xutil.c

   1 /*
   2  * xutil.c - X-related useful functions
   3  *
   4  * Copyright © 2007 Julien Danjou <julien@danjou.info>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  */
  21
  22 #include <X11/Xutil.h>
  23 #include <X11/Xatom.h>
  24 #include <X11/extensions/Xinerama.h>
  25 #include <sys/wait.h>
  26
  27 #include "structs.h"
  28 #include "xutil.h"
  29
  30 extern AwesomeConf globalconf;
  31
  32 /** Execute another process, replacing the current instance of Awesome
  33  * \param screen Screen ID
  34  * \param arg Command
  35  * \ingroup ui_callback
  36  */
  37 void
  38 uicb_exec(int screen __attribute__ ((unused)), char *arg)
  39 {
  40     char path[PATH_MAX];
  41     if(globalconf.display)
  42         close(ConnectionNumber(globalconf.display));
  43
  44     sscanf(arg, "%s", path);
  45     execlp(path, arg, NULL);
  46 }
  47
  48 /** Spawn another process
  49  * \param screen Screen ID
  50  * \param arg Command
  51  * \ingroup ui_callback
  52  */
  53 void
  54 uicb_spawn(int screen, char *arg)
  55 {
  56     static char *shell = NULL;
  57     char *display = NULL;
  58     char *tmp, newdisplay[128];
  59
  60     if(!shell && !(shell = getenv("SHELL")))
  61         shell = a_strdup("/bin/sh");
  62     if(!arg)
  63         return;
  64
  65     if(!XineramaIsActive(globalconf.display) && (tmp = getenv("DISPLAY")))
  66     {
  67         display = a_strdup(tmp);
  68         if((tmp = strrchr(display, '.')))
  69             *tmp = '\0';
  70         snprintf(newdisplay, sizeof(newdisplay), "%s.%d", display, screen);
  71         setenv("DISPLAY", newdisplay, 1);
  72     }
  73
  74
  75     /* The double-fork construct avoids zombie processes and keeps the code
  76      * clean from stupid signal handlers. */
  77     if(fork() == 0)
  78     {
  79         if(fork() == 0)
  80         {
  81             if(globalconf.display)
  82                 close(ConnectionNumber(globalconf.display));
  83             setsid();
  84             execl(shell, shell, "-c", arg, (char *) NULL);
  85             warn("execl '%s -c %s'", shell, arg);
  86             perror(" failed");
  87         }
  88         exit(EXIT_SUCCESS);
  89     }
  90     wait(0);
  91 }
  92
  93 Bool
  94 xgettextprop(Window w, Atom atom, char *text, ssize_t textlen)
  95 {
  96     char **list = NULL;
  97     int n;
  98
  99     XTextProperty name;
 100
 101     if(!text || !textlen)
 102         return False;
 103
 104     text[0] = '\0';
 105     XGetTextProperty(globalconf.display, w, &name, atom);
 106
 107     if(!name.nitems)
 108         return False;
 109
 110     if(name.encoding == XA_STRING)
 111         a_strncpy(text, textlen, (char *) name.value, textlen - 1);
 112
 113     else if(XmbTextPropertyToTextList(globalconf.display, &name, &list, &n) >= Success && n > 0 && *list)
 114     {
 115         a_strncpy(text, textlen, *list, textlen - 1);
 116         XFreeStringList(list);
 117     }
 118
 119     text[textlen - 1] = '\0';
 120     XFree(name.value);
 121
 122     return True;
 123 }
 124
 125 unsigned int
 126 get_numlockmask(Display *disp)
 127 {
 128     XModifierKeymap *modmap;
 129     unsigned int mask = 0;
 130     int i, j;
 131
 132     modmap = XGetModifierMapping(disp);
 133     for(i = 0; i < 8; i++)
 134         for(j = 0; j < modmap->max_keypermod; j++)
 135             if(modmap->modifiermap[i * modmap->max_keypermod + j]
 136                == XKeysymToKeycode(disp, XK_Num_Lock))
 137                 mask = (1 << i);
 138
 139     XFreeModifiermap(modmap);
 140
 141     return mask;
 142 }
 143
 144 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80