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#include <assert.h>
#include <errno.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "backend.h"
#include "libseat.h"
#include "log.h"
extern const struct seat_impl seatd_impl;
extern const struct seat_impl logind_impl;
extern const struct seat_impl builtin_impl;
extern const struct seat_impl noop_impl;
static const struct named_backend impls[] = {
#ifdef SEATD_ENABLED
{"seatd", &seatd_impl},
#endif
#ifdef LOGIND_ENABLED
{"logind", &logind_impl},
#endif
#ifdef BUILTIN_ENABLED
{"builtin", &builtin_impl},
#endif
{"noop", &noop_impl},
{NULL, NULL},
};
#if !defined(SEATD_ENABLED) && !defined(LOGIND_ENABLED) && !defined(BUILTIN_ENABLED)
#error At least one backend must be enabled
#endif
struct libseat *libseat_open_seat(const struct libseat_seat_listener *listener, void *data) {
if (listener == NULL || listener->enable_seat == NULL || listener->disable_seat == NULL) {
errno = EINVAL;
return NULL;
}
log_init();
char *backend_type = getenv("LIBSEAT_BACKEND");
if (backend_type != NULL) {
const struct named_backend *iter = impls;
while (iter->backend != NULL && strcmp(backend_type, iter->name) != 0) {
iter++;
}
if (iter == NULL || iter->backend == NULL) {
log_errorf("No backend matched name '%s'", backend_type);
errno = EINVAL;
return NULL;
}
struct libseat *backend = iter->backend->open_seat(listener, data);
if (backend == NULL) {
log_errorf("Backend '%s' failed to open seat: %s", iter->name,
strerror(errno));
return NULL;
}
log_infof("Seat opened with backend '%s'", iter->name);
return backend;
}
struct libseat *backend = NULL;
for (const struct named_backend *iter = impls; iter->backend != NULL; iter++) {
if (iter->backend == &noop_impl) {
continue;
}
backend = iter->backend->open_seat(listener, data);
if (backend != NULL) {
log_infof("Seat opened with backend '%s'", iter->name);
return backend;
}
log_infof("Backend '%s' failed to open seat, skipping", iter->name);
}
log_error("No backend was able to open a seat");
errno = ENOSYS;
return NULL;
}
int libseat_disable_seat(struct libseat *seat) {
assert(seat && seat->impl);
return seat->impl->disable_seat(seat);
}
int libseat_close_seat(struct libseat *seat) {
assert(seat && seat->impl);
return seat->impl->close_seat(seat);
}
const char *libseat_seat_name(struct libseat *seat) {
assert(seat && seat->impl);
return seat->impl->seat_name(seat);
}
int libseat_open_device(struct libseat *seat, const char *path, int *fd) {
assert(seat && seat->impl);
return seat->impl->open_device(seat, path, fd);
}
int libseat_close_device(struct libseat *seat, int device_id) {
assert(seat && seat->impl);
return seat->impl->close_device(seat, device_id);
}
int libseat_get_fd(struct libseat *seat) {
assert(seat && seat->impl);
return seat->impl->get_fd(seat);
}
int libseat_dispatch(struct libseat *seat, int timeout) {
assert(seat && seat->impl);
return seat->impl->dispatch(seat, timeout);
}
int libseat_switch_session(struct libseat *seat, int session) {
assert(seat && seat->impl);
return seat->impl->switch_session(seat, session);
}
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