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 "xutil.h"
  28 #include "client.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     Client *c;
  41     char path[PATH_MAX];
  42
  43     /* remap all clients since some WM won't handle them otherwise */
  44     for(c = globalconf.clients; c; c = c->next)
  45         client_unban(c);
  46
  47     XSync(globalconf.display, False);
  48
  49     if(globalconf.display)
  50         close(ConnectionNumber(globalconf.display));
  51
  52     sscanf(arg, "%s", path);
  53     execlp(path, arg, NULL);
  54 }
  55
  56 /** Spawn another process
  57  * \param screen Screen ID
  58  * \param arg Command
  59  * \ingroup ui_callback
  60  */
  61 void
  62 uicb_spawn(int screen, char *arg)
  63 {
  64     static char *shell = NULL;
  65     char *display = NULL;
  66     char *tmp, newdisplay[128];
  67
  68     if(!shell && !(shell = getenv("SHELL")))
  69         shell = a_strdup("/bin/sh");
  70     if(!arg)
  71         return;
  72
  73     if(!XineramaIsActive(globalconf.display) && (tmp = getenv("DISPLAY")))
  74     {
  75         display = a_strdup(tmp);
  76         if((tmp = strrchr(display, '.')))
  77             *tmp = '\0';
  78         snprintf(newdisplay, sizeof(newdisplay), "%s.%d", display, screen);
  79         setenv("DISPLAY", newdisplay, 1);
  80     }
  81
  82
  83     /* The double-fork construct avoids zombie processes and keeps the code
  84      * clean from stupid signal handlers. */
  85     if(fork() == 0)
  86     {
  87         if(fork() == 0)
  88         {
  89             if(globalconf.display)
  90                 close(ConnectionNumber(globalconf.display));
  91             setsid();
  92             execl(shell, shell, "-c", arg, (char *) NULL);
  93             warn("execl '%s -c %s'", shell, arg);
  94             perror(" failed");
  95         }
  96         exit(EXIT_SUCCESS);
  97     }
  98     wait(0);
  99 }
 100
 101 Bool
 102 xgettextprop(Window w, Atom atom, char *text, ssize_t textlen)
 103 {
 104     char **list = NULL;
 105     int n;
 106     XTextProperty name;
 107
 108     if(!text || !textlen)
 109         return False;
 110
 111     text[0] = '\0';
 112     XGetTextProperty(globalconf.display, w, &name, atom);
 113
 114     if(!name.nitems)
 115         return False;
 116
 117     if(name.encoding == XA_STRING)
 118         a_strncpy(text, textlen, (char *) name.value, textlen - 1);
 119
 120     else if(XmbTextPropertyToTextList(globalconf.display, &name, &list, &n) >= Success && n > 0 && *list)
 121     {
 122         a_strncpy(text, textlen, *list, textlen - 1);
 123         XFreeStringList(list);
 124     }
 125
 126     text[textlen - 1] = '\0';
 127     XFree(name.value);
 128
 129     return True;
 130 }
 131
 132 unsigned int
 133 get_numlockmask(Display *disp)
 134 {
 135     XModifierKeymap *modmap;
 136     unsigned int mask = 0;
 137     int i, j;
 138
 139     modmap = XGetModifierMapping(disp);
 140     for(i = 0; i < 8; i++)
 141         for(j = 0; j < modmap->max_keypermod; j++)
 142             if(modmap->modifiermap[i * modmap->max_keypermod + j]
 143                == XKeysymToKeycode(disp, XK_Num_Lock))
 144                 mask = (1 << i);
 145
 146     XFreeModifiermap(modmap);
 147
 148     return mask;
 149 }
 150
 151 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80