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Rewrite the code for reading and writing files. Now, if the client is
not attached, the server process asks it to open the file, similar to
how works for stdin, stdout, stderr. This makes special files like
/dev/fd/X work (used by some shells). stdin, stdout and stderr and
control mode are now just special cases of the same mechanism. This will
also make it easier to use for other commands that read files such as
source-file.

/* $OpenBSD: server-fn.c,v 1.123 2019/12/12 11:39:56 nicm Exp $ */

/*
 * 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/queue.h>
#include <sys/wait.h>
#include <sys/uio.h>

#include <imsg.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "tmux.h"

static struct session	*server_next_session(struct session *);
static void		 server_destroy_session_group(struct session *);

void
server_redraw_client(struct client *c)
{
	c->flags |= CLIENT_ALLREDRAWFLAGS;
}

void
server_status_client(struct client *c)
{
	c->flags |= CLIENT_REDRAWSTATUS;
}

void
server_redraw_session(struct session *s)
{
	struct client	*c;

	TAILQ_FOREACH(c, &clients, entry) {
		if (c->session == s)
			server_redraw_client(c);
	}
}

void
server_redraw_session_group(struct session *s)
{
	struct session_group	*sg;

	if ((sg = session_group_contains(s)) == NULL)
		server_redraw_session(s);
	else {
		TAILQ_FOREACH(s, &sg->sessions, gentry)
			server_redraw_session(s);
	}
}

void
server_status_session(struct session *s)
{
	struct client	*c;

	TAILQ_FOREACH(c, &clients, entry) {
		if (c->session == s)
			server_status_client(c);
	}
}

void
server_status_session_group(struct session *s)
{
	struct session_group	*sg;

	if ((sg = session_group_contains(s)) == NULL)
		server_status_session(s);
	else {
		TAILQ_FOREACH(s, &sg->sessions, gentry)
			server_status_session(s);
	}
}

void
server_redraw_window(struct window *w)
{
	struct client	*c;

	TAILQ_FOREACH(c, &clients, entry) {
		if (c->session != NULL && c->session->curw->window == w)
			server_redraw_client(c);
	}
}

void
server_redraw_window_borders(struct window *w)
{
	struct client	*c;

	TAILQ_FOREACH(c, &clients, entry) {
		if (c->session != NULL && c->session->curw->window == w)
			c->flags |= CLIENT_REDRAWBORDERS;
	}
}

void
server_status_window(struct window *w)
{
	struct session	*s;

	/*
	 * This is slightly different. We want to redraw the status line of any
	 * clients containing this window rather than anywhere it is the
	 * current window.
	 */

	RB_FOREACH(s, sessions, &sessions) {
		if (session_has(s, w))
			server_status_session(s);
	}
}

void
server_lock(void)
{
	struct client	*c;

	TAILQ_FOREACH(c, &clients, entry) {
		if (c->session != NULL)
			server_lock_client(c);
	}
}

void
server_lock_session(struct session *s)
{
	struct client	*c;

	TAILQ_FOREACH(c, &clients, entry) {
		if (c->session == s)
			server_lock_client(c);
	}
}

void
server_lock_client(struct client *c)
{
	const char	*cmd;

	if (c->flags & CLIENT_CONTROL)
		return;

	if (c->flags & CLIENT_SUSPENDED)
		return;

	cmd = options_get_string(c->session->options, "lock-command");
	if (*cmd == '\0' || strlen(cmd) + 1 > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
		return;

	tty_stop_tty(&c->tty);
	tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_SMCUP));
	tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_CLEAR));
	tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_E3));

	c->flags |= CLIENT_SUSPENDED;
	proc_send(c->peer, MSG_LOCK, -1, cmd, strlen(cmd) + 1);
}

void
server_kill_pane(struct window_pane *wp)
{
	struct window	*w = wp->window;

	if (window_count_panes(w) == 1) {
		server_kill_window(w);
		recalculate_sizes();
	} else {
		server_unzoom_window(w);
		layout_close_pane(wp);
		window_remove_pane(w, wp);
		server_redraw_window(w);
	}
}

void
server_kill_window(struct window *w)
{
	struct session		*s, *next_s, *target_s;
	struct session_group	*sg;
	struct winlink		*wl;

	next_s = RB_MIN(sessions, &sessions);
	while (next_s != NULL) {
		s = next_s;
		next_s = RB_NEXT(sessions, &sessions, s);

		if (!session_has(s, w))
			continue;
		server_unzoom_window(w);
		while ((wl = winlink_find_by_window(&s->windows, w)) != NULL) {
			if (session_detach(s, wl)) {
				server_destroy_session_group(s);
				break;
			} else
				server_redraw_session_group(s);
		}

		if (options_get_number(s->options, "renumber-windows")) {
			if ((sg = session_group_contains(s)) != NULL) {
				TAILQ_FOREACH(target_s, &sg->sessions, gentry)
					session_renumber_windows(target_s);
			} else
				session_renumber_windows(s);
		}
	}
	recalculate_sizes();
}

int
server_link_window(struct session *src, struct winlink *srcwl,
    struct session *dst, int dstidx, int killflag, int selectflag,
    char **cause)
{
	struct winlink		*dstwl;
	struct session_group	*srcsg, *dstsg;

	srcsg = session_group_contains(src);
	dstsg = session_group_contains(dst);
	if (src != dst && srcsg != NULL && dstsg != NULL && srcsg == dstsg) {
		xasprintf(cause, "sessions are grouped");
		return (-1);
	}

	dstwl = NULL;
	if (dstidx != -1)
		dstwl = winlink_find_by_index(&dst->windows, dstidx);
	if (dstwl != NULL) {
		if (dstwl->window == srcwl->window) {
			xasprintf(cause, "same index: %d", dstidx);
			return (-1);
		}
		if (killflag) {
			/*
			 * Can't use session_detach as it will destroy session
			 * if this makes it empty.
			 */
			notify_session_window("window-unlinked", dst,
			    dstwl->window);
			dstwl->flags &= ~WINLINK_ALERTFLAGS;
			winlink_stack_remove(&dst->lastw, dstwl);
			winlink_remove(&dst->windows, dstwl);

			/* Force select/redraw if current. */
			if (dstwl == dst->curw) {
				selectflag = 1;
				dst->curw = NULL;
			}
		}
	}

	if (dstidx == -1)
		dstidx = -1 - options_get_number(dst->options, "base-index");
	dstwl = session_attach(dst, srcwl->window, dstidx, cause);
	if (dstwl == NULL)
		return (-1);

	if (selectflag)
		session_select(dst, dstwl->idx);
	server_redraw_session_group(dst);

	return (0);
}

void
server_unlink_window(struct session *s, struct winlink *wl)
{
	if (session_detach(s, wl))
		server_destroy_session_group(s);
	else
		server_redraw_session_group(s);
}

void
server_destroy_pane(struct window_pane *wp, int notify)
{
	struct window		*w = wp->window;
	struct screen_write_ctx	 ctx;
	struct grid_cell	 gc;
	time_t			 t;
	char			 tim[26];

	if (wp->fd != -1) {
		bufferevent_free(wp->event);
		wp->event = NULL;
		close(wp->fd);
		wp->fd = -1;
	}

	if (options_get_number(wp->options, "remain-on-exit")) {
		if (~wp->flags & PANE_STATUSREADY)
			return;

		if (wp->flags & PANE_STATUSDRAWN)
			return;
		wp->flags |= PANE_STATUSDRAWN;

		if (notify)
			notify_pane("pane-died", wp);

		screen_write_start(&ctx, wp, &wp->base);
		screen_write_scrollregion(&ctx, 0, screen_size_y(ctx.s) - 1);
		screen_write_cursormove(&ctx, 0, screen_size_y(ctx.s) - 1, 0);
		screen_write_linefeed(&ctx, 1, 8);
		memcpy(&gc, &grid_default_cell, sizeof gc);

		time(&t);
		ctime_r(&t, tim);

		if (WIFEXITED(wp->status)) {
			screen_write_nputs(&ctx, -1, &gc,
			    "Pane is dead (status %d, %s)",
			    WEXITSTATUS(wp->status),
			    tim);
		} else if (WIFSIGNALED(wp->status)) {
			screen_write_nputs(&ctx, -1, &gc,
			    "Pane is dead (signal %d, %s)",
			    WTERMSIG(wp->status),
			    tim);
		}

		screen_write_stop(&ctx);
		wp->flags |= PANE_REDRAW;
		return;
	}

	if (notify)
		notify_pane("pane-exited", wp);

	server_unzoom_window(w);
	layout_close_pane(wp);
	window_remove_pane(w, wp);

	if (TAILQ_EMPTY(&w->panes))
		server_kill_window(w);
	else
		server_redraw_window(w);
}

static void
server_destroy_session_group(struct session *s)
{
	struct session_group	*sg;
	struct session		*s1;

	if ((sg = session_group_contains(s)) == NULL)
		server_destroy_session(s);
	else {
		TAILQ_FOREACH_SAFE(s, &sg->sessions, gentry, s1) {
			server_destroy_session(s);
			session_destroy(s, 1, __func__);
		}
	}
}

static struct session *
server_next_session(struct session *s)
{
	struct session *s_loop, *s_out;

	s_out = NULL;
	RB_FOREACH(s_loop, sessions, &sessions) {
		if (s_loop == s)
			continue;
		if (s_out == NULL ||
		    timercmp(&s_loop->activity_time, &s_out->activity_time, <))
			s_out = s_loop;
	}
	return (s_out);
}

void
server_destroy_session(struct session *s)
{
	struct client	*c;
	struct session	*s_new;

	if (!options_get_number(s->options, "detach-on-destroy"))
		s_new = server_next_session(s);
	else
		s_new = NULL;

	TAILQ_FOREACH(c, &clients, entry) {
		if (c->session != s)
			continue;
		if (s_new == NULL) {
			c->session = NULL;
			c->flags |= CLIENT_EXIT;
		} else {
			c->last_session = NULL;
			c->session = s_new;
			server_client_set_key_table(c, NULL);
			tty_update_client_offset(c);
			status_timer_start(c);
			notify_client("client-session-changed", c);
			session_update_activity(s_new, NULL);
			gettimeofday(&s_new->last_attached_time, NULL);
			server_redraw_client(c);
			alerts_check_session(s_new);
		}
	}
	recalculate_sizes();
}

void
server_check_unattached(void)
{
	struct session	*s;

	/*
	 * If any sessions are no longer attached and have destroy-unattached
	 * set, collect them.
	 */
	RB_FOREACH(s, sessions, &sessions) {
		if (s->attached != 0)
			continue;
		if (options_get_number (s->options, "destroy-unattached"))
			session_destroy(s, 1, __func__);
	}
}

void
server_unzoom_window(struct window *w)
{
	if (window_unzoom(w) == 0)
		server_redraw_window(w);
}