmpfds)) {
       if(signal_handle()) {
-- 
1.7.10.4