misc.c

   1 /* evilwm - Minimalist Window Manager for X
   2  * Copyright (C) 1999-2009 Ciaran Anscomb <evilwm@6809.org.uk>
   3  * see README for license and other details. */
   4
   5 #include <X11/Xproto.h>
   6 #include <stdlib.h>
   7 #include <stdarg.h>
   8 #include <signal.h>
   9 #include <sys/wait.h>
  10 #include <unistd.h>
  11 #include "evilwm.h"
  12 #include "log.h"
  13
  14 int need_client_tidy = 0;
  15 int ignore_xerror = 0;
  16
  17 /* Now do this by fork()ing twice so we don't have to worry about SIGCHLDs */
  18 void spawn(const char *const cmd[]) {
  19         ScreenInfo *current_screen = find_current_screen();
  20         pid_t pid;
  21
  22         if (current_screen && current_screen->display)
  23                 putenv(current_screen->display);
  24         if (!(pid = fork())) {
  25                 setsid();
  26                 switch (fork()) {
  27                         /* Expect compiler warnings because of half-broken SUS
  28                          * execvp prototype:  "char *const argv[]" should have
  29                          * been "const char *const argv[]", but the committee
  30                          * favored legacy code over modern code, and modern
  31                          * compilers bark at our extra const. (LD) */
  32                         case 0: execvp(cmd[0], cmd+1);
  33                         default: _exit(0);
  34                 }
  35         }
  36         if (pid > 0)
  37                 wait(NULL);
  38 }
  39
  40 void handle_signal(int signo) {
  41         (void)signo;  /* unused */
  42         wm_exit = 1;
  43 }
  44
  45 int handle_xerror(Display *dsply, XErrorEvent *e) {
  46         Client *c;
  47         (void)dsply;  /* unused */
  48
  49         LOG_ENTER("handle_xerror(error=%d, request=%d/%d, resourceid=%lx)", e->error_code, e->request_code, e->minor_code, e->resourceid);
  50
  51         if (ignore_xerror) {
  52                 LOG_DEBUG("ignoring...\n");
  53                 LOG_LEAVE();
  54                 return 0;
  55         }
  56         /* If this error actually occurred while setting up the new
  57          * window, best let make_new_client() know not to bother */
  58         if (initialising != None && e->resourceid == initialising) {
  59                 LOG_DEBUG("error caught while initialising window=%lx\n", initialising);
  60                 initialising = None;
  61                 LOG_LEAVE();
  62                 return 0;
  63         }
  64         if (e->error_code == BadAccess && e->request_code == X_ChangeWindowAttributes) {
  65                 LOG_ERROR("root window unavailable (maybe another wm is running?)\n");
  66                 exit(1);
  67         }
  68
  69         c = find_client(e->resourceid);
  70         if (c) {
  71                 LOG_DEBUG("flagging client for removal\n");
  72                 c->remove = 1;
  73                 need_client_tidy = 1;
  74         } else {
  75                 LOG_DEBUG("unknown error: not handling\n");
  76         }
  77         LOG_LEAVE();
  78         return 0;
  79 }