tmux.c - tmux - Rivoreo Source Code Repositories

 /* $Id: tmux.c,v 1.225 2010-12-07 20:23:21 micahcowan 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/stat.h>

 #include <errno.h>
 #include <event.h>
 #include <fcntl.h>
 #include <pwd.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>

 #include "tmux.h"

 #if defined(DEBUG) && defined(__OpenBSD__)
 extern char	*malloc_options;
 #endif

 struct options	 global_options;	/* server options */
 struct options	 global_s_options;	/* session options */
 struct options	 global_w_options;	/* window options */
 struct environ	 global_environ;

 struct event_base *ev_base;

 char		*cfg_file;
 char		*shell_cmd;
 int		 debug_level;
 time_t		 start_time;
 char		 socket_path[MAXPATHLEN];
 int		 login_shell;
 char		*environ_path;
 pid_t		 environ_pid;
 u_int		 environ_idx;

 __dead void	 usage(void);
 void	 	 parseenvironment(void);
 char 		*makesocketpath(const char *);

 #ifndef HAVE_PROGNAME
 char      *__progname = (char *) "tmux";
 #endif

 __dead void
 usage(void)
 {
 	fprintf(stderr,
 	    "usage: %s [-28lquv] [-c shell-command] [-f file] [-L socket-name]\n"
 	    "            [-S socket-path] [command [flags]]\n",
 	    __progname);
 	exit(1);
 }

 void
 logfile(const char *name)
 {
 	char	*path;

 	log_close();
 	if (debug_level > 0) {
 		xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid());
 		log_open_file(debug_level, path);
 		xfree(path);
 	}
 }

 const char *
 getshell(void)
 {
 	struct passwd	*pw;
 	const char	*shell;

 	shell = getenv("SHELL");
 	if (checkshell(shell))
 		return (shell);

 	pw = getpwuid(getuid());
 	if (pw != NULL && checkshell(pw->pw_shell))
 		return (pw->pw_shell);

 	return (_PATH_BSHELL);
 }

 int
 checkshell(const char *shell)
 {
 	if (shell == NULL || *shell == '\0' || areshell(shell))
 		return (0);
 	if (access(shell, X_OK) != 0)
 		return (0);
 	return (1);
 }

 int
 areshell(const char *shell)
 {
 	const char	*progname, *ptr;

 	if ((ptr = strrchr(shell, '/')) != NULL)
 		ptr++;
 	else
 		ptr = shell;
 	progname = __progname;
 	if (*progname == '-')
 		progname++;
 	if (strcmp(ptr, progname) == 0)
 		return (1);
 	return (0);
 }

 void
 parseenvironment(void)
 {
 	char		*env, *path_pid, *pid_idx, buf[256];
 	size_t		 len;
 	const char	*errstr;
 	long long	 ll;

 	environ_pid = -1;
 	if ((env = getenv("TMUX")) == NULL)
 		return;

 	if ((path_pid = strchr(env, ',')) == NULL || path_pid == env)
 		return;
 	if ((pid_idx = strchr(path_pid + 1, ',')) == NULL)
 		return;
 	if ((pid_idx == path_pid + 1 || pid_idx[1] == '\0'))
 		return;

 	/* path */
 	len = path_pid - env;
 	environ_path = xmalloc(len + 1);
 	memcpy(environ_path, env, len);
 	environ_path[len] = '\0';

 	/* pid */
 	len = pid_idx - path_pid - 1;
 	if (len > (sizeof buf) - 1)
 		return;
 	memcpy(buf, path_pid + 1, len);
 	buf[len] = '\0';

 	ll = strtonum(buf, 0, LONG_MAX, &errstr);
 	if (errstr != NULL)
 		return;
 	environ_pid = ll;

 	/* idx */
 	ll = strtonum(pid_idx + 1, 0, UINT_MAX, &errstr);
 	if (errstr != NULL)
 		return;
 	environ_idx = ll;
 }

 char *
 makesocketpath(const char *label)
 {
 	char		base[MAXPATHLEN], *path;
 	struct stat	sb;
 	u_int		uid;

 	uid = getuid();
 	xsnprintf(base, MAXPATHLEN, "%s/tmux-%d", _PATH_TMP, uid);

 	if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
 		return (NULL);

 	if (lstat(base, &sb) != 0)
 		return (NULL);
 	if (!S_ISDIR(sb.st_mode)) {
 		errno = ENOTDIR;
 		return (NULL);
 	}
 	if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) {
 		errno = EACCES;
 		return (NULL);
 	}

 	xasprintf(&path, "%s/%s", base, label);
 	return (path);
 }

 __dead void
 shell_exec(const char *shell, const char *shellcmd)
 {
 	const char	*shellname, *ptr;
 	char		*argv0;
 	int		 mode;

 	ptr = strrchr(shell, '/');
 	if (ptr != NULL && *(ptr + 1) != '\0')
 		shellname = ptr + 1;
 	else
 		shellname = shell;
 	if (login_shell)
 		xasprintf(&argv0, "-%s", shellname);
 	else
 		xasprintf(&argv0, "%s", shellname);
 	setenv("SHELL", shell, 1);

 	if ((mode = fcntl(STDIN_FILENO, F_GETFL)) != -1)
 		fcntl(STDIN_FILENO, F_SETFL, mode & ~O_NONBLOCK);
 	if ((mode = fcntl(STDOUT_FILENO, F_GETFL)) != -1)
 		fcntl(STDOUT_FILENO, F_SETFL, mode & ~O_NONBLOCK);
 	if ((mode = fcntl(STDERR_FILENO, F_GETFL)) != -1)
 		fcntl(STDERR_FILENO, F_SETFL, mode & ~O_NONBLOCK);
 	closefrom(STDERR_FILENO + 1);

 	execl(shell, argv0, "-c", shellcmd, (char *) NULL);
 	fatal("execl failed");
 }

 int
 main(int argc, char **argv)
 {
 	struct passwd	*pw;
 	struct options	*oo, *so, *wo;
 	struct keylist	*keylist;
 	char		*s, *path, *label, *home, **var;
 	int	 	 opt, flags, quiet, keys;

 #if defined(DEBUG) && defined(__OpenBSD__)
 	malloc_options = (char *) "AFGJPX";
 #endif

 	quiet = flags = 0;
 	label = path = NULL;
 	login_shell = (**argv == '-');
 	while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUv")) != -1) {
 		switch (opt) {
 		case '2':
 			flags |= IDENTIFY_256COLOURS;
 			flags &= ~IDENTIFY_88COLOURS;
 			break;
 		case '8':
 			flags |= IDENTIFY_88COLOURS;
 			flags &= ~IDENTIFY_256COLOURS;
 			break;
 		case 'c':
 			if (shell_cmd != NULL)
 				xfree(shell_cmd);
 			shell_cmd = xstrdup(optarg);
 			break;
 		case 'f':
 			if (cfg_file != NULL)
 				xfree(cfg_file);
 			cfg_file = xstrdup(optarg);
 			break;
 		case 'l':
 			login_shell = 1;
 			break;
 		case 'L':
 			if (label != NULL)
 				xfree(label);
 			label = xstrdup(optarg);
 			break;
 		case 'q':
 			quiet = 1;
 			break;
 		case 'S':
 			if (path != NULL)
 				xfree(path);
 			path = xstrdup(optarg);
 			break;
 		case 'u':
 			flags |= IDENTIFY_UTF8;
 			break;
 		case 'v':
 			debug_level++;
 			break;
 		default:
 			usage();
 		}
 	}
 	argc -= optind;
 	argv += optind;

 	if (shell_cmd != NULL && argc != 0)
 		usage();

 	log_open_tty(debug_level);

 	if (!(flags & IDENTIFY_UTF8)) {
 		/*
 		 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG
 		 * exist (in that order) to contain UTF-8, it is a safe
 		 * assumption that either they are using a UTF-8 terminal, or
 		 * if not they know that output from UTF-8-capable programs may
 		 * be wrong.
 		 */
 		if ((s = getenv("LC_ALL")) == NULL) {
 			if ((s = getenv("LC_CTYPE")) == NULL)
 				s = getenv("LANG");
 		}
 		if (s != NULL && (strcasestr(s, "UTF-8") != NULL ||
 		    strcasestr(s, "UTF8") != NULL))
 			flags |= IDENTIFY_UTF8;
 	}

 	environ_init(&global_environ);
 	for (var = environ; *var != NULL; var++)
 		environ_put(&global_environ, *var);

 	options_init(&global_options, NULL);
 	oo = &global_options;
 	options_set_number(oo, "quiet", quiet);
 	options_set_number(oo, "escape-time", 500);
 	options_set_number(oo, "exit-unattached", 0);

 	options_init(&global_s_options, NULL);
 	so = &global_s_options;
 	options_set_number(so, "base-index", 0);
 	options_set_number(so, "bell-action", BELL_ANY);
 	options_set_number(so, "buffer-limit", 9);
 	options_set_string(so, "default-command", "%s", "");
 	options_set_string(so, "default-path", "%s", "");
 	options_set_string(so, "default-shell", "%s", getshell());
 	options_set_string(so, "default-terminal", "screen");
 	options_set_number(so, "destroy-unattached", 0);
 	options_set_number(so, "detach-on-destroy", 1);
 	options_set_number(so, "display-panes-active-colour", 1);
 	options_set_number(so, "display-panes-colour", 4);
 	options_set_number(so, "display-panes-time", 1000);
 	options_set_number(so, "display-time", 750);
 	options_set_number(so, "history-limit", 2000);
 	options_set_number(so, "lock-after-time", 0);
 	options_set_string(so, "lock-command", "lock -np");
 	options_set_number(so, "lock-server", 1);
 	options_set_number(so, "message-attr", 0);
 	options_set_number(so, "message-bg", 3);
 	options_set_number(so, "message-fg", 0);
 	options_set_number(so, "message-limit", 20);
 	options_set_number(so, "mouse-select-pane", 0);
 	options_set_number(so, "pane-active-border-bg", 8);
 	options_set_number(so, "pane-active-border-fg", 2);
 	options_set_number(so, "pane-border-bg", 8);
 	options_set_number(so, "pane-border-fg", 8);
 	options_set_number(so, "repeat-time", 500);
 	options_set_number(so, "set-remain-on-exit", 0);
 	options_set_number(so, "set-titles", 0);
 	options_set_string(so, "set-titles-string", "#S:#I:#W - \"#T\"");
 	options_set_number(so, "status", 1);
 	options_set_number(so, "status-attr", 0);
 	options_set_number(so, "status-bg", 2);
 	options_set_number(so, "status-fg", 0);
 	options_set_number(so, "status-interval", 15);
 	options_set_number(so, "status-justify", 0);
 	options_set_string(so, "status-left", "[#S]");
 	options_set_number(so, "status-left-attr", 0);
 	options_set_number(so, "status-left-bg", 8);
 	options_set_number(so, "status-left-fg", 8);
 	options_set_number(so, "status-left-length", 10);
 	options_set_string(so, "status-right", "\"#22T\" %%H:%%M %%d-%%b-%%y");
 	options_set_number(so, "status-right-attr", 0);
 	options_set_number(so, "status-right-bg", 8);
 	options_set_number(so, "status-right-fg", 8);
 	options_set_number(so, "status-right-length", 40);
 	options_set_string(so, "terminal-overrides",
 	    "*88col*:colors=88,*256col*:colors=256");
 	options_set_string(so, "update-environment",
 	    "DISPLAY "
 	    "SSH_ASKPASS SSH_AUTH_SOCK SSH_AGENT_PID SSH_CONNECTION "
 	    "WINDOWID "
 	    "XAUTHORITY");
 	options_set_number(so, "visual-activity", 0);
 	options_set_number(so, "visual-bell", 0);
 	options_set_number(so, "visual-content", 0);
 	options_set_number(so, "visual-silence", 0);

 	keylist = xmalloc(sizeof *keylist);
 	ARRAY_INIT(keylist);
 	ARRAY_ADD(keylist, '\002');
 	options_set_data(so, "prefix", keylist, xfree);

 	options_init(&global_w_options, NULL);
 	wo = &global_w_options;
 	options_set_number(wo, "aggressive-resize", 0);
 	options_set_number(wo, "alternate-screen", 1);
 	options_set_number(wo, "automatic-rename", 1);
 	options_set_number(wo, "clock-mode-colour", 4);
 	options_set_number(wo, "clock-mode-style", 1);
 	options_set_number(wo, "force-height", 0);
 	options_set_number(wo, "force-width", 0);
 	options_set_number(wo, "main-pane-height", 24);
 	options_set_number(wo, "main-pane-width", 80);
 	options_set_number(wo, "mode-attr", 0);
 	options_set_number(wo, "mode-bg", 3);
 	options_set_number(wo, "mode-fg", 0);
 	options_set_number(wo, "mode-mouse", 0);
 	options_set_number(wo, "monitor-activity", 0);
 	options_set_string(wo, "monitor-content", "%s", "");
 	options_set_number(wo, "monitor-silence", 0);
 	options_set_number(wo, "window-status-attr", 0);
 	options_set_number(wo, "window-status-bg", 8);
 	options_set_number(wo, "window-status-current-attr", 0);
 	options_set_number(wo, "window-status-current-bg", 8);
 	options_set_number(wo, "window-status-current-fg", 8);
 	options_set_number(wo, "window-status-fg", 8);
 	options_set_number(wo, "window-status-alert-attr", GRID_ATTR_REVERSE);
 	options_set_number(wo, "window-status-alert-bg", 8);
 	options_set_number(wo, "window-status-alert-fg", 8);
 	options_set_string(wo, "window-status-format", "#I:#W#F");
 	options_set_string(wo, "window-status-current-format", "#I:#W#F");
 	options_set_string(wo, "word-separators", " -_@");
 	options_set_number(wo, "xterm-keys", 0);
 	options_set_number(wo, "remain-on-exit", 0);
 	options_set_number(wo, "synchronize-panes", 0);

 	if (flags & IDENTIFY_UTF8) {
 		options_set_number(so, "status-utf8", 1);
 		options_set_number(wo, "utf8", 1);
 	} else {
 		options_set_number(so, "status-utf8", 0);
 		options_set_number(wo, "utf8", 0);
 	}

 	keys = MODEKEY_EMACS;
 	if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
 		if (strrchr(s, '/') != NULL)
 			s = strrchr(s, '/') + 1;
 		if (strstr(s, "vi") != NULL)
 			keys = MODEKEY_VI;
 	}
 	options_set_number(so, "status-keys", keys);
 	options_set_number(wo, "mode-keys", keys);

 	/* Locate the configuration file. */
 	if (cfg_file == NULL) {
 		home = getenv("HOME");
 		if (home == NULL || *home == '\0') {
 			pw = getpwuid(getuid());
 			if (pw != NULL)
 				home = pw->pw_dir;
 		}
 		xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG);
 		if (access(cfg_file, R_OK) != 0 && errno == ENOENT) {
 			xfree(cfg_file);
 			cfg_file = NULL;
 		}
 	}

 	/*
 	 * Figure out the socket path. If specified on the command-line with -S
 	 * or -L, use it, otherwise try $TMUX or assume -L default.
 	 */
 	parseenvironment();
 	if (path == NULL) {
 		/* If no -L, use the environment. */
 		if (label == NULL) {
 			if (environ_path != NULL)
 				path = xstrdup(environ_path);
 			else
 				label = xstrdup("default");
 		}

 		/* -L or default set. */
 		if (label != NULL) {
 			if ((path = makesocketpath(label)) == NULL) {
 				log_warn("can't create socket");
 				exit(1);
 			}
 		}
 	}
 	if (label != NULL)
 		xfree(label);
 	if (realpath(path, socket_path) == NULL)
 		strlcpy(socket_path, path, sizeof socket_path);
 	xfree(path);

 #ifdef HAVE_SETPROCTITLE
 	/* Set process title. */
 	setproctitle("%s (%s)", __progname, socket_path);
 #endif

 	/* Pass control to the client. */
 #ifdef HAVE_BROKEN_KQUEUE
 	if (setenv("EVENT_NOKQUEUE", "1", 1) != 0)
 		fatal("setenv failed");
 #endif
 #ifdef HAVE_BROKEN_POLL
 	if (setenv("EVENT_NOPOLL", "1", 1) != 0)
 		fatal("setenv failed");
 #endif
 	ev_base = event_init();
 #ifdef HAVE_BROKEN_KQUEUE
 	unsetenv("EVENT_NOKQUEUE");
 #endif
 #ifdef HAVE_BROKEN_POLL
 	unsetenv("EVENT_NOPOLL");
 #endif
 	exit(client_main(argc, argv, flags));
 }
	/* $Id: tmux.c,v 1.225 2010-12-07 20:23:21 micahcowan 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/stat.h>

	#include <errno.h>
	#include <event.h>
	#include <fcntl.h>
	#include <pwd.h>
	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>

	#include "tmux.h"

	#if defined(DEBUG) && defined(__OpenBSD__)
	extern char *malloc_options;
	#endif

	struct options global_options; /* server options */
	struct options global_s_options; /* session options */
	struct options global_w_options; /* window options */
	struct environ global_environ;

	struct event_base *ev_base;

	char *cfg_file;
	char *shell_cmd;
	int debug_level;
	time_t start_time;
	char socket_path[MAXPATHLEN];
	int login_shell;
	char *environ_path;
	pid_t environ_pid;
	u_int environ_idx;

	__dead void usage(void);
	void parseenvironment(void);
	char makesocketpath(const char );

	#ifndef HAVE_PROGNAME
	char __progname = (char ) "tmux";
	#endif

	__dead void
	usage(void)
	{
	fprintf(stderr,
	"usage: %s [-28lquv] [-c shell-command] [-f file] [-L socket-name]\n"
	" [-S socket-path] [command [flags]]\n",
	__progname);
	exit(1);
	}

	void
	logfile(const char *name)
	{
	char *path;

	log_close();
	if (debug_level > 0) {
	xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid());
	log_open_file(debug_level, path);
	xfree(path);
	}
	}

	const char *
	getshell(void)
	{
	struct passwd *pw;
	const char *shell;

	shell = getenv("SHELL");
	if (checkshell(shell))
	return (shell);

	pw = getpwuid(getuid());
	if (pw != NULL && checkshell(pw->pw_shell))
	return (pw->pw_shell);

	return (_PATH_BSHELL);
	}

	int
	checkshell(const char *shell)
	{
	if (shell == NULL \|\| *shell == '\0' \|\| areshell(shell))
	return (0);
	if (access(shell, X_OK) != 0)
	return (0);
	return (1);
	}

	int
	areshell(const char *shell)
	{
	const char progname, ptr;

	if ((ptr = strrchr(shell, '/')) != NULL)
	ptr++;
	else
	ptr = shell;
	progname = __progname;
	if (*progname == '-')
	progname++;
	if (strcmp(ptr, progname) == 0)
	return (1);
	return (0);
	}

	void
	parseenvironment(void)
	{
	char env, path_pid, *pid_idx, buf[256];
	size_t len;
	const char *errstr;
	long long ll;

	environ_pid = -1;
	if ((env = getenv("TMUX")) == NULL)
	return;

	if ((path_pid = strchr(env, ',')) == NULL \|\| path_pid == env)
	return;
	if ((pid_idx = strchr(path_pid + 1, ',')) == NULL)
	return;
	if ((pid_idx == path_pid + 1 \|\| pid_idx[1] == '\0'))
	return;

	/* path */
	len = path_pid - env;
	environ_path = xmalloc(len + 1);
	memcpy(environ_path, env, len);
	environ_path[len] = '\0';

	/* pid */
	len = pid_idx - path_pid - 1;
	if (len > (sizeof buf) - 1)
	return;
	memcpy(buf, path_pid + 1, len);
	buf[len] = '\0';

	ll = strtonum(buf, 0, LONG_MAX, &errstr);
	if (errstr != NULL)
	return;
	environ_pid = ll;

	/* idx */
	ll = strtonum(pid_idx + 1, 0, UINT_MAX, &errstr);
	if (errstr != NULL)
	return;
	environ_idx = ll;
	}

	char *
	makesocketpath(const char *label)
	{
	char base[MAXPATHLEN], *path;
	struct stat sb;
	u_int uid;

	uid = getuid();
	xsnprintf(base, MAXPATHLEN, "%s/tmux-%d", _PATH_TMP, uid);

	if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
	return (NULL);

	if (lstat(base, &sb) != 0)
	return (NULL);
	if (!S_ISDIR(sb.st_mode)) {
	errno = ENOTDIR;
	return (NULL);
	}
	if (sb.st_uid != uid \|\| (sb.st_mode & (S_IRWXG\|S_IRWXO)) != 0) {
	errno = EACCES;
	return (NULL);
	}

	xasprintf(&path, "%s/%s", base, label);
	return (path);
	}

	__dead void
	shell_exec(const char shell, const char shellcmd)
	{
	const char shellname, ptr;
	char *argv0;
	int mode;

	ptr = strrchr(shell, '/');
	if (ptr != NULL && *(ptr + 1) != '\0')
	shellname = ptr + 1;
	else
	shellname = shell;
	if (login_shell)
	xasprintf(&argv0, "-%s", shellname);
	else
	xasprintf(&argv0, "%s", shellname);
	setenv("SHELL", shell, 1);

	if ((mode = fcntl(STDIN_FILENO, F_GETFL)) != -1)
	fcntl(STDIN_FILENO, F_SETFL, mode & ~O_NONBLOCK);
	if ((mode = fcntl(STDOUT_FILENO, F_GETFL)) != -1)
	fcntl(STDOUT_FILENO, F_SETFL, mode & ~O_NONBLOCK);
	if ((mode = fcntl(STDERR_FILENO, F_GETFL)) != -1)
	fcntl(STDERR_FILENO, F_SETFL, mode & ~O_NONBLOCK);
	closefrom(STDERR_FILENO + 1);

	execl(shell, argv0, "-c", shellcmd, (char *) NULL);
	fatal("execl failed");
	}

	int
	main(int argc, char **argv)
	{
	struct passwd *pw;
	struct options oo, so, *wo;
	struct keylist *keylist;
	char s, path, label, home, **var;
	int opt, flags, quiet, keys;

	#if defined(DEBUG) && defined(__OpenBSD__)
	malloc_options = (char *) "AFGJPX";
	#endif

	quiet = flags = 0;
	label = path = NULL;
	login_shell = (**argv == '-');
	while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUv")) != -1) {
	switch (opt) {
	case '2':
	flags \|= IDENTIFY_256COLOURS;
	flags &= ~IDENTIFY_88COLOURS;
	break;
	case '8':
	flags \|= IDENTIFY_88COLOURS;
	flags &= ~IDENTIFY_256COLOURS;
	break;
	case 'c':
	if (shell_cmd != NULL)
	xfree(shell_cmd);
	shell_cmd = xstrdup(optarg);
	break;
	case 'f':
	if (cfg_file != NULL)
	xfree(cfg_file);
	cfg_file = xstrdup(optarg);
	break;
	case 'l':
	login_shell = 1;
	break;
	case 'L':
	if (label != NULL)
	xfree(label);
	label = xstrdup(optarg);
	break;
	case 'q':
	quiet = 1;
	break;
	case 'S':
	if (path != NULL)
	xfree(path);
	path = xstrdup(optarg);
	break;
	case 'u':
	flags \|= IDENTIFY_UTF8;
	break;
	case 'v':
	debug_level++;
	break;
	default:
	usage();
	}
	}
	argc -= optind;
	argv += optind;

	if (shell_cmd != NULL && argc != 0)
	usage();

	log_open_tty(debug_level);

	if (!(flags & IDENTIFY_UTF8)) {
	/*
	* If the user has set whichever of LC_ALL, LC_CTYPE or LANG
	* exist (in that order) to contain UTF-8, it is a safe
	* assumption that either they are using a UTF-8 terminal, or
	* if not they know that output from UTF-8-capable programs may
	* be wrong.
	*/
	if ((s = getenv("LC_ALL")) == NULL) {
	if ((s = getenv("LC_CTYPE")) == NULL)
	s = getenv("LANG");
	}
	if (s != NULL && (strcasestr(s, "UTF-8") != NULL \|\|
	strcasestr(s, "UTF8") != NULL))
	flags \|= IDENTIFY_UTF8;
	}

	environ_init(&global_environ);
	for (var = environ; *var != NULL; var++)
	environ_put(&global_environ, *var);

	options_init(&global_options, NULL);
	oo = &global_options;
	options_set_number(oo, "quiet", quiet);
	options_set_number(oo, "escape-time", 500);
	options_set_number(oo, "exit-unattached", 0);

	options_init(&global_s_options, NULL);
	so = &global_s_options;
	options_set_number(so, "base-index", 0);
	options_set_number(so, "bell-action", BELL_ANY);
	options_set_number(so, "buffer-limit", 9);
	options_set_string(so, "default-command", "%s", "");
	options_set_string(so, "default-path", "%s", "");
	options_set_string(so, "default-shell", "%s", getshell());
	options_set_string(so, "default-terminal", "screen");
	options_set_number(so, "destroy-unattached", 0);
	options_set_number(so, "detach-on-destroy", 1);
	options_set_number(so, "display-panes-active-colour", 1);
	options_set_number(so, "display-panes-colour", 4);
	options_set_number(so, "display-panes-time", 1000);
	options_set_number(so, "display-time", 750);
	options_set_number(so, "history-limit", 2000);
	options_set_number(so, "lock-after-time", 0);
	options_set_string(so, "lock-command", "lock -np");
	options_set_number(so, "lock-server", 1);
	options_set_number(so, "message-attr", 0);
	options_set_number(so, "message-bg", 3);
	options_set_number(so, "message-fg", 0);
	options_set_number(so, "message-limit", 20);
	options_set_number(so, "mouse-select-pane", 0);
	options_set_number(so, "pane-active-border-bg", 8);
	options_set_number(so, "pane-active-border-fg", 2);
	options_set_number(so, "pane-border-bg", 8);
	options_set_number(so, "pane-border-fg", 8);
	options_set_number(so, "repeat-time", 500);
	options_set_number(so, "set-remain-on-exit", 0);
	options_set_number(so, "set-titles", 0);
	options_set_string(so, "set-titles-string", "#S:#I:#W - \"#T\"");
	options_set_number(so, "status", 1);
	options_set_number(so, "status-attr", 0);
	options_set_number(so, "status-bg", 2);
	options_set_number(so, "status-fg", 0);
	options_set_number(so, "status-interval", 15);
	options_set_number(so, "status-justify", 0);
	options_set_string(so, "status-left", "[#S]");
	options_set_number(so, "status-left-attr", 0);
	options_set_number(so, "status-left-bg", 8);
	options_set_number(so, "status-left-fg", 8);
	options_set_number(so, "status-left-length", 10);
	options_set_string(so, "status-right", "\"#22T\" %%H:%%M %%d-%%b-%%y");
	options_set_number(so, "status-right-attr", 0);
	options_set_number(so, "status-right-bg", 8);
	options_set_number(so, "status-right-fg", 8);
	options_set_number(so, "status-right-length", 40);
	options_set_string(so, "terminal-overrides",
	"88col:colors=88,256col:colors=256");
	options_set_string(so, "update-environment",
	"DISPLAY "
	"SSH_ASKPASS SSH_AUTH_SOCK SSH_AGENT_PID SSH_CONNECTION "
	"WINDOWID "
	"XAUTHORITY");
	options_set_number(so, "visual-activity", 0);
	options_set_number(so, "visual-bell", 0);
	options_set_number(so, "visual-content", 0);
	options_set_number(so, "visual-silence", 0);

	keylist = xmalloc(sizeof *keylist);
	ARRAY_INIT(keylist);
	ARRAY_ADD(keylist, '\002');
	options_set_data(so, "prefix", keylist, xfree);

	options_init(&global_w_options, NULL);
	wo = &global_w_options;
	options_set_number(wo, "aggressive-resize", 0);
	options_set_number(wo, "alternate-screen", 1);
	options_set_number(wo, "automatic-rename", 1);
	options_set_number(wo, "clock-mode-colour", 4);
	options_set_number(wo, "clock-mode-style", 1);
	options_set_number(wo, "force-height", 0);
	options_set_number(wo, "force-width", 0);
	options_set_number(wo, "main-pane-height", 24);
	options_set_number(wo, "main-pane-width", 80);
	options_set_number(wo, "mode-attr", 0);
	options_set_number(wo, "mode-bg", 3);
	options_set_number(wo, "mode-fg", 0);
	options_set_number(wo, "mode-mouse", 0);
	options_set_number(wo, "monitor-activity", 0);
	options_set_string(wo, "monitor-content", "%s", "");
	options_set_number(wo, "monitor-silence", 0);
	options_set_number(wo, "window-status-attr", 0);
	options_set_number(wo, "window-status-bg", 8);
	options_set_number(wo, "window-status-current-attr", 0);
	options_set_number(wo, "window-status-current-bg", 8);
	options_set_number(wo, "window-status-current-fg", 8);
	options_set_number(wo, "window-status-fg", 8);
	options_set_number(wo, "window-status-alert-attr", GRID_ATTR_REVERSE);
	options_set_number(wo, "window-status-alert-bg", 8);
	options_set_number(wo, "window-status-alert-fg", 8);
	options_set_string(wo, "window-status-format", "#I:#W#F");
	options_set_string(wo, "window-status-current-format", "#I:#W#F");
	options_set_string(wo, "word-separators", " -_@");
	options_set_number(wo, "xterm-keys", 0);
	options_set_number(wo, "remain-on-exit", 0);
	options_set_number(wo, "synchronize-panes", 0);

	if (flags & IDENTIFY_UTF8) {
	options_set_number(so, "status-utf8", 1);
	options_set_number(wo, "utf8", 1);
	} else {
	options_set_number(so, "status-utf8", 0);
	options_set_number(wo, "utf8", 0);
	}

	keys = MODEKEY_EMACS;
	if ((s = getenv("VISUAL")) != NULL \|\| (s = getenv("EDITOR")) != NULL) {
	if (strrchr(s, '/') != NULL)
	s = strrchr(s, '/') + 1;
	if (strstr(s, "vi") != NULL)
	keys = MODEKEY_VI;
	}
	options_set_number(so, "status-keys", keys);
	options_set_number(wo, "mode-keys", keys);

	/* Locate the configuration file. */
	if (cfg_file == NULL) {
	home = getenv("HOME");
	if (home == NULL \|\| *home == '\0') {
	pw = getpwuid(getuid());
	if (pw != NULL)
	home = pw->pw_dir;
	}
	xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG);
	if (access(cfg_file, R_OK) != 0 && errno == ENOENT) {
	xfree(cfg_file);
	cfg_file = NULL;
	}
	}

	/*
	* Figure out the socket path. If specified on the command-line with -S
	* or -L, use it, otherwise try $TMUX or assume -L default.
	*/
	parseenvironment();
	if (path == NULL) {
	/* If no -L, use the environment. */
	if (label == NULL) {
	if (environ_path != NULL)
	path = xstrdup(environ_path);
	else
	label = xstrdup("default");
	}

	/* -L or default set. */
	if (label != NULL) {
	if ((path = makesocketpath(label)) == NULL) {
	log_warn("can't create socket");
	exit(1);
	}
	}
	}
	if (label != NULL)
	xfree(label);
	if (realpath(path, socket_path) == NULL)
	strlcpy(socket_path, path, sizeof socket_path);
	xfree(path);

	#ifdef HAVE_SETPROCTITLE
	/* Set process title. */
	setproctitle("%s (%s)", __progname, socket_path);
	#endif

	/* Pass control to the client. */
	#ifdef HAVE_BROKEN_KQUEUE
	if (setenv("EVENT_NOKQUEUE", "1", 1) != 0)
	fatal("setenv failed");
	#endif
	#ifdef HAVE_BROKEN_POLL
	if (setenv("EVENT_NOPOLL", "1", 1) != 0)
	fatal("setenv failed");
	#endif
	ev_base = event_init();
	#ifdef HAVE_BROKEN_KQUEUE
	unsetenv("EVENT_NOKQUEUE");
	#endif
	#ifdef HAVE_BROKEN_POLL
	unsetenv("EVENT_NOPOLL");
	#endif
	exit(client_main(argc, argv, flags));
	}