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/* This program was created using this as a reference: https://jan.newmarch.name/Wayland/ProgrammingClient/
*
* wayland-run-on-new-display runs a command each time a new display is attached.
*
* Copyright (C) 2021 Robby Zambito
*
* 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 3 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wayland-client.h>
#define STREQ(a, b) (strcmp(a, b) == 0)
static char **command_argv;
static void global_registry_handler(void *data, struct wl_registry *registry,
uint32_t id, const char *interface,
uint32_t version) {
/* A new display has been attached */
if (STREQ(interface, "wl_output")) {
errno = 0;
switch (fork()) {
case -1: /* Handle error */
perror("Unable to fork");
break;
case 0: /* In child */
execvp(command_argv[0], command_argv);
/* No need to break, the exec leaves the current program. */
default:;
}
}
}
static void global_registry_remover(void *data, struct wl_registry *registry,
uint32_t id) {
/* Do nothing. */
}
int main(int argc, char **argv) {
command_argv = argv + 1;
struct wl_display *display = wl_display_connect(NULL);
if (display == NULL) {
fputs("Failed to connect to the Wayland socket", stderr);
exit(EXIT_FAILURE);
}
const struct wl_registry_listener registry_listener = {
global_registry_handler,
global_registry_remover,
};
struct wl_registry *registry = wl_display_get_registry(display);
wl_registry_add_listener(registry, ®istry_listener, NULL);
for (;;) {
wl_display_dispatch(display);
wl_display_roundtrip(display);
}
wl_display_disconnect(display);
return EXIT_SUCCESS;
}
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