window.c - tmux - Rivoreo Source Code Repositories

 /* $Id: window.c,v 1.43 2008-06-18 20:11:25 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 <fcntl.h>
 #include <signal.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <termios.h>
 #include <unistd.h>

 #ifndef NO_PATHS_H
 #include <paths.h>
 #endif

 #ifdef USE_LIBUTIL_H
 #include <libutil.h>
 #else
 #ifdef USE_PTY_H
 #include <pty.h>
 #else
 #ifndef NO_FORKPTY
 #include <util.h>
 #endif
 #endif
 #endif

 #include "tmux.h"

 /*
  * Each window is attached to a pty. This file contains code to handle them.
  *
  * A window 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 window 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;

 RB_GENERATE(winlinks, winlink, entry, winlink_cmp);

 int
 winlink_cmp(struct winlink *wl1, struct winlink *wl2)
 {
 	return (wl1->idx - wl2->idx);
 }

 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));
 }

 int
 winlink_next_index(struct winlinks *wwl)
 {
 	u_int	i;

 	for (i = 0; i < INT_MAX; i++) {
 		if (winlink_find_by_index(wwl, i) == NULL)
 			return (i);
 	}

 	fatalx("no free indexes");
 }

 struct winlink *
 winlink_add(struct winlinks *wwl, struct window *w, int idx)
 {
 	struct winlink	*wl;

 	if (idx == -1)
 		idx = winlink_next_index(wwl);
 	else if (winlink_find_by_index(wwl, idx) != NULL)
 		return (NULL);

 	if (idx < 0)
 		fatalx("bad index");

 	wl = xcalloc(1, sizeof *wl);
 	wl->idx = idx;
 	wl->window = w;
 	RB_INSERT(winlinks, wwl, wl);

 	w->references++;

 	return (wl);
 }

 void
 winlink_remove(struct winlinks *wwl, struct winlink *wl)
 {
 	struct window	*w = wl->window;

 	RB_REMOVE(winlinks, wwl, wl);
 	xfree(wl);

 	if (w->references == 0)
 		fatal("bad reference count");
 	w->references--;
 	if (w->references == 0)
 		window_destroy(w);
 }

 struct winlink *
 winlink_next(unused struct winlinks *wwl, struct winlink *wl)
 {
 	return (RB_NEXT(winlinks, wwl, wl));
 }

 struct winlink *
 winlink_previous(unused struct winlinks *wwl, struct winlink *wl)
 {
 #ifdef RB_PREV
 	return (RB_PREV(winlinks, wwl, wl));
 #else
 	struct winlink	*wk;
 	int		 idx = wl->idx;

 	wk = NULL;
 	wl = RB_MIN(winlinks, wwl);
 	while (wl != NULL && wl->idx < idx) {
 		wk = wl;
 		wl = RB_NEXT(winlinks, wwl, wl);
 	}
 	if (wl == NULL)
 		return (NULL);
 	return (wk);
 #endif
 }

 struct window *
 window_create(const char *name,
     const char *cmd, const char **env, u_int sx, u_int sy, u_int hlimit)
 {
 	struct window	*w;
 	struct winsize	 ws;
 	int		 fd, mode;
 	char		*ptr, *copy;
 	const char     **entry;

 	memset(&ws, 0, sizeof ws);
 	ws.ws_col = sx;
 	ws.ws_row = sy;

  	switch (forkpty(&fd, NULL, NULL, &ws)) {
 	case -1:
 		return (NULL);
 	case 0:
 		for (entry = env; *entry != NULL; entry++) {
 			if (putenv(*entry) != 0)
 				fatal("putenv failed");
 		}
 		sigreset();
 		log_debug("started child: cmd=%s; pid=%d", cmd, (int) getpid());
 		log_close();

 		execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
 		fatal("execl failed");
 	}

 	if ((mode = fcntl(fd, F_GETFL)) == -1)
 		fatal("fcntl failed");
 	if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
 		fatal("fcntl failed");
 	if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
 		fatal("fcntl failed");

 	w = xmalloc(sizeof *w);
 	w->fd = fd;
 	w->in = buffer_create(BUFSIZ);
 	w->out = buffer_create(BUFSIZ);
 	w->mode = NULL;
 	w->flags = 0;
 	w->limitx = w->limity = UINT_MAX;
 	screen_create(&w->base, sx, sy, hlimit);
 	w->screen = &w->base;
 	input_init(w);

 	if (name == NULL) {
 		/* XXX */
 		if (strncmp(cmd, "exec ", (sizeof "exec ") - 1) == 0)
 			copy = xstrdup(cmd + (sizeof "exec ") - 1);
 		else
 			copy = xstrdup(cmd);
 		if ((ptr = strchr(copy, ' ')) != NULL) {
 			if (ptr != copy && ptr[-1] != '\\')
 				*ptr = '\0';
 			else {
 				while ((ptr = strchr(ptr + 1, ' ')) != NULL) {
 					if (ptr[-1] != '\\') {
 						*ptr = '\0';
 						break;
 					}
 				}
 			}
 		}
 		w->name = xstrdup(xbasename(copy));
 		xfree(copy);
 	} else
 		w->name = xstrdup(name);

 	ARRAY_ADD(&windows, w);
 	w->references = 0;

 	return (w);
 }

 void
 window_destroy(struct window *w)
 {
 	u_int	i;

 	for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
 		if (ARRAY_ITEM(&windows, i) == w)
 			break;
 	}
 	ARRAY_REMOVE(&windows, i);

 	close(w->fd);

 	input_free(w);

 	window_reset_mode(w);
 	screen_destroy(&w->base);

 	buffer_destroy(w->in);
 	buffer_destroy(w->out);

 	xfree(w->name);
 	xfree(w);
 }

 int
 window_resize(struct window *w, u_int sx, u_int sy)
 {
 	struct winsize	ws;

 	if (sx == screen_size_x(&w->base) && sy == screen_size_y(&w->base))
 		return (-1);

 	memset(&ws, 0, sizeof ws);
 	ws.ws_col = sx;
 	ws.ws_row = sy;

 	screen_resize(&w->base, sx, sy);
 	if (w->mode != NULL)
 		w->mode->resize(w, sx, sy);

 	if (ioctl(w->fd, TIOCSWINSZ, &ws) == -1)
 		fatal("ioctl failed");
 	return (0);
 }

 int
 window_set_mode(struct window *w, const struct window_mode *mode)
 {
 	struct screen	*s;

 	if (w->mode != NULL || w->mode == mode)
 		return (1);

 	w->mode = mode;

 	if ((s = w->mode->init(w)) != NULL)
 		w->screen = s;
 	server_redraw_window(w);
 	return (0);
 }

 void
 window_reset_mode(struct window *w)
 {
 	if (w->mode == NULL)
 		return;

 	w->mode->free(w);
 	w->mode = NULL;

 	w->screen = &w->base;
 	server_redraw_window(w);
 }

 void
 window_parse(struct window *w)
 {
 	input_parse(w);
 }

 void
 window_key(struct window *w, int key)
 {
 	if (w->mode != NULL)
 		w->mode->key(w, key);
 	else
 		input_key(w, key);
 }
	/* $Id: window.c,v 1.43 2008-06-18 20:11:25 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 <fcntl.h>
	#include <signal.h>
	#include <stdint.h>
	#include <stdlib.h>
	#include <string.h>
	#include <termios.h>
	#include <unistd.h>

	#ifndef NO_PATHS_H
	#include <paths.h>
	#endif

	#ifdef USE_LIBUTIL_H
	#include <libutil.h>
	#else
	#ifdef USE_PTY_H
	#include <pty.h>
	#else
	#ifndef NO_FORKPTY
	#include <util.h>
	#endif
	#endif
	#endif

	#include "tmux.h"

	/*
	* Each window is attached to a pty. This file contains code to handle them.
	*
	* A window 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 window 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;

	RB_GENERATE(winlinks, winlink, entry, winlink_cmp);

	int
	winlink_cmp(struct winlink wl1, struct winlink wl2)
	{
	return (wl1->idx - wl2->idx);
	}

	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));
	}

	int
	winlink_next_index(struct winlinks *wwl)
	{
	u_int i;

	for (i = 0; i < INT_MAX; i++) {
	if (winlink_find_by_index(wwl, i) == NULL)
	return (i);
	}

	fatalx("no free indexes");
	}

	struct winlink *
	winlink_add(struct winlinks wwl, struct window w, int idx)
	{
	struct winlink *wl;

	if (idx == -1)
	idx = winlink_next_index(wwl);
	else if (winlink_find_by_index(wwl, idx) != NULL)
	return (NULL);

	if (idx < 0)
	fatalx("bad index");

	wl = xcalloc(1, sizeof *wl);
	wl->idx = idx;
	wl->window = w;
	RB_INSERT(winlinks, wwl, wl);

	w->references++;

	return (wl);
	}

	void
	winlink_remove(struct winlinks wwl, struct winlink wl)
	{
	struct window *w = wl->window;

	RB_REMOVE(winlinks, wwl, wl);
	xfree(wl);

	if (w->references == 0)
	fatal("bad reference count");
	w->references--;
	if (w->references == 0)
	window_destroy(w);
	}

	struct winlink *
	winlink_next(unused struct winlinks wwl, struct winlink wl)
	{
	return (RB_NEXT(winlinks, wwl, wl));
	}

	struct winlink *
	winlink_previous(unused struct winlinks wwl, struct winlink wl)
	{
	#ifdef RB_PREV
	return (RB_PREV(winlinks, wwl, wl));
	#else
	struct winlink *wk;
	int idx = wl->idx;

	wk = NULL;
	wl = RB_MIN(winlinks, wwl);
	while (wl != NULL && wl->idx < idx) {
	wk = wl;
	wl = RB_NEXT(winlinks, wwl, wl);
	}
	if (wl == NULL)
	return (NULL);
	return (wk);
	#endif
	}

	struct window *
	window_create(const char *name,
	const char cmd, const char *env, u_int sx, u_int sy, u_int hlimit)
	{
	struct window *w;
	struct winsize ws;
	int fd, mode;
	char ptr, copy;
	const char **entry;

	memset(&ws, 0, sizeof ws);
	ws.ws_col = sx;
	ws.ws_row = sy;

	switch (forkpty(&fd, NULL, NULL, &ws)) {
	case -1:
	return (NULL);
	case 0:
	for (entry = env; *entry != NULL; entry++) {
	if (putenv(*entry) != 0)
	fatal("putenv failed");
	}
	sigreset();
	log_debug("started child: cmd=%s; pid=%d", cmd, (int) getpid());
	log_close();

	execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
	fatal("execl failed");
	}

	if ((mode = fcntl(fd, F_GETFL)) == -1)
	fatal("fcntl failed");
	if (fcntl(fd, F_SETFL, mode\|O_NONBLOCK) == -1)
	fatal("fcntl failed");
	if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
	fatal("fcntl failed");

	w = xmalloc(sizeof *w);
	w->fd = fd;
	w->in = buffer_create(BUFSIZ);
	w->out = buffer_create(BUFSIZ);
	w->mode = NULL;
	w->flags = 0;
	w->limitx = w->limity = UINT_MAX;
	screen_create(&w->base, sx, sy, hlimit);
	w->screen = &w->base;
	input_init(w);

	if (name == NULL) {
	/* XXX */
	if (strncmp(cmd, "exec ", (sizeof "exec ") - 1) == 0)
	copy = xstrdup(cmd + (sizeof "exec ") - 1);
	else
	copy = xstrdup(cmd);
	if ((ptr = strchr(copy, ' ')) != NULL) {
	if (ptr != copy && ptr[-1] != '\\')
	*ptr = '\0';
	else {
	while ((ptr = strchr(ptr + 1, ' ')) != NULL) {
	if (ptr[-1] != '\\') {
	*ptr = '\0';
	break;
	}
	}
	}
	}
	w->name = xstrdup(xbasename(copy));
	xfree(copy);
	} else
	w->name = xstrdup(name);

	ARRAY_ADD(&windows, w);
	w->references = 0;

	return (w);
	}

	void
	window_destroy(struct window *w)
	{
	u_int i;

	for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
	if (ARRAY_ITEM(&windows, i) == w)
	break;
	}
	ARRAY_REMOVE(&windows, i);

	close(w->fd);

	input_free(w);

	window_reset_mode(w);
	screen_destroy(&w->base);

	buffer_destroy(w->in);
	buffer_destroy(w->out);

	xfree(w->name);
	xfree(w);
	}

	int
	window_resize(struct window *w, u_int sx, u_int sy)
	{
	struct winsize ws;

	if (sx == screen_size_x(&w->base) && sy == screen_size_y(&w->base))
	return (-1);

	memset(&ws, 0, sizeof ws);
	ws.ws_col = sx;
	ws.ws_row = sy;

	screen_resize(&w->base, sx, sy);
	if (w->mode != NULL)
	w->mode->resize(w, sx, sy);

	if (ioctl(w->fd, TIOCSWINSZ, &ws) == -1)
	fatal("ioctl failed");
	return (0);
	}

	int
	window_set_mode(struct window w, const struct window_mode mode)
	{
	struct screen *s;

	if (w->mode != NULL \|\| w->mode == mode)
	return (1);

	w->mode = mode;

	if ((s = w->mode->init(w)) != NULL)
	w->screen = s;
	server_redraw_window(w);
	return (0);
	}

	void
	window_reset_mode(struct window *w)
	{
	if (w->mode == NULL)
	return;

	w->mode->free(w);
	w->mode = NULL;

	w->screen = &w->base;
	server_redraw_window(w);
	}

	void
	window_parse(struct window *w)
	{
	input_parse(w);
	}

	void
	window_key(struct window *w, int key)
	{
	if (w->mode != NULL)
	w->mode->key(w, key);
	else
	input_key(w, key);
	}