diff options
Diffstat (limited to 'src/login/multi-seat-x.c')
| -rw-r--r-- | src/login/multi-seat-x.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/src/login/multi-seat-x.c b/src/login/multi-seat-x.c new file mode 100644 index 0000000000..7133e026dc --- /dev/null +++ b/src/login/multi-seat-x.c @@ -0,0 +1,195 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2011 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <string.h> +#include <unistd.h> + +#include <libudev.h> + +#include "util.h" + +int main(int argc, char *argv[]) { + + struct udev *udev = NULL; + struct udev_enumerate *enumerator = NULL; + struct udev_list_entry *first, *item; + int i; + const char *seat = NULL; + char **new_argv; + char *path = NULL, *device_node = NULL; + int r; + FILE *f = NULL; + + /* This binary will go away as soon as X natively supports + * display enumeration with udev in a way that covers both PCI + * and USB. */ + + /* This will simply determine the fb device id of the graphics + * device assigned to a seat and write a configuration file + * from it and then spawn the real X server. */ + + /* If this file is removed, don't forget to remove the code + * that invokes this in gdm and other display managers. */ + + for (i = 1; i < argc; i++) + if (streq(argv[i], "-seat")) + seat = argv[i+1]; + + if (isempty(seat) || streq(seat, "seat0")) { + argv[0] = (char*) X_SERVER; + execv(X_SERVER, argv); + log_error("Failed to execute real X server: %m"); + goto fail; + } + + udev = udev_new(); + if (!udev) { + log_error("Failed to allocate udev environment."); + goto fail; + } + + enumerator = udev_enumerate_new(udev); + if (!enumerator) { + log_error("Failed to allocate udev enumerator."); + goto fail; + } + + udev_enumerate_add_match_subsystem(enumerator, "graphics"); + udev_enumerate_add_match_tag(enumerator, seat); + + r = udev_enumerate_scan_devices(enumerator); + if (r < 0) { + log_error("Failed to enumerate devices."); + goto fail; + } + + first = udev_enumerate_get_list_entry(enumerator); + udev_list_entry_foreach(item, first) { + struct udev_device *d; + const char *dn; + + d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); + if (!d) + continue; + + dn = udev_device_get_devnode(d); + + if (dn) { + device_node = strdup(dn); + if (!device_node) { + udev_device_unref(d); + log_error("Out of memory."); + goto fail; + } + } + + udev_device_unref(d); + + if (device_node) + break; + } + + if (!device_node) { + log_error("Failed to find device node for seat %s.", seat); + goto fail; + } + + r = safe_mkdir("/run/systemd/multi-session-x", 0755, 0, 0); + if (r < 0) { + log_error("Failed to create directory: %s", strerror(-r)); + goto fail; + } + + path = strappend("/run/systemd/multi-session-x/", seat); + if (!path) { + log_error("Out of memory"); + goto fail; + } + + f = fopen(path, "we"); + if (!f) { + log_error("Failed to write configuration file: %m"); + goto fail; + } + + fprintf(f, + "Section \"Device\"\n" + " Identifier \"udev\"\n" + " Driver \"fbdev\"\n" + " Option \"fbdev\" \"%s\"\n" + "EndSection\n" + "Section \"ServerFlags\"\n" + " Option \"AutoAddDevices\" \"True\"\n" + " Option \"AllowEmptyInput\" \"True\"\n" + " Option \"DontVTSwitch\" \"True\"\n" + "EndSection\n" + "Section \"InputClass\"\n" + " Identifier \"Force Input Devices to Seat\"\n" + " Option \"GrabDevice\" \"True\"\n" + "EndSection\n", + device_node); + + fflush(f); + + if (ferror(f)) { + log_error("Failed to write configuration file: %m"); + goto fail; + } + + fclose(f); + f = NULL; + + new_argv = alloca(sizeof(char*) * (argc + 3 + 1)); + memcpy(new_argv, argv, sizeof(char*) * (argc + 2 + 1)); + + new_argv[0] = (char*) X_SERVER; + new_argv[argc+0] = (char*) "-config"; + new_argv[argc+1] = path; + new_argv[argc+2] = (char*) "-sharevts"; + new_argv[argc+3] = NULL; + + udev_enumerate_unref(enumerator); + enumerator = NULL; + + udev_unref(udev); + udev = NULL; + + free(device_node); + device_node = NULL; + + execv(X_SERVER, new_argv); + log_error("Failed to execute real X server: %m"); + +fail: + if (enumerator) + udev_enumerate_unref(enumerator); + + if (udev) + udev_unref(udev); + + free(path); + free(device_node); + + if (f) + fclose(f); + + return EXIT_FAILURE; +} |