The ctx subsystem manages the CDEV devices for each seat. It currently allocates one manager device and a given number of legacy devices that can be accessed via subdirectories. Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
277 lines
6.2 KiB
C
277 lines
6.2 KiB
C
/*
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* uvtd - User-space VT daemon
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*
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* Copyright (c) 2012-2013 David Herrmann <dh.herrmann@googlemail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <errno.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/signalfd.h>
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#include "eloop.h"
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#include "shl_dlist.h"
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#include "shl_log.h"
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#include "uterm_input.h"
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#include "uterm_monitor.h"
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#include "uvt.h"
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#include "uvtd_ctx.h"
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struct app_seat {
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struct shl_dlist list;
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struct uvtd_app *app;
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struct uterm_monitor_seat *useat;
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struct uvtd_ctx *ctx;
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};
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struct uvtd_app {
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struct ev_eloop *eloop;
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struct uterm_monitor *mon;
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struct uvt_ctx *ctx;
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struct ev_fd *ctx_fd;
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struct shl_dlist seats;
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};
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static int app_seat_new(struct uvtd_app *app, const char *sname,
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struct uterm_monitor_seat *useat)
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{
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struct app_seat *seat;
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int ret;
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seat = malloc(sizeof(*seat));
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if (!seat)
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return -ENOMEM;
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log_debug("new seat %p on %s", seat, sname);
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memset(seat, 0, sizeof(*seat));
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seat->app = app;
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seat->useat = useat;
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ret = uvtd_ctx_new(&seat->ctx, sname, app->eloop, app->ctx);
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if (ret == -EEXIST) {
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log_debug("ignoring seat %s as it has real VTs", sname);
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goto err_free;
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} else if (ret) {
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goto err_free;
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}
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uterm_monitor_set_seat_data(seat->useat, seat);
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shl_dlist_link(&app->seats, &seat->list);
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return 0;
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err_free:
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free(seat);
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return ret;
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}
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static void app_seat_free(struct app_seat *seat)
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{
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log_debug("free seat %p", seat);
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shl_dlist_unlink(&seat->list);
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uterm_monitor_set_seat_data(seat->useat, NULL);
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uvtd_ctx_free(seat->ctx);
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free(seat);
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}
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static void app_monitor_event(struct uterm_monitor *mon,
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struct uterm_monitor_event *ev,
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void *data)
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{
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struct uvtd_app *app = data;
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struct app_seat *seat;
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int ret;
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switch (ev->type) {
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case UTERM_MONITOR_NEW_SEAT:
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ret = app_seat_new(app, ev->seat_name, ev->seat);
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if (ret)
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return;
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break;
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case UTERM_MONITOR_FREE_SEAT:
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if (ev->seat_data)
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app_seat_free(ev->seat_data);
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break;
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case UTERM_MONITOR_NEW_DEV:
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seat = ev->seat_data;
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if (!seat)
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return;
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switch (ev->dev_type) {
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case UTERM_MONITOR_INPUT:
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log_debug("new input device %s on seat %p",
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ev->dev_node, seat);
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break;
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}
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break;
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case UTERM_MONITOR_FREE_DEV:
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seat = ev->seat_data;
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if (!seat)
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return;
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switch (ev->dev_type) {
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case UTERM_MONITOR_INPUT:
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log_debug("free input device %s on seat %p",
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ev->dev_node, seat);
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break;
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}
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break;
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}
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}
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static void app_sig_generic(struct ev_eloop *eloop,
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struct signalfd_siginfo *info,
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void *data)
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{
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struct uvtd_app *app = data;
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log_info("terminating due to caught signal %d", info->ssi_signo);
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ev_eloop_exit(app->eloop);
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}
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static void app_sig_ignore(struct ev_eloop *eloop,
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struct signalfd_siginfo *info,
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void *data)
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{
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}
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static void app_ctx_event(struct ev_fd *fd, int mask, void *data)
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{
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struct uvtd_app *app = data;
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uvt_ctx_dispatch(app->ctx);
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if (!(mask & EV_READABLE) && mask & (EV_HUP | EV_ERR)) {
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log_error("HUP on UVT ctx fd");
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ev_eloop_rm_fd(fd);
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app->ctx_fd = NULL;
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}
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}
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static void destroy_app(struct uvtd_app *app)
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{
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ev_eloop_rm_fd(app->ctx_fd);
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uvt_ctx_unref(app->ctx);
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uterm_monitor_unref(app->mon);
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ev_eloop_unregister_signal_cb(app->eloop, SIGPIPE, app_sig_ignore,
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app);
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ev_eloop_unregister_signal_cb(app->eloop, SIGINT, app_sig_generic,
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app);
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ev_eloop_unregister_signal_cb(app->eloop, SIGTERM, app_sig_generic,
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app);
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ev_eloop_unref(app->eloop);
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}
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static int setup_app(struct uvtd_app *app)
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{
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int ret, fd;
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shl_dlist_init(&app->seats);
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ret = ev_eloop_new(&app->eloop, log_llog, NULL);
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if (ret) {
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log_error("cannot create eloop object: %d", ret);
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goto err_app;
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}
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ret = ev_eloop_register_signal_cb(app->eloop, SIGTERM,
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app_sig_generic, app);
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if (ret) {
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log_error("cannot register SIGTERM signal handler: %d", ret);
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goto err_app;
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}
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ret = ev_eloop_register_signal_cb(app->eloop, SIGINT,
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app_sig_generic, app);
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if (ret) {
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log_error("cannot register SIGINT signal handler: %d", ret);
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goto err_app;
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}
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ret = ev_eloop_register_signal_cb(app->eloop, SIGPIPE,
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app_sig_ignore, app);
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if (ret) {
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log_error("cannot register SIGPIPE signal handler: %d", ret);
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goto err_app;
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}
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ret = uterm_monitor_new(&app->mon, app->eloop, app_monitor_event, app);
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if (ret) {
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log_error("cannot create device monitor: %d", ret);
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goto err_app;
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}
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ret = uvt_ctx_new(&app->ctx, log_llog, NULL);
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if (ret) {
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log_error("cannot create UVT context: %d", ret);
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goto err_app;
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}
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fd = uvt_ctx_get_fd(app->ctx);
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if (fd >= 0) {
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ret = ev_eloop_new_fd(app->eloop, &app->ctx_fd, fd,
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EV_READABLE, app_ctx_event, app);
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if (ret) {
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log_error("cannot create UVT ctx efd: %d", ret);
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goto err_app;
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}
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}
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log_debug("scanning for devices...");
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uterm_monitor_scan(app->mon);
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return 0;
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err_app:
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destroy_app(app);
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return ret;
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}
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int main(int argc, char **argv)
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{
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int ret;
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struct uvtd_app app;
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log_set_config(&LOG_CONFIG_INFO(1, 1));
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log_print_init("uvtd");
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memset(&app, 0, sizeof(app));
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ret = setup_app(&app);
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if (ret)
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goto err_out;
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ev_eloop_run(app.eloop, -1);
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ret = 0;
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destroy_app(&app);
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err_out:
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if (ret)
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log_err("cannot initialize uvtd, errno %d: %s",
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ret, strerror(-ret));
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log_info("exiting");
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return -ret;
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}
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