[PATCH] urxvtd and mlock

[Russell Harmon]

I wrote a patch that adds a --lock option to urxvtd to call mlockall on
itself. This prevents urxvtd from ever being swapped. Patch follows:

--- src/rxvtd.C.bak    2009-01-21 09:01:22.394079003 -0500
+++ src/rxvtd.C    2009-01-21 09:21:36.534082871 -0500
@@ -32,6 +32,7 @@
 #include <sys/stat.h>
 #include <sys/socket.h>
 #include <sys/un.h>
+#include <sys/mman.h>

 #include <cerrno>

@@ -216,7 +217,7 @@
     return err ();
 }

-int opt_fork, opt_opendisplay, opt_quiet;
+int opt_fork, opt_opendisplay, opt_quiet, opt_lock;

 int
 main (int argc, const char *const *argv)
@@ -231,6 +232,8 @@
         opt_opendisplay = 1;
       else if (!strcmp (argv [i], "-q") || !strcmp (argv [i], "--quiet"))
         opt_quiet = 1;
+      else if (!strcmp (argv [i], "-l") || !strcmp (argv [i], "--lock"))
+        opt_lock = 1;
       else
         {
           rxvt_log ("%s: unknown option '%s', aborting.\n", argv [0], argv
[i]);
@@ -256,10 +259,19 @@

   free (sockname);

+  pid_t pid = 0;
   if (opt_fork)
     {
-      pid_t pid = fork ();
+      pid = fork ();
+    }
+
+  // Optionally preform a mlockall so this process does not get swapped
out.
+  if (opt_lock && pid == 0)
+    if (mlockall(MCL_CURRENT | MCL_FUTURE) == -1)
+      perror("unable to lock into ram");

+  if (opt_fork)
+    {
       if (pid < 0)
         {
           rxvt_log ("unable to fork daemon, aborting.\n");
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