273 lines
7.3 KiB
C
273 lines
7.3 KiB
C
/*
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* Copyright (c) 2014, 2015, 2016 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* server.c
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* Display server main loop.
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*/
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#include <sys/socket.h>
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#include <sys/termmode.h>
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#include <sys/un.h>
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#include <sys/wait.h>
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#include <assert.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <poll.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <display-protocol.h>
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#include "connection.h"
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#include "display.h"
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#include "server.h"
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#include "vgafont.h"
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static int open_local_server_socket(const char* path, int flags)
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{
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size_t path_length = strlen(path);
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size_t addr_size = offsetof(struct sockaddr_un, sun_path) + path_length + 1;
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struct sockaddr_un* sockaddr = (struct sockaddr_un*) malloc(addr_size);
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if ( !sockaddr )
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return -1;
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sockaddr->sun_family = AF_LOCAL;
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strcpy(sockaddr->sun_path, path);
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int fd = socket(AF_LOCAL, SOCK_STREAM | flags, 0);
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if ( fd < 0 )
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return free(sockaddr), -1;
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if ( bind(fd, (const struct sockaddr*) sockaddr, addr_size) < 0 )
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return close(fd), free(sockaddr), -1;
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if ( listen(fd, SOMAXCONN) < 0 )
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return close(fd), free(sockaddr), -1;
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free(sockaddr);
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return fd;
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}
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void server_initialize(struct server* server, struct display* display)
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{
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memset(server, 0, sizeof(*server));
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server->display = display;
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load_font();
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server->tty_fd = 0;
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if ( !isatty(0) )
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{
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server->tty_fd = open("/dev/tty", O_RDONLY);
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if ( server->tty_fd < 0 )
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err(1, "/dev/tty");
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}
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server->mouse_fd = open("/dev/mouse", O_RDONLY | O_CLOEXEC);
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if ( server->mouse_fd < 0 )
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err(1, "%s", "/dev/mouse");
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server->server_path = "/run/display";
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server->server_fd = open_local_server_socket(server->server_path,
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SOCK_NONBLOCK | SOCK_CLOEXEC);
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if ( server->server_fd < 0 )
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err(1, "open_local_server_socket: %s", server->server_path);
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unsigned int termmode =
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TERMMODE_KBKEY | TERMMODE_UNICODE | TERMMODE_NONBLOCK;
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if ( settermmode(0, termmode) < 0 )
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err(1, "settermmode");
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server->pfds_count = server_pfds_count(server);
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server->pfds = (struct pollfd*)
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reallocarray(NULL, sizeof(struct pollfd), server->pfds_count);
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if ( !server->pfds )
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err(1, "malloc");
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}
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bool server_accept(struct server* server)
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{
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int client_fd = accept4(server->server_fd, NULL, NULL, SOCK_NONBLOCK);
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if ( client_fd < 0 )
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{
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warn("accept: %s", server->server_path);
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return false;
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}
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if ( server->connections_used == server->connections_length )
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{
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size_t new_length = server->connections_length * 2;
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if ( !new_length )
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new_length = 16;
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struct connection** new_connections = (struct connection**)
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reallocarray(server->connections, new_length,
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sizeof(struct connection*));
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if ( !new_connections )
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{
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warn("dropped connection: %s: malloc", server->server_path);
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close(client_fd);
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return false;
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}
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server->connections = new_connections;
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server->connections_length = new_length;
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}
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size_t new_pfds_count = server_pfds_count(server) + 1;
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struct pollfd* new_pfds = (struct pollfd*)
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reallocarray(server->pfds, sizeof(struct pollfd), new_pfds_count);
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if ( !new_pfds )
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{
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warn("dropped connection: %s: malloc", server->server_path);
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close(client_fd);
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return false;
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}
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server->pfds = new_pfds;
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server->pfds_count = new_pfds_count;
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struct connection* connection = (struct connection*)
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malloc(sizeof(struct connection));
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if ( !connection )
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{
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warn("dropped connection: %s: malloc", server->server_path);
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close(client_fd);
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return false;
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}
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server->connections[server->connections_used++] = connection;
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connection_initialize(connection, server->display, client_fd);
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return true;
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}
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size_t server_pfds_count(const struct server* server)
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{
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return 3 + server->connections_used;
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}
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void server_poll(struct server* server)
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{
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int code;
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while ( 0 < waitpid(-1, &code, WNOHANG) )
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{
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}
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struct pollfd* pfds = server->pfds;
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pfds[0].fd = server->server_fd;
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pfds[0].events = POLLIN;
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pfds[0].revents = 0;
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pfds[1].fd = server->tty_fd;
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pfds[1].events = POLLIN;
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pfds[1].revents = 0;
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pfds[2].fd = server->mouse_fd;
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pfds[2].events = POLLIN;
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pfds[2].revents = 0;
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size_t cpfd_off = 3;
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size_t connections_polled = server->connections_used;
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for ( size_t i = 0; i < connections_polled; i++ )
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{
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struct pollfd* pfd = &pfds[cpfd_off + i];
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struct connection* connection = server->connections[i];
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pfd->fd = connection->fd;
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pfd->events = connection_interested_poll_events(connection);
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pfd->revents = 0;
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}
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size_t pfds_used = cpfd_off + connections_polled;
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int num_events = ppoll(pfds, pfds_used, NULL, NULL);
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if ( num_events < 0 )
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err(1, "poll");
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if ( pfds[0].revents )
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{
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// TODO: Handle if this can actually happen.
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assert(!(pfds[0].revents & POLLERR));
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assert(!(pfds[0].revents & POLLHUP));
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assert(!(pfds[0].revents & POLLNVAL));
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server_accept(server);
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}
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if ( pfds[1].revents )
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{
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// TODO: Handle if this can actually happen.
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assert(!(pfds[1].revents & POLLERR));
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assert(!(pfds[1].revents & POLLHUP));
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assert(!(pfds[1].revents & POLLNVAL));
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uint32_t codepoint;
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ssize_t size = sizeof(codepoint);
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while ( read(server->tty_fd, &codepoint, size) == size )
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display_keyboard_event(server->display, codepoint);
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}
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if ( pfds[2].revents )
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{
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// TODO: Handle if this can actually happen.
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assert(!(pfds[2].revents & POLLERR));
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assert(!(pfds[2].revents & POLLHUP));
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assert(!(pfds[2].revents & POLLNVAL));
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unsigned char events[64];
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ssize_t amount = read(server->mouse_fd, events, sizeof(events));
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for ( ssize_t i = 0; i < amount; i++ )
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display_mouse_event(server->display, events[i]);
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}
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bool any_disconnect = false;
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for ( size_t i = 0; i < connections_polled; i++ )
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{
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struct pollfd* pfd = &pfds[cpfd_off + i];
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if ( !pfd->revents )
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continue;
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struct connection* connection = server->connections[i];
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if ( pfd->revents & (POLLERR | POLLHUP | POLLNVAL) &&
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!(pfd->revents & POLLIN) )
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{
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connection_destroy(connection);
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free(connection);
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server->connections[i] = NULL;
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any_disconnect = true;
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continue;
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}
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if ( pfd->revents & POLLOUT )
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connection_can_write(connection);
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if ( pfd->revents & POLLIN )
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connection_can_read(connection);
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}
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// Compact the array down here so the pfds match the connections above.
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if ( any_disconnect )
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{
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size_t new_used = 0;
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for ( size_t i = 0; i < server->connections_used; i++ )
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{
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if ( server->connections[i] )
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server->connections[new_used++] = server->connections[i];
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}
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server->connections_used = new_used;
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}
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}
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void server_mainloop(struct server* server)
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{
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while ( true )
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{
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// TODO: Only do this if a redraw is actually needed.
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display_render(server->display);
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server_poll(server);
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}
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}
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