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/* $Id: session.c 2579 2011-08-21 12:35:47Z tcunha $ */
/*
* 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/time.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include "tmux.h"
/* Global session list. */
struct sessions sessions;
struct sessions dead_sessions;
u_int next_session;
struct session_groups session_groups;
struct winlink *session_next_alert(struct winlink *);
struct winlink *session_previous_alert(struct winlink *);
RB_GENERATE(sessions, session, entry, session_cmp);
int
session_cmp(struct session *s1, struct session *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 index. */
struct session *
session_find_by_index(u_int idx)
{
struct session *s;
RB_FOREACH(s, sessions, &sessions) {
if (s->idx == idx)
return (s);
}
return (NULL);
}
/* Create a new session. */
struct session *
session_create(const char *name, const char *cmd, const char *cwd,
struct environ *env, struct termios *tio, int idx, u_int sx, u_int sy,
char **cause)
{
struct session *s;
s = xmalloc(sizeof *s);
s->references = 0;
s->flags = 0;
if (gettimeofday(&s->creation_time, NULL) != 0)
fatal("gettimeofday failed");
session_update_activity(s);
s->cwd = xstrdup(cwd);
s->curw = NULL;
TAILQ_INIT(&s->lastw);
RB_INIT(&s->windows);
options_init(&s->options, &global_s_options);
environ_init(&s->environ);
if (env != NULL)
environ_copy(env, &s->environ);
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->idx = next_session++;
} else {
s->name = NULL;
do {
s->idx = next_session++;
if (s->name != NULL)
xfree (s->name);
xasprintf(&s->name, "%u", s->idx);
} while (RB_FIND(sessions, &sessions, s) != NULL);
}
RB_INSERT(sessions, &sessions, s);
if (cmd != NULL) {
if (session_new(s, NULL, cmd, cwd, idx, cause) == NULL) {
session_destroy(s);
return (NULL);
}
session_select(s, RB_ROOT(&s->windows)->idx);
}
log_debug("session %s created", s->name);
return (s);
}
/* Destroy a session. */
void
session_destroy(struct session *s)
{
log_debug("session %s destroyed", s->name);
RB_REMOVE(sessions, &sessions, s);
if (s->tio != NULL)
xfree(s->tio);
session_group_remove(s);
environ_free(&s->environ);
options_free(&s->options);
while (!TAILQ_EMPTY(&s->lastw))
winlink_stack_remove(&s->lastw, TAILQ_FIRST(&s->lastw));
while (!RB_EMPTY(&s->windows))
winlink_remove(&s->windows, RB_ROOT(&s->windows));
xfree(s->cwd);
RB_INSERT(sessions, &dead_sessions, s);
}
/* Check a session name is valid: not empty and no colons. */
int
session_check_name(const char *name)
{
return (*name != '\0' && strchr(name, ':') == NULL);
}
/* Update session active time. */
void
session_update_activity(struct session *s)
{
if (gettimeofday(&s->activity_time, NULL) != 0)
fatal("gettimeofday");
}
/* 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, const char *cmd, 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);
}
environ_init(&env);
environ_copy(&global_environ, &env);
environ_copy(&s->environ, &env);
server_fill_environ(s, &env);
shell = options_get_string(&s->options, "default-shell");
if (*shell == '\0' || areshell(shell))
shell = _PATH_BSHELL;
hlimit = options_get_number(&s->options, "history-limit");
w = window_create(
name, cmd, 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);
if (options_get_number(&s->options, "set-remain-on-exit"))
options_set_number(&w->options, "remain-on-exit", 1);
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);
}
winlink_set_window(wl, 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;
winlink_stack_remove(&s->lastw, wl);
winlink_remove(&s->windows, wl);
session_group_synchronize_from(s);
if (RB_EMPTY(&s->windows)) {
session_destroy(s);
return (1);
}
return (0);
}
/* Return if session has window. */
struct winlink *
session_has(struct session *s, struct window *w)
{
struct winlink *wl;
RB_FOREACH(wl, winlinks, &s->windows) {
if (wl->window == w)
return (wl);
}
return (NULL);
}
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);
}
if (wl == s->curw)
return (1);
winlink_stack_remove(&s->lastw, wl);
winlink_stack_push(&s->lastw, s->curw);
s->curw = wl;
wl->flags &= ~WINLINK_ALERTFLAGS;
return (0);
}
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);
}
if (wl == s->curw)
return (1);
winlink_stack_remove(&s->lastw, wl);
winlink_stack_push(&s->lastw, s->curw);
s->curw = wl;
wl->flags &= ~WINLINK_ALERTFLAGS;
return (0);
}
/* Move session to specific window. */
int
session_select(struct session *s, int idx)
{
struct winlink *wl;
wl = winlink_find_by_index(&s->windows, idx);
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;
wl->flags &= ~WINLINK_ALERTFLAGS;
return (0);
}
/* 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);
winlink_stack_remove(&s->lastw, wl);
winlink_stack_push(&s->lastw, s->curw);
s->curw = wl;
wl->flags &= ~WINLINK_ALERTFLAGS;
return (0);
}
/* Find the session group containing a session. */
struct session_group *
session_group_find(struct session *target)
{
struct session_group *sg;
struct session *s;
TAILQ_FOREACH(sg, &session_groups, entry) {
TAILQ_FOREACH(s, &sg->sessions, gentry) {
if (s == target)
return (sg);
}
}
return (NULL);
}
/* Find session group index. */
u_int
session_group_index(struct session_group *sg)
{
struct session_group *sg2;
u_int i;
i = 0;
TAILQ_FOREACH(sg2, &session_groups, entry) {
if (sg == sg2)
return (i);
i++;
}
fatalx("session group not found");
}
/*
* Add a session to the session group containing target, creating it if
* necessary.
*/
void
session_group_add(struct session *target, struct session *s)
{
struct session_group *sg;
if ((sg = session_group_find(target)) == NULL) {
sg = xmalloc(sizeof *sg);
TAILQ_INSERT_TAIL(&session_groups, sg, entry);
TAILQ_INIT(&sg->sessions);
TAILQ_INSERT_TAIL(&sg->sessions, target, gentry);
}
TAILQ_INSERT_TAIL(&sg->sessions, s, gentry);
}
/* Remove a session from its group and destroy the group if empty. */
void
session_group_remove(struct session *s)
{
struct session_group *sg;
if ((sg = session_group_find(s)) == NULL)
return;
TAILQ_REMOVE(&sg->sessions, s, gentry);
if (TAILQ_NEXT(TAILQ_FIRST(&sg->sessions), gentry) == NULL)
TAILQ_REMOVE(&sg->sessions, TAILQ_FIRST(&sg->sessions), gentry);
if (TAILQ_EMPTY(&sg->sessions)) {
TAILQ_REMOVE(&session_groups, sg, entry);
xfree(sg);
}
}
/* 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_find(s)) == NULL)
return;
target = NULL;
TAILQ_FOREACH(target, &sg->sessions, gentry) {
if (target != s)
break;
}
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_find(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.
*/
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);
winlink_set_window(wl2, wl->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);
winlink_remove(&old_windows, wl);
}
}
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