15460eaed2
We can only request one fd per device from systemd-logind. If a fd is re-used by the same device, releasing the fd from one device doesn't mean we can close it. The systemd code knows when it's really released, so let it close the fd. Test case: xorg.conf section for an input device with hotplugging enabled. evdev detects the duplicate and closes the hotplugged device, which closes the fd. The other instance of evdev thinks the fd is still valid so now you're playing a double lottery. First, which client(s) will get the evdev fd? Second, which requests will be picked up by evdev and which ones will be picked up by the client? You'll never know, but the fun is in finding out. Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> Reviewed-by: Hans de Goede <hdegoede@redhat.com>
609 lines
19 KiB
C
609 lines
19 KiB
C
/*
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* Copyright © 2013 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Author: Hans de Goede <hdegoede@redhat.com>
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*/
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#ifdef HAVE_XORG_CONFIG_H
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#include <xorg-config.h>
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#endif
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#include <dbus/dbus.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "os.h"
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#include "dbus-core.h"
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#include "xf86.h"
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#include "xf86platformBus.h"
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#include "xf86Xinput.h"
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#include "systemd-logind.h"
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#define DBUS_TIMEOUT 500 /* Wait max 0.5 seconds */
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struct systemd_logind_info {
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DBusConnection *conn;
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char *session;
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Bool active;
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Bool vt_active;
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};
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static struct systemd_logind_info logind_info;
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static InputInfoPtr
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systemd_logind_find_info_ptr_by_devnum(InputInfoPtr start,
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int major, int minor)
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{
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InputInfoPtr pInfo;
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for (pInfo = start; pInfo; pInfo = pInfo->next)
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if (pInfo->major == major && pInfo->minor == minor &&
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(pInfo->flags & XI86_SERVER_FD))
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return pInfo;
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return NULL;
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}
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static void
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systemd_logind_set_input_fd_for_all_devs(int major, int minor, int fd,
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Bool enable)
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{
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InputInfoPtr pInfo;
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pInfo = systemd_logind_find_info_ptr_by_devnum(xf86InputDevs, major, minor);
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while (pInfo) {
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pInfo->fd = fd;
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pInfo->options = xf86ReplaceIntOption(pInfo->options, "fd", fd);
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if (enable)
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xf86EnableInputDeviceForVTSwitch(pInfo);
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pInfo = systemd_logind_find_info_ptr_by_devnum(pInfo->next, major, minor);
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}
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}
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int
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systemd_logind_take_fd(int _major, int _minor, const char *path,
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Bool *paused_ret)
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{
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struct systemd_logind_info *info = &logind_info;
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InputInfoPtr pInfo;
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DBusError error;
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DBusMessage *msg = NULL;
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DBusMessage *reply = NULL;
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dbus_int32_t major = _major;
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dbus_int32_t minor = _minor;
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dbus_bool_t paused;
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int fd = -1;
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if (!info->session || major == 0)
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return -1;
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/* logind does not support mouse devs (with evdev we don't need them) */
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if (strstr(path, "mouse"))
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return -1;
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/* Check if we already have an InputInfo entry with this major, minor
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* (shared device-nodes happen ie with Wacom tablets). */
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pInfo = systemd_logind_find_info_ptr_by_devnum(xf86InputDevs, major, minor);
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if (pInfo) {
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LogMessage(X_INFO, "systemd-logind: returning pre-existing fd for %s %u:%u\n",
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path, major, minor);
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*paused_ret = FALSE;
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return pInfo->fd;
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}
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dbus_error_init(&error);
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msg = dbus_message_new_method_call("org.freedesktop.login1", info->session,
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"org.freedesktop.login1.Session", "TakeDevice");
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if (!msg) {
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LogMessage(X_ERROR, "systemd-logind: out of memory\n");
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goto cleanup;
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}
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if (!dbus_message_append_args(msg, DBUS_TYPE_UINT32, &major,
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DBUS_TYPE_UINT32, &minor,
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DBUS_TYPE_INVALID)) {
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LogMessage(X_ERROR, "systemd-logind: out of memory\n");
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goto cleanup;
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}
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reply = dbus_connection_send_with_reply_and_block(info->conn, msg,
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DBUS_TIMEOUT, &error);
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if (!reply) {
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LogMessage(X_ERROR, "systemd-logind: failed to take device %s: %s\n",
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path, error.message);
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goto cleanup;
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}
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if (!dbus_message_get_args(reply, &error,
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DBUS_TYPE_UNIX_FD, &fd,
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DBUS_TYPE_BOOLEAN, &paused,
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DBUS_TYPE_INVALID)) {
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LogMessage(X_ERROR, "systemd-logind: TakeDevice %s: %s\n",
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path, error.message);
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goto cleanup;
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}
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*paused_ret = paused;
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LogMessage(X_INFO, "systemd-logind: got fd for %s %u:%u fd %d paused %d\n",
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path, major, minor, fd, paused);
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cleanup:
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if (msg)
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dbus_message_unref(msg);
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if (reply)
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dbus_message_unref(reply);
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dbus_error_free(&error);
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return fd;
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}
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void
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systemd_logind_release_fd(int _major, int _minor, int fd)
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{
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struct systemd_logind_info *info = &logind_info;
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InputInfoPtr pInfo;
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DBusError error;
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DBusMessage *msg = NULL;
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DBusMessage *reply = NULL;
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dbus_int32_t major = _major;
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dbus_int32_t minor = _minor;
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int matches = 0;
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if (!info->session || major == 0)
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goto close;
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/* Only release the fd if there is only 1 InputInfo left for this major
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* and minor, otherwise other InputInfo's are still referencing the fd. */
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pInfo = systemd_logind_find_info_ptr_by_devnum(xf86InputDevs, major, minor);
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while (pInfo) {
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matches++;
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pInfo = systemd_logind_find_info_ptr_by_devnum(pInfo->next, major, minor);
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}
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if (matches > 1) {
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LogMessage(X_INFO, "systemd-logind: not releasing fd for %u:%u, still in use\n", major, minor);
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return;
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}
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LogMessage(X_INFO, "systemd-logind: releasing fd for %u:%u\n", major, minor);
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dbus_error_init(&error);
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msg = dbus_message_new_method_call("org.freedesktop.login1", info->session,
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"org.freedesktop.login1.Session", "ReleaseDevice");
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if (!msg) {
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LogMessage(X_ERROR, "systemd-logind: out of memory\n");
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goto cleanup;
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}
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if (!dbus_message_append_args(msg, DBUS_TYPE_UINT32, &major,
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DBUS_TYPE_UINT32, &minor,
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DBUS_TYPE_INVALID)) {
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LogMessage(X_ERROR, "systemd-logind: out of memory\n");
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goto cleanup;
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}
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reply = dbus_connection_send_with_reply_and_block(info->conn, msg,
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DBUS_TIMEOUT, &error);
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if (!reply)
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LogMessage(X_ERROR, "systemd-logind: failed to release device: %s\n",
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error.message);
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cleanup:
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if (msg)
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dbus_message_unref(msg);
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if (reply)
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dbus_message_unref(reply);
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dbus_error_free(&error);
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close:
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if (fd != -1)
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close(fd);
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}
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int
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systemd_logind_controls_session(void)
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{
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return logind_info.session ? 1 : 0;
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}
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void
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systemd_logind_vtenter(void)
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{
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struct systemd_logind_info *info = &logind_info;
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InputInfoPtr pInfo;
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int i;
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if (!info->session)
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return; /* Not using systemd-logind */
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if (!info->active)
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return; /* Session not active */
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if (info->vt_active)
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return; /* Already did vtenter */
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for (i = 0; i < xf86_num_platform_devices; i++) {
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if (xf86_platform_devices[i].flags & XF86_PDEV_PAUSED)
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break;
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}
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if (i != xf86_num_platform_devices)
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return; /* Some drm nodes are still paused wait for resume */
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xf86VTEnter();
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info->vt_active = TRUE;
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/* Activate any input devices which were resumed before the drm nodes */
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for (pInfo = xf86InputDevs; pInfo; pInfo = pInfo->next)
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if ((pInfo->flags & XI86_SERVER_FD) && pInfo->fd != -1)
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xf86EnableInputDeviceForVTSwitch(pInfo);
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/* Do delayed input probing, this must be done after the above enabling */
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xf86InputEnableVTProbe();
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}
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static void
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systemd_logind_ack_pause(struct systemd_logind_info *info,
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dbus_int32_t minor, dbus_int32_t major)
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{
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DBusError error;
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DBusMessage *msg = NULL;
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DBusMessage *reply = NULL;
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dbus_error_init(&error);
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msg = dbus_message_new_method_call("org.freedesktop.login1", info->session,
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"org.freedesktop.login1.Session", "PauseDeviceComplete");
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if (!msg) {
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LogMessage(X_ERROR, "systemd-logind: out of memory\n");
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goto cleanup;
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}
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if (!dbus_message_append_args(msg, DBUS_TYPE_UINT32, &major,
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DBUS_TYPE_UINT32, &minor,
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DBUS_TYPE_INVALID)) {
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LogMessage(X_ERROR, "systemd-logind: out of memory\n");
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goto cleanup;
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}
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reply = dbus_connection_send_with_reply_and_block(info->conn, msg,
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DBUS_TIMEOUT, &error);
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if (!reply)
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LogMessage(X_ERROR, "systemd-logind: failed to ack pause: %s\n",
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error.message);
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cleanup:
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if (msg)
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dbus_message_unref(msg);
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if (reply)
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dbus_message_unref(reply);
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dbus_error_free(&error);
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}
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static DBusHandlerResult
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message_filter(DBusConnection * connection, DBusMessage * message, void *data)
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{
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struct systemd_logind_info *info = data;
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struct xf86_platform_device *pdev = NULL;
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InputInfoPtr pInfo = NULL;
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int ack = 0, pause = 0, fd = -1;
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DBusError error;
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dbus_int32_t major, minor;
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char *pause_str;
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dbus_error_init(&error);
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if (dbus_message_is_signal(message,
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"org.freedesktop.DBus", "NameOwnerChanged")) {
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char *name, *old_owner, *new_owner;
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dbus_message_get_args(message, &error,
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DBUS_TYPE_STRING, &name,
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DBUS_TYPE_STRING, &old_owner,
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DBUS_TYPE_STRING, &new_owner, DBUS_TYPE_INVALID);
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if (dbus_error_is_set(&error)) {
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LogMessage(X_ERROR, "systemd-logind: NameOwnerChanged: %s\n",
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error.message);
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dbus_error_free(&error);
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return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
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}
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if (name && strcmp(name, "org.freedesktop.login1") == 0)
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FatalError("systemd-logind disappeared (stopped/restarted?)\n");
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return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
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}
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if (strcmp(dbus_message_get_path(message), info->session) != 0)
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return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
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if (dbus_message_is_signal(message, "org.freedesktop.login1.Session",
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"PauseDevice")) {
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if (!dbus_message_get_args(message, &error,
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DBUS_TYPE_UINT32, &major,
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DBUS_TYPE_UINT32, &minor,
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DBUS_TYPE_STRING, &pause_str,
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DBUS_TYPE_INVALID)) {
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LogMessage(X_ERROR, "systemd-logind: PauseDevice: %s\n",
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error.message);
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dbus_error_free(&error);
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return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
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}
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if (strcmp(pause_str, "pause") == 0) {
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pause = 1;
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ack = 1;
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}
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else if (strcmp(pause_str, "force") == 0) {
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pause = 1;
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}
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else if (strcmp(pause_str, "gone") == 0) {
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/* Device removal is handled through udev */
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return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
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}
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else {
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LogMessage(X_WARNING, "systemd-logind: unknown pause type: %s\n",
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pause_str);
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return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
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}
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}
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else if (dbus_message_is_signal(message, "org.freedesktop.login1.Session",
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"ResumeDevice")) {
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if (!dbus_message_get_args(message, &error,
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DBUS_TYPE_UINT32, &major,
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DBUS_TYPE_UINT32, &minor,
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DBUS_TYPE_UNIX_FD, &fd,
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DBUS_TYPE_INVALID)) {
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LogMessage(X_ERROR, "systemd-logind: ResumeDevice: %s\n",
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error.message);
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dbus_error_free(&error);
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return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
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}
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} else
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return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
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LogMessage(X_INFO, "systemd-logind: got %s for %u:%u\n",
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pause ? "pause" : "resume", major, minor);
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pdev = xf86_find_platform_device_by_devnum(major, minor);
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if (!pdev)
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pInfo = systemd_logind_find_info_ptr_by_devnum(xf86InputDevs,
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major, minor);
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if (!pdev && !pInfo) {
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LogMessage(X_WARNING, "systemd-logind: could not find dev %u:%u\n",
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major, minor);
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return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
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}
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if (pause) {
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/* Our VT_PROCESS usage guarantees we've already given up the vt */
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info->active = info->vt_active = FALSE;
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/* Note the actual vtleave has already been handled by xf86Events.c */
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if (pdev)
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pdev->flags |= XF86_PDEV_PAUSED;
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else {
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close(pInfo->fd);
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systemd_logind_set_input_fd_for_all_devs(major, minor, -1, FALSE);
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}
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if (ack)
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systemd_logind_ack_pause(info, major, minor);
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}
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else {
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/* info->vt_active gets set by systemd_logind_vtenter() */
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info->active = TRUE;
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if (pdev)
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pdev->flags &= ~XF86_PDEV_PAUSED;
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else
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systemd_logind_set_input_fd_for_all_devs(major, minor, fd,
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info->vt_active);
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/* Always call vtenter(), in case there are only legacy video devs */
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systemd_logind_vtenter();
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}
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return DBUS_HANDLER_RESULT_HANDLED;
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}
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static void
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connect_hook(DBusConnection *connection, void *data)
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{
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struct systemd_logind_info *info = data;
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DBusError error;
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DBusMessage *msg = NULL;
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DBusMessage *reply = NULL;
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dbus_int32_t arg;
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char *session = NULL;
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dbus_error_init(&error);
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msg = dbus_message_new_method_call("org.freedesktop.login1",
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"/org/freedesktop/login1", "org.freedesktop.login1.Manager",
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"GetSessionByPID");
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if (!msg) {
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LogMessage(X_ERROR, "systemd-logind: out of memory\n");
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goto cleanup;
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}
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arg = getpid();
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if (!dbus_message_append_args(msg, DBUS_TYPE_UINT32, &arg,
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DBUS_TYPE_INVALID)) {
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LogMessage(X_ERROR, "systemd-logind: out of memory\n");
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goto cleanup;
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}
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reply = dbus_connection_send_with_reply_and_block(connection, msg,
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DBUS_TIMEOUT, &error);
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if (!reply) {
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LogMessage(X_ERROR, "systemd-logind: failed to get session: %s\n",
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error.message);
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goto cleanup;
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}
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dbus_message_unref(msg);
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if (!dbus_message_get_args(reply, &error, DBUS_TYPE_OBJECT_PATH, &session,
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DBUS_TYPE_INVALID)) {
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LogMessage(X_ERROR, "systemd-logind: GetSessionByPID: %s\n",
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error.message);
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goto cleanup;
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}
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session = XNFstrdup(session);
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dbus_message_unref(reply);
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reply = NULL;
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msg = dbus_message_new_method_call("org.freedesktop.login1",
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session, "org.freedesktop.login1.Session", "TakeControl");
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if (!msg) {
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LogMessage(X_ERROR, "systemd-logind: out of memory\n");
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goto cleanup;
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}
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arg = FALSE; /* Don't forcibly take over over the session */
|
|
if (!dbus_message_append_args(msg, DBUS_TYPE_BOOLEAN, &arg,
|
|
DBUS_TYPE_INVALID)) {
|
|
LogMessage(X_ERROR, "systemd-logind: out of memory\n");
|
|
goto cleanup;
|
|
}
|
|
|
|
reply = dbus_connection_send_with_reply_and_block(connection, msg,
|
|
DBUS_TIMEOUT, &error);
|
|
if (!reply) {
|
|
LogMessage(X_ERROR, "systemd-logind: TakeControl failed: %s\n",
|
|
error.message);
|
|
goto cleanup;
|
|
}
|
|
|
|
dbus_bus_add_match(connection,
|
|
"type='signal',sender='org.freedesktop.DBus',interface='org.freedesktop.DBus',member='NameOwnerChanged',path='/org/freedesktop/DBus'",
|
|
&error);
|
|
if (dbus_error_is_set(&error)) {
|
|
LogMessage(X_ERROR, "systemd-logind: could not add match: %s\n",
|
|
error.message);
|
|
goto cleanup;
|
|
}
|
|
|
|
/*
|
|
* HdG: This is not useful with systemd <= 208 since the signal only
|
|
* contains invalidated property names there, rather than property, val
|
|
* pairs as it should. Instead we just use the first resume / pause now.
|
|
*/
|
|
#if 0
|
|
snprintf(match, sizeof(match),
|
|
"type='signal',sender='org.freedesktop.login1',interface='org.freedesktop.DBus.Properties',member='PropertiesChanged',path='%s'",
|
|
session);
|
|
dbus_bus_add_match(connection, match, &error);
|
|
if (dbus_error_is_set(&error)) {
|
|
LogMessage(X_ERROR, "systemd-logind: could not add match: %s\n",
|
|
error.message);
|
|
goto cleanup;
|
|
}
|
|
#endif
|
|
|
|
if (!dbus_connection_add_filter(connection, message_filter, info, NULL)) {
|
|
LogMessage(X_ERROR, "systemd-logind: could not add filter: %s\n",
|
|
error.message);
|
|
goto cleanup;
|
|
}
|
|
|
|
LogMessage(X_INFO, "systemd-logind: took control of session %s\n",
|
|
session);
|
|
info->conn = connection;
|
|
info->session = session;
|
|
info->vt_active = info->active = TRUE; /* The server owns the vt during init */
|
|
session = NULL;
|
|
|
|
cleanup:
|
|
free(session);
|
|
if (msg)
|
|
dbus_message_unref(msg);
|
|
if (reply)
|
|
dbus_message_unref(reply);
|
|
dbus_error_free(&error);
|
|
}
|
|
|
|
static void
|
|
systemd_logind_release_control(struct systemd_logind_info *info)
|
|
{
|
|
DBusError error;
|
|
DBusMessage *msg = NULL;
|
|
DBusMessage *reply = NULL;
|
|
|
|
dbus_error_init(&error);
|
|
|
|
msg = dbus_message_new_method_call("org.freedesktop.login1",
|
|
info->session, "org.freedesktop.login1.Session", "ReleaseControl");
|
|
if (!msg) {
|
|
LogMessage(X_ERROR, "systemd-logind: out of memory\n");
|
|
goto cleanup;
|
|
}
|
|
|
|
reply = dbus_connection_send_with_reply_and_block(info->conn, msg,
|
|
DBUS_TIMEOUT, &error);
|
|
if (!reply) {
|
|
LogMessage(X_ERROR, "systemd-logind: ReleaseControl failed: %s\n",
|
|
error.message);
|
|
goto cleanup;
|
|
}
|
|
|
|
cleanup:
|
|
if (msg)
|
|
dbus_message_unref(msg);
|
|
if (reply)
|
|
dbus_message_unref(reply);
|
|
dbus_error_free(&error);
|
|
}
|
|
|
|
static void
|
|
disconnect_hook(void *data)
|
|
{
|
|
struct systemd_logind_info *info = data;
|
|
|
|
free(info->session);
|
|
info->session = NULL;
|
|
info->conn = NULL;
|
|
}
|
|
|
|
static struct dbus_core_hook core_hook = {
|
|
.connect = connect_hook,
|
|
.disconnect = disconnect_hook,
|
|
.data = &logind_info,
|
|
};
|
|
|
|
int
|
|
systemd_logind_init(void)
|
|
{
|
|
return dbus_core_add_hook(&core_hook);
|
|
}
|
|
|
|
void
|
|
systemd_logind_fini(void)
|
|
{
|
|
if (logind_info.session)
|
|
systemd_logind_release_control(&logind_info);
|
|
|
|
dbus_core_remove_hook(&core_hook);
|
|
}
|