Kristian Høgsberg
13 years ago
parent
102bf0335d
commit
e10b124ef5
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/*
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* Copyright © 2011 Intel Corporation |
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* |
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* Permission to use, copy, modify, distribute, and sell this software and |
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* its documentation for any purpose is hereby granted without fee, provided |
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* that the above copyright notice appear in all copies and that both that |
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* copyright notice and this permission notice appear in supporting |
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* documentation, and that the name of the copyright holders not be used in |
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* advertising or publicity pertaining to distribution of the software |
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* without specific, written prior permission. The copyright holders make |
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* no representations about the suitability of this software for any |
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* purpose. It is provided "as is" without express or implied warranty. |
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* |
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS |
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY |
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER |
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF |
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* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#define _GNU_SOURCE |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <sys/socket.h> |
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#include <sys/un.h> |
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#include <fcntl.h> |
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#include <errno.h> |
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#include <unistd.h> |
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#include <signal.h> |
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#include "xwayland.h" |
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#include "xserver-server-protocol.h" |
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static int |
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weston_xserver_handle_event(int listen_fd, uint32_t mask, void *data) |
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{ |
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struct weston_xserver *mxs = data; |
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char display[8], s[8]; |
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int sv[2], client_fd; |
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if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sv) < 0) { |
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fprintf(stderr, "socketpair failed\n"); |
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return 1; |
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} |
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mxs->process.pid = fork(); |
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switch (mxs->process.pid) { |
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case 0: |
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/* SOCK_CLOEXEC closes both ends, so we need to unset
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* the flag on the client fd. */ |
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client_fd = dup(sv[1]); |
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if (client_fd < 0) |
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return 1; |
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snprintf(s, sizeof s, "%d", client_fd); |
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setenv("WAYLAND_SOCKET", s, 1); |
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snprintf(display, sizeof display, ":%d", mxs->display); |
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if (execl(XSERVER_PATH, |
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XSERVER_PATH, |
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display, |
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"-wayland", |
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"-rootless", |
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"-retro", |
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"-nolisten", "all", |
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"-terminate", |
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NULL) < 0) |
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fprintf(stderr, "exec failed: %m\n"); |
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exit(-1); |
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default: |
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fprintf(stderr, "forked X server, pid %d\n", mxs->process.pid); |
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close(sv[1]); |
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mxs->client = wl_client_create(mxs->wl_display, sv[0]); |
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weston_watch_process(&mxs->process); |
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wl_event_source_remove(mxs->abstract_source); |
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wl_event_source_remove(mxs->unix_source); |
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break; |
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case -1: |
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fprintf(stderr, "failed to fork\n"); |
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break; |
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} |
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return 1; |
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} |
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static void |
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weston_xserver_shutdown(struct weston_xserver *wxs) |
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{ |
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char path[256]; |
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snprintf(path, sizeof path, "/tmp/.X%d-lock", wxs->display); |
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unlink(path); |
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snprintf(path, sizeof path, "/tmp/.X11-unix/X%d", wxs->display); |
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unlink(path); |
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if (wxs->process.pid == 0) { |
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wl_event_source_remove(wxs->abstract_source); |
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wl_event_source_remove(wxs->unix_source); |
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} |
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close(wxs->abstract_fd); |
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close(wxs->unix_fd); |
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if (wxs->wm) |
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weston_wm_destroy(wxs->wm); |
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wxs->loop = NULL; |
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} |
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static void |
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weston_xserver_cleanup(struct weston_process *process, int status) |
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{ |
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struct weston_xserver *mxs = |
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container_of(process, struct weston_xserver, process); |
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mxs->process.pid = 0; |
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mxs->client = NULL; |
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mxs->resource = NULL; |
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mxs->abstract_source = |
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wl_event_loop_add_fd(mxs->loop, mxs->abstract_fd, |
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WL_EVENT_READABLE, |
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weston_xserver_handle_event, mxs); |
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mxs->unix_source = |
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wl_event_loop_add_fd(mxs->loop, mxs->unix_fd, |
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WL_EVENT_READABLE, |
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weston_xserver_handle_event, mxs); |
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if (mxs->wm) { |
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fprintf(stderr, "xserver exited, code %d\n", status); |
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weston_wm_destroy(mxs->wm); |
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mxs->wm = NULL; |
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} else { |
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/* If the X server crashes before it binds to the
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* xserver interface, shut down and don't try |
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* again. */ |
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fprintf(stderr, "xserver crashing too fast: %d\n", status); |
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weston_xserver_shutdown(mxs); |
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} |
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} |
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static void |
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bind_xserver(struct wl_client *client, |
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void *data, uint32_t version, uint32_t id) |
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{ |
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struct weston_xserver *wxs = data; |
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/* If it's a different client than the xserver we launched,
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* don't start the wm. */ |
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if (client != wxs->client) |
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return; |
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wxs->resource =
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wl_client_add_object(client, &xserver_interface, |
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&xserver_implementation, id, wxs); |
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wxs->wm = weston_wm_create(wxs); |
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if (wxs->wm == NULL) { |
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fprintf(stderr, "failed to create wm\n"); |
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} |
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xserver_send_listen_socket(wxs->resource, wxs->abstract_fd); |
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xserver_send_listen_socket(wxs->resource, wxs->unix_fd); |
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} |
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static int |
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bind_to_abstract_socket(int display) |
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{ |
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struct sockaddr_un addr; |
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socklen_t size, name_size; |
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int fd; |
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fd = socket(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0); |
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if (fd < 0) |
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return -1; |
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addr.sun_family = AF_LOCAL; |
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name_size = snprintf(addr.sun_path, sizeof addr.sun_path, |
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"%c/tmp/.X11-unix/X%d", 0, display); |
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size = offsetof(struct sockaddr_un, sun_path) + name_size; |
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if (bind(fd, (struct sockaddr *) &addr, size) < 0) { |
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fprintf(stderr, "failed to bind to @%s: %s\n", |
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addr.sun_path + 1, strerror(errno)); |
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close(fd); |
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return -1; |
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} |
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if (listen(fd, 1) < 0) { |
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close(fd); |
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return -1; |
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} |
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return fd; |
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} |
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static int |
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bind_to_unix_socket(int display) |
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{ |
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struct sockaddr_un addr; |
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socklen_t size, name_size; |
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int fd; |
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fd = socket(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0); |
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if (fd < 0) |
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return -1; |
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addr.sun_family = AF_LOCAL; |
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name_size = snprintf(addr.sun_path, sizeof addr.sun_path, |
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"/tmp/.X11-unix/X%d", display) + 1; |
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size = offsetof(struct sockaddr_un, sun_path) + name_size; |
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unlink(addr.sun_path); |
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if (bind(fd, (struct sockaddr *) &addr, size) < 0) { |
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fprintf(stderr, "failed to bind to %s (%s)\n", |
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addr.sun_path, strerror(errno)); |
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close(fd); |
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return -1; |
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} |
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if (listen(fd, 1) < 0) { |
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unlink(addr.sun_path); |
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close(fd); |
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return -1; |
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} |
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return fd; |
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} |
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static int |
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create_lockfile(int display, char *lockfile, size_t lsize) |
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{ |
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char pid[16], *end; |
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int fd, size; |
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pid_t other; |
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snprintf(lockfile, lsize, "/tmp/.X%d-lock", display); |
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fd = open(lockfile, O_WRONLY | O_CLOEXEC | O_CREAT | O_EXCL, 0444); |
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if (fd < 0 && errno == EEXIST) { |
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fd = open(lockfile, O_CLOEXEC, O_RDONLY); |
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if (fd < 0 || read(fd, pid, 11) != 11) { |
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fprintf(stderr, "can't read lock file %s: %s\n", |
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lockfile, strerror(errno)); |
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errno = EEXIST; |
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return -1; |
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} |
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other = strtol(pid, &end, 0); |
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if (end != pid + 10) { |
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fprintf(stderr, "can't parse lock file %s\n", |
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lockfile); |
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close(fd); |
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errno = EEXIST; |
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return -1; |
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} |
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if (kill(other, 0) < 0 && errno == ESRCH) { |
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/* stale lock file; unlink and try again */ |
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fprintf(stderr, |
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"unlinking stale lock file %s\n", lockfile); |
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close(fd); |
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if (unlink(lockfile)) |
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/* If we fail to unlink, return EEXIST
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so we try the next display number.*/ |
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errno = EEXIST; |
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else |
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errno = EAGAIN; |
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return -1; |
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} |
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errno = EEXIST; |
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return -1; |
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} else if (fd < 0) { |
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fprintf(stderr, "failed to create lock file %s: %s\n", |
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lockfile, strerror(errno)); |
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return -1; |
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} |
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/* Subtle detail: we use the pid of the wayland
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* compositor, not the xserver in the lock file. */ |
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size = snprintf(pid, sizeof pid, "%10d\n", getpid()); |
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if (write(fd, pid, size) != size) { |
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unlink(lockfile); |
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close(fd); |
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return -1; |
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} |
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close(fd); |
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return 0; |
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} |
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static void |
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weston_xserver_destroy(struct wl_listener *l, void *data) |
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{ |
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struct weston_xserver *wxs = |
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container_of(l, struct weston_xserver, destroy_listener); |
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if (!wxs) |
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return; |
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if (wxs->loop) |
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weston_xserver_shutdown(wxs); |
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free(wxs); |
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} |
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WL_EXPORT int |
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weston_xserver_init(struct weston_compositor *compositor) |
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{ |
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struct wl_display *display = compositor->wl_display; |
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struct weston_xserver *mxs; |
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char lockfile[256], display_name[8]; |
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mxs = malloc(sizeof *mxs); |
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memset(mxs, 0, sizeof *mxs); |
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mxs->process.cleanup = weston_xserver_cleanup; |
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mxs->wl_display = display; |
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mxs->compositor = compositor; |
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mxs->display = 0; |
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retry: |
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if (create_lockfile(mxs->display, lockfile, sizeof lockfile) < 0) { |
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if (errno == EAGAIN) { |
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goto retry; |
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} else if (errno == EEXIST) { |
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mxs->display++; |
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goto retry; |
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} else { |
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free(mxs); |
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return -1; |
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} |
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} |
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mxs->abstract_fd = bind_to_abstract_socket(mxs->display); |
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if (mxs->abstract_fd < 0 && errno == EADDRINUSE) { |
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mxs->display++; |
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unlink(lockfile); |
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goto retry; |
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} |
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mxs->unix_fd = bind_to_unix_socket(mxs->display); |
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if (mxs->unix_fd < 0) { |
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unlink(lockfile); |
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close(mxs->abstract_fd); |
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free(mxs); |
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return -1; |
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} |
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snprintf(display_name, sizeof display_name, ":%d", mxs->display); |
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fprintf(stderr, "xserver listening on display %s\n", display_name); |
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setenv("DISPLAY", display_name, 1); |
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mxs->loop = wl_display_get_event_loop(display); |
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mxs->abstract_source = |
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wl_event_loop_add_fd(mxs->loop, mxs->abstract_fd, |
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WL_EVENT_READABLE, |
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weston_xserver_handle_event, mxs); |
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mxs->unix_source = |
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wl_event_loop_add_fd(mxs->loop, mxs->unix_fd, |
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WL_EVENT_READABLE, |
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weston_xserver_handle_event, mxs); |
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wl_display_add_global(display, &xserver_interface, mxs, bind_xserver); |
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mxs->destroy_listener.notify = weston_xserver_destroy; |
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wl_signal_add(&compositor->destroy_signal, &mxs->destroy_listener); |
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return 0; |
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} |
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Loading…
Reference in new issue