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/*
* Helper to run programs on X11 keyboard events.
*
* Copyright (C) 2016 Michael Buesch <m@bues.ch>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <X11/Xlib.h>
#include <X11/extensions/XInput2.h>
#define PFX "execonkp: "
static void handle_event(char * const * run_prog)
{
printf(PFX "Key event detected. Running %s...\n", run_prog[0]);
execv(run_prog[0], run_prog);
fprintf(stderr, PFX "execv(\"%s\") failed: %s\n",
run_prog[0], strerror(errno));
exit(1);
}
static void signal_handler(int signal)
{
printf(PFX "terminated\n");
exit(0);
}
static int install_sighandler(int signal, void (*handler)(int))
{
struct sigaction act;
memset(&act, 0, sizeof(act));
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
act.sa_handler = handler;
return sigaction(signal, &act, NULL);
}
static void usage(void)
{
printf("Usage: execonkp [OPTIONS] COMMAND [ARGS]\n");
printf("\n");
printf("Options:\n");
printf(" -p|--on-press Run the command on key press.\n");
printf(" -r|--on-release Run the command on key release.\n");
printf("\n");
printf("By default only -p is set.\n");
printf("Setting -r clears -p unless -p is also specified afterwards.\n");
}
int main(int argc, char **argv)
{
Display *display;
Window window;
XIEventMask evmask;
unsigned char evmask_bits[(XI_LASTEVENT + 8) / 8] = { 0, };
int res, tmp0, tmp1, xi_opcode;
sigset_t sigset;
char * const * run_prog;
int on_press = 1, on_release = 0;
argc--;
argv++;
while (argc >= 1 && argv[0][0] == '-') {
if (strcmp(argv[0], "-p") == 0 ||
strcmp(argv[0], "--on-press") == 0) {
on_press = 1;
} else if (strcmp(argv[0], "-r") == 0 ||
strcmp(argv[0], "--on-release") == 0) {
on_press = 0;
on_release = 1;
} else {
usage();
return 1;
}
argc--;
argv++;
}
if (argc < 1) {
usage();
return 1;
}
run_prog = argv;
display = XOpenDisplay(NULL);
if (!display) {
/* Fallback to the first display. */
display = XOpenDisplay(":0");
if (!display) {
fprintf(stderr, PFX "Failed to open DISPLAY\n");
return 1;
}
}
window = DefaultRootWindow(display);
res = XQueryExtension(display, "XInputExtension", &xi_opcode, &tmp0, &tmp1);
if (!res) {
fprintf(stderr, PFX "X Input extension not available.\n");
return 1;
}
sigemptyset(&sigset);
res = sigprocmask(SIG_SETMASK, &sigset, NULL);
res |= install_sighandler(SIGINT, signal_handler);
res |= install_sighandler(SIGTERM, signal_handler);
if (res) {
fprintf(stderr, PFX "Failed to setup signal handlers\n");
return 1;
}
if (on_press)
XISetMask(evmask_bits, XI_KeyPress);
if (on_release)
XISetMask(evmask_bits, XI_KeyRelease);
memset(&evmask, 0, sizeof(evmask));
evmask.deviceid = XIAllDevices;
evmask.mask_len = sizeof(evmask_bits);
evmask.mask = evmask_bits;
res = XISelectEvents(display, window, &evmask, 1);
if (res != Success) {
fprintf(stderr, PFX "Failed to set event mask (%d)\n", res);
return 1;
}
printf(PFX "Waiting for keyboard event...\n");
while (1) {
XEvent ev;
XGenericEventCookie *cookie = &ev.xcookie;
XNextEvent(display, &ev);
if (XGetEventData(display, cookie) &&
cookie->type == GenericEvent &&
cookie->extension == xi_opcode) {
handle_event(run_prog);
}
XFreeEventData(display, cookie);
}
}
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