Adds ability to execute sh scripts in xwrits before lock and after unlock.

xwrits-lock-hooks.diff

diff -u xwrits-2.26//main.c xwrits/main.c
--- xwrits-2.26//main.c	2009-04-04 01:17:02.000000000 +0400
+++ xwrits/main.c	2010-09-01 14:06:52.531052264 +0400
@@ -10,6 +10,7 @@
 #ifdef HAVE_XINERAMA
 #include <X11/extensions/Xinerama.h>
 #endif
+#include <signal.h>
 
 static Options onormal;
 Options *ocurrent;
@@ -63,6 +64,9 @@
 static int force_mono = 0;
 static int multiscreen = 0;
 
+static const char *before_lock_command = 0;
+static const char *after_lock_command = 0;
+
 
 static void
 short_usage(void)
@@ -757,6 +761,10 @@
       ;
     else if (optparse(s, "wp", 2, "ss", &o->slideshow_text))
       ;
+    else if (optparse(s, "before-lock", 1, "ss", &before_lock_command))
+      ;
+    else if (optparse(s, "after-lock", 1, "ss", &after_lock_command))
+      ;
 
     else
       short_usage();
@@ -1089,6 +1097,30 @@
 }
 
 
+void fork_and_run(const char* const cmd)
+{
+	pid_t pid;
+	pid = fork();
+	if (pid == 0) {
+		execl("/bin/sh", "/bin/sh", "-c", cmd, NULL);
+		_exit(0);
+	}
+}
+
+void on_before_lock()
+{
+	if (before_lock_command) {
+		fork_and_run(before_lock_command);
+	}
+}
+void on_after_lock()
+{
+	if (after_lock_command) {
+		fork_and_run(after_lock_command);
+	}
+}
+
+
 /* main! */
 
 typedef enum {
@@ -1159,7 +1191,9 @@
 
 	  case ST_LOCK:
 	    was_lock = 1;
+		on_before_lock();
 	    tran = lock();
+		on_after_lock();
 	    assert(tran == TRAN_AWAKE || tran == TRAN_FAIL);
 	    if (tran == TRAN_AWAKE)
 		s = ST_AWAKE;
@@ -1198,6 +1232,8 @@
   default_settings();
   parse_options(argc - 1, argv + 1);
 
+  signal(SIGCLD, SIG_IGN);
+
   /* At this point, all ports have 'display_name' valid and everything else
      invalid. Open displays, check multiscreen */
   orig_nports = nports;
diff -u xwrits-2.26//xwrits.1 xwrits/xwrits.1
--- xwrits-2.26//xwrits.1	2009-04-04 01:17:59.000000000 +0400
+++ xwrits/xwrits.1	2010-08-13 14:16:02.831761508 +0400
@@ -307,6 +307,16 @@
 Sets the image that appears on the warning window to an arbitrary GIF.
 Animations are acceptable.
 '
+.TP 5
+\fBbefore-lock\fP=\fIfile.sh\fP
+Executes this sh script before locking the screen. User running xwrits should
+have execution flag on this file.
+'
+.TP 5
+\fBafter-lock\fP=\fIfile.sh\fP
+Executes this sh script after unlocking the screen. User running xwrits should
+have execution flag on this file.
+'
 .SH EXAMPLES
 Here is the way I run xwrits:
 .nf