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#include <libudev.h>
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
#include <sys/epoll.h>
#include <stdbool.h>
#include <unistd.h>
#include <sys/types.h>
#include <string.h>
#include <sys/wait.h>
#include <signal.h>
#include <errno.h>
#define EPOLL_EVENTS 8
/*Open a connection with the current wayland compositor if it exists
* A fd is provided which can be polled. When polling the fd returns an error
* send a signal to any children and terminate.
*/
bool TERMINATE = false;
int fork_and_wait() {
pid_t pid = fork();
assert(pid != -1);
if(pid == 0) {
/*There's a race condition with adb...*/
sleep(2);
return execlp("scrcpy", "scrcpy", (char *) 0);
}
int status;
pid_t _pid;
do {
_pid = waitpid(pid, &status, WNOHANG);
} while (pid != _pid && !TERMINATE);
int exit_status = WEXITSTATUS(status);
return exit_status;
}
void handle_hup(int sig) {
printf("poll-phone: %d\n", sig);
signal(sig, SIG_IGN);
kill(0, SIGHUP);
TERMINATE = true;
}
/*Refactor this so we poll the signal handlers*/
int main(int argc, char **argv) {
struct epoll_event events[EPOLL_EVENTS];
int epfd = epoll_create(EPOLL_EVENTS);
struct udev *_udev = udev_new();
assert(_udev != NULL);
struct udev_monitor *_monitor = udev_monitor_new_from_netlink(_udev, "udev");
assert(_monitor != NULL);
udev_monitor_enable_receiving(_monitor);
int fd = udev_monitor_get_fd(_monitor);
struct epoll_event event;
event.events = EPOLLIN;
epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &event);
signal(SIGTERM, handle_hup);
signal(SIGINT, handle_hup);
fork_and_wait();
while(!TERMINATE) {
int state = epoll_wait(epfd, &events[0], EPOLL_EVENTS, -1);
if(state == EINTR) { break; }
else { exit(-1); }
struct udev_device *device = udev_monitor_receive_device(_monitor);
const char *action = udev_device_get_action(device);
udev_device_unref(device);
if(!strcmp(action, "bind")) {
fork_and_wait();
}
}
udev_monitor_unref(_monitor);
udev_unref(_udev);
return 0;
}
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