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 along
  18  *  with this program; if not, write to the Free Software Foundation, Inc.,
  19  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include "wconfig.h"
  23 #include <unistd.h>
  24 #include <stdlib.h>
  25 #include <time.h>
  26 #include <signal.h>
  27 #include <sys/wait.h>
  28 #ifdef __FreeBSD__
  29 #include <sys/signal.h>
  30 #endif
  31
  32 #include <X11/Xlib.h>
  33 #include <X11/Xutil.h>
  34 #include <X11/Xproto.h>
  35
  36 #include "WindowMaker.h"
  37 #include "screen.h"
  38 #include "window.h"
  39 #include "dialog.h"
  40 #include "main.h"
  41
  42 /****** Global Variables ******/
  43 extern WPreferences wPreferences;
  44
  45 int showCrashDialog(int sig)
  46 {
  47         int crashAction;
  48
  49         dpy = XOpenDisplay(NULL);
  50         if (dpy) {
  51 /* XXX TODO make sure that window states are saved and restored via netwm */
  52
  53                 XGrabServer(dpy);
  54                 crashAction = wShowCrashingDialogPanel(sig);
  55                 XCloseDisplay(dpy);
  56                 dpy = NULL;
  57         } else {
  58                 werror(_("cannot open connection for crashing dialog panel. Aborting."));
  59                 crashAction = WMAbort;
  60         }
  61
  62         if (crashAction == WMStartAlternate) {
  63                 int i;
  64
  65                 wmessage(_("trying to start alternate window manager..."));
  66
  67                 for (i = 0; i < WMGetArrayItemCount(wPreferences.fallbackWMs); i++) {
  68                         Restart(WMGetFromArray(wPreferences.fallbackWMs, i), False);
  69                 }
  70
  71                 wfatal(_("failed to start alternate window manager. Aborting."));
  72
  73                 return 0;
  74         } else if (crashAction == WMAbort)
  75                 return 0;
  76         else
  77                 return 1;
  78 }
  79
  80 int MonitorLoop(int argc, char **argv)
  81 {
  82         pid_t pid, exited;
  83         char **child_argv = wmalloc(sizeof(char *) * (argc + 2));
  84         int i, status;
  85         time_t last_start;
  86         Bool error = False;
  87
  88         for (i = 0; i < argc; i++)
  89                 child_argv[i] = argv[i];
  90         child_argv[i++] = "--for-real";
  91         child_argv[i] = NULL;
  92
  93         for (;;) {
  94                 last_start = time(NULL);
  95
  96                 /* Start Window Maker */
  97                 pid = fork();
  98                 if (pid == 0) {
  99                         execvp(child_argv[0], child_argv);
 100                         werror(_("Error respawning Window Maker"));
 101                         exit(1);
 102                 } else if (pid < 0) {
 103                         werror(_("Error respawning Window Maker"));
 104                         exit(1);
 105                 }
 106
 107                 do {
 108                         if ((exited = waitpid(-1, &status, 0)) < 0) {
 109                                 werror(_("Error during monitoring of Window Maker process."));
 110                                 error = True;
 111                                 break;
 112                         }
 113                 } while (exited != pid);
 114
 115                 if (error)
 116                         break;
 117
 118                 child_argv[argc] = "--for-real-";
 119
 120                 /* Check if the wmaker process exited due to a crash */
 121                 if (WIFSIGNALED(status) &&
 122                     (WTERMSIG(status) == SIGSEGV ||
 123                      WTERMSIG(status) == SIGBUS ||
 124                      WTERMSIG(status) == SIGILL || WTERMSIG(status) == SIGABRT || WTERMSIG(status) == SIGFPE)) {
 125                         /* If so, we check when was the last restart.
 126                          * If it was less than 3s ago, it's a bad sign, so we show
 127                          * the crash panel and ask the user what to do */
 128                         if (time(NULL) - last_start < 3) {
 129                                 if (showCrashDialog(WTERMSIG(status)) == 0) {
 130                                         return 1;
 131                                 }
 132                         }
 133                         wwarning(_("Window Maker exited due to a crash (signal %i) and will be restarted."),
 134                                  WTERMSIG(status));
 135                 } else
 136                         break;
 137         }
 138         return 0;
 139 }