Add FreeBSD compatibility

3 files changed, 233 insertions, 3 deletions

diff --git a/backend/session/direct-freebsd.c b/backend/session/direct-freebsd.c
new file mode 100644
index 00000000..fc4bab04
--- /dev/null
+++ b/backend/session/direct-freebsd.c
@@ -0,0 +1,217 @@
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <termios.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <dev/evdev/input.h>
+#include <sys/kbio.h>
+#include <sys/consio.h>
+#include <wayland-server.h>
+#include <wlr/backend/session/interface.h>
+#include <wlr/util/log.h>
+#include "backend/session/direct-ipc.h"
+
+const struct session_impl session_direct;
+
+struct direct_session {
+	struct wlr_session base;
+	int tty_fd;
+	int old_kbmode;
+	int sock;
+	pid_t child;
+
+	struct wl_event_source *vt_source;
+};
+
+static int direct_session_open(struct wlr_session *base, const char *path) {
+	struct direct_session *session = wl_container_of(base, session, base);
+
+	int fd = direct_ipc_open(session->sock, path);
+	if (fd < 0) {
+		wlr_log(L_ERROR, "Failed to open %s: %s%s", path, strerror(-fd),
+			fd == -EINVAL ? "; is another display server running?" : "");
+		return fd;
+	}
+
+	struct stat st;
+	if (fstat(fd, &st) < 0) {
+		close(fd);
+		return -errno;
+	}
+
+	return fd;
+}
+
+static void direct_session_close(struct wlr_session *base, int fd) {
+	struct direct_session *session = wl_container_of(base, session, base);
+
+	struct stat st;
+	if (fstat(fd, &st) < 0) {
+		wlr_log_errno(L_ERROR, "Stat failed");
+		close(fd);
+		return;
+	}
+
+	close(fd);
+}
+
+static bool direct_change_vt(struct wlr_session *base, unsigned vt) {
+	struct direct_session *session = wl_container_of(base, session, base);
+	return ioctl(session->tty_fd, VT_ACTIVATE, (int)vt) == 0;
+}
+
+static void direct_session_destroy(struct wlr_session *base) {
+	struct direct_session *session = wl_container_of(base, session, base);
+	struct vt_mode mode = {
+		.mode = VT_AUTO,
+	};
+
+	errno = 0;
+
+	ioctl(session->tty_fd, KDSKBMODE, session->old_kbmode);
+	ioctl(session->tty_fd, KDSETMODE, KD_TEXT);
+	ioctl(session->tty_fd, VT_SETMODE, &mode);
+
+	if (errno) {
+		wlr_log(L_ERROR, "Failed to restore tty");
+	}
+
+	direct_ipc_finish(session->sock, session->child);
+	close(session->sock);
+
+	wl_event_source_remove(session->vt_source);
+	close(session->tty_fd);
+	free(session);
+}
+
+static int vt_handler(int signo, void *data) {
+	struct direct_session *session = data;
+
+	if (session->base.active) {
+		session->base.active = false;
+		wl_signal_emit(&session->base.session_signal, session);
+		ioctl(session->tty_fd, VT_RELDISP, 1);
+	} else {
+		ioctl(session->tty_fd, VT_RELDISP, VT_ACKACQ);
+		session->base.active = true;
+		wl_signal_emit(&session->base.session_signal, session);
+	}
+
+	return 1;
+}
+
+static bool setup_tty(struct direct_session *session, struct wl_display *display) {
+	int fd = -1, tty = -1, tty0_fd = -1;
+	if ((tty0_fd = open("/dev/ttyv0", O_RDWR | O_CLOEXEC)) < 0) {
+		wlr_log_errno(L_ERROR, "Could not open /dev/ttyv0 to find a free vt");
+		goto error;
+	}
+	if (ioctl(tty0_fd, VT_OPENQRY, &tty) != 0) {
+		wlr_log_errno(L_ERROR, "Could not find a free vt");
+		goto error;
+	}
+	close(tty0_fd);
+	char tty_path[64];
+	snprintf(tty_path, sizeof(tty_path), "/dev/ttyv%d", tty - 1);
+	wlr_log(L_INFO, "Using tty %s", tty_path);
+	fd = open(tty_path, O_RDWR | O_NOCTTY | O_CLOEXEC);
+
+	if (fd == -1) {
+		wlr_log_errno(L_ERROR, "Cannot open tty");
+		return false;
+	}
+
+	ioctl(fd, VT_ACTIVATE, tty);
+	ioctl(fd, VT_WAITACTIVE, tty);
+
+	int old_kbmode;
+	if (ioctl(fd, KDGKBMODE, &old_kbmode)) {
+		wlr_log_errno(L_ERROR, "Failed to read tty %d keyboard mode", tty);
+		goto error;
+	}
+
+	if (ioctl(fd, KDSKBMODE, K_CODE)) {
+		wlr_log_errno(L_ERROR, "Failed to set keyboard mode K_CODE on tty %d", tty);
+		goto error;
+	}
+
+	if (ioctl(fd, KDSETMODE, KD_GRAPHICS)) {
+		wlr_log_errno(L_ERROR, "Failed to set graphics mode on tty %d", tty);
+		goto error;
+	}
+
+	struct vt_mode mode = {
+		.mode = VT_PROCESS,
+		.relsig = SIGUSR1,
+		.acqsig = SIGUSR1,
+		.frsig = SIGIO, // has to be set
+	};
+
+	if (ioctl(fd, VT_SETMODE, &mode) < 0) {
+		wlr_log(L_ERROR, "Failed to take control of tty %d", tty);
+		goto error;
+	}
+
+	struct wl_event_loop *loop = wl_display_get_event_loop(display);
+	session->vt_source = wl_event_loop_add_signal(loop, SIGUSR1,
+		vt_handler, session);
+	if (!session->vt_source) {
+		goto error;
+	}
+
+	session->base.vtnr = tty;
+	session->tty_fd = fd;
+	session->old_kbmode = old_kbmode;
+
+	return true;
+
+error:
+	// Drop back to tty 1, better than hanging in a useless blank console
+	ioctl(fd, VT_ACTIVATE, 1);
+	close(fd);
+	return false;
+}
+
+static struct wlr_session *direct_session_create(struct wl_display *disp) {
+	struct direct_session *session = calloc(1, sizeof(*session));
+	if (!session) {
+		wlr_log_errno(L_ERROR, "Allocation failed");
+		return NULL;
+	}
+
+	session->sock = direct_ipc_init(&session->child);
+	if (session->sock == -1) {
+		goto error_session;
+	}
+
+	if (!setup_tty(session, disp)) {
+		goto error_ipc;
+	}
+
+	wlr_log(L_INFO, "Successfully loaded direct session");
+
+	snprintf(session->base.seat, sizeof(session->base.seat), "seat0");
+	session->base.impl = &session_direct;
+	return &session->base;
+
+error_ipc:
+	direct_ipc_finish(session->sock, session->child);
+	close(session->sock);
+error_session:
+	free(session);
+	return NULL;
+}
+
+const struct session_impl session_direct = {
+	.create = direct_session_create,
+	.destroy = direct_session_destroy,
+	.open = direct_session_open,
+	.close = direct_session_close,
+	.change_vt = direct_change_vt,
+};
diff --git a/backend/session/direct-ipc.c b/backend/session/direct-ipc.c
index 5f1494a6..0ea51e2f 100644
--- a/backend/session/direct-ipc.c
+++ b/backend/session/direct-ipc.c
@@ -1,4 +1,8 @@
 #define _POSIX_C_SOURCE 200809L
+#ifdef __FreeBSD__
+#define __BSD_VISIBLE 1
+#define INPUT_MAJOR 0
+#endif
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -8,10 +12,12 @@
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
-#include <sys/sysmacros.h>
 #include <sys/wait.h>
-#include <xf86drm.h>
+#ifdef __linux__
+#include <sys/sysmacros.h>
 #include <linux/major.h>
+#endif
+#include <xf86drm.h>
 #include <wlr/util/log.h>
 #include "backend/session/direct-ipc.h"
 
@@ -35,11 +41,12 @@ static bool have_permissions(void) {
 }
 #else
 static bool have_permissions(void) {
+#ifdef __linux__
 	if (geteuid() != 0) {
 		wlr_log(L_ERROR, "Do not have root privileges; cannot become DRM master");
 		return false;
 	}
-
+#endif
 	return true;
 }
 #endif
diff --git a/backend/session/session.c b/backend/session/session.c
index b73952fd..b14ca4d0 100644
--- a/backend/session/session.c
+++ b/backend/session/session.c
@@ -263,6 +263,11 @@ size_t wlr_session_find_gpus(struct wlr_session *session,
 		return explicit_find_gpus(session, ret_len, ret, explicit);
 	}
 
+#ifdef __FreeBSD__
+	// XXX: libudev-devd does not return any GPUs (yet?)
+	return explicit_find_gpus(session, ret_len, ret, "/dev/drm/0");
+#else
+
 	struct udev_enumerate *en = udev_enumerate_new(session->udev);
 	if (!en) {
 		wlr_log(L_ERROR, "Failed to create udev enumeration");
@@ -329,4 +334,5 @@ size_t wlr_session_find_gpus(struct wlr_session *session,
 	udev_enumerate_unref(en);
 
 	return i;
+#endif
 }