summaryrefslogtreecommitdiff
path: root/libweston/launcher-weston-launch.c
blob: 7bac0a307b44dac20b8334b03f2ab5240aac29d7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
/*
 * Copyright © 2012 Benjamin Franzke
 * Copyright © 2013 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "config.h"

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <errno.h>
#include <signal.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/vt.h>
#include <linux/kd.h>
#include <linux/major.h>

#include <libweston/libweston.h>
#include "weston-launch.h"
#include "launcher-impl.h"

#define DRM_MAJOR 226

#ifndef KDSKBMUTE
#define KDSKBMUTE	0x4B51
#endif

#ifdef BUILD_DRM_COMPOSITOR

#include <xf86drm.h>

#else

static inline int
drmDropMaster(int drm_fd)
{
	return 0;
}

static inline int
drmSetMaster(int drm_fd)
{
	return 0;
}

#endif

/* major()/minor() */
#ifdef MAJOR_IN_MKDEV
#include <sys/mkdev.h>
#endif
#ifdef MAJOR_IN_SYSMACROS
#include <sys/sysmacros.h>
#endif

union cmsg_data { unsigned char b[4]; int fd; };

struct launcher_weston_launch {
	struct weston_launcher base;
	struct weston_compositor *compositor;
	struct wl_event_loop *loop;
	int fd;
	struct wl_event_source *source;

	int kb_mode, tty, drm_fd;
};

static int
launcher_weston_launch_open(struct weston_launcher *launcher_base,
		     const char *path, int flags)
{
	struct launcher_weston_launch *launcher = wl_container_of(launcher_base, launcher, base);
	int n, ret;
	struct msghdr msg;
	struct cmsghdr *cmsg;
	struct iovec iov;
	union cmsg_data *data;
	char control[CMSG_SPACE(sizeof data->fd)];
	ssize_t len;
	struct weston_launcher_open *message;

	n = sizeof(*message) + strlen(path) + 1;
	message = malloc(n);
	if (!message)
		return -1;

	message->header.opcode = WESTON_LAUNCHER_OPEN;
	message->flags = flags;
	strcpy(message->path, path);

	do {
		len = send(launcher->fd, message, n, 0);
	} while (len < 0 && errno == EINTR);
	free(message);

	memset(&msg, 0, sizeof msg);
	iov.iov_base = &ret;
	iov.iov_len = sizeof ret;
	msg.msg_iov = &iov;
	msg.msg_iovlen = 1;
	msg.msg_control = control;
	msg.msg_controllen = sizeof control;

	do {
		len = recvmsg(launcher->fd, &msg, MSG_CMSG_CLOEXEC);
	} while (len < 0 && errno == EINTR);

	if (len != sizeof ret ||
	    ret < 0)
		return -1;

	cmsg = CMSG_FIRSTHDR(&msg);
	if (!cmsg ||
	    cmsg->cmsg_level != SOL_SOCKET ||
	    cmsg->cmsg_type != SCM_RIGHTS) {
		fprintf(stderr, "invalid control message\n");
		return -1;
	}

	data = (union cmsg_data *) CMSG_DATA(cmsg);
	if (data->fd == -1) {
		fprintf(stderr, "missing drm fd in socket request\n");
		return -1;
	}

	return data->fd;
}

static void
launcher_weston_launch_close(struct weston_launcher *launcher_base, int fd)
{
	close(fd);
}

static void
launcher_weston_launch_restore(struct weston_launcher *launcher_base)
{
	struct launcher_weston_launch *launcher = wl_container_of(launcher_base, launcher, base);
	struct vt_mode mode = { 0 };

	if (ioctl(launcher->tty, KDSKBMUTE, 0) &&
	    ioctl(launcher->tty, KDSKBMODE, launcher->kb_mode))
		weston_log("failed to restore kb mode: %s\n",
			   strerror(errno));

	if (ioctl(launcher->tty, KDSETMODE, KD_TEXT))
		weston_log("failed to set KD_TEXT mode on tty: %s\n",
			   strerror(errno));

	/* We have to drop master before we switch the VT back in
	 * VT_AUTO, so we don't risk switching to a VT with another
	 * display server, that will then fail to set drm master. */
	drmDropMaster(launcher->drm_fd);

	mode.mode = VT_AUTO;
	if (ioctl(launcher->tty, VT_SETMODE, &mode) < 0)
		weston_log("could not reset vt handling\n");
}

static int
launcher_weston_launch_data(int fd, uint32_t mask, void *data)
{
	struct launcher_weston_launch *launcher = data;
	int len, ret;

	if (mask & (WL_EVENT_HANGUP | WL_EVENT_ERROR)) {
		weston_log("launcher socket closed, exiting\n");
		/* Normally the weston-launch will reset the tty, but
		 * in this case it died or something, so do it here so
		 * we don't end up with a stuck vt. */
		launcher_weston_launch_restore(&launcher->base);
		exit(-1);
	}

	do {
		len = recv(launcher->fd, &ret, sizeof ret, 0);
	} while (len < 0 && errno == EINTR);

	switch (ret) {
	case WESTON_LAUNCHER_ACTIVATE:
		launcher->compositor->session_active = true;
		wl_signal_emit(&launcher->compositor->session_signal,
			       launcher->compositor);
		break;
	case WESTON_LAUNCHER_DEACTIVATE:
		launcher->compositor->session_active = false;
		wl_signal_emit(&launcher->compositor->session_signal,
			       launcher->compositor);
		break;
	default:
		weston_log("unexpected event from weston-launch\n");
		break;
	}

	return 1;
}

static int
launcher_weston_launch_activate_vt(struct weston_launcher *launcher_base, int vt)
{
	struct launcher_weston_launch *launcher = wl_container_of(launcher_base, launcher, base);
	return ioctl(launcher->tty, VT_ACTIVATE, vt);
}

static int
launcher_weston_launch_connect(struct weston_launcher **out, struct weston_compositor *compositor,
			       int tty, const char *seat_id, bool sync_drm)
{
	struct launcher_weston_launch *launcher;
	struct wl_event_loop *loop;

	launcher = malloc(sizeof *launcher);
	if (launcher == NULL)
		return -ENOMEM;

	launcher->base.iface = &launcher_weston_launch_iface;
	* (struct launcher_weston_launch **) out = launcher;
	launcher->compositor = compositor;
	launcher->drm_fd = -1;
	launcher->fd = weston_environment_get_fd("WESTON_LAUNCHER_SOCK");
	if (launcher->fd != -1) {
		launcher->tty = weston_environment_get_fd("WESTON_TTY_FD");
		/* We don't get a chance to read out the original kb
		 * mode for the tty, so just hard code K_UNICODE here
		 * in case we have to clean if weston-launch dies. */
		launcher->kb_mode = K_UNICODE;

		loop = wl_display_get_event_loop(compositor->wl_display);
		launcher->source = wl_event_loop_add_fd(loop, launcher->fd,
							WL_EVENT_READABLE,
							launcher_weston_launch_data,
							launcher);
		if (launcher->source == NULL) {
			free(launcher);
			return -ENOMEM;
		}

		return 0;
	} else {
		return -1;
	}
}

static void
launcher_weston_launch_destroy(struct weston_launcher *launcher_base)
{
	struct launcher_weston_launch *launcher = wl_container_of(launcher_base, launcher, base);

	if (launcher->fd != -1) {
		close(launcher->fd);
		wl_event_source_remove(launcher->source);
	} else {
		launcher_weston_launch_restore(&launcher->base);
	}

	if (launcher->tty >= 0)
		close(launcher->tty);

	free(launcher);
}

static int
launcher_weston_launch_get_vt(struct weston_launcher *base)
{
	struct launcher_weston_launch *launcher = wl_container_of(base, launcher, base);
	struct stat s;
	if (fstat(launcher->tty, &s) < 0)
		return -1;

	return minor(s.st_rdev);
}

const struct launcher_interface launcher_weston_launch_iface = {
	.connect = launcher_weston_launch_connect,
	.destroy = launcher_weston_launch_destroy,
	.open = launcher_weston_launch_open,
	.close = launcher_weston_launch_close,
	.activate_vt = launcher_weston_launch_activate_vt,
	.get_vt = launcher_weston_launch_get_vt,
};