wmfu/extra/xhookey.c

   1 /*
   2  * Copyright (c) 2007 Daniel Borca  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19
  20 #include <ctype.h>
  21 #include <errno.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <sys/wait.h>
  26 #include <unistd.h>
  27 #include <X11/Xlib.h>
  28
  29 #include "xhookey.h"
  30
  31
  32 #define LOG(x)  printf x
  33
  34
  35 static void
  36 grab_key (Display *dpy, KeyCode keycode, unsigned int modifier, Window win)
  37 {
  38     XGrabKey(dpy, keycode, modifier, (win ? win : DefaultRootWindow(dpy)),
  39              False, GrabModeAsync, GrabModeAsync);
  40 }
  41
  42
  43 int
  44 xhk_grab (Display *dpy, int num, KTUPLE keys[])
  45 {
  46     int screen = DefaultScreen(dpy);
  47     for (screen = 0; screen < ScreenCount(dpy); screen++) {
  48         int i;
  49         for (i = 0; i < num; i++) {
  50             grab_key(dpy, keys[i].key, keys[i].mod, RootWindow(dpy, screen));
  51         }
  52     }
  53     return 0;
  54 }
  55
  56
  57 void
  58 xhk_ungrab (Display *dpy)
  59 {
  60     int screen = DefaultScreen(dpy);
  61     for (screen = 0; screen < ScreenCount(dpy); screen++) {
  62         XUngrabKey(dpy, AnyKey, AnyModifier, RootWindow(dpy, screen));
  63     }
  64 }
  65
  66
  67 int
  68 xhk_parse (int argc, char **argv, KTUPLE **out_keys)
  69 {
  70     int i = 0;
  71     KTUPLE *keys;
  72
  73     keys = malloc((argc - 1) * sizeof(KTUPLE));
  74     if (keys == NULL) {
  75         return -1;
  76     }
  77
  78     while (--argc) {
  79         const char *p = *++argv;
  80         if (!strncmp(p, "-key=", 5)) {
  81             char *q;
  82             errno = 0;
  83             p += 5;
  84             keys[i].mod = 0;
  85             for (;;) {
  86                 if (!strncmp(p, "Shift+", 6)) {
  87                     p += 6;
  88                     keys[i].mod |= ShiftMask;
  89                     continue;
  90                 }
  91                 if (!strncmp(p, "Control+", 8)) {
  92                     p += 8;
  93                     keys[i].mod |= ControlMask;
  94                     continue;
  95                 }
  96                 if (!strncmp(p, "Alt+", 4)) {
  97                     p += 4;
  98                     keys[i].mod |= Mod1Mask;
  99                     continue;
 100                 }
 101                 break;
 102             }
 103             keys[i].key = strtol(p, &q, 0);
 104             if (errno || q == p || !isspace(*q)) {
 105                 LOG(("ignoring `%s'\n", p));
 106                 continue;
 107             }
 108             while (isspace(*++q)) {
 109             }
 110             keys[i].command = q;
 111             LOG(("key%d: 0x%X+%d -> \"%s\"\n", i, keys[i].mod, keys[i].key, keys[i].command));
 112             i++;
 113         }
 114     }
 115
 116     if (i) {
 117         *out_keys = keys;
 118     } else {
 119         free(keys);
 120     }
 121     return i;
 122 }
 123
 124
 125 #if XHK_SIGFORK
 126 void
 127 xhk_sig_handler (int sig)
 128 {
 129     if (sig == SIGCHLD) {
 130         int status;
 131         pid_t child;
 132         /* if more than one child exits at approximately the same time, the signals may get merged. */
 133         while ((child = waitpid(-1, &status, WNOHANG)) > 0) {
 134             LOG(("pid %d exited\n", child));
 135         }
 136     }
 137 }
 138 #endif
 139
 140
 141 #if XHK_XERROR
 142 int
 143 xhk_eks_handler (Display *dpy, XErrorEvent *evt)
 144 {
 145     static int been_there_done_that = 0;
 146     if (!been_there_done_that) {
 147         been_there_done_that++;
 148         fprintf(stderr, "*** X ERROR %d\n", evt->error_code);
 149         (void)dpy;
 150     }
 151     return 0;
 152 }
 153 #endif
 154
 155
 156 static int
 157 display_env (Display *dpy)
 158 {
 159     const char *display_name = DisplayString(dpy);
 160     char *envstr = malloc(strlen(display_name) + 8 + 1);
 161     if (envstr != NULL) {
 162         strcat(strcpy(envstr, "DISPLAY="), display_name);
 163         putenv(envstr);
 164     }
 165 }
 166
 167
 168 static int
 169 run_command (Display *dpy, KTUPLE *key)
 170 {
 171     pid_t pid;
 172
 173 #if XHK_SIGFORK
 174
 175     pid = fork();
 176     if (pid < 0) {
 177         return -1;
 178     }
 179     if (pid == 0) {
 180         if (setsid() < 0) {
 181             exit(-1);
 182         }
 183         display_env(dpy);
 184         exit(execlp("sh", "sh", "-c", key->command, (char *)0));
 185     }
 186
 187     return 0;
 188
 189 #else   /* !XHK_SIGFORK */
 190
 191     int status;
 192
 193     pid = fork();
 194     if (pid < 0) {
 195         return -1;
 196     }
 197     if (pid == 0) {
 198         if (setsid() < 0) {
 199             exit(-1);
 200         }
 201         /* fork again and exit, so that init(1) reaps the grandchildren */
 202         pid = fork();
 203         if (pid < 0) {
 204             exit(-1);
 205         }
 206         if (pid > 0) {
 207             exit(0);
 208         }
 209         display_env(dpy);
 210         exit(execlp("sh", "sh", "-c", key->command, (char *)0));
 211     }
 212     waitpid(pid, &status, 0);
 213
 214     return WEXITSTATUS(status);
 215
 216 #endif  /* !XHK_SIGFORK */
 217 }
 218
 219
 220 int
 221 xhk_run (Display *dpy, XEvent *evt, int num, KTUPLE keys[])
 222 {
 223     if (evt->type == KeyPress) {
 224         int i;
 225         unsigned int mod = evt->xkey.state & (ShiftMask | ControlMask | Mod1Mask);
 226         for (i = 0; i < num; i++) {
 227             if (evt->xkey.keycode == keys[i].key && mod == keys[i].mod) {
 228                 LOG(("key: 0x%X+%d, cmd: %s\n", keys[i].mod, keys[i].key, keys[i].command));
 229                 return run_command(dpy, &keys[i]);
 230             }
 231         }
 232     }
 233     return -1;
 234 }