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36db9a8d LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <string.h> | |
23 | #include <unistd.h> | |
24 | ||
25 | #include <libudev.h> | |
26 | ||
27 | #include "util.h" | |
49e942b2 | 28 | #include "mkdir.h" |
36db9a8d LP |
29 | |
30 | int main(int argc, char *argv[]) { | |
31 | ||
32 | struct udev *udev = NULL; | |
33 | struct udev_enumerate *enumerator = NULL; | |
34 | struct udev_list_entry *first, *item; | |
35 | int i; | |
36 | const char *seat = NULL; | |
37 | char **new_argv; | |
38 | char *path = NULL, *device_node = NULL; | |
39 | int r; | |
40 | FILE *f = NULL; | |
41 | ||
42 | /* This binary will go away as soon as X natively supports | |
43 | * display enumeration with udev in a way that covers both PCI | |
44 | * and USB. */ | |
45 | ||
46 | /* This will simply determine the fb device id of the graphics | |
47 | * device assigned to a seat and write a configuration file | |
48 | * from it and then spawn the real X server. */ | |
49 | ||
b16f5304 LP |
50 | /* If this file is removed, don't forget to remove the code |
51 | * that invokes this in gdm and other display managers. */ | |
52 | ||
36db9a8d LP |
53 | for (i = 1; i < argc; i++) |
54 | if (streq(argv[i], "-seat")) | |
55 | seat = argv[i+1]; | |
56 | ||
57 | if (isempty(seat) || streq(seat, "seat0")) { | |
58 | argv[0] = (char*) X_SERVER; | |
59 | execv(X_SERVER, argv); | |
60 | log_error("Failed to execute real X server: %m"); | |
61 | goto fail; | |
62 | } | |
63 | ||
64 | udev = udev_new(); | |
65 | if (!udev) { | |
66 | log_error("Failed to allocate udev environment."); | |
67 | goto fail; | |
68 | } | |
69 | ||
70 | enumerator = udev_enumerate_new(udev); | |
71 | if (!enumerator) { | |
72 | log_error("Failed to allocate udev enumerator."); | |
73 | goto fail; | |
74 | } | |
75 | ||
76 | udev_enumerate_add_match_subsystem(enumerator, "graphics"); | |
77 | udev_enumerate_add_match_tag(enumerator, seat); | |
78 | ||
79 | r = udev_enumerate_scan_devices(enumerator); | |
80 | if (r < 0) { | |
81 | log_error("Failed to enumerate devices."); | |
82 | goto fail; | |
83 | } | |
84 | ||
85 | first = udev_enumerate_get_list_entry(enumerator); | |
86 | udev_list_entry_foreach(item, first) { | |
87 | struct udev_device *d; | |
88 | const char *dn; | |
89 | ||
90 | d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
91 | if (!d) | |
92 | continue; | |
93 | ||
94 | dn = udev_device_get_devnode(d); | |
95 | ||
be70cdd6 | 96 | if (dn) { |
36db9a8d LP |
97 | device_node = strdup(dn); |
98 | if (!device_node) { | |
99 | udev_device_unref(d); | |
100 | log_error("Out of memory."); | |
101 | goto fail; | |
102 | } | |
103 | } | |
104 | ||
105 | udev_device_unref(d); | |
106 | ||
107 | if (device_node) | |
108 | break; | |
109 | } | |
110 | ||
111 | if (!device_node) { | |
112 | log_error("Failed to find device node for seat %s.", seat); | |
113 | goto fail; | |
114 | } | |
115 | ||
116 | r = safe_mkdir("/run/systemd/multi-session-x", 0755, 0, 0); | |
117 | if (r < 0) { | |
118 | log_error("Failed to create directory: %s", strerror(-r)); | |
119 | goto fail; | |
120 | } | |
121 | ||
122 | path = strappend("/run/systemd/multi-session-x/", seat); | |
123 | if (!path) { | |
124 | log_error("Out of memory"); | |
125 | goto fail; | |
126 | } | |
127 | ||
128 | f = fopen(path, "we"); | |
129 | if (!f) { | |
130 | log_error("Failed to write configuration file: %m"); | |
131 | goto fail; | |
132 | } | |
133 | ||
134 | fprintf(f, | |
135 | "Section \"Device\"\n" | |
136 | " Identifier \"udev\"\n" | |
137 | " Driver \"fbdev\"\n" | |
138 | " Option \"fbdev\" \"%s\"\n" | |
139 | "EndSection\n" | |
140 | "Section \"ServerFlags\"\n" | |
141 | " Option \"AutoAddDevices\" \"True\"\n" | |
142 | " Option \"AllowEmptyInput\" \"True\"\n" | |
8906b207 RS |
143 | " Option \"DontVTSwitch\" \"True\"\n" |
144 | "EndSection\n" | |
145 | "Section \"InputClass\"\n" | |
146 | " Identifier \"Force Input Devices to Seat\"\n" | |
147 | " Option \"GrabDevice\" \"True\"\n" | |
36db9a8d LP |
148 | "EndSection\n", |
149 | device_node); | |
150 | ||
151 | fflush(f); | |
152 | ||
153 | if (ferror(f)) { | |
154 | log_error("Failed to write configuration file: %m"); | |
155 | goto fail; | |
156 | } | |
157 | ||
158 | fclose(f); | |
159 | f = NULL; | |
160 | ||
161 | new_argv = alloca(sizeof(char*) * (argc + 3 + 1)); | |
162 | memcpy(new_argv, argv, sizeof(char*) * (argc + 2 + 1)); | |
163 | ||
164 | new_argv[0] = (char*) X_SERVER; | |
165 | new_argv[argc+0] = (char*) "-config"; | |
166 | new_argv[argc+1] = path; | |
167 | new_argv[argc+2] = (char*) "-sharevts"; | |
168 | new_argv[argc+3] = NULL; | |
169 | ||
170 | udev_enumerate_unref(enumerator); | |
171 | enumerator = NULL; | |
172 | ||
173 | udev_unref(udev); | |
174 | udev = NULL; | |
175 | ||
176 | free(device_node); | |
177 | device_node = NULL; | |
178 | ||
179 | execv(X_SERVER, new_argv); | |
180 | log_error("Failed to execute real X server: %m"); | |
181 | ||
182 | fail: | |
183 | if (enumerator) | |
184 | udev_enumerate_unref(enumerator); | |
185 | ||
186 | if (udev) | |
187 | udev_unref(udev); | |
188 | ||
189 | free(path); | |
190 | free(device_node); | |
191 | ||
192 | if (f) | |
193 | fclose(f); | |
194 | ||
195 | return EXIT_FAILURE; | |
196 | } |