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 #include <X11/Xutil.h>
  22 #include <X11/Xatom.h>
  23 #include <X11/extensions/Xinerama.h>
  24 #include <sys/wait.h>
  25
  26 #include "config.h"
  27 #include "util.h"
  28 #include "xutil.h"
  29 #include "screen.h"
  30
  31 extern AwesomeConf globalconf;
  32
  33 /** Execute another process, replacing the current instance of Awesome
  34  * \param screen Screen ID
  35  * \param arg Command
  36  * \ingroup ui_callback
  37  */
  38 void
  39 uicb_exec(int screen __attribute__ ((unused)), char *arg)
  40 {
  41     char path[PATH_MAX];
  42     if(globalconf.display)
  43         close(ConnectionNumber(globalconf.display));
  44
  45     sscanf(arg, "%s", path);
  46     execlp(path, arg, NULL);
  47 }
  48
  49 /** Spawn another process
  50  * \param screen Screen ID
  51  * \param arg Command
  52  * \ingroup ui_callback
  53  */
  54 void
  55 uicb_spawn(int screen, char *arg)
  56 {
  57     static char *shell = NULL;
  58     char *display = NULL;
  59     char *tmp, newdisplay[128];
  60
  61     if(!shell && !(shell = getenv("SHELL")))
  62         shell = a_strdup("/bin/sh");
  63     if(!arg)
  64         return;
  65
  66     if(!XineramaIsActive(globalconf.display) && (tmp = getenv("DISPLAY")))
  67     {
  68         display = a_strdup(tmp);
  69         if((tmp = strrchr(display, '.')))
  70             *tmp = '\0';
  71         snprintf(newdisplay, sizeof(newdisplay), "%s.%d", display, screen);
  72         setenv("DISPLAY", newdisplay, 1);
  73     }
  74
  75
  76     /* The double-fork construct avoids zombie processes and keeps the code
  77      * clean from stupid signal handlers. */
  78     if(fork() == 0)
  79     {
  80         if(fork() == 0)
  81         {
  82             if(globalconf.display)
  83                 close(ConnectionNumber(globalconf.display));
  84             setsid();
  85             execl(shell, shell, "-c", arg, (char *) NULL);
  86             warn("execl '%s -c %s'", shell, arg);
  87             perror(" failed");
  88         }
  89         exit(EXIT_SUCCESS);
  90     }
  91     wait(0);
  92 }
  93
  94 Bool
  95 xgettextprop(Window w, Atom atom, char *text, ssize_t textlen)
  96 {
  97     char **list = NULL;
  98     int n;
  99
 100     XTextProperty name;
 101
 102     if(!text || !textlen)
 103         return False;
 104
 105     text[0] = '\0';
 106     XGetTextProperty(globalconf.display, w, &name, atom);
 107
 108     if(!name.nitems)
 109         return False;
 110
 111     if(name.encoding == XA_STRING)
 112         a_strncpy(text, textlen, (char *) name.value, textlen - 1);
 113
 114     else if(XmbTextPropertyToTextList(globalconf.display, &name, &list, &n) >= Success && n > 0 && *list)
 115     {
 116         a_strncpy(text, textlen, *list, textlen - 1);
 117         XFreeStringList(list);
 118     }
 119
 120     text[textlen - 1] = '\0';
 121     XFree(name.value);
 122
 123     return True;
 124 }
 125
 126
 127 /** Initialize an X color
 128  * \param screen Screen number
 129  * \param colstr Color specification
 130  */
 131 XColor
 132 initxcolor(int phys_screen, const char *colstr)
 133 {
 134     XColor screenColor, exactColor;
 135
 136     if(!XAllocNamedColor(globalconf.display,
 137                          DefaultColormap(globalconf.display, phys_screen),
 138                          colstr,
 139                          &screenColor,
 140                          &exactColor))
 141         eprint("awesome: error, cannot allocate color '%s'\n", colstr);
 142
 143     return screenColor;
 144 }
 145
 146 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80