tmux/window.c

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/* $Id: window.c,v 1.44 2008-06-18 22:21:51 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>
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#ifndef NO_PATHS_H
#include <paths.h>
#endif
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#ifdef USE_LIBUTIL_H
#include <libutil.h>
#else
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#ifdef USE_PTY_H
#include <pty.h>
#else
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#ifndef NO_FORKPTY
#include <util.h>
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#endif
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#endif
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#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
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* 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 *
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winlink_previous(unused struct winlinks *wwl, struct winlink *wl)
{
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#ifdef RB_PREV
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return (RB_PREV(winlinks, wwl, wl));
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#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 *
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window_create(const char *name,
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const char *cmd, const char **env, u_int sx, u_int sy, u_int hlimit)
{
struct window *w;
struct winsize ws;
int fd, mode;
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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:
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for (entry = env; *entry != NULL; entry++) {
if (putenv(*entry) != 0)
fatal("putenv failed");
}
sigreset();
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log_debug("started child: cmd=%s; pid=%d", cmd, (int) getpid());
log_close();
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execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
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fatal("execl failed");
}
if ((mode = fcntl(fd, F_GETFL)) == -1)
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fatal("fcntl failed");
if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
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fatal("fcntl failed");
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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);
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w->mode = NULL;
w->flags = 0;
w->limitx = w->limity = UINT_MAX;
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screen_create(&w->base, sx, sy, hlimit);
w->screen = &w->base;
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input_init(w);
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if (name == NULL) {
/* XXX */
if (strncmp(cmd, "exec ", (sizeof "exec ") - 1) == 0)
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copy = xstrdup(cmd + (sizeof "exec ") - 1);
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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;
}
}
}
}
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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);
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input_free(w);
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window_reset_mode(w);
screen_destroy(&w->base);
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buffer_destroy(w->in);
buffer_destroy(w->out);
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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);
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if (w->mode != NULL)
w->mode->resize(w, sx, sy);
if (ioctl(w->fd, TIOCSWINSZ, &ws) == -1)
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fatal("ioctl failed");
return (0);
}
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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);
}
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void
window_parse(struct window *w)
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{
input_parse(w);
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}
void
window_key(struct window *w, int key)
{
if (w->mode != NULL)
w->mode->key(w, key);
else
input_key(w, key);
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}