tmux/session.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 <sys/time.h>
#include <paths.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include "tmux.h"
struct sessions sessions;
static u_int next_session_id;
struct session_groups session_groups;
static void session_free(int, short, void *);
static void session_lock_timer(int, short, void *);
static struct winlink *session_next_alert(struct winlink *);
static struct winlink *session_previous_alert(struct winlink *);
static void session_group_remove(struct session *);
static void session_group_synchronize1(struct session *, struct session *);
RB_GENERATE(sessions, session, entry, session_cmp);
int
session_cmp(struct session *s1, struct session *s2)
{
return (strcmp(s1->name, s2->name));
}
RB_GENERATE(session_groups, session_group, entry, session_group_cmp);
int
session_group_cmp(struct session_group *s1, struct session_group *s2)
{
return (strcmp(s1->name, s2->name));
}
/*
* Find if session is still alive. This is true if it is still on the global
* sessions list.
*/
int
session_alive(struct session *s)
{
struct session *s_loop;
RB_FOREACH(s_loop, sessions, &sessions) {
if (s_loop == s)
return (1);
}
return (0);
}
/* Find session by name. */
struct session *
session_find(const char *name)
{
struct session s;
s.name = (char *) name;
return (RB_FIND(sessions, &sessions, &s));
}
/* Find session by id parsed from a string. */
struct session *
session_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 (session_find_by_id(id));
}
/* Find session by id. */
struct session *
session_find_by_id(u_int id)
{
struct session *s;
RB_FOREACH(s, sessions, &sessions) {
if (s->id == id)
return (s);
}
return (NULL);
}
/* Create a new session. */
struct session *
session_create(const char *prefix, const char *name, int argc, char **argv,
const char *path, const char *cwd, struct environ *env, struct termios *tio,
int idx, u_int sx, u_int sy, char **cause)
{
struct session *s;
struct winlink *wl;
s = xcalloc(1, sizeof *s);
s->references = 1;
s->flags = 0;
s->cwd = xstrdup(cwd);
s->curw = NULL;
TAILQ_INIT(&s->lastw);
RB_INIT(&s->windows);
s->environ = environ_create();
if (env != NULL)
environ_copy(env, s->environ);
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s->options = options_create(global_s_options);
s->hooks = hooks_create(global_hooks);
status_update_saved(s);
s->tio = NULL;
if (tio != NULL) {
s->tio = xmalloc(sizeof *s->tio);
memcpy(s->tio, tio, sizeof *s->tio);
}
s->sx = sx;
s->sy = sy;
if (name != NULL) {
s->name = xstrdup(name);
s->id = next_session_id++;
} else {
s->name = NULL;
do {
s->id = next_session_id++;
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free(s->name);
if (prefix != NULL)
xasprintf(&s->name, "%s-%u", prefix, s->id);
else
xasprintf(&s->name, "%u", s->id);
} while (RB_FIND(sessions, &sessions, s) != NULL);
}
RB_INSERT(sessions, &sessions, s);
log_debug("new session %s $%u", s->name, s->id);
if (gettimeofday(&s->creation_time, NULL) != 0)
fatal("gettimeofday failed");
session_update_activity(s, &s->creation_time);
if (argc >= 0) {
wl = session_new(s, NULL, argc, argv, path, cwd, idx, cause);
if (wl == NULL) {
session_destroy(s, __func__);
return (NULL);
}
session_select(s, RB_ROOT(&s->windows)->idx);
}
log_debug("session %s created", s->name);
return (s);
}
/* Add a reference to a session. */
void
session_add_ref(struct session *s, const char *from)
{
s->references++;
log_debug("%s: %s %s, now %d", __func__, s->name, from, s->references);
}
/* Remove a reference from a session. */
void
session_remove_ref(struct session *s, const char *from)
{
s->references--;
log_debug("%s: %s %s, now %d", __func__, s->name, from, s->references);
if (s->references == 0)
event_once(-1, EV_TIMEOUT, session_free, s, NULL);
}
/* Free session. */
static void
session_free(__unused int fd, __unused short events, void *arg)
{
struct session *s = arg;
log_debug("session %s freed (%d references)", s->name, s->references);
if (s->references == 0) {
environ_free(s->environ);
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options_free(s->options);
hooks_free(s->hooks);
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free(s->name);
free(s);
}
}
/* Destroy a session. */
void
session_destroy(struct session *s, const char *from)
{
struct winlink *wl;
log_debug("session %s destroyed (%s)", s->name, from);
s->curw = NULL;
RB_REMOVE(sessions, &sessions, s);
notify_session("session-closed", s);
free(s->tio);
if (event_initialized(&s->lock_timer))
event_del(&s->lock_timer);
session_group_remove(s);
while (!TAILQ_EMPTY(&s->lastw))
winlink_stack_remove(&s->lastw, TAILQ_FIRST(&s->lastw));
while (!RB_EMPTY(&s->windows)) {
wl = RB_ROOT(&s->windows);
notify_session_window("window-unlinked", s, wl->window);
winlink_remove(&s->windows, wl);
}
free((void *)s->cwd);
session_remove_ref(s, __func__);
}
/* Check a session name is valid: not empty and no colons or periods. */
int
session_check_name(const char *name)
{
return (*name != '\0' && name[strcspn(name, ":.")] == '\0');
}
/* Lock session if it has timed out. */
static void
session_lock_timer(__unused int fd, __unused short events, void *arg)
{
struct session *s = arg;
if (s->flags & SESSION_UNATTACHED)
return;
log_debug("session %s locked, activity time %lld", s->name,
(long long)s->activity_time.tv_sec);
server_lock_session(s);
recalculate_sizes();
}
/* Update activity time. */
void
session_update_activity(struct session *s, struct timeval *from)
{
struct timeval *last = &s->last_activity_time;
struct timeval tv;
memcpy(last, &s->activity_time, sizeof *last);
if (from == NULL)
gettimeofday(&s->activity_time, NULL);
else
memcpy(&s->activity_time, from, sizeof s->activity_time);
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log_debug("session $%u %s activity %lld.%06d (last %lld.%06d)", s->id,
s->name, (long long)s->activity_time.tv_sec,
(int)s->activity_time.tv_usec, (long long)last->tv_sec,
(int)last->tv_usec);
if (evtimer_initialized(&s->lock_timer))
evtimer_del(&s->lock_timer);
else
evtimer_set(&s->lock_timer, session_lock_timer, s);
if (~s->flags & SESSION_UNATTACHED) {
timerclear(&tv);
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tv.tv_sec = options_get_number(s->options, "lock-after-time");
if (tv.tv_sec != 0)
evtimer_add(&s->lock_timer, &tv);
}
}
/* Find the next usable session. */
struct session *
session_next_session(struct session *s)
{
struct session *s2;
if (RB_EMPTY(&sessions) || !session_alive(s))
return (NULL);
s2 = RB_NEXT(sessions, &sessions, s);
if (s2 == NULL)
s2 = RB_MIN(sessions, &sessions);
if (s2 == s)
return (NULL);
return (s2);
}
/* Find the previous usable session. */
struct session *
session_previous_session(struct session *s)
{
struct session *s2;
if (RB_EMPTY(&sessions) || !session_alive(s))
return (NULL);
s2 = RB_PREV(sessions, &sessions, s);
if (s2 == NULL)
s2 = RB_MAX(sessions, &sessions);
if (s2 == s)
return (NULL);
return (s2);
}
/* Create a new window on a session. */
struct winlink *
session_new(struct session *s, const char *name, int argc, char **argv,
const char *path, const char *cwd, int idx, char **cause)
{
struct window *w;
struct winlink *wl;
struct environ *env;
const char *shell;
u_int hlimit;
if ((wl = winlink_add(&s->windows, idx)) == NULL) {
xasprintf(cause, "index in use: %d", idx);
return (NULL);
}
wl->session = s;
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shell = options_get_string(s->options, "default-shell");
if (*shell == '\0' || areshell(shell))
shell = _PATH_BSHELL;
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hlimit = options_get_number(s->options, "history-limit");
env = environ_for_session(s, 0);
w = window_create_spawn(name, argc, argv, path, shell, cwd, env, s->tio,
s->sx, s->sy, hlimit, cause);
if (w == NULL) {
winlink_remove(&s->windows, wl);
environ_free(env);
return (NULL);
}
winlink_set_window(wl, w);
environ_free(env);
notify_session_window("window-linked", s, w);
session_group_synchronize_from(s);
return (wl);
}
/* Attach a window to a session. */
struct winlink *
session_attach(struct session *s, struct window *w, int idx, char **cause)
{
struct winlink *wl;
if ((wl = winlink_add(&s->windows, idx)) == NULL) {
xasprintf(cause, "index in use: %d", idx);
return (NULL);
}
wl->session = s;
winlink_set_window(wl, w);
notify_session_window("window-linked", s, w);
session_group_synchronize_from(s);
return (wl);
}
/* Detach a window from a session. */
int
session_detach(struct session *s, struct winlink *wl)
{
if (s->curw == wl &&
session_last(s) != 0 &&
session_previous(s, 0) != 0)
session_next(s, 0);
wl->flags &= ~WINLINK_ALERTFLAGS;
notify_session_window("window-unlinked", s, wl->window);
winlink_stack_remove(&s->lastw, wl);
winlink_remove(&s->windows, wl);
session_group_synchronize_from(s);
if (RB_EMPTY(&s->windows)) {
session_destroy(s, __func__);
return (1);
}
return (0);
}
/* Return if session has window. */
int
session_has(struct session *s, struct window *w)
{
struct winlink *wl;
TAILQ_FOREACH(wl, &w->winlinks, wentry) {
if (wl->session == s)
return (1);
}
return (0);
}
/*
* Return 1 if a window is linked outside this session (not including session
* groups). The window must be in this session!
*/
int
session_is_linked(struct session *s, struct window *w)
{
struct session_group *sg;
if ((sg = session_group_contains(s)) != NULL)
return (w->references != session_group_count(sg));
return (w->references != 1);
}
static struct winlink *
session_next_alert(struct winlink *wl)
{
while (wl != NULL) {
if (wl->flags & WINLINK_ALERTFLAGS)
break;
wl = winlink_next(wl);
}
return (wl);
}
/* Move session to next window. */
int
session_next(struct session *s, int alert)
{
struct winlink *wl;
if (s->curw == NULL)
return (-1);
wl = winlink_next(s->curw);
if (alert)
wl = session_next_alert(wl);
if (wl == NULL) {
wl = RB_MIN(winlinks, &s->windows);
if (alert && ((wl = session_next_alert(wl)) == NULL))
return (-1);
}
return (session_set_current(s, wl));
}
static struct winlink *
session_previous_alert(struct winlink *wl)
{
while (wl != NULL) {
if (wl->flags & WINLINK_ALERTFLAGS)
break;
wl = winlink_previous(wl);
}
return (wl);
}
/* Move session to previous window. */
int
session_previous(struct session *s, int alert)
{
struct winlink *wl;
if (s->curw == NULL)
return (-1);
wl = winlink_previous(s->curw);
if (alert)
wl = session_previous_alert(wl);
if (wl == NULL) {
wl = RB_MAX(winlinks, &s->windows);
if (alert && (wl = session_previous_alert(wl)) == NULL)
return (-1);
}
return (session_set_current(s, wl));
}
/* Move session to specific window. */
int
session_select(struct session *s, int idx)
{
struct winlink *wl;
wl = winlink_find_by_index(&s->windows, idx);
return (session_set_current(s, wl));
}
/* Move session to last used window. */
int
session_last(struct session *s)
{
struct winlink *wl;
wl = TAILQ_FIRST(&s->lastw);
if (wl == NULL)
return (-1);
if (wl == s->curw)
return (1);
return (session_set_current(s, wl));
}
/* Set current winlink to wl .*/
int
session_set_current(struct session *s, struct winlink *wl)
{
if (wl == NULL)
return (-1);
if (wl == s->curw)
return (1);
winlink_stack_remove(&s->lastw, wl);
winlink_stack_push(&s->lastw, s->curw);
s->curw = wl;
winlink_clear_flags(wl);
window_update_activity(wl->window);
notify_session("session-window-changed", s);
return (0);
}
/* Find the session group containing a session. */
struct session_group *
session_group_contains(struct session *target)
{
struct session_group *sg;
struct session *s;
RB_FOREACH(sg, session_groups, &session_groups) {
TAILQ_FOREACH(s, &sg->sessions, gentry) {
if (s == target)
return (sg);
}
}
return (NULL);
}
/* Find session group by name. */
struct session_group *
session_group_find(const char *name)
{
struct session_group sg;
sg.name = name;
return (RB_FIND(session_groups, &session_groups, &sg));
}
/* Create a new session group. */
struct session_group *
session_group_new(const char *name)
{
struct session_group *sg;
if ((sg = session_group_find(name)) != NULL)
return (sg);
sg = xcalloc(1, sizeof *sg);
sg->name = xstrdup(name);
TAILQ_INIT(&sg->sessions);
RB_INSERT(session_groups, &session_groups, sg);
return (sg);
}
/* Add a session to a session group. */
void
session_group_add(struct session_group *sg, struct session *s)
{
if (session_group_contains(s) == NULL)
TAILQ_INSERT_TAIL(&sg->sessions, s, gentry);
}
/* Remove a session from its group and destroy the group if empty. */
static void
session_group_remove(struct session *s)
{
struct session_group *sg;
if ((sg = session_group_contains(s)) == NULL)
return;
TAILQ_REMOVE(&sg->sessions, s, gentry);
if (TAILQ_EMPTY(&sg->sessions)) {
RB_REMOVE(session_groups, &session_groups, sg);
free(sg);
}
}
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/* Count number of sessions in session group. */
u_int
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session_group_count(struct session_group *sg)
{
struct session *s;
u_int n;
n = 0;
TAILQ_FOREACH(s, &sg->sessions, gentry)
n++;
return (n);
}
/* Synchronize a session to its session group. */
void
session_group_synchronize_to(struct session *s)
{
struct session_group *sg;
struct session *target;
if ((sg = session_group_contains(s)) == NULL)
return;
target = NULL;
TAILQ_FOREACH(target, &sg->sessions, gentry) {
if (target != s)
break;
}
if (target != NULL)
session_group_synchronize1(target, s);
}
/* Synchronize a session group to a session. */
void
session_group_synchronize_from(struct session *target)
{
struct session_group *sg;
struct session *s;
if ((sg = session_group_contains(target)) == NULL)
return;
TAILQ_FOREACH(s, &sg->sessions, gentry) {
if (s != target)
session_group_synchronize1(target, s);
}
}
/*
* Synchronize a session with a target session. This means destroying all
* winlinks then recreating them, then updating the current window, last window
* stack and alerts.
*/
static void
session_group_synchronize1(struct session *target, struct session *s)
{
struct winlinks old_windows, *ww;
struct winlink_stack old_lastw;
struct winlink *wl, *wl2;
/* Don't do anything if the session is empty (it'll be destroyed). */
ww = &target->windows;
if (RB_EMPTY(ww))
return;
/* If the current window has vanished, move to the next now. */
if (s->curw != NULL &&
winlink_find_by_index(ww, s->curw->idx) == NULL &&
session_last(s) != 0 && session_previous(s, 0) != 0)
session_next(s, 0);
/* Save the old pointer and reset it. */
memcpy(&old_windows, &s->windows, sizeof old_windows);
RB_INIT(&s->windows);
/* Link all the windows from the target. */
RB_FOREACH(wl, winlinks, ww) {
wl2 = winlink_add(&s->windows, wl->idx);
wl2->session = s;
winlink_set_window(wl2, wl->window);
notify_session_window("window-linked", s, wl2->window);
wl2->flags |= wl->flags & WINLINK_ALERTFLAGS;
}
/* Fix up the current window. */
if (s->curw != NULL)
s->curw = winlink_find_by_index(&s->windows, s->curw->idx);
else
s->curw = winlink_find_by_index(&s->windows, target->curw->idx);
/* Fix up the last window stack. */
memcpy(&old_lastw, &s->lastw, sizeof old_lastw);
TAILQ_INIT(&s->lastw);
TAILQ_FOREACH(wl, &old_lastw, sentry) {
wl2 = winlink_find_by_index(&s->windows, wl->idx);
if (wl2 != NULL)
TAILQ_INSERT_TAIL(&s->lastw, wl2, sentry);
}
/* Then free the old winlinks list. */
while (!RB_EMPTY(&old_windows)) {
wl = RB_ROOT(&old_windows);
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wl2 = winlink_find_by_window_id(&s->windows, wl->window->id);
if (wl2 == NULL)
notify_session_window("window-unlinked", s, wl->window);
winlink_remove(&old_windows, wl);
}
}
/* Renumber the windows across winlinks attached to a specific session. */
void
session_renumber_windows(struct session *s)
{
struct winlink *wl, *wl1, *wl_new;
struct winlinks old_wins;
struct winlink_stack old_lastw;
int new_idx, new_curw_idx;
/* Save and replace old window list. */
memcpy(&old_wins, &s->windows, sizeof old_wins);
RB_INIT(&s->windows);
/* Start renumbering from the base-index if it's set. */
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new_idx = options_get_number(s->options, "base-index");
new_curw_idx = 0;
/* Go through the winlinks and assign new indexes. */
RB_FOREACH(wl, winlinks, &old_wins) {
wl_new = winlink_add(&s->windows, new_idx);
wl_new->session = s;
winlink_set_window(wl_new, wl->window);
wl_new->flags |= wl->flags & WINLINK_ALERTFLAGS;
if (wl == s->curw)
new_curw_idx = wl_new->idx;
new_idx++;
}
/* Fix the stack of last windows now. */
memcpy(&old_lastw, &s->lastw, sizeof old_lastw);
TAILQ_INIT(&s->lastw);
TAILQ_FOREACH(wl, &old_lastw, sentry) {
wl_new = winlink_find_by_window(&s->windows, wl->window);
if (wl_new != NULL)
TAILQ_INSERT_TAIL(&s->lastw, wl_new, sentry);
}
/* Set the current window. */
s->curw = winlink_find_by_index(&s->windows, new_curw_idx);
/* Free the old winlinks (reducing window references too). */
RB_FOREACH_SAFE(wl, winlinks, &old_wins, wl1)
winlink_remove(&old_wins, wl);
}