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-rw-r--r--backend/session/direct-freebsd.c268
-rw-r--r--backend/session/direct-ipc.c269
-rw-r--r--backend/session/direct.c278
-rw-r--r--backend/session/logind.c562
-rw-r--r--backend/session/session.c359
5 files changed, 1736 insertions, 0 deletions
diff --git a/backend/session/direct-freebsd.c b/backend/session/direct-freebsd.c
new file mode 100644
index 00000000..342d0d4e
--- /dev/null
+++ b/backend/session/direct-freebsd.c
@@ -0,0 +1,268 @@
+#include <assert.h>
+#include <dev/evdev/input.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/consio.h>
+#include <sys/ioctl.h>
+#include <sys/kbio.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <termios.h>
+#include <unistd.h>
+#include <wayland-server.h>
+#include <wlr/backend/session/interface.h>
+#include <wlr/util/log.h>
+#include <xf86drm.h>
+#include "backend/session/direct-ipc.h"
+#include "util/signal.h"
+
+const struct session_impl session_direct;
+
+struct direct_session {
+ struct wlr_session base;
+ int tty_fd;
+ int old_tty;
+ int old_kbmode;
+ int sock;
+ pid_t child;
+
+ struct wl_event_source *vt_source;
+};
+
+static struct direct_session *direct_session_from_session(
+ struct wlr_session *base) {
+ assert(base->impl == &session_direct);
+ return (struct direct_session *)base;
+}
+
+static int direct_session_open(struct wlr_session *base, const char *path) {
+ struct direct_session *session = direct_session_from_session(base);
+
+ int fd = direct_ipc_open(session->sock, path);
+ if (fd < 0) {
+ wlr_log(WLR_ERROR, "Failed to open %s: %s%s", path, strerror(-fd),
+ fd == -EINVAL ? "; is another display server running?" : "");
+ return fd;
+ }
+
+ return fd;
+}
+
+static void direct_session_close(struct wlr_session *base, int fd) {
+ struct direct_session *session = direct_session_from_session(base);
+
+ int ev;
+ struct drm_version dv = {0};
+ if (ioctl(fd, DRM_IOCTL_VERSION, &dv) == 0) {
+ direct_ipc_dropmaster(session->sock, fd);
+ } else if (ioctl(fd, EVIOCGVERSION, &ev) == 0) {
+ ioctl(fd, EVIOCREVOKE, 0);
+ }
+
+ close(fd);
+}
+
+static bool direct_change_vt(struct wlr_session *base, unsigned vt) {
+ struct direct_session *session = direct_session_from_session(base);
+
+ // Only seat0 has VTs associated with it
+ if (strcmp(session->base.seat, "seat0") != 0) {
+ return true;
+ }
+
+ return ioctl(session->tty_fd, VT_ACTIVATE, (int)vt) == 0;
+}
+
+static void direct_session_destroy(struct wlr_session *base) {
+ struct direct_session *session = direct_session_from_session(base);
+
+ if (strcmp(session->base.seat, "seat0") == 0) {
+ 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);
+
+ ioctl(session->tty_fd, VT_ACTIVATE, session->old_tty);
+
+ if (errno) {
+ wlr_log(WLR_ERROR, "Failed to restore tty");
+ }
+
+ wl_event_source_remove(session->vt_source);
+ close(session->tty_fd);
+ }
+
+ direct_ipc_finish(session->sock, session->child);
+ close(session->sock);
+
+ free(session);
+}
+
+static int vt_handler(int signo, void *data) {
+ struct direct_session *session = data;
+ struct drm_version dv = {0};
+ struct wlr_device *dev;
+
+ if (session->base.active) {
+ session->base.active = false;
+ wlr_signal_emit_safe(&session->base.session_signal, session);
+
+ wl_list_for_each(dev, &session->base.devices, link) {
+ if (ioctl(dev->fd, DRM_IOCTL_VERSION, &dv) == 0) {
+ direct_ipc_dropmaster(session->sock, dev->fd);
+ }
+ }
+
+ ioctl(session->tty_fd, VT_RELDISP, 1);
+ } else {
+ ioctl(session->tty_fd, VT_RELDISP, VT_ACKACQ);
+
+ wl_list_for_each(dev, &session->base.devices, link) {
+ if (ioctl(dev->fd, DRM_IOCTL_VERSION, &dv) == 0) {
+ direct_ipc_setmaster(session->sock, dev->fd);
+ }
+ }
+
+ session->base.active = true;
+ wlr_signal_emit_safe(&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, old_tty = 1;
+ if ((tty0_fd = open("/dev/ttyv0", O_RDWR | O_CLOEXEC)) < 0) {
+ wlr_log_errno(WLR_ERROR, "Could not open /dev/ttyv0 to find a free vt");
+ goto error;
+ }
+ if (ioctl(tty0_fd, VT_GETACTIVE, &old_tty) != 0) {
+ wlr_log_errno(WLR_ERROR, "Could not get active vt");
+ goto error;
+ }
+ if (ioctl(tty0_fd, VT_OPENQRY, &tty) != 0) {
+ wlr_log_errno(WLR_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(WLR_INFO, "Using tty %s", tty_path);
+ fd = open(tty_path, O_RDWR | O_NOCTTY | O_CLOEXEC);
+
+ if (fd == -1) {
+ wlr_log_errno(WLR_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(WLR_ERROR, "Failed to read tty %d keyboard mode", tty);
+ goto error;
+ }
+
+ if (ioctl(fd, KDSKBMODE, K_CODE)) {
+ wlr_log_errno(WLR_ERROR,
+ "Failed to set keyboard mode K_CODE on tty %d", tty);
+ goto error;
+ }
+
+ if (ioctl(fd, KDSETMODE, KD_GRAPHICS)) {
+ wlr_log_errno(WLR_ERROR, "Failed to set graphics mode on tty %d", tty);
+ goto error;
+ }
+
+ struct vt_mode mode = {
+ .mode = VT_PROCESS,
+ .relsig = SIGUSR2,
+ .acqsig = SIGUSR2,
+ .frsig = SIGIO, // has to be set
+ };
+
+ if (ioctl(fd, VT_SETMODE, &mode) < 0) {
+ wlr_log(WLR_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, SIGUSR2,
+ vt_handler, session);
+ if (!session->vt_source) {
+ goto error;
+ }
+
+ session->base.vtnr = tty;
+ session->tty_fd = fd;
+ session->old_tty = old_tty;
+ session->old_kbmode = old_kbmode;
+
+ return true;
+
+error:
+ // In case we could not get the last active one, drop back to tty 1,
+ // better than hanging in a useless blank console. Otherwise activate the
+ // last active.
+ ioctl(fd, VT_ACTIVATE, old_tty);
+ 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(WLR_ERROR, "Allocation failed");
+ return NULL;
+ }
+
+ session->sock = direct_ipc_init(&session->child);
+ if (session->sock == -1) {
+ goto error_session;
+ }
+
+ const char *seat = getenv("XDG_SEAT");
+ if (!seat) {
+ seat = "seat0";
+ }
+
+ if (strcmp(seat, "seat0") == 0) {
+ if (!setup_tty(session, disp)) {
+ goto error_ipc;
+ }
+ } else {
+ session->base.vtnr = 0;
+ session->tty_fd = -1;
+ }
+
+ wlr_log(WLR_INFO, "Successfully loaded direct session");
+
+ snprintf(session->base.seat, sizeof(session->base.seat), "%s", seat);
+ 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
new file mode 100644
index 00000000..2b9634da
--- /dev/null
+++ b/backend/session/direct-ipc.c
@@ -0,0 +1,269 @@
+#define _POSIX_C_SOURCE 200809L
+#ifdef __FreeBSD__
+#define __BSD_VISIBLE 1
+#include <dev/evdev/input.h>
+#endif
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <wlr/config.h>
+#include <wlr/util/log.h>
+#include <xf86drm.h>
+#ifdef __linux__
+#include <sys/sysmacros.h>
+#include <linux/major.h>
+#endif
+#include "backend/session/direct-ipc.h"
+
+enum { DRM_MAJOR = 226 };
+
+#if WLR_HAS_LIBCAP
+#include <sys/capability.h>
+
+static bool have_permissions(void) {
+ cap_t cap = cap_get_proc();
+ cap_flag_value_t val;
+
+ if (!cap || cap_get_flag(cap, CAP_SYS_ADMIN, CAP_PERMITTED, &val) || val != CAP_SET) {
+ wlr_log(WLR_ERROR, "Do not have CAP_SYS_ADMIN; cannot become DRM master");
+ cap_free(cap);
+ return false;
+ }
+
+ cap_free(cap);
+ return true;
+}
+#else
+static bool have_permissions(void) {
+#ifdef __linux__
+ if (geteuid() != 0) {
+ wlr_log(WLR_ERROR, "Do not have root privileges; cannot become DRM master");
+ return false;
+ }
+#endif
+ return true;
+}
+#endif
+
+static void send_msg(int sock, int fd, void *buf, size_t buf_len) {
+ char control[CMSG_SPACE(sizeof(fd))] = {0};
+ struct iovec iovec = { .iov_base = buf, .iov_len = buf_len };
+ struct msghdr msghdr = {0};
+
+ if (buf) {
+ msghdr.msg_iov = &iovec;
+ msghdr.msg_iovlen = 1;
+ }
+
+ if (fd >= 0) {
+ msghdr.msg_control = &control;
+ msghdr.msg_controllen = sizeof(control);
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msghdr);
+ *cmsg = (struct cmsghdr) {
+ .cmsg_level = SOL_SOCKET,
+ .cmsg_type = SCM_RIGHTS,
+ .cmsg_len = CMSG_LEN(sizeof(fd)),
+ };
+ memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd));
+ }
+
+ ssize_t ret;
+ do {
+ ret = sendmsg(sock, &msghdr, 0);
+ } while (ret < 0 && errno == EINTR);
+}
+
+static ssize_t recv_msg(int sock, int *fd_out, void *buf, size_t buf_len) {
+ char control[CMSG_SPACE(sizeof(*fd_out))] = {0};
+ struct iovec iovec = { .iov_base = buf, .iov_len = buf_len };
+ struct msghdr msghdr = {0};
+
+ if (buf) {
+ msghdr.msg_iov = &iovec;
+ msghdr.msg_iovlen = 1;
+ }
+
+ if (fd_out) {
+ msghdr.msg_control = &control;
+ msghdr.msg_controllen = sizeof(control);
+ }
+
+ ssize_t ret;
+ do {
+ ret = recvmsg(sock, &msghdr, MSG_CMSG_CLOEXEC);
+ } while (ret < 0 && errno == EINTR);
+
+ if (fd_out) {
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msghdr);
+ if (cmsg) {
+ memcpy(fd_out, CMSG_DATA(cmsg), sizeof(*fd_out));
+ } else {
+ *fd_out = -1;
+ }
+ }
+
+ return ret;
+}
+
+enum msg_type {
+ MSG_OPEN,
+ MSG_SETMASTER,
+ MSG_DROPMASTER,
+ MSG_END,
+};
+
+struct msg {
+ enum msg_type type;
+ char path[256];
+};
+
+static void communicate(int sock) {
+ struct msg msg;
+ int drm_fd = -1;
+ bool running = true;
+
+ while (running && recv_msg(sock, &drm_fd, &msg, sizeof(msg)) > 0) {
+ switch (msg.type) {
+ case MSG_OPEN:
+ errno = 0;
+
+ // These are the same flags that logind opens files with
+ int fd = open(msg.path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
+ int ret = errno;
+ if (fd == -1) {
+ goto error;
+ }
+
+#ifndef __FreeBSD__
+ struct stat st;
+ if (fstat(fd, &st) < 0) {
+ ret = errno;
+ goto error;
+ }
+
+ uint32_t maj = major(st.st_rdev);
+ if (maj != INPUT_MAJOR && maj != DRM_MAJOR) {
+ ret = ENOTSUP;
+ goto error;
+ }
+
+ if (maj == DRM_MAJOR && drmSetMaster(fd)) {
+ ret = errno;
+ }
+#else
+ int ev;
+ struct drm_version dv = {0};
+ if (ioctl(fd, EVIOCGVERSION, &ev) == -1 &&
+ ioctl(fd, DRM_IOCTL_VERSION, &dv) == -1) {
+ ret = ENOTSUP;
+ goto error;
+ }
+
+ if (dv.version_major != 0 && drmSetMaster(fd)) {
+ ret = errno;
+ }
+#endif
+
+error:
+ send_msg(sock, ret ? -1 : fd, &ret, sizeof(ret));
+ if (fd >= 0) {
+ close(fd);
+ }
+
+ break;
+
+ case MSG_SETMASTER:
+ drmSetMaster(drm_fd);
+ close(drm_fd);
+ send_msg(sock, -1, NULL, 0);
+ break;
+
+ case MSG_DROPMASTER:
+ drmDropMaster(drm_fd);
+ close(drm_fd);
+ send_msg(sock, -1, NULL, 0);
+ break;
+
+ case MSG_END:
+ running = false;
+ send_msg(sock, -1, NULL, 0);
+ break;
+ }
+ }
+
+ close(sock);
+}
+
+int direct_ipc_open(int sock, const char *path) {
+ struct msg msg = { .type = MSG_OPEN };
+ snprintf(msg.path, sizeof(msg.path), "%s", path);
+
+ send_msg(sock, -1, &msg, sizeof(msg));
+
+ int fd, err, ret;
+ int retry = 0;
+ do {
+ ret = recv_msg(sock, &fd, &err, sizeof(err));
+ } while (ret == 0 && retry++ < 3);
+
+ return err ? -err : fd;
+}
+
+void direct_ipc_setmaster(int sock, int fd) {
+ struct msg msg = { .type = MSG_SETMASTER };
+
+ send_msg(sock, fd, &msg, sizeof(msg));
+ recv_msg(sock, NULL, NULL, 0);
+}
+
+void direct_ipc_dropmaster(int sock, int fd) {
+ struct msg msg = { .type = MSG_DROPMASTER };
+
+ send_msg(sock, fd, &msg, sizeof(msg));
+ recv_msg(sock, NULL, NULL, 0);
+}
+
+void direct_ipc_finish(int sock, pid_t pid) {
+ struct msg msg = { .type = MSG_END };
+
+ send_msg(sock, -1, &msg, sizeof(msg));
+ recv_msg(sock, NULL, NULL, 0);
+
+ waitpid(pid, NULL, 0);
+}
+
+int direct_ipc_init(pid_t *pid_out) {
+ if (!have_permissions()) {
+ return -1;
+ }
+
+ int sock[2];
+ if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, sock) < 0) {
+ wlr_log_errno(WLR_ERROR, "Failed to create socket pair");
+ return -1;
+ }
+
+ pid_t pid = fork();
+ if (pid < 0) {
+ wlr_log_errno(WLR_ERROR, "Fork failed");
+ close(sock[0]);
+ close(sock[1]);
+ return -1;
+ } else if (pid == 0) {
+ close(sock[0]);
+ communicate(sock[1]);
+ _Exit(0);
+ }
+
+ close(sock[1]);
+ *pid_out = pid;
+ return sock[0];
+}
diff --git a/backend/session/direct.c b/backend/session/direct.c
new file mode 100644
index 00000000..0912cd58
--- /dev/null
+++ b/backend/session/direct.c
@@ -0,0 +1,278 @@
+#define _POSIX_C_SOURCE 200809L
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/input.h>
+#include <linux/kd.h>
+#include <linux/major.h>
+#include <linux/vt.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#include <unistd.h>
+#include <wayland-server.h>
+#include <wlr/backend/session/interface.h>
+#include <wlr/util/log.h>
+#include "backend/session/direct-ipc.h"
+#include "util/signal.h"
+
+enum { DRM_MAJOR = 226 };
+
+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 struct direct_session *direct_session_from_session(
+ struct wlr_session *base) {
+ assert(base->impl == &session_direct);
+ return (struct direct_session *)base;
+}
+
+static int direct_session_open(struct wlr_session *base, const char *path) {
+ struct direct_session *session = direct_session_from_session(base);
+
+ int fd = direct_ipc_open(session->sock, path);
+ if (fd < 0) {
+ wlr_log(WLR_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;
+ }
+
+ if (major(st.st_rdev) == DRM_MAJOR) {
+ direct_ipc_setmaster(session->sock, fd);
+ }
+
+ return fd;
+}
+
+static void direct_session_close(struct wlr_session *base, int fd) {
+ struct direct_session *session = direct_session_from_session(base);
+
+ struct stat st;
+ if (fstat(fd, &st) < 0) {
+ wlr_log_errno(WLR_ERROR, "Stat failed");
+ close(fd);
+ return;
+ }
+
+ if (major(st.st_rdev) == DRM_MAJOR) {
+ direct_ipc_dropmaster(session->sock, fd);
+ } else if (major(st.st_rdev) == INPUT_MAJOR) {
+ ioctl(fd, EVIOCREVOKE, 0);
+ }
+
+ close(fd);
+}
+
+static bool direct_change_vt(struct wlr_session *base, unsigned vt) {
+ struct direct_session *session = direct_session_from_session(base);
+
+ // Only seat0 has VTs associated with it
+ if (strcmp(session->base.seat, "seat0") != 0) {
+ return true;
+ }
+
+ return ioctl(session->tty_fd, VT_ACTIVATE, (int)vt) == 0;
+}
+
+static void direct_session_destroy(struct wlr_session *base) {
+ struct direct_session *session = direct_session_from_session(base);
+
+ if (strcmp(session->base.seat, "seat0") == 0) {
+ 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(WLR_ERROR, "Failed to restore tty");
+ }
+
+ wl_event_source_remove(session->vt_source);
+ close(session->tty_fd);
+ }
+
+ direct_ipc_finish(session->sock, session->child);
+ close(session->sock);
+
+ free(session);
+}
+
+static int vt_handler(int signo, void *data) {
+ struct direct_session *session = data;
+
+ if (session->base.active) {
+ session->base.active = false;
+ wlr_signal_emit_safe(&session->base.session_signal, session);
+
+ struct wlr_device *dev;
+ wl_list_for_each(dev, &session->base.devices, link) {
+ if (major(dev->dev) == DRM_MAJOR) {
+ direct_ipc_dropmaster(session->sock,
+ dev->fd);
+ }
+ }
+
+ ioctl(session->tty_fd, VT_RELDISP, 1);
+ } else {
+ ioctl(session->tty_fd, VT_RELDISP, VT_ACKACQ);
+
+ struct wlr_device *dev;
+ wl_list_for_each(dev, &session->base.devices, link) {
+ if (major(dev->dev) == DRM_MAJOR) {
+ direct_ipc_setmaster(session->sock,
+ dev->fd);
+ }
+ }
+
+ session->base.active = true;
+ wlr_signal_emit_safe(&session->base.session_signal, session);
+ }
+
+ return 1;
+}
+
+static bool setup_tty(struct direct_session *session, struct wl_display *display) {
+ int fd = open("/dev/tty", O_RDWR);
+ if (fd == -1) {
+ wlr_log_errno(WLR_ERROR, "Cannot open /dev/tty");
+ return false;
+ }
+
+ struct vt_stat vt_stat;
+ if (ioctl(fd, VT_GETSTATE, &vt_stat)) {
+ wlr_log_errno(WLR_ERROR, "Could not get current tty number");
+ goto error;
+ }
+
+ int tty = vt_stat.v_active;
+ int ret, kd_mode, old_kbmode;
+
+ ret = ioctl(fd, KDGETMODE, &kd_mode);
+ if (ret) {
+ wlr_log_errno(WLR_ERROR, "Failed to get tty mode");
+ goto error;
+ }
+
+ if (kd_mode != KD_TEXT) {
+ wlr_log(WLR_ERROR,
+ "tty already in graphics mode; is another display server running?");
+ goto error;
+ }
+
+ ioctl(fd, VT_ACTIVATE, tty);
+ ioctl(fd, VT_WAITACTIVE, tty);
+
+ if (ioctl(fd, KDGKBMODE, &old_kbmode)) {
+ wlr_log_errno(WLR_ERROR, "Failed to read keyboard mode");
+ goto error;
+ }
+
+ if (ioctl(fd, KDSKBMODE, K_OFF)) {
+ wlr_log_errno(WLR_ERROR, "Failed to set keyboard mode");
+ goto error;
+ }
+
+ if (ioctl(fd, KDSETMODE, KD_GRAPHICS)) {
+ wlr_log_errno(WLR_ERROR, "Failed to set graphics mode on tty");
+ goto error;
+ }
+
+ struct vt_mode mode = {
+ .mode = VT_PROCESS,
+ .relsig = SIGUSR2,
+ .acqsig = SIGUSR2,
+ };
+
+ if (ioctl(fd, VT_SETMODE, &mode) < 0) {
+ wlr_log(WLR_ERROR, "Failed to take control of tty");
+ goto error;
+ }
+
+ struct wl_event_loop *loop = wl_display_get_event_loop(display);
+ session->vt_source = wl_event_loop_add_signal(loop, SIGUSR2,
+ 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:
+ 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(WLR_ERROR, "Allocation failed");
+ return NULL;
+ }
+
+ session->sock = direct_ipc_init(&session->child);
+ if (session->sock == -1) {
+ goto error_session;
+ }
+
+ const char *seat = getenv("XDG_SEAT");
+ if (!seat) {
+ seat = "seat0";
+ }
+
+ if (strcmp(seat, "seat0") == 0) {
+ if (!setup_tty(session, disp)) {
+ goto error_ipc;
+ }
+ } else {
+ session->base.vtnr = 0;
+ session->tty_fd = -1;
+ }
+
+ snprintf(session->base.seat, sizeof(session->base.seat), "%s", seat);
+ session->base.impl = &session_direct;
+
+ wlr_log(WLR_INFO, "Successfully loaded direct session");
+ 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/logind.c b/backend/session/logind.c
new file mode 100644
index 00000000..9a1383ce
--- /dev/null
+++ b/backend/session/logind.c
@@ -0,0 +1,562 @@
+#define _POSIX_C_SOURCE 200809L
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#include <unistd.h>
+#include <wayland-server.h>
+#include <wlr/backend/session/interface.h>
+#include <wlr/config.h>
+#include <wlr/util/log.h>
+#include "util/signal.h"
+
+#if WLR_HAS_SYSTEMD
+ #include <systemd/sd-bus.h>
+ #include <systemd/sd-login.h>
+#elif WLR_HAS_ELOGIND
+ #include <elogind/sd-bus.h>
+ #include <elogind/sd-login.h>
+#endif
+
+enum { DRM_MAJOR = 226 };
+
+const struct session_impl session_logind;
+
+struct logind_session {
+ struct wlr_session base;
+
+ sd_bus *bus;
+ struct wl_event_source *event;
+
+ char *id;
+ char *path;
+
+ // specifies whether a drm device was taken
+ // if so, the session will be (de)activated with the drm fd,
+ // otherwise with the dbus PropertiesChanged on "active" signal
+ bool has_drm;
+};
+
+static struct logind_session *logind_session_from_session(
+ struct wlr_session *base) {
+ assert(base->impl == &session_logind);
+ return (struct logind_session *)base;
+}
+
+static int logind_take_device(struct wlr_session *base, const char *path) {
+ struct logind_session *session = logind_session_from_session(base);
+
+ int fd = -1;
+ int ret;
+ sd_bus_message *msg = NULL;
+ sd_bus_error error = SD_BUS_ERROR_NULL;
+
+ struct stat st;
+ if (stat(path, &st) < 0) {
+ wlr_log(WLR_ERROR, "Failed to stat '%s'", path);
+ return -1;
+ }
+
+ if (major(st.st_rdev) == DRM_MAJOR) {
+ session->has_drm = true;
+ }
+
+ ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
+ session->path, "org.freedesktop.login1.Session", "TakeDevice",
+ &error, &msg, "uu", major(st.st_rdev), minor(st.st_rdev));
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to take device '%s': %s", path,
+ error.message);
+ goto out;
+ }
+
+ int paused = 0;
+ ret = sd_bus_message_read(msg, "hb", &fd, &paused);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to parse D-Bus response for '%s': %s",
+ path, strerror(-ret));
+ goto out;
+ }
+
+ // The original fd seems to be closed when the message is freed
+ // so we just clone it.
+ fd = fcntl(fd, F_DUPFD_CLOEXEC, 0);
+ if (fd < 0) {
+ wlr_log(WLR_ERROR, "Failed to clone file descriptor for '%s': %s",
+ path, strerror(errno));
+ goto out;
+ }
+
+out:
+ sd_bus_error_free(&error);
+ sd_bus_message_unref(msg);
+ return fd;
+}
+
+static void logind_release_device(struct wlr_session *base, int fd) {
+ struct logind_session *session = logind_session_from_session(base);
+
+ struct stat st;
+ if (fstat(fd, &st) < 0) {
+ wlr_log(WLR_ERROR, "Failed to stat device '%d': %s", fd,
+ strerror(errno));
+ return;
+ }
+
+ sd_bus_message *msg = NULL;
+ sd_bus_error error = SD_BUS_ERROR_NULL;
+ int ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
+ session->path, "org.freedesktop.login1.Session", "ReleaseDevice",
+ &error, &msg, "uu", major(st.st_rdev), minor(st.st_rdev));
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to release device '%d': %s", fd,
+ error.message);
+ }
+
+ sd_bus_error_free(&error);
+ sd_bus_message_unref(msg);
+ close(fd);
+}
+
+static bool logind_change_vt(struct wlr_session *base, unsigned vt) {
+ struct logind_session *session = logind_session_from_session(base);
+
+ // Only seat0 has VTs associated with it
+ if (strcmp(session->base.seat, "seat0") != 0) {
+ return true;
+ }
+
+ int ret;
+ sd_bus_message *msg = NULL;
+ sd_bus_error error = SD_BUS_ERROR_NULL;
+
+ ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
+ "/org/freedesktop/login1/seat/self", "org.freedesktop.login1.Seat", "SwitchTo",
+ &error, &msg, "u", (uint32_t)vt);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to change to vt '%d'", vt);
+ }
+
+ sd_bus_error_free(&error);
+ sd_bus_message_unref(msg);
+ return ret >= 0;
+}
+
+static bool find_session_path(struct logind_session *session) {
+ int ret;
+ sd_bus_message *msg = NULL;
+ sd_bus_error error = SD_BUS_ERROR_NULL;
+
+ ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
+ "/org/freedesktop/login1", "org.freedesktop.login1.Manager",
+ "GetSession", &error, &msg, "s", session->id);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to get session path: %s", error.message);
+ goto out;
+ }
+
+ const char *path;
+ ret = sd_bus_message_read(msg, "o", &path);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Could not parse session path: %s", error.message);
+ goto out;
+ }
+ session->path = strdup(path);
+
+out:
+ sd_bus_error_free(&error);
+ sd_bus_message_unref(msg);
+
+ return ret >= 0;
+}
+
+static bool session_activate(struct logind_session *session) {
+ int ret;
+ sd_bus_message *msg = NULL;
+ sd_bus_error error = SD_BUS_ERROR_NULL;
+
+ ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
+ session->path, "org.freedesktop.login1.Session", "Activate",
+ &error, &msg, "");
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to activate session: %s", error.message);
+ }
+
+ sd_bus_error_free(&error);
+ sd_bus_message_unref(msg);
+ return ret >= 0;
+}
+
+static bool take_control(struct logind_session *session) {
+ int ret;
+ sd_bus_message *msg = NULL;
+ sd_bus_error error = SD_BUS_ERROR_NULL;
+
+ ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
+ session->path, "org.freedesktop.login1.Session", "TakeControl",
+ &error, &msg, "b", false);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to take control of session: %s",
+ error.message);
+ }
+
+ sd_bus_error_free(&error);
+ sd_bus_message_unref(msg);
+ return ret >= 0;
+}
+
+static void release_control(struct logind_session *session) {
+ int ret;
+ sd_bus_message *msg = NULL;
+ sd_bus_error error = SD_BUS_ERROR_NULL;
+
+ ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
+ session->path, "org.freedesktop.login1.Session", "ReleaseControl",
+ &error, &msg, "");
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to release control of session: %s",
+ error.message);
+ }
+
+ sd_bus_error_free(&error);
+ sd_bus_message_unref(msg);
+}
+
+static void logind_session_destroy(struct wlr_session *base) {
+ struct logind_session *session = logind_session_from_session(base);
+
+ release_control(session);
+
+ wl_event_source_remove(session->event);
+ sd_bus_unref(session->bus);
+ free(session->id);
+ free(session->path);
+ free(session);
+}
+
+static int session_removed(sd_bus_message *msg, void *userdata,
+ sd_bus_error *ret_error) {
+ wlr_log(WLR_INFO, "SessionRemoved signal received");
+ return 0;
+}
+
+static struct wlr_device *find_device(struct wlr_session *session,
+ dev_t devnum) {
+ struct wlr_device *dev;
+
+ wl_list_for_each(dev, &session->devices, link) {
+ if (dev->dev == devnum) {
+ return dev;
+ }
+ }
+
+ wlr_log(WLR_ERROR, "Tried to use dev_t %lu not opened by session",
+ (unsigned long)devnum);
+ assert(0);
+}
+
+static int pause_device(sd_bus_message *msg, void *userdata,
+ sd_bus_error *ret_error) {
+ struct logind_session *session = userdata;
+ int ret;
+
+ uint32_t major, minor;
+ const char *type;
+ ret = sd_bus_message_read(msg, "uus", &major, &minor, &type);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to parse D-Bus response for PauseDevice: %s",
+ strerror(-ret));
+ goto error;
+ }
+
+ if (major == DRM_MAJOR) {
+ assert(session->has_drm);
+ session->base.active = false;
+ wlr_signal_emit_safe(&session->base.session_signal, session);
+ }
+
+ if (strcmp(type, "pause") == 0) {
+ ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
+ session->path, "org.freedesktop.login1.Session", "PauseDeviceComplete",
+ ret_error, &msg, "uu", major, minor);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to send PauseDeviceComplete signal: %s",
+ strerror(-ret));
+ }
+ }
+
+error:
+ return 0;
+}
+
+static int resume_device(sd_bus_message *msg, void *userdata, sd_bus_error *ret_error) {
+ struct logind_session *session = userdata;
+ int ret;
+
+ int fd;
+ uint32_t major, minor;
+ ret = sd_bus_message_read(msg, "uuh", &major, &minor, &fd);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to parse D-Bus response for ResumeDevice: %s",
+ strerror(-ret));
+ goto error;
+ }
+
+ if (major == DRM_MAJOR) {
+ struct wlr_device *dev = find_device(&session->base, makedev(major, minor));
+ dup2(fd, dev->fd);
+
+ if (!session->base.active) {
+ session->base.active = true;
+ wlr_signal_emit_safe(&session->base.session_signal, session);
+ }
+ }
+
+error:
+ return 0;
+}
+
+static int properties_changed(sd_bus_message *msg, void *userdata,
+ sd_bus_error *ret_error) {
+ struct logind_session *session = userdata;
+ int ret = 0;
+
+ // if we have a drm fd we don't depend on this
+ if (session->has_drm) {
+ return 0;
+ }
+
+ // PropertiesChanged arg 1: interface
+ const char *interface;
+ ret = sd_bus_message_read_basic(msg, 's', &interface); // skip path
+ if (ret < 0) {
+ goto error;
+ }
+
+ if (strcmp(interface, "org.freedesktop.login1.Session") != 0) {
+ // not interesting for us; ignore
+ wlr_log(WLR_DEBUG, "ignoring PropertiesChanged from %s", interface);
+ return 0;
+ }
+
+ // PropertiesChanged arg 2: changed properties with values
+ ret = sd_bus_message_enter_container(msg, 'a', "{sv}");
+ if (ret < 0) {
+ goto error;
+ }
+
+ const char *s;
+ while ((ret = sd_bus_message_enter_container(msg, 'e', "sv")) > 0) {
+ ret = sd_bus_message_read_basic(msg, 's', &s);
+ if (ret < 0) {
+ goto error;
+ }
+
+ if (strcmp(s, "Active") == 0) {
+ int ret;
+ ret = sd_bus_message_enter_container(msg, 'v', "b");
+ if (ret < 0) {
+ goto error;
+ }
+
+ bool active;
+ ret = sd_bus_message_read_basic(msg, 'b', &active);
+ if (ret < 0) {
+ goto error;
+ }
+
+ if (session->base.active != active) {
+ session->base.active = active;
+ wlr_signal_emit_safe(&session->base.session_signal, session);
+ }
+ return 0;
+ } else {
+ sd_bus_message_skip(msg, "{sv}");
+ }
+
+ ret = sd_bus_message_exit_container(msg);
+ if (ret < 0) {
+ goto error;
+ }
+ }
+
+ if (ret < 0) {
+ goto error;
+ }
+
+ ret = sd_bus_message_exit_container(msg);
+ if (ret < 0) {
+ goto error;
+ }
+
+ // PropertiesChanged arg 3: changed properties without values
+ sd_bus_message_enter_container(msg, 'a', "s");
+ while ((ret = sd_bus_message_read_basic(msg, 's', &s)) > 0) {
+ if (strcmp(s, "Active") == 0) {
+ sd_bus_error error = SD_BUS_ERROR_NULL;
+ bool active;
+ ret = sd_bus_get_property_trivial(session->bus,
+ "org.freedesktop.login1", session->path,
+ "org.freedesktop.login1.Session", "Active", &error,
+ 'b', &active);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to get 'Active' property: %s",
+ error.message);
+ return 0;
+ }
+
+ if (session->base.active != active) {
+ session->base.active = active;
+ wlr_signal_emit_safe(&session->base.session_signal, session);
+ }
+ return 0;
+ }
+ }
+
+ if (ret < 0) {
+ goto error;
+ }
+
+ return 0;
+
+error:
+ wlr_log(WLR_ERROR, "Failed to parse D-Bus PropertiesChanged: %s",
+ strerror(-ret));
+ return 0;
+}
+
+static bool add_signal_matches(struct logind_session *session) {
+ int ret;
+
+ char str[256];
+ const char *fmt = "type='signal',"
+ "sender='org.freedesktop.login1',"
+ "interface='org.freedesktop.login1.%s',"
+ "member='%s',"
+ "path='%s'";
+
+ snprintf(str, sizeof(str), fmt, "Manager", "SessionRemoved",
+ "/org/freedesktop/login1");
+ ret = sd_bus_add_match(session->bus, NULL, str, session_removed, session);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
+ return false;
+ }
+
+ snprintf(str, sizeof(str), fmt, "Session", "PauseDevice", session->path);
+ ret = sd_bus_add_match(session->bus, NULL, str, pause_device, session);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
+ return false;
+ }
+
+ snprintf(str, sizeof(str), fmt, "Session", "ResumeDevice", session->path);
+ ret = sd_bus_add_match(session->bus, NULL, str, resume_device, session);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
+ return false;
+ }
+
+ ret = sd_bus_match_signal(session->bus, NULL, "org.freedesktop.login1",
+ session->path, "org.freedesktop.DBus.Properties", "PropertiesChanged",
+ properties_changed, session);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
+ return false;
+ }
+
+ return true;
+}
+
+static int dbus_event(int fd, uint32_t mask, void *data) {
+ sd_bus *bus = data;
+ while (sd_bus_process(bus, NULL) > 0) {
+ // Do nothing.
+ }
+ return 1;
+}
+
+static struct wlr_session *logind_session_create(struct wl_display *disp) {
+ int ret;
+ struct logind_session *session = calloc(1, sizeof(*session));
+ if (!session) {
+ wlr_log(WLR_ERROR, "Allocation failed: %s", strerror(errno));
+ return NULL;
+ }
+
+ ret = sd_pid_get_session(getpid(), &session->id);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to get session id: %s", strerror(-ret));
+ goto error;
+ }
+
+ char *seat;
+ ret = sd_session_get_seat(session->id, &seat);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to get seat id: %s", strerror(-ret));
+ goto error;
+ }
+ snprintf(session->base.seat, sizeof(session->base.seat), "%s", seat);
+
+ if (strcmp(seat, "seat0") == 0) {
+ ret = sd_session_get_vt(session->id, &session->base.vtnr);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Session not running in virtual terminal");
+ goto error;
+ }
+ }
+ free(seat);
+
+ ret = sd_bus_default_system(&session->bus);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Failed to open D-Bus connection: %s", strerror(-ret));
+ goto error;
+ }
+
+ if (!find_session_path(session)) {
+ sd_bus_unref(session->bus);
+ goto error;
+ }
+
+ if (!add_signal_matches(session)) {
+ goto error_bus;
+ }
+
+ struct wl_event_loop *event_loop = wl_display_get_event_loop(disp);
+ session->event = wl_event_loop_add_fd(event_loop, sd_bus_get_fd(session->bus),
+ WL_EVENT_READABLE, dbus_event, session->bus);
+
+ if (!session_activate(session)) {
+ goto error_bus;
+ }
+
+ if (!take_control(session)) {
+ goto error_bus;
+ }
+
+ wlr_log(WLR_INFO, "Successfully loaded logind session");
+
+ session->base.impl = &session_logind;
+ return &session->base;
+
+error_bus:
+ sd_bus_unref(session->bus);
+ free(session->path);
+
+error:
+ free(session->id);
+ return NULL;
+}
+
+const struct session_impl session_logind = {
+ .create = logind_session_create,
+ .destroy = logind_session_destroy,
+ .open = logind_take_device,
+ .close = logind_release_device,
+ .change_vt = logind_change_vt,
+};
diff --git a/backend/session/session.c b/backend/session/session.c
new file mode 100644
index 00000000..96cde65c
--- /dev/null
+++ b/backend/session/session.c
@@ -0,0 +1,359 @@
+#define _POSIX_C_SOURCE 200809L
+#include <assert.h>
+#include <libudev.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <wayland-server.h>
+#include <wlr/backend/session.h>
+#include <wlr/backend/session/interface.h>
+#include <wlr/config.h>
+#include <wlr/util/log.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+#include "util/signal.h"
+
+extern const struct session_impl session_logind;
+extern const struct session_impl session_direct;
+
+static const struct session_impl *impls[] = {
+#if WLR_HAS_SYSTEMD || WLR_HAS_ELOGIND
+ &session_logind,
+#endif
+ &session_direct,
+ NULL,
+};
+
+static int udev_event(int fd, uint32_t mask, void *data) {
+ struct wlr_session *session = data;
+
+ struct udev_device *udev_dev = udev_monitor_receive_device(session->mon);
+ if (!udev_dev) {
+ return 1;
+ }
+
+ const char *action = udev_device_get_action(udev_dev);
+
+ wlr_log(WLR_DEBUG, "udev event for %s (%s)",
+ udev_device_get_sysname(udev_dev), action);
+
+ if (!action || strcmp(action, "change") != 0) {
+ goto out;
+ }
+
+ dev_t devnum = udev_device_get_devnum(udev_dev);
+ struct wlr_device *dev;
+
+ wl_list_for_each(dev, &session->devices, link) {
+ if (dev->dev == devnum) {
+ wlr_signal_emit_safe(&dev->signal, session);
+ break;
+ }
+ }
+
+out:
+ udev_device_unref(udev_dev);
+ return 1;
+}
+
+static void handle_display_destroy(struct wl_listener *listener, void *data) {
+ struct wlr_session *session =
+ wl_container_of(listener, session, display_destroy);
+ wlr_session_destroy(session);
+}
+
+struct wlr_session *wlr_session_create(struct wl_display *disp) {
+ struct wlr_session *session = NULL;
+
+ const char *env_wlr_session = getenv("WLR_SESSION");
+ if (env_wlr_session) {
+ if (!strcmp(env_wlr_session, "logind") || !strcmp(env_wlr_session, "systemd")) {
+ #if WLR_HAS_SYSTEMD || WLR_HAS_ELOGIND
+ session = session_logind.create(disp);
+ #else
+ wlr_log(WLR_ERROR, "wlroots is not compiled with logind support");
+ #endif
+ } else if (!strcmp(env_wlr_session, "direct")) {
+ session = session_direct.create(disp);
+ } else {
+ wlr_log(WLR_ERROR, "WLR_SESSION has an invalid value: %s", env_wlr_session);
+ }
+ } else {
+ const struct session_impl **iter;
+ for (iter = impls; !session && *iter; ++iter) {
+ session = (*iter)->create(disp);
+ }
+ }
+
+ if (!session) {
+ wlr_log(WLR_ERROR, "Failed to load session backend");
+ return NULL;
+ }
+
+ session->active = true;
+ wl_signal_init(&session->session_signal);
+ wl_signal_init(&session->events.destroy);
+ wl_list_init(&session->devices);
+
+ session->udev = udev_new();
+ if (!session->udev) {
+ wlr_log_errno(WLR_ERROR, "Failed to create udev context");
+ goto error_session;
+ }
+
+ session->mon = udev_monitor_new_from_netlink(session->udev, "udev");
+ if (!session->mon) {
+ wlr_log_errno(WLR_ERROR, "Failed to create udev monitor");
+ goto error_udev;
+ }
+
+ udev_monitor_filter_add_match_subsystem_devtype(session->mon, "drm", NULL);
+ udev_monitor_enable_receiving(session->mon);
+
+ struct wl_event_loop *event_loop = wl_display_get_event_loop(disp);
+ int fd = udev_monitor_get_fd(session->mon);
+
+ session->udev_event = wl_event_loop_add_fd(event_loop, fd,
+ WL_EVENT_READABLE, udev_event, session);
+ if (!session->udev_event) {
+ wlr_log_errno(WLR_ERROR, "Failed to create udev event source");
+ goto error_mon;
+ }
+
+ session->display_destroy.notify = handle_display_destroy;
+ wl_display_add_destroy_listener(disp, &session->display_destroy);
+
+ return session;
+
+error_mon:
+ udev_monitor_unref(session->mon);
+error_udev:
+ udev_unref(session->udev);
+error_session:
+ session->impl->destroy(session);
+ return NULL;
+}
+
+void wlr_session_destroy(struct wlr_session *session) {
+ if (!session) {
+ return;
+ }
+
+ wlr_signal_emit_safe(&session->events.destroy, session);
+ wl_list_remove(&session->display_destroy.link);
+
+ wl_event_source_remove(session->udev_event);
+ udev_monitor_unref(session->mon);
+ udev_unref(session->udev);
+
+ session->impl->destroy(session);
+}
+
+int wlr_session_open_file(struct wlr_session *session, const char *path) {
+ int fd = session->impl->open(session, path);
+ if (fd < 0) {
+ return fd;
+ }
+
+ struct wlr_device *dev = malloc(sizeof(*dev));
+ if (!dev) {
+ wlr_log_errno(WLR_ERROR, "Allocation failed");
+ goto error;
+ }
+
+ struct stat st;
+ if (fstat(fd, &st) < 0) {
+ wlr_log_errno(WLR_ERROR, "Stat failed");
+ goto error;
+ }
+
+ dev->fd = fd;
+ dev->dev = st.st_rdev;
+ wl_signal_init(&dev->signal);
+ wl_list_insert(&session->devices, &dev->link);
+
+ return fd;
+
+error:
+ free(dev);
+ return fd;
+}
+
+static struct wlr_device *find_device(struct wlr_session *session, int fd) {
+ struct wlr_device *dev;
+
+ wl_list_for_each(dev, &session->devices, link) {
+ if (dev->fd == fd) {
+ return dev;
+ }
+ }
+
+ wlr_log(WLR_ERROR, "Tried to use fd %d not opened by session", fd);
+ assert(0);
+}
+
+void wlr_session_close_file(struct wlr_session *session, int fd) {
+ struct wlr_device *dev = find_device(session, fd);
+
+ session->impl->close(session, fd);
+ wl_list_remove(&dev->link);
+ free(dev);
+}
+
+void wlr_session_signal_add(struct wlr_session *session, int fd,
+ struct wl_listener *listener) {
+ struct wlr_device *dev = find_device(session, fd);
+
+ wl_signal_add(&dev->signal, listener);
+}
+
+bool wlr_session_change_vt(struct wlr_session *session, unsigned vt) {
+ if (!session) {
+ return false;
+ }
+
+ return session->impl->change_vt(session, vt);
+}
+
+/* Tests if 'path' is KMS compatible by trying to open it.
+ * It leaves the open device in *fd_out it it succeeds.
+ */
+static int open_if_kms(struct wlr_session *restrict session, const char *restrict path) {
+ int fd;
+
+ if (!path) {
+ return -1;
+ }
+
+ fd = wlr_session_open_file(session, path);
+ if (fd < 0) {
+ return -1;
+ }
+
+ drmModeRes *res = drmModeGetResources(fd);
+ if (!res) {
+ goto out_fd;
+ }
+
+ drmModeFreeResources(res);
+ return fd;
+
+out_fd:
+ wlr_session_close_file(session, fd);
+ return -1;
+}
+
+static size_t explicit_find_gpus(struct wlr_session *session,
+ size_t ret_len, int ret[static ret_len], const char *str) {
+ char *gpus = strdup(str);
+ if (!gpus) {
+ wlr_log_errno(WLR_ERROR, "Allocation failed");
+ return 0;
+ }
+
+ size_t i = 0;
+ char *save;
+ char *ptr = strtok_r(gpus, ":", &save);
+ do {
+ if (i >= ret_len) {
+ break;
+ }
+
+ ret[i] = open_if_kms(session, ptr);
+ if (ret[i] < 0) {
+ wlr_log(WLR_ERROR, "Unable to open %s as DRM device", ptr);
+ } else {
+ ++i;
+ }
+ } while ((ptr = strtok_r(NULL, ":", &save)));
+
+ free(gpus);
+ return i;
+}
+
+/* Tries to find the primary GPU by checking for the "boot_vga" attribute.
+ * If it's not found, it returns the first valid GPU it finds.
+ */
+size_t wlr_session_find_gpus(struct wlr_session *session,
+ size_t ret_len, int *ret) {
+ const char *explicit = getenv("WLR_DRM_DEVICES");
+ if (explicit) {
+ 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(WLR_ERROR, "Failed to create udev enumeration");
+ return -1;
+ }
+
+ udev_enumerate_add_match_subsystem(en, "drm");
+ udev_enumerate_add_match_sysname(en, "card[0-9]*");
+ udev_enumerate_scan_devices(en);
+
+ struct udev_list_entry *entry;
+ size_t i = 0;
+
+ udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(en)) {
+ if (i == ret_len) {
+ break;
+ }
+
+ bool is_boot_vga = false;
+
+ const char *path = udev_list_entry_get_name(entry);
+ struct udev_device *dev = udev_device_new_from_syspath(session->udev, path);
+ if (!dev) {
+ continue;
+ }
+
+ const char *seat = udev_device_get_property_value(dev, "ID_SEAT");
+ if (!seat) {
+ seat = "seat0";
+ }
+ if (session->seat[0] && strcmp(session->seat, seat) != 0) {
+ udev_device_unref(dev);
+ continue;
+ }
+
+ // This is owned by 'dev', so we don't need to free it
+ struct udev_device *pci =
+ udev_device_get_parent_with_subsystem_devtype(dev, "pci", NULL);
+
+ if (pci) {
+ const char *id = udev_device_get_sysattr_value(pci, "boot_vga");
+ if (id && strcmp(id, "1") == 0) {
+ is_boot_vga = true;
+ }
+ }
+
+ int fd = open_if_kms(session, udev_device_get_devnode(dev));
+ if (fd < 0) {
+ udev_device_unref(dev);
+ continue;
+ }
+
+ udev_device_unref(dev);
+
+ ret[i] = fd;
+ if (is_boot_vga) {
+ int tmp = ret[0];
+ ret[0] = ret[i];
+ ret[i] = tmp;
+ }
+
+ ++i;
+ }
+
+ udev_enumerate_unref(en);
+
+ return i;
+#endif
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-11-04 15:51:19 +0000