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 int showCrashDialog(int sig)
  50 {
  51         int crashAction;
  52
  53         dpy = XOpenDisplay(NULL);
  54         if (dpy) {
  55 /* XXX TODO make sure that window states are saved and restored via netwm */
  56
  57                 XGrabServer(dpy);
  58                 crashAction = wShowCrashingDialogPanel(sig);
  59                 XCloseDisplay(dpy);
  60                 dpy = NULL;
  61         } else {
  62                 wsyserror(_("cannot open connection for crashing dialog panel. Aborting."));
  63                 crashAction = WMAbort;
  64         }
  65
  66         if (crashAction == WMStartAlternate) {
  67                 int i;
  68
  69                 wmessage(_("trying to start alternate window manager..."));
  70
  71                 for (i = 0; i < WMGetArrayItemCount(wPreferences.fallbackWMs); i++) {
  72                         Restart(WMGetFromArray(wPreferences.fallbackWMs, i), False);
  73                 }
  74
  75                 wfatal(_("failed to start alternate window manager. Aborting."));
  76
  77                 return 0;
  78         } else if (crashAction == WMAbort)
  79                 return 0;
  80         else
  81                 return 1;
  82 }
  83
  84 int MonitorLoop(int argc, char **argv)
  85 {
  86         pid_t pid, exited;
  87         char **child_argv = wmalloc(sizeof(char *) * (argc + 2));
  88         int i, status;
  89         time_t last_start;
  90         Bool error = False;
  91
  92         for (i = 0; i < argc; i++)
  93                 child_argv[i] = argv[i];
  94         child_argv[i++] = "--for-real";
  95         child_argv[i] = NULL;
  96
  97         for (;;) {
  98                 last_start = time(NULL);
  99
 100                 /* Start Window Maker */
 101                 pid = fork();
 102                 if (pid == 0) {
 103                         execvp(child_argv[0], child_argv);
 104                         wsyserror(_("Error respawning Window Maker"));
 105                         exit(1);
 106                 } else if (pid < 0) {
 107                         wsyserror(_("Error respawning Window Maker"));
 108                         exit(1);
 109                 }
 110
 111                 do {
 112                         if ((exited = waitpid(-1, &status, 0)) < 0) {
 113                                 wsyserror(_("Error during monitoring of Window Maker process."));
 114                                 error = True;
 115                                 break;
 116                         }
 117                 } while (exited != pid);
 118
 119                 if (error)
 120                         break;
 121
 122                 child_argv[argc] = "--for-real-";
 123
 124                 /* Check if the wmaker process exited due to a crash */
 125                 if (WIFSIGNALED(status) &&
 126                     (WTERMSIG(status) == SIGSEGV ||
 127                      WTERMSIG(status) == SIGBUS ||
 128                      WTERMSIG(status) == SIGILL || WTERMSIG(status) == SIGABRT || WTERMSIG(status) == SIGFPE)) {
 129                         /* If so, we check when was the last restart.
 130                          * If it was less than 3s ago, it's a bad sign, so we show
 131                          * the crash panel and ask the user what to do */
 132                         if (time(NULL) - last_start < 3) {
 133                                 if (showCrashDialog(WTERMSIG(status)) == 0) {
 134                                         return 1;
 135                                 }
 136                         }
 137                         wwarning(_("Window Maker exited due to a crash (signal %i) and will be restarted."),
 138                                  WTERMSIG(status));
 139                 } else
 140                         break;
 141         }
 142         return 0;
 143 }