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window.c
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window.c
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/* $OpenBSD$ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* 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 <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <signal.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include "tmux.h"
/*
* Each window is attached to a number of panes, each of which is a pty. This
* file contains code to handle them.
*
* A pane has two buffers attached, these are filled and emptied by the main
* server poll loop. Output data is received from pty's in screen format,
* translated and returned as a series of escape sequences and strings via
* input_parse (in input.c). Input data is received as key codes and written
* directly via input_key.
*
* Each pane also has a "virtual" screen (screen.c) which contains the current
* state and is redisplayed when the window is reattached to a client.
*
* Windows are stored directly on a global array and wrapped in any number of
* winlink structs to be linked onto local session RB trees. A reference count
* is maintained and a window removed from the global list and destroyed when
* it reaches zero.
*/
/* Global window list. */
struct windows windows;
/* Global panes tree. */
struct window_pane_tree all_window_panes;
u_int next_window_pane_id;
u_int next_window_id;
u_int next_active_point;
void window_pane_timer_callback(int, short, void *);
void window_pane_read_callback(struct bufferevent *, void *);
void window_pane_error_callback(struct bufferevent *, short, void *);
struct window_pane *window_pane_choose_best(struct window_pane **, u_int);
static
int
window_cmp(struct window *w1, struct window *w2)
{
return (w1->id - w2->id);
}
RB_GENERATE(windows, window, entry, window_cmp);
static int
winlink_cmp(struct winlink *wl1, struct winlink *wl2)
{
return (wl1->idx - wl2->idx);
}
RB_GENERATE(winlinks, winlink, entry, winlink_cmp);
static int
window_pane_cmp(struct window_pane *wp1, struct window_pane *wp2)
{
return (wp1->id - wp2->id);
}
RB_GENERATE(window_pane_tree, window_pane, tree_entry, window_pane_cmp);
struct winlink *
winlink_find_by_window(struct winlinks *wwl, struct window *w)
{
struct winlink *wl;
RB_FOREACH(wl, winlinks, wwl) {
if (wl->window == w)
return (wl);
}
return (NULL);
}
struct winlink *
winlink_find_by_index(struct winlinks *wwl, int idx)
{
struct winlink wl;
if (idx < 0)
fatalx("bad index");
wl.idx = idx;
return (RB_FIND(winlinks, wwl, &wl));
}
struct winlink *
winlink_find_by_window_id(struct winlinks *wwl, u_int id)
{
struct winlink *wl;
RB_FOREACH(wl, winlinks, wwl) {
if (wl->window->id == id)
return (wl);
}
return (NULL);
}
int
winlink_next_index(struct winlinks *wwl, int idx)
{
int i;
i = idx;
do {
if (winlink_find_by_index(wwl, i) == NULL)
return (i);
if (i == INT_MAX)
i = 0;
else
i++;
} while (i != idx);
return (-1);
}
u_int
winlink_count(struct winlinks *wwl)
{
struct winlink *wl;
u_int n;
n = 0;
RB_FOREACH(wl, winlinks, wwl)
n++;
return (n);
}
struct winlink *
winlink_add(struct winlinks *wwl, int idx)
{
struct winlink *wl;
if (idx < 0) {
if ((idx = winlink_next_index(wwl, -idx - 1)) == -1)
return (NULL);
} else if (winlink_find_by_index(wwl, idx) != NULL)
return (NULL);
wl = xcalloc(1, sizeof *wl);
wl->idx = idx;
RB_INSERT(winlinks, wwl, wl);
return (wl);
}
void
winlink_set_window(struct winlink *wl, struct window *w)
{
wl->window = w;
w->references++;
}
void
winlink_remove(struct winlinks *wwl, struct winlink *wl)
{
struct window *w = wl->window;
RB_REMOVE(winlinks, wwl, wl);
free(wl->status_text);
free(wl);
if (w != NULL)
window_remove_ref(w);
}
struct winlink *
winlink_next(struct winlink *wl)
{
return (RB_NEXT(winlinks, wwl, wl));
}
struct winlink *
winlink_previous(struct winlink *wl)
{
return (RB_PREV(winlinks, wwl, wl));
}
struct winlink *
winlink_next_by_number(struct winlink *wl, struct session *s, int n)
{
for (; n > 0; n--) {
if ((wl = RB_NEXT(winlinks, wwl, wl)) == NULL)
wl = RB_MIN(winlinks, &s->windows);
}
return (wl);
}
struct winlink *
winlink_previous_by_number(struct winlink *wl, struct session *s, int n)
{
for (; n > 0; n--) {
if ((wl = RB_PREV(winlinks, wwl, wl)) == NULL)
wl = RB_MAX(winlinks, &s->windows);
}
return (wl);
}
void
winlink_stack_push(struct winlink_stack *stack, struct winlink *wl)
{
if (wl == NULL)
return;
winlink_stack_remove(stack, wl);
TAILQ_INSERT_HEAD(stack, wl, sentry);
}
void
winlink_stack_remove(struct winlink_stack *stack, struct winlink *wl)
{
struct winlink *wl2;
if (wl == NULL)
return;
TAILQ_FOREACH(wl2, stack, sentry) {
if (wl2 == wl) {
TAILQ_REMOVE(stack, wl, sentry);
return;
}
}
}
struct window *
window_find_by_id_str(const char *s)
{
const char *errstr;
u_int id;
if (*s != '@')
return (NULL);
id = strtonum(s + 1, 0, UINT_MAX, &errstr);
if (errstr != NULL)
return (NULL);
return (window_find_by_id(id));
}
struct window *
window_find_by_id(u_int id)
{
struct window w;
w.id = id;
return (RB_FIND(windows, &windows, &w));
}
void
window_update_activity(struct window *w)
{
gettimeofday(&w->activity_time, NULL);
alerts_queue(w, WINDOW_ACTIVITY);
}
struct window *
window_create1(u_int sx, u_int sy)
{
struct window *w;
w = xcalloc(1, sizeof *w);
w->name = NULL;
w->flags = 0;
TAILQ_INIT(&w->panes);
w->active = NULL;
w->lastlayout = -1;
w->layout_root = NULL;
w->sx = sx;
w->sy = sy;
w->options = options_create(global_w_options);
w->references = 0;
w->id = next_window_id++;
RB_INSERT(windows, &windows, w);
window_update_activity(w);
return (w);
}
struct window *
window_create(const char *name, int argc, char **argv, const char *path,
const char *shell, const char *cwd, struct environ *env,
struct termios *tio, u_int sx, u_int sy, u_int hlimit, char **cause)
{
struct window *w;
struct window_pane *wp;
w = window_create1(sx, sy);
wp = window_add_pane(w, hlimit);
layout_init(w, wp);
if (window_pane_spawn(wp, argc, argv, path, shell, cwd, env, tio,
cause) != 0) {
window_destroy(w);
return (NULL);
}
w->active = TAILQ_FIRST(&w->panes);
if (name != NULL) {
w->name = xstrdup(name);
options_set_number(w->options, "automatic-rename", 0);
} else
w->name = default_window_name(w);
return (w);
}
void
window_destroy(struct window *w)
{
RB_REMOVE(windows, &windows, w);
if (w->layout_root != NULL)
layout_free_cell(w->layout_root);
if (w->saved_layout_root != NULL)
layout_free_cell(w->saved_layout_root);
free(w->old_layout);
if (event_initialized(&w->name_event))
evtimer_del(&w->name_event);
if (event_initialized(&w->alerts_timer))
evtimer_del(&w->alerts_timer);
options_free(w->options);
window_destroy_panes(w);
free(w->name);
free(w);
}
void
window_remove_ref(struct window *w)
{
if (w->references == 0)
fatal("bad reference count");
w->references--;
if (w->references == 0)
window_destroy(w);
}
void
window_set_name(struct window *w, const char *new_name)
{
free(w->name);
w->name = xstrdup(new_name);
notify_window_renamed(w);
}
void
window_resize(struct window *w, u_int sx, u_int sy)
{
w->sx = sx;
w->sy = sy;
}
int
window_has_pane(struct window *w, struct window_pane *wp)
{
struct window_pane *wp1;
TAILQ_FOREACH(wp1, &w->panes, entry) {
if (wp1 == wp)
return (1);
}
return (0);
}
int
window_set_active_pane(struct window *w, struct window_pane *wp)
{
if (wp == w->active)
return (0);
w->last = w->active;
w->active = wp;
while (!window_pane_visible(w->active)) {
w->active = TAILQ_PREV(w->active, window_panes, entry);
if (w->active == NULL)
w->active = TAILQ_LAST(&w->panes, window_panes);
if (w->active == wp)
return (1);
}
w->active->active_point = next_active_point++;
w->active->flags |= PANE_CHANGED;
return (1);
}
void
window_redraw_active_switch(struct window *w, struct window_pane *wp)
{
const struct grid_cell *agc, *wgc;
if (wp == w->active)
return;
/*
* If window-style and window-active-style are the same, we don't need
* to redraw panes when switching active panes. Otherwise, if the
* active or inactive pane do not have a custom style, they will need
* to be redrawn.
*/
agc = options_get_style(w->options, "window-active-style");
wgc = options_get_style(w->options, "window-style");
if (style_equal(agc, wgc))
return;
if (style_equal(&grid_default_cell, &w->active->colgc))
w->active->flags |= PANE_REDRAW;
if (style_equal(&grid_default_cell, &wp->colgc))
wp->flags |= PANE_REDRAW;
}
struct window_pane *
window_get_active_at(struct window *w, u_int x, u_int y)
{
struct window_pane *wp;
TAILQ_FOREACH(wp, &w->panes, entry) {
if (!window_pane_visible(wp))
continue;
if (x < wp->xoff || x > wp->xoff + wp->sx)
continue;
if (y < wp->yoff || y > wp->yoff + wp->sy)
continue;
return (wp);
}
return (NULL);
}
struct window_pane *
window_find_string(struct window *w, const char *s)
{
u_int x, y;
x = w->sx / 2;
y = w->sy / 2;
if (strcasecmp(s, "top") == 0)
y = 0;
else if (strcasecmp(s, "bottom") == 0)
y = w->sy - 1;
else if (strcasecmp(s, "left") == 0)
x = 0;
else if (strcasecmp(s, "right") == 0)
x = w->sx - 1;
else if (strcasecmp(s, "top-left") == 0) {
x = 0;
y = 0;
} else if (strcasecmp(s, "top-right") == 0) {
x = w->sx - 1;
y = 0;
} else if (strcasecmp(s, "bottom-left") == 0) {
x = 0;
y = w->sy - 1;
} else if (strcasecmp(s, "bottom-right") == 0) {
x = w->sx - 1;
y = w->sy - 1;
} else
return (NULL);
return (window_get_active_at(w, x, y));
}
int
window_zoom(struct window_pane *wp)
{
struct window *w = wp->window;
struct window_pane *wp1;
if (w->flags & WINDOW_ZOOMED)
return (-1);
if (!window_pane_visible(wp))
return (-1);
if (window_count_panes(w) == 1)
return (-1);
if (w->active != wp)
window_set_active_pane(w, wp);
TAILQ_FOREACH(wp1, &w->panes, entry) {
wp1->saved_layout_cell = wp1->layout_cell;
wp1->layout_cell = NULL;
}
w->saved_layout_root = w->layout_root;
layout_init(w, wp);
w->flags |= WINDOW_ZOOMED;
notify_window_layout_changed(w);
return (0);
}
int
window_unzoom(struct window *w)
{
struct window_pane *wp;
if (!(w->flags & WINDOW_ZOOMED))
return (-1);
w->flags &= ~WINDOW_ZOOMED;
layout_free(w);
w->layout_root = w->saved_layout_root;
w->saved_layout_root = NULL;
TAILQ_FOREACH(wp, &w->panes, entry) {
wp->layout_cell = wp->saved_layout_cell;
wp->saved_layout_cell = NULL;
}
layout_fix_panes(w, w->sx, w->sy);
notify_window_layout_changed(w);
return (0);
}
struct window_pane *
window_add_pane(struct window *w, u_int hlimit)
{
struct window_pane *wp;
wp = window_pane_create(w, w->sx, w->sy, hlimit);
if (TAILQ_EMPTY(&w->panes))
TAILQ_INSERT_HEAD(&w->panes, wp, entry);
else
TAILQ_INSERT_AFTER(&w->panes, w->active, wp, entry);
return (wp);
}
void
window_lost_pane(struct window *w, struct window_pane *wp)
{
if (wp == marked_pane.wp)
server_clear_marked();
if (wp == w->active) {
w->active = w->last;
w->last = NULL;
if (w->active == NULL) {
w->active = TAILQ_PREV(wp, window_panes, entry);
if (w->active == NULL)
w->active = TAILQ_NEXT(wp, entry);
}
if (w->active != NULL)
w->active->flags |= PANE_CHANGED;
} else if (wp == w->last)
w->last = NULL;
}
void
window_remove_pane(struct window *w, struct window_pane *wp)
{
window_lost_pane(w, wp);
TAILQ_REMOVE(&w->panes, wp, entry);
window_pane_destroy(wp);
}
struct window_pane *
window_pane_at_index(struct window *w, u_int idx)
{
struct window_pane *wp;
u_int n;
n = options_get_number(w->options, "pane-base-index");
TAILQ_FOREACH(wp, &w->panes, entry) {
if (n == idx)
return (wp);
n++;
}
return (NULL);
}
struct window_pane *
window_pane_next_by_number(struct window *w, struct window_pane *wp, u_int n)
{
for (; n > 0; n--) {
if ((wp = TAILQ_NEXT(wp, entry)) == NULL)
wp = TAILQ_FIRST(&w->panes);
}
return (wp);
}
struct window_pane *
window_pane_previous_by_number(struct window *w, struct window_pane *wp,
u_int n)
{
for (; n > 0; n--) {
if ((wp = TAILQ_PREV(wp, window_panes, entry)) == NULL)
wp = TAILQ_LAST(&w->panes, window_panes);
}
return (wp);
}
int
window_pane_index(struct window_pane *wp, u_int *i)
{
struct window_pane *wq;
struct window *w = wp->window;
*i = options_get_number(w->options, "pane-base-index");
TAILQ_FOREACH(wq, &w->panes, entry) {
if (wp == wq) {
return (0);
}
(*i)++;
}
return (-1);
}
u_int
window_count_panes(struct window *w)
{
struct window_pane *wp;
u_int n;
n = 0;
TAILQ_FOREACH(wp, &w->panes, entry)
n++;
return (n);
}
void
window_destroy_panes(struct window *w)
{
struct window_pane *wp;
while (!TAILQ_EMPTY(&w->panes)) {
wp = TAILQ_FIRST(&w->panes);
TAILQ_REMOVE(&w->panes, wp, entry);
window_pane_destroy(wp);
}
}
/* Retuns the printable flags on a window, empty string if no flags set. */
char *
window_printable_flags(struct session *s, struct winlink *wl)
{
char flags[32];
int pos;
pos = 0;
if (wl->flags & WINLINK_ACTIVITY)
flags[pos++] = '#';
if (wl->flags & WINLINK_BELL)
flags[pos++] = '!';
if (wl->flags & WINLINK_SILENCE)
flags[pos++] = '~';
if (wl == s->curw)
flags[pos++] = '*';
if (wl == TAILQ_FIRST(&s->lastw))
flags[pos++] = '-';
if (server_check_marked() && wl == marked_pane.wl)
flags[pos++] = 'M';
if (wl->window->flags & WINDOW_ZOOMED)
flags[pos++] = 'Z';
flags[pos] = '\0';
return (xstrdup(flags));
}
struct window_pane *
window_pane_find_by_id_str(const char *s)
{
const char *errstr;
u_int id;
if (*s != '%')
return (NULL);
id = strtonum(s + 1, 0, UINT_MAX, &errstr);
if (errstr != NULL)
return (NULL);
return (window_pane_find_by_id(id));
}
struct window_pane *
window_pane_find_by_id(u_int id)
{
struct window_pane wp;
wp.id = id;
return (RB_FIND(window_pane_tree, &all_window_panes, &wp));
}
struct window_pane *
window_pane_create(struct window *w, u_int sx, u_int sy, u_int hlimit)
{
struct window_pane *wp;
char host[HOST_NAME_MAX + 1];
wp = xcalloc(1, sizeof *wp);
wp->window = w;
wp->id = next_window_pane_id++;
RB_INSERT(window_pane_tree, &all_window_panes, wp);
wp->argc = 0;
wp->argv = NULL;
wp->shell = NULL;
wp->cwd = NULL;
wp->fd = -1;
wp->event = NULL;
wp->mode = NULL;
wp->layout_cell = NULL;
wp->xoff = 0;
wp->yoff = 0;
wp->sx = sx;
wp->sy = sy;
wp->pipe_fd = -1;
wp->pipe_off = 0;
wp->pipe_event = NULL;
wp->saved_grid = NULL;
memcpy(&wp->colgc, &grid_default_cell, sizeof wp->colgc);
screen_init(&wp->base, sx, sy, hlimit);
wp->screen = &wp->base;
if (gethostname(host, sizeof host) == 0)
screen_set_title(&wp->base, host);
input_init(wp);
return (wp);
}
void
window_pane_destroy(struct window_pane *wp)
{
window_pane_reset_mode(wp);
if (event_initialized(&wp->timer))
evtimer_del(&wp->timer);
if (wp->fd != -1) {
#ifdef HAVE_UTEMPTER
utempter_remove_record(wp->fd);
#endif
bufferevent_free(wp->event);
close(wp->fd);
}
input_free(wp);
screen_free(&wp->base);
if (wp->saved_grid != NULL)
grid_destroy(wp->saved_grid);
if (wp->pipe_fd != -1) {
bufferevent_free(wp->pipe_event);
close(wp->pipe_fd);
}
RB_REMOVE(window_pane_tree, &all_window_panes, wp);
free((void *)wp->cwd);
free(wp->shell);
cmd_free_argv(wp->argc, wp->argv);
free(wp);
}
int
window_pane_spawn(struct window_pane *wp, int argc, char **argv,
const char *path, const char *shell, const char *cwd, struct environ *env,
struct termios *tio, char **cause)
{
struct winsize ws;
char *argv0, *cmd, **argvp;
const char *ptr, *first, *home;
struct termios tio2;
#ifdef HAVE_UTEMPTER
char s[32];
#endif
int i;
if (wp->fd != -1) {
bufferevent_free(wp->event);
close(wp->fd);
}
if (argc > 0) {
cmd_free_argv(wp->argc, wp->argv);
wp->argc = argc;
wp->argv = cmd_copy_argv(argc, argv);
}
if (shell != NULL) {
free(wp->shell);
wp->shell = xstrdup(shell);
}
if (cwd != NULL) {
free((void *)wp->cwd);
wp->cwd = xstrdup(cwd);
}
cmd = cmd_stringify_argv(wp->argc, wp->argv);
log_debug("spawn: %s -- %s", wp->shell, cmd);
for (i = 0; i < wp->argc; i++)
log_debug("spawn: argv[%d] = %s", i, wp->argv[i]);
memset(&ws, 0, sizeof ws);
ws.ws_col = screen_size_x(&wp->base);
ws.ws_row = screen_size_y(&wp->base);
switch (wp->pid = forkpty(&wp->fd, wp->tty, NULL, &ws)) {
case -1:
wp->fd = -1;
xasprintf(cause, "%s: %s", cmd, strerror(errno));
free(cmd);
return (-1);
case 0:
if (chdir(wp->cwd) != 0) {
if ((home = find_home()) == NULL || chdir(home) != 0)
chdir("/");
}
if (tcgetattr(STDIN_FILENO, &tio2) != 0)
fatal("tcgetattr failed");
if (tio != NULL)
memcpy(tio2.c_cc, tio->c_cc, sizeof tio2.c_cc);
tio2.c_cc[VERASE] = '\177';
#ifdef IUTF8
tio2.c_iflag |= IUTF8;
#endif
if (tcsetattr(STDIN_FILENO, TCSANOW, &tio2) != 0)
fatal("tcgetattr failed");
closefrom(STDERR_FILENO + 1);
if (path != NULL)
environ_set(env, "PATH", "%s", path);
environ_set(env, "TMUX_PANE", "%%%u", wp->id);
environ_push(env);
clear_signals(1);
log_close();
setenv("SHELL", wp->shell, 1);
ptr = strrchr(wp->shell, '/');
/*
* If given one argument, assume it should be passed to sh -c;
* with more than one argument, use execvp(). If there is no
* arguments, create a login shell.
*/
if (wp->argc > 0) {
if (wp->argc != 1) {
/* Copy to ensure argv ends in NULL. */
argvp = cmd_copy_argv(wp->argc, wp->argv);
execvp(argvp[0], argvp);
fatal("execvp failed");
}
first = wp->argv[0];
if (ptr != NULL && *(ptr + 1) != '\0')
xasprintf(&argv0, "%s", ptr + 1);
else
xasprintf(&argv0, "%s", wp->shell);
execl(wp->shell, argv0, "-c", first, (char *)NULL);
fatal("execl failed");
}
if (ptr != NULL && *(ptr + 1) != '\0')
xasprintf(&argv0, "-%s", ptr + 1);
else
xasprintf(&argv0, "-%s", wp->shell);
execl(wp->shell, argv0, (char *)NULL);
fatal("execl failed");
}
#ifdef HAVE_UTEMPTER
xsnprintf(s, sizeof s, "tmux(%lu).%%%u", (long) getpid(), wp->id);
utempter_add_record(wp->fd, s);
kill(getpid(), SIGCHLD);
#endif
setblocking(wp->fd, 0);
wp->event = bufferevent_new(wp->fd, window_pane_read_callback, NULL,
window_pane_error_callback, wp);
bufferevent_setwatermark(wp->event, EV_READ, 0, READ_SIZE);
bufferevent_enable(wp->event, EV_READ|EV_WRITE);
free(cmd);
return (0);
}
void
window_pane_timer_callback(__unused int fd, __unused short events, void *data)
{
window_pane_read_callback(NULL, data);
}
void
window_pane_read_callback(__unused struct bufferevent *bufev, void *data)
{
struct window_pane *wp = data;
struct evbuffer *evb = wp->event->input;
char *new_data;
size_t new_size, available;
struct client *c;
struct timeval tv;
if (event_initialized(&wp->timer))
evtimer_del(&wp->timer);
log_debug("%%%u has %zu bytes", wp->id, EVBUFFER_LENGTH(evb));
TAILQ_FOREACH(c, &clients, entry) {
if (!tty_client_ready(c, wp))
continue;
available = EVBUFFER_LENGTH(c->tty.event->output);
if (available > READ_BACKOFF)
goto start_timer;
}
new_size = EVBUFFER_LENGTH(evb) - wp->pipe_off;
if (wp->pipe_fd != -1 && new_size > 0) {
new_data = EVBUFFER_DATA(evb) + wp->pipe_off;
bufferevent_write(wp->pipe_event, new_data, new_size);
}
input_parse(wp);
wp->pipe_off = EVBUFFER_LENGTH(evb);
return;
start_timer:
log_debug("%%%u backing off (%s %zu > %d)", wp->id, c->ttyname,
available, READ_BACKOFF);
tv.tv_sec = 0;
tv.tv_usec = READ_TIME;
evtimer_set(&wp->timer, window_pane_timer_callback, wp);
evtimer_add(&wp->timer, &tv);
}
void
window_pane_error_callback(__unused struct bufferevent *bufev,
__unused short what, void *data)
{
struct window_pane *wp = data;
server_destroy_pane(wp, 1);
}
void
window_pane_resize(struct window_pane *wp, u_int sx, u_int sy)
{
if (sx == wp->sx && sy == wp->sy)
return;