tmux/server.c

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2009-01-10 01:51:22 +00:00
/* $Id: server.c,v 1.91 2009-01-10 01:51:22 nicm Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#include "tmux.h"
/*
* Main server functions.
*/
/* Client list. */
struct clients clients;
int server_main(const char *, int);
void server_fill_windows(struct pollfd **);
void server_handle_windows(struct pollfd **);
void server_fill_clients(struct pollfd **);
void server_handle_clients(struct pollfd **);
struct client *server_accept_client(int);
void server_handle_client(struct client *);
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void server_handle_window(struct window *);
void server_lost_client(struct client *);
void server_lost_window(struct window *);
void server_check_redraw(struct client *);
void server_check_timers(struct client *);
int server_update_socket(const char *);
/* Fork new server. */
int
server_start(const char *path)
{
struct sockaddr_un sa;
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size_t size;
mode_t mask;
int n, fd, pair[2], mode;
char *cause;
u_char ch;
/* Make a little socketpair to wait for the server to be ready. */
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
fatal("socketpair failed");
switch (fork()) {
case -1:
fatal("fork failed");
case 0:
break;
default:
close(pair[1]);
ch = 0x00;
if (read(pair[0], &ch, 1) == 1 && ch == 0xff) {
close(pair[0]);
return (0);
}
ch = 0x00;
if (write(pair[1], &ch, 1) != 1)
fatal("write failed");
close(pair[0]);
return (1);
}
close(pair[0]);
#ifdef DEBUG
xmalloc_clear();
#endif
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/*
* Must daemonise before loading configuration as the PID changes so
* $TMUX would be wrong for sessions created in the config file.
*/
if (daemon(1, 1) != 0)
fatal("daemon failed");
ARRAY_INIT(&windows);
ARRAY_INIT(&clients);
ARRAY_INIT(&sessions);
key_bindings_init();
if (cfg_file != NULL && load_cfg(cfg_file, &cause) != 0) {
log_warnx("%s", cause);
exit(1);
}
logfile("server");
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#ifndef NO_SETPROCTITLE
setproctitle("server (%s)", path);
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#endif
log_debug("server started, pid %ld", (long) getpid());
start_time = time(NULL);
socket_path = path;
memset(&sa, 0, sizeof sa);
sa.sun_family = AF_UNIX;
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size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
if (size >= sizeof sa.sun_path) {
errno = ENAMETOOLONG;
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fatal("socket failed");
}
unlink(sa.sun_path);
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
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fatal("socket failed");
mask = umask(S_IXUSR|S_IRWXG|S_IRWXO);
if (bind(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1)
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fatal("bind failed");
umask(mask);
if (listen(fd, 16) == -1)
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fatal("listen failed");
if ((mode = fcntl(fd, F_GETFL)) == -1)
fatal("fcntl failed");
if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
fatal("fcntl failed");
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if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
fatal("fcntl failed");
ch = 0xff;
if (write(pair[1], &ch, 1) != 1)
fatal("write failed");
read(pair[1], &ch, 1); /* Ignore errors; just to wait before closing. */
close(pair[1]);
n = server_main(path, fd);
#ifdef DEBUG
xmalloc_report(getpid(), "server");
#endif
exit(n);
}
/* Main server loop. */
int
server_main(const char *srv_path, int srv_fd)
{
struct pollfd *pfds, *pfd;
int nfds, xtimeout;
u_int i, n;
siginit();
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pfds = NULL;
while (!sigterm) {
/* Initialise pollfd array. */
nfds = 1 + ARRAY_LENGTH(&windows) + ARRAY_LENGTH(&clients) * 2;
pfds = xrealloc(pfds, nfds, sizeof *pfds);
pfd = pfds;
/* Fill server socket. */
pfd->fd = srv_fd;
pfd->events = POLLIN;
pfd++;
/* Fill window and client sockets. */
server_fill_windows(&pfd);
server_fill_clients(&pfd);
/* Update socket permissions. */
xtimeout = INFTIM;
if (server_update_socket(srv_path) != 0)
xtimeout = 100;
/* Do the poll. */
if ((nfds = poll(pfds, nfds, xtimeout)) == -1) {
if (errno == EAGAIN || errno == EINTR)
continue;
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fatal("poll failed");
}
pfd = pfds;
/* Handle server socket. */
#ifndef BROKEN_POLL
if (pfd->revents & (POLLERR|POLLNVAL|POLLHUP))
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fatalx("lost server socket");
#endif
if (pfd->revents & POLLIN) {
server_accept_client(srv_fd);
continue;
}
pfd++;
/*
* Handle window and client sockets. Clients can create
* windows, so windows must come first to avoid messing up by
* increasing the array size.
*/
server_handle_windows(&pfd);
server_handle_clients(&pfd);
/*
* If we have no sessions and clients left, let's get out
* of here...
*/
n = 0;
for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
if (ARRAY_ITEM(&sessions, i) != NULL)
n++;
}
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
if (ARRAY_ITEM(&clients, i) != NULL)
n++;
}
if (n == 0)
break;
}
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if (pfds != NULL)
xfree(pfds);
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for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
if (ARRAY_ITEM(&sessions, i) != NULL)
session_destroy(ARRAY_ITEM(&sessions, i));
}
ARRAY_FREE(&sessions);
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
if (ARRAY_ITEM(&clients, i) != NULL)
server_lost_client(ARRAY_ITEM(&clients, i));
}
ARRAY_FREE(&clients);
key_bindings_free();
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close(srv_fd);
unlink(srv_path);
return (0);
}
/* Fill window pollfds. */
void
server_fill_windows(struct pollfd **pfd)
{
struct window *w;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
if ((w = ARRAY_ITEM(&windows, i)) == NULL || w->fd == -1)
(*pfd)->fd = -1;
else {
(*pfd)->fd = w->fd;
(*pfd)->events = POLLIN;
if (BUFFER_USED(w->out) > 0)
(*pfd)->events |= POLLOUT;
}
(*pfd)++;
}
}
/* Handle window pollfds. */
void
server_handle_windows(struct pollfd **pfd)
{
struct window *w;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
if ((w = ARRAY_ITEM(&windows, i)) != NULL && w->fd != -1) {
if (buffer_poll(*pfd, w->in, w->out) != 0)
server_lost_window(w);
else
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server_handle_window(w);
}
(*pfd)++;
}
}
/* Check for general redraw on client. */
void
server_check_redraw(struct client *c)
{
struct session *s;
struct screen_redraw_ctx ctx;
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struct screen screen;
struct grid_cell gc;
u_int xx, yy, sx, sy;
char *title;
int flags;
if (c == NULL || c->session == NULL)
return;
s = c->session;
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flags = c->tty.flags & TTY_FREEZE;
c->tty.flags &= ~TTY_FREEZE;
if (options_get_number(&s->options, "set-titles")) {
title = s->curw->window->base.title;
if (c->title == NULL || strcmp(title, c->title) != 0) {
if (c->title != NULL)
xfree(c->title);
c->title = xstrdup(title);
tty_set_title(&c->tty, c->title);
}
}
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xx = c->sx;
yy = c->sy - 1;
if (c->flags & CLIENT_REDRAW) {
sx = screen_size_x(s->curw->window->screen);
sy = screen_size_y(s->curw->window->screen);
if (sx < xx || sy < yy) {
/*
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* Fake up a blank(ish) screen and use it to draw the
* empty regions. NOTE: because this uses
* tty_write_client but doesn't write the client's
* screen, this can't use anything which relies on
* cursor position.
*/
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screen_init(&screen, xx, yy, 0);
screen_redraw_start(&ctx, &screen, tty_write_client, c);
if (sx < xx)
screen_redraw_columns(&ctx, sx, xx - sx);
if (sy < yy) {
memcpy(&gc, &grid_default_cell, sizeof gc);
gc.data = '-';
grid_view_fill(screen.grid, &gc, 0, sy, xx, 1);
screen_redraw_lines(&ctx, sy, yy - sy);
}
screen_redraw_stop(&ctx);
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screen_free(&screen);
}
screen_redraw_start_client(&ctx, c);
screen_redraw_lines(&ctx, 0, screen_size_y(ctx.s));
screen_redraw_stop(&ctx);
c->flags |= CLIENT_STATUS;
}
if (c->flags & CLIENT_STATUS) {
if (c->message_string != NULL)
status_message_redraw(c);
else if (c->prompt_string != NULL)
status_prompt_redraw(c);
else
status_redraw(c);
}
c->tty.flags |= flags;
c->flags &= ~(CLIENT_REDRAW|CLIENT_STATUS);
}
/* Check for timers on client. */
void
server_check_timers(struct client *c)
{
struct session *s;
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struct timeval tv;
u_int interval;
if (c == NULL || c->session == NULL)
return;
s = c->session;
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if (gettimeofday(&tv, NULL) != 0)
fatal("gettimeofday");
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if (c->message_string != NULL && timercmp(&tv, &c->message_timer, >))
server_clear_client_message(c);
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if (c->message_string != NULL || c->prompt_string != NULL) {
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/*
* Don't need timed redraw for messages/prompts so bail now.
* The status timer isn't reset when they are redrawn anyway.
*/
return;
}
if (!options_get_number(&s->options, "status"))
return;
interval = options_get_number(&s->options, "status-interval");
if (interval == 0)
return;
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tv.tv_sec -= interval;
if (timercmp(&c->status_timer, &tv, <))
c->flags |= CLIENT_STATUS;
}
/* Fill client pollfds. */
void
server_fill_clients(struct pollfd **pfd)
{
struct client *c;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
server_check_timers(c);
server_check_redraw(c);
if (c == NULL)
(*pfd)->fd = -1;
else {
(*pfd)->fd = c->fd;
(*pfd)->events = POLLIN;
if (BUFFER_USED(c->out) > 0)
(*pfd)->events |= POLLOUT;
}
(*pfd)++;
if (c == NULL || c->tty.fd == -1 || c->session == NULL)
(*pfd)->fd = -1;
else {
(*pfd)->fd = c->tty.fd;
(*pfd)->events = POLLIN;
if (BUFFER_USED(c->tty.out) > 0)
(*pfd)->events |= POLLOUT;
}
(*pfd)++;
}
}
/* Handle client pollfds. */
void
server_handle_clients(struct pollfd **pfd)
{
struct client *c;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
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if (c != NULL) {
if (buffer_poll(*pfd, c->in, c->out) != 0) {
server_lost_client(c);
(*pfd) += 2;
continue;
} else
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server_msg_dispatch(c);
}
(*pfd)++;
if (c != NULL && c->tty.fd != -1 && c->session != NULL) {
if (buffer_poll(*pfd, c->tty.in, c->tty.out) != 0)
server_lost_client(c);
else
server_handle_client(c);
}
(*pfd)++;
}
}
/* accept(2) and create new client. */
struct client *
server_accept_client(int srv_fd)
{
struct client *c;
struct sockaddr_storage sa;
socklen_t slen = sizeof sa;
int client_fd, mode;
u_int i;
client_fd = accept(srv_fd, (struct sockaddr *) &sa, &slen);
if (client_fd == -1) {
if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
return (NULL);
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fatal("accept failed");
}
if ((mode = fcntl(client_fd, F_GETFL)) == -1)
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fatal("fcntl failed");
if (fcntl(client_fd, F_SETFL, mode|O_NONBLOCK) == -1)
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fatal("fcntl failed");
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c = xcalloc(1, sizeof *c);
c->fd = client_fd;
c->in = buffer_create(BUFSIZ);
c->out = buffer_create(BUFSIZ);
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ARRAY_INIT(&c->prompt_hdata);
c->tty.fd = -1;
c->title = NULL;
c->session = NULL;
c->sx = 80;
c->sy = 25;
c->message_string = NULL;
c->prompt_string = NULL;
c->prompt_buffer = NULL;
c->prompt_index = 0;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
if (ARRAY_ITEM(&clients, i) == NULL) {
ARRAY_SET(&clients, i, c);
return (c);
}
}
ARRAY_ADD(&clients, c);
return (c);
}
/* Input data from client. */
void
server_handle_client(struct client *c)
{
struct window *w = c->session->curw->window;
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int key, prefix;
prefix = options_get_number(&c->session->options, "prefix");
while (tty_keys_next(&c->tty, &key) == 0) {
server_clear_client_message(c);
if (c->prompt_string != NULL) {
status_prompt_key(c, key);
continue;
}
if (c->flags & CLIENT_PREFIX) {
key_bindings_dispatch(key, c);
c->flags &= ~CLIENT_PREFIX;
continue;
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} else if (key == prefix)
c->flags |= CLIENT_PREFIX;
else
window_key(w, c, key);
}
}
/* Lost a client. */
void
server_lost_client(struct client *c)
{
u_int i;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
if (ARRAY_ITEM(&clients, i) == c)
ARRAY_SET(&clients, i, NULL);
}
tty_free(&c->tty);
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if (c->title != NULL)
xfree(c->title);
if (c->message_string != NULL)
xfree(c->message_string);
if (c->prompt_string != NULL)
xfree(c->prompt_string);
if (c->prompt_buffer != NULL)
xfree(c->prompt_buffer);
for (i = 0; i < ARRAY_LENGTH(&c->prompt_hdata); i++)
xfree(ARRAY_ITEM(&c->prompt_hdata, i));
ARRAY_FREE(&c->prompt_hdata);
close(c->fd);
buffer_destroy(c->in);
buffer_destroy(c->out);
xfree(c);
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recalculate_sizes();
}
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/* Handle window data. */
void
server_handle_window(struct window *w)
{
struct session *s;
u_int i;
int action, update;
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window_parse(w);
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if (!(w->flags & WINDOW_BELL) && !(w->flags & WINDOW_ACTIVITY))
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return;
update = 0;
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for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
s = ARRAY_ITEM(&sessions, i);
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if (s == NULL || !session_has(s, w))
continue;
if (w->flags & WINDOW_BELL &&
!session_alert_has_window(s, w, WINDOW_BELL)) {
session_alert_add(s, w, WINDOW_BELL);
action = options_get_number(&s->options, "bell-action");
switch (action) {
case BELL_ANY:
tty_write_session(s, TTY_BELL);
break;
case BELL_CURRENT:
if (s->curw->window != w)
break;
tty_write_session(s, TTY_BELL);
break;
}
update = 1;
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}
if (options_get_number(&w->options, "monitor-activity") &&
(w->flags & WINDOW_ACTIVITY) &&
!session_alert_has_window(s, w, WINDOW_ACTIVITY)) {
session_alert_add(s, w, WINDOW_ACTIVITY);
update = 1;
}
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}
if (update)
server_status_window(w);
w->flags &= ~(WINDOW_BELL|WINDOW_ACTIVITY);
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}
/* Lost window: move clients on to next window. */
void
server_lost_window(struct window *w)
{
struct client *c;
struct session *s;
struct winlink *wl;
u_int i, j;
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int destroyed;
log_debug("lost window %d", w->fd);
if (options_get_number(&w->options, "remain-on-exit")) {
w->fd = -1;
return;
}
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for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
s = ARRAY_ITEM(&sessions, i);
if (s == NULL)
continue;
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if (!session_has(s, w))
continue;
restart:
/* Detach window and either redraw or kill clients. */
RB_FOREACH(wl, winlinks, &s->windows) {
if (wl->window != w)
continue;
destroyed = session_detach(s, wl);
for (j = 0; j < ARRAY_LENGTH(&clients); j++) {
c = ARRAY_ITEM(&clients, j);
if (c == NULL || c->session != s)
continue;
if (!destroyed) {
server_redraw_client(c);
continue;
}
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c->session = NULL;
server_write_client(c, MSG_EXIT, NULL, 0);
}
/* If the session was destroyed, bail now. */
if (destroyed)
break;
goto restart;
}
}
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recalculate_sizes();
}
int
server_update_socket(const char *path)
{
struct session *s;
u_int i;
static int last = -1;
int n;
n = 0;
for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
s = ARRAY_ITEM(&sessions, i);
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if (s != NULL && !(s->flags & SESSION_UNATTACHED)) {
n++;
break;
}
}
if (n != last) {
last = n;
if (n != 0)
chmod(path, S_IRWXU);
else
chmod(path, S_IRUSR|S_IWUSR);
}
return (n);
}