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
  56     dpy = XOpenDisplay(NULL);
  57     if (dpy) {
  58 /* XXX TODO make sure that window states are saved and restored via netwm */
  59
  60         XGrabServer(dpy);
  61         crashAction = wShowCrashingDialogPanel(sig);
  62         XCloseDisplay(dpy);
  63         dpy = NULL;
  64     } else {
  65         wsyserror(_("cannot open connection for crashing dialog panel. Aborting."));
  66         crashAction = WMAbort;
  67     }
  68
  69     if (crashAction == WMStartAlternate)
  70     {
  71         int i;
  72
  73         wmessage(_("trying to start alternate window manager..."));
  74
  75         for (i=0; i<WMGetArrayItemCount(wPreferences.fallbackWMs); i++) {
  76             Restart(WMGetFromArray(wPreferences.fallbackWMs, i), False);
  77         }
  78
  79         wfatal(_("failed to start alternate window manager. Aborting."));
  80
  81         return 0;
  82     }
  83     else if (crashAction == WMAbort)
  84       return 0;
  85     else
  86       return 1;
  87 }
  88
  89
  90 int MonitorLoop(int argc, char **argv)
  91 {
  92     pid_t pid, exited;
  93     char **child_argv= wmalloc(sizeof(char*)*(argc+2));
  94     int i, status;
  95     time_t last_start;
  96     Bool error = False;
  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         do {
 122             if ((exited=waitpid(-1, &status, 0)) < 0)
 123             {
 124                 wsyserror(_("Error during monitoring of Window Maker process."));
 125                 error = True;
 126                 break;
 127             }
 128         } while (exited != pid);
 129
 130         if (error)
 131             break;
 132
 133         child_argv[argc]= "--for-real-";
 134
 135         /* Check if the wmaker process exited due to a crash */
 136         if (WIFSIGNALED(status) &&
 137             (WTERMSIG(status) == SIGSEGV ||
 138              WTERMSIG(status) == SIGBUS ||
 139              WTERMSIG(status) == SIGILL ||
 140              WTERMSIG(status) == SIGABRT ||
 141              WTERMSIG(status) == SIGFPE))
 142         {
 143             /* If so, we check when was the last restart.
 144              * If it was less than 3s ago, it's a bad sign, so we show
 145              * the crash panel and ask the user what to do */
 146             if (time(NULL) - last_start < 3)
 147             {
 148                 if (showCrashDialog(WTERMSIG(status)) == 0) {
 149                     return 1;
 150                 }
 151             }
 152             wwarning(_("Window Maker exited due to a crash (signal %i) and will be restarted."),
 153                      WTERMSIG(status));
 154         }
 155         else
 156           break;
 157     }
 158     return 0;
 159 }
 160