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
  43 static int showCrashDialog(int sig)
  44 {
  45         int crashAction;
  46
  47         dpy = XOpenDisplay(NULL);
  48         if (dpy) {
  49 /* XXX TODO make sure that window states are saved and restored via netwm */
  50
  51                 XGrabServer(dpy);
  52                 crashAction = wShowCrashingDialogPanel(sig);
  53                 XCloseDisplay(dpy);
  54                 dpy = NULL;
  55         } else {
  56                 werror(_("cannot open connection for crashing dialog panel. Aborting."));
  57                 crashAction = WMAbort;
  58         }
  59
  60         if (crashAction == WMStartAlternate) {
  61                 int i;
  62
  63                 wmessage(_("trying to start alternate window manager..."));
  64
  65                 for (i = 0; i < WMGetArrayItemCount(wPreferences.fallbackWMs); i++) {
  66                         Restart(WMGetFromArray(wPreferences.fallbackWMs, i), False);
  67                 }
  68
  69                 wfatal(_("failed to start alternate window manager. Aborting."));
  70
  71                 return 0;
  72         } else if (crashAction == WMAbort)
  73                 return 0;
  74         else
  75                 return 1;
  76 }
  77
  78 int MonitorLoop(int argc, char **argv)
  79 {
  80         pid_t pid, exited;
  81         char **child_argv = wmalloc(sizeof(char *) * (argc + 2));
  82         int i, status;
  83         time_t last_start;
  84         Bool error = False;
  85
  86         for (i = 0; i < argc; i++)
  87                 child_argv[i] = argv[i];
  88         child_argv[i++] = "--for-real";
  89         child_argv[i] = NULL;
  90
  91         for (;;) {
  92                 last_start = time(NULL);
  93
  94                 /* Start Window Maker */
  95                 pid = fork();
  96                 if (pid == 0) {
  97                         execvp(child_argv[0], child_argv);
  98                         werror(_("Error respawning Window Maker"));
  99                         exit(1);
 100                 } else if (pid < 0) {
 101                         werror(_("Error respawning Window Maker"));
 102                         exit(1);
 103                 }
 104
 105                 do {
 106                         if ((exited = waitpid(-1, &status, 0)) < 0) {
 107                                 werror(_("Error during monitoring of Window Maker process."));
 108                                 error = True;
 109                                 break;
 110                         }
 111                 } while (exited != pid);
 112
 113                 if (error)
 114                         break;
 115
 116                 child_argv[argc] = "--for-real-";
 117
 118                 /* Check if the wmaker process exited due to a crash */
 119                 if (WIFSIGNALED(status) &&
 120                     (WTERMSIG(status) == SIGSEGV ||
 121                      WTERMSIG(status) == SIGBUS ||
 122                      WTERMSIG(status) == SIGILL || WTERMSIG(status) == SIGABRT || WTERMSIG(status) == SIGFPE)) {
 123                         /* If so, we check when was the last restart.
 124                          * If it was less than 3s ago, it's a bad sign, so we show
 125                          * the crash panel and ask the user what to do */
 126                         if (time(NULL) - last_start < 3) {
 127                                 if (showCrashDialog(WTERMSIG(status)) == 0) {
 128                                         return 1;
 129                                 }
 130                         }
 131                         wwarning(_("Window Maker exited due to a crash (signal %i) and will be restarted."),
 132                                  WTERMSIG(status));
 133                 } else
 134                         break;
 135         }
 136         return 0;
 137 }