New session interface.

This commit is contained in:
Scott Anderson 2017-05-03 14:11:22 +12:00
parent e446a5300b
commit 762ac7f4c0
6 changed files with 316 additions and 2 deletions

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@ -51,8 +51,7 @@ find_package(DRM REQUIRED)
find_package(GBM REQUIRED)
find_package(LibInput REQUIRED)
find_package(Udev REQUIRED)
find_package(Dbus)
find_package(Systemd REQUIRED)
find_package(Systemd)
include(Wayland)
include(Manpage)
@ -62,5 +61,6 @@ include_directories(include)
add_subdirectory(backend)
add_subdirectory(common)
add_subdirectory(wayland)
add_subdirectory(session)
add_subdirectory(example)

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@ -0,0 +1,20 @@
#ifndef WLR_SESSION_INTERFACE_H
#define WLR_SESSION_INTERFACE_H
struct wlr_session;
struct session_interface {
struct wlr_session *(*start)(void);
void (*finish)(struct wlr_session *session);
int (*open)(struct wlr_session *restrict session,
const char *restrict path);
void (*close)(struct wlr_session *session, int fd);
};
struct wlr_session {
struct session_interface iface;
};
extern const struct session_interface session_logind_iface;
#endif

12
include/wlr/session.h Normal file
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@ -0,0 +1,12 @@
#ifndef WLR_SESSION_H
#define WLR_SESSION_H
struct wlr_session;
struct wlr_session *wlr_session_start(void);
void wlr_session_finish(struct wlr_session *session);
int wlr_session_open_file(struct wlr_session *restrict session,
const char *restrict path);
void wlr_session_close_file(struct wlr_session *session, int fd);
#endif

24
session/CMakeLists.txt Normal file
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@ -0,0 +1,24 @@
include_directories(
${WAYLAND_INCLUDE_DIR}
)
set(sources
session.c
)
set(libs
wlr-common
${WAYLAND_LIBRARIES}
)
if (SYSTEMD_FOUND)
add_definitions(${SYSTEMD_DEFINITIONS})
include_directories(${SYSTEMD_INCLUDE_DIRS})
add_definitions(-DHAS_SYSTEMD)
list(APPEND sources logind.c)
list(APPEND libs ${SYSTEMD_LIBRARIES})
endif ()
add_library(wlr-session ${sources})
target_link_libraries(wlr-session ${libs})

220
session/logind.c Normal file
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@ -0,0 +1,220 @@
#define _POSIX_C_SOURCE 200809L
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <systemd/sd-bus.h>
#include <systemd/sd-login.h>
#include <unistd.h>
#include <sys/sysmacros.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <wayland-server.h>
#include "session/interface.h"
#include "common/log.h"
struct logind_session {
struct wlr_session base;
sd_bus *bus;
char *id;
char *path;
char *seat;
};
static int logind_take_device(struct wlr_session *restrict base,
const char *restrict path) {
struct logind_session *session = wl_container_of(base, session, base);
int ret;
int fd = -1;
sd_bus_message *msg = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
struct stat st;
if (stat(path, &st) < 0) {
wlr_log(L_ERROR, "Failed to stat '%s'", path);
return -1;
}
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(L_ERROR, "Failed to take device '%s': %s", path, error.message);
goto error;
}
int paused = 0;
ret = sd_bus_message_read(msg, "hb", &fd, &paused);
if (ret < 0) {
wlr_log(L_ERROR, "Failed to parse DBus response for '%s': %s",
path, strerror(-ret));
goto error;
}
// The original fd seem to be closed when the message is freed
// so we just clone it.
fd = fcntl(fd, F_DUPFD_CLOEXEC, 0);
if (fd == -1) {
wlr_log(L_ERROR, "Failed to clone file descriptor for '%s': %s",
path, strerror(errno));
goto error;
}
error:
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 = wl_container_of(base, session, base);
int ret;
sd_bus_message *msg = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
struct stat st;
if (fstat(fd, &st) < 0) {
wlr_log(L_ERROR, "Failed to stat device '%d'", fd);
return;
}
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(L_ERROR, "Failed to release device '%d'", fd);
}
sd_bus_error_free(&error);
sd_bus_message_unref(msg);
}
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(L_ERROR, "Failed to activate session");
}
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(L_ERROR, "Failed to take control of session");
}
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(L_ERROR, "Failed to release control of session");
}
sd_bus_error_free(&error);
sd_bus_message_unref(msg);
}
static void logind_session_finish(struct wlr_session *base) {
struct logind_session *session = wl_container_of(base, session, base);
release_control(session);
sd_bus_unref(session->bus);
free(session->id);
free(session->path);
free(session->seat);
free(session);
}
static struct wlr_session *logind_session_start(void) {
int ret;
struct logind_session *session = calloc(1, sizeof(*session));
if (!session) {
wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
return NULL;
}
ret = sd_pid_get_session(getpid(), &session->id);
if (ret < 0) {
wlr_log(L_ERROR, "Failed to get session id: %s", strerror(-ret));
goto error;
}
ret = sd_session_get_seat(session->id, &session->seat);
if (ret < 0) {
wlr_log(L_ERROR, "Failed to get seat id: %s", strerror(-ret));
goto error;
}
const char *fmt = "/org/freedesktop/login1/session/%s";
int len = snprintf(NULL, 0, fmt, session->id);
session->path = malloc(len + 1);
if (!session->path)
goto error;
sprintf(session->path, fmt, session->id);
ret = sd_bus_default_system(&session->bus);
if (ret < 0) {
wlr_log(L_ERROR, "Failed to open DBus connection: %s", strerror(-ret));
goto error;
}
if (!session_activate(session))
goto error_bus;
if (!take_control(session))
goto error_bus;
return &session->base;
error_bus:
sd_bus_unref(session->bus);
error:
free(session->path);
free(session->id);
free(session->seat);
return NULL;
}
const struct session_interface session_logind_iface = {
.start = logind_session_start,
.finish = logind_session_finish,
.open = logind_take_device,
.close = logind_release_device,
};

38
session/session.c Normal file
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@ -0,0 +1,38 @@
#include <stddef.h>
#include <wlr/session.h>
#include "session/interface.h"
static const struct session_interface *ifaces[] = {
#ifdef HAS_SYSTEMD
&session_logind_iface,
#endif
NULL,
};
struct wlr_session *wlr_session_start(void) {
const struct session_interface **iter;
for (iter = ifaces; *iter; ++iter) {
struct wlr_session *session = (*iter)->start();
if (session) {
return session;
}
}
return NULL;
}
void wlr_session_finish(struct wlr_session *session) {
session->iface.finish(session);
};
int wlr_session_open_file(struct wlr_session *restrict session,
const char *restrict path) {
return session->iface.open(session, path);
}
void wlr_session_close_file(struct wlr_session *session, int fd) {
session->iface.close(session, fd);
}