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296 lines
7.1 KiB
296 lines
7.1 KiB
/* Standard stuff */
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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/* Standard errors */
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#include <errno.h>
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/* Directory and file control */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <unistd.h>
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/* Polling */
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#include <poll.h>
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/* Signaling */
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#include <signal.h>
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/* Process wait */
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#include <sys/wait.h>
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#define test_bit(yalv, abs_b) ((((char *)abs_b)[yalv/8] & (1<<yalv%8)) > 0)
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/* Determine dependencies based on platform */
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#ifdef __linux__
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#define OS linux
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#include <linux/input.h>
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#include <sys/epoll.h>
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#endif
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#ifdef __FreeBSD__
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#define OS bsd
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#include <dev/evdev/input.h>
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#endif
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#ifndef OS
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#define OS unix
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#endif
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struct pressed_buffer {
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unsigned short *buf;
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unsigned int size;
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};
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int term = 0; // exit flag
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const char ev_root[] = "/dev/input/";
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int pressBufferAdd (struct pressed_buffer*, unsigned short);
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int pressBufferRemove (struct pressed_buffer*, unsigned short);
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void termHandler (int signum);
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void die (void);
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void execCommand(const char *);
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// TODO: use getopts() to parse command line options
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int main (void)
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{
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/* Handle SIGINT */
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term = 0;
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struct sigaction action;
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memset(&action, 0, sizeof(action));
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action.sa_handler = termHandler;
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sigaction(SIGINT, &action, NULL);
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/* Open the event directory */
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DIR *ev_dir = opendir(ev_root);
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if (!ev_dir)
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die();
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int fd_num = 0;
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struct pollfd *fds = NULL;
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for (;;) {
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struct dirent *file_ent;
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char ev_path[sizeof(ev_root) + NAME_MAX + 1];
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void *tmp_p;
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int tmp_fd;
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unsigned char evtype_b[EV_MAX];
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if ((file_ent = readdir(ev_dir)) == NULL)
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break;
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/* Filter out non character devices */
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if (file_ent->d_type != DT_CHR)
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continue;
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/* Compose absolute path from relative */
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strncpy(ev_path, ev_root, sizeof(ev_root) + NAME_MAX);
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strncat(ev_path, file_ent->d_name, sizeof(ev_root) + NAME_MAX);
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/* Open device and check if it can give key events otherwise ignore it */
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tmp_fd = open(ev_path, O_RDONLY | O_NONBLOCK);
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if (tmp_fd < 0) {
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fprintf(stderr, "Could not open device %s\n", ev_path);
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continue;
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}
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memset(evtype_b, 0, sizeof(evtype_b));
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if (ioctl(tmp_fd, EVIOCGBIT(0, EV_MAX), evtype_b) < 0) {
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fprintf(stderr, "Could not read capabilities of device %s\n",
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ev_path);
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close(tmp_fd);
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continue;
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}
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if (!test_bit(EV_KEY, evtype_b)) {
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fprintf(stderr, "Ignoring device %s\n", ev_path);
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close(tmp_fd);
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continue;
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}
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tmp_p = realloc(fds, sizeof(struct pollfd) * (fd_num + 1));
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if (!tmp_p)
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die();
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fds = tmp_p;
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fds[fd_num].events = POLLIN;
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fds[fd_num].fd = tmp_fd;
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fd_num++;
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}
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closedir(ev_dir);
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if (!fd_num) {
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fputs("Could not open any device, exiting\n", stderr);
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exit(-1);
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}
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// TODO: watch for events inside /dev/input and reload accordingly
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// could use the epoll syscall or the inotify API (linux),
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// event API (openbsd), kqueue syscall (BSD and macos), a separate
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// process or some polling system inside the main loop to maintain
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// portability across other *NIX derivatives, could also use libev
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struct input_event event;
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struct pressed_buffer pb = {NULL, 0}; // Pressed keys buffer
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ssize_t rb; // Read bits
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/* Prepare for using epoll */
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#if OS == linux
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struct epoll_event epoll_read_ev;
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epoll_read_ev.events = EPOLLIN;
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int ev_fd = epoll_create(1);
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if (ev_fd < 0)
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die();
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for (int i = 0; i < fd_num; i++)
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if (epoll_ctl(ev_fd, EPOLL_CTL_ADD, fds[i].fd, &epoll_read_ev) < 0)
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die();
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#endif
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for (;;) {
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// TODO: better error reporting
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/* On linux use epoll(2) as it gives better performance */
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#if OS == linux
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static struct epoll_event ev_type;
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if (epoll_wait(ev_fd, &ev_type, fd_num, -1) == -1 || term)
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break;
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// TODO: use and test kqueue(2) for BSD systems
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/* On other systems use poll(2) to wait por a file dscriptor
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* to become ready for reading. */
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#else // TODO: add unix and bsd cases
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if (poll(fds, fd_num, -1) != -1 || term)
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break;
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#endif
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static int i;
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static unsigned int prev_size;
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prev_size = pb.size;
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for (i = 0; i < fd_num; i++) {
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#if OS == linux
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if (ev_type.events == EPOLLIN) {
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#else // TODO: add unix and bsd cases
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if (fds[i].revents == fds[i].events) {
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#endif
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rb = read(fds[i].fd, &event, sizeof(struct input_event));
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if (rb != sizeof(struct input_event)) continue;
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/* Ignore touchpad events */
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// TODO: make a event blacklist system
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if (
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event.type == EV_KEY &&
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event.code != BTN_TOUCH &&
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event.code != BTN_TOOL_FINGER &&
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event.code != BTN_TOOL_DOUBLETAP &&
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event.code != BTN_TOOL_TRIPLETAP
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) {
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switch (event.value) {
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/* Key released */
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case (0):
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pressBufferRemove(&pb, event.code);
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break;
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/* Key pressed */
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case (1):
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pressBufferAdd(&pb, event.code);
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break;
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}
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}
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}
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}
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if (pb.size != prev_size) {
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printf("Pressed keys: ");
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for (unsigned int i = 0; i < pb.size; i++)
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printf("%d ", pb.buf[i]);
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putchar('\n');
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if (pb.size == 2)
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if (pb.buf[0] == 56 || pb.buf[0] == 31)
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if (pb.buf[1] == 31 || pb.buf[1] == 56)
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execCommand("/home/ale/hello");
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}
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}
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// TODO: better child handling, for now all children receive the same
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// interrupts as the father so everything should work fine for now
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wait(NULL);
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free(pb.buf);
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if (!term)
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fputs("An error occured\n", stderr);
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for (int i = 0; i < fd_num; i++) {
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if (close(fds[i].fd) == -1) die();
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}
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return 0;
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}
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// TODO: optimize functions to preallocate some memory
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int pressBufferAdd (struct pressed_buffer *pb, unsigned short key)
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{
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/* Adds a keycode to the pressed buffer if it is not already present
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* Returns non zero if the key was not added. */
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if (!pb) return 1;
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if (pb->buf != NULL) {
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/* Linear search if the key is already buffered */
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for (unsigned int i = 0; i < pb->size; i++)
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if (key == pb->buf[i]) return 1;
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}
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unsigned short *b;
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b = realloc(pb->buf, sizeof(unsigned short) * (pb->size + 1));
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if (!b) {
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fprintf(stderr, "realloc failed in pressBufferAdd: %s", strerror(errno));
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exit(errno);
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}
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pb->buf = b;
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pb->buf[pb->size++] = key;
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return 0;
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}
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int pressBufferRemove (struct pressed_buffer *pb, unsigned short key)
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{
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/* Removes a keycode from a pressed buffer if it is present returns
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* non zero in case of failure (key not present or buffer empty). */
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if (!pb) return 1;
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for (unsigned int i = 0; i < pb->size; i++) {
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if (pb->buf[i] == key) {
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pb->size--;
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pb->buf[i] = pb->buf[pb->size];
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unsigned short *b;
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b = realloc(pb->buf, sizeof(unsigned short) * pb->size);
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if (!b && pb->size) {
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fprintf(stderr, "realloc failed in pressBufferRemove: %s",
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strerror(errno));
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exit(errno);
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}
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pb->buf = b;
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return 0;
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}
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}
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return 1;
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}
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void termHandler (int signum)
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{
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fputs("Received interrupt signal, exiting gracefully...\n", stderr);
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term = 1;
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}
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void die (void)
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{
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fputs(strerror(errno), stderr);
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exit(errno);
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}
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void execCommand (const char *path)
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{
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pid_t child_pid = fork();
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if (child_pid == -1) die();
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// TODO: communication between parent and child about process status/errors/etc
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if (!child_pid) {
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/* we are the child */
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int ret = 0;
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ret = execl(path, path, (char *) NULL);
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if (ret != 0)
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exit(-1);
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}
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}
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