#include #include #include #include #include #include #include #include #include #include "backend.h" #include "log.h" struct backend_noop { struct libseat base; struct libseat_seat_listener *seat_listener; void *seat_listener_data; bool initial_setup; int sockets[2]; }; extern const struct seat_impl noop_impl; static struct backend_noop *backend_noop_from_libseat_backend(struct libseat *base) { assert(base->impl == &noop_impl); return (struct backend_noop *)base; } static void destroy(struct backend_noop *backend) { close(backend->sockets[0]); close(backend->sockets[1]); free(backend); } static int close_seat(struct libseat *base) { struct backend_noop *backend = backend_noop_from_libseat_backend(base); destroy(backend); return 0; } static int disable_seat(struct libseat *base) { (void)base; return 0; } static const char *seat_name(struct libseat *base) { (void)base; return "noop"; } static int open_device(struct libseat *base, const char *path, int *fd) { (void)base; int tmpfd = open(path, O_RDWR | O_CLOEXEC); if (tmpfd < 0) { log_errorf("Failed to open device: %s", strerror(errno)); return -1; } *fd = tmpfd; return tmpfd; } static int close_device(struct libseat *base, int device_id) { (void)base; (void)device_id; return 0; } static int switch_session(struct libseat *base, int s) { (void)base; (void)s; log_errorf("No-op backend cannot switch to session %d", s); return -1; } static int get_fd(struct libseat *base) { struct backend_noop *backend = backend_noop_from_libseat_backend(base); return backend->sockets[0]; } static int dispatch_background(struct libseat *base, int timeout) { struct backend_noop *backend = backend_noop_from_libseat_backend(base); if (backend->initial_setup) { backend->initial_setup = false; backend->seat_listener->enable_seat(&backend->base, backend->seat_listener_data); } struct pollfd fd = { .fd = backend->sockets[0], .events = POLLIN, }; if (poll(&fd, 1, timeout) < 0) { if (errno == EAGAIN || errno == EINTR) { return 0; } else { return -1; } } return 0; } static struct libseat *noop_open_seat(struct libseat_seat_listener *listener, void *data) { struct backend_noop *backend = calloc(1, sizeof(struct backend_noop)); if (backend == NULL) { return NULL; } if (socketpair(AF_UNIX, SOCK_STREAM, 0, backend->sockets) != 0) { log_errorf("socketpair() failed: %s", strerror(errno)); free(backend); return NULL; } backend->seat_listener = listener; backend->seat_listener_data = data; backend->base.impl = &noop_impl; return &backend->base; } const struct seat_impl noop_impl = { .open_seat = noop_open_seat, .disable_seat = disable_seat, .close_seat = close_seat, .seat_name = seat_name, .open_device = open_device, .close_device = close_device, .switch_session = switch_session, .get_fd = get_fd, .dispatch = dispatch_background, };