src/monitor.c

   1 /* monitor.c - monitors the wmaker process
   2  *
   3  *  Window Maker window manager
   4  *
   5  *  Copyright (c) 1997-2004 Alfredo K. Kojima
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  20  *  USA.
  21  */
  22
  23 #include "wconfig.h"
  24 #include <unistd.h>
  25 #include <stdlib.h>
  26 #include <time.h>
  27 #include <signal.h>
  28 #include <sys/wait.h>
  29 #ifdef __FreeBSD__
  30 #include <sys/signal.h>
  31 #endif
  32
  33 #include <X11/Xlib.h>
  34 #include <X11/Xutil.h>
  35 #include <X11/Xproto.h>
  36
  37 #include "WindowMaker.h"
  38 #include "screen.h"
  39 #include "window.h"
  40 #include "dialog.h"
  41 #include "funcs.h"
  42
  43 /****** Global Variables ******/
  44
  45 extern WPreferences wPreferences;
  46
  47 extern int wScreenCount;
  48
  49
  50
  51
  52 int showCrashDialog(int sig)
  53 {
  54     int crashAction;
  55     Display *dpy;
  56
  57     dpy = XOpenDisplay("");
  58     if (dpy) {
  59 /* XXX TODO make sure that window states are saved and restored via netwm */
  60
  61         XGrabServer(dpy);
  62         crashAction = wShowCrashingDialogPanel(sig);
  63         XCloseDisplay(dpy);
  64         dpy = NULL;
  65     } else {
  66         wsyserror(_("cannot open connection for crashing dialog panel. Aborting."));
  67         crashAction = WMAbort;
  68     }
  69
  70     if (crashAction == WMRestart)
  71     {
  72         int i;
  73
  74         wmessage(_("trying to start alternate window manager..."));
  75
  76         for (i=0; i<WMGetArrayItemCount(wPreferences.fallbackWMs); i++) {
  77             Restart(WMGetFromArray(wPreferences.fallbackWMs, i), False);
  78         }
  79
  80         wfatal(_("failed to start alternate window manager. Aborting."));
  81
  82         return 0;
  83     }
  84     else if (crashAction == WMAbort)
  85       return 0;
  86     else
  87       return 1;
  88 }
  89
  90
  91 int MonitorLoop(int argc, char **argv)
  92 {
  93     pid_t pid, exited;
  94     char **child_argv= wmalloc(sizeof(char*)*(argc+2));
  95     int i, status;
  96     time_t last_start;
  97
  98     for (i= 0; i < argc; i++)
  99         child_argv[i]= argv[i];
 100     child_argv[i++]= "--for-real";
 101     child_argv[i]= NULL;
 102
 103     for (;;)
 104     {
 105         last_start= time(NULL);
 106
 107         /* Start Window Maker */
 108         pid = fork();
 109         if (pid == 0)
 110         {
 111             execvp(child_argv[0], child_argv);
 112             wsyserror(_("Error respawning Window Maker"));
 113             exit(1);
 114         }
 115         else if (pid < 0)
 116         {
 117             wsyserror(_("Error respawning Window Maker"));
 118             exit(1);
 119         }
 120
 121         if ((exited=waitpid(-1, &status, 0)) < 0)
 122         {
 123             wsyserror(_("Error during monitoring of Window Maker process."));
 124             break;
 125         }
 126
 127         if (exited != pid)
 128             continue;
 129
 130         child_argv[argc]= "--for-real-";
 131
 132         /* Check if the wmaker process exited due to a crash */
 133         if (WIFSIGNALED(status) &&
 134             (WTERMSIG(status) == SIGSEGV ||
 135              WTERMSIG(status) == SIGBUS ||
 136              WTERMSIG(status) == SIGILL ||
 137              WTERMSIG(status) == SIGABRT ||
 138              WTERMSIG(status) == SIGFPE))
 139         {
 140             /* If so, we check when was the last restart.
 141              * If it was less than 3s ago, it's a bad sign, so we show
 142              * the crash panel and ask the user what to do */
 143             if (time(NULL) - last_start < 3)
 144             {
 145                 if (showCrashDialog(WTERMSIG(status)) == 0)
 146                   return 1;
 147             }
 148             wwarning(_("Window Maker exited due to a crash (signal %i) and will be restarted."),
 149                      WTERMSIG(status));
 150         }
 151         else
 152           break;
 153     }
 154     return 0;
 155 }
 156