tmux.c - tmux - Rivoreo Source Code Repositories

 /* $Id: tmux.c,v 1.105 2009-02-08 16:11:26 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 <errno.h>
 #include <pwd.h>
 #include <signal.h>
 #include <stdlib.h>
 #include <string.h>
 #include <syslog.h>
 #include <unistd.h>

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

 #include "tmux.h"

 #ifdef DEBUG
 /* DragonFly uses an OpenBSD-like malloc() since 1.6 */
 #if defined(__OpenBSD__) || defined(__DragonFly__)
 const char	*malloc_options = "AFGJPX";
 #endif
 #ifdef __FreeBSD__
 const char	*_malloc_options = "AJX";
 #endif
 #endif

 volatile sig_atomic_t sigwinch;
 volatile sig_atomic_t sigterm;
 volatile sig_atomic_t sigcont;
 volatile sig_atomic_t sigchld;

 char		*cfg_file;
 struct options	 global_options;
 struct options	 global_window_options;

 int		 server_locked;
 char		*server_password;
 time_t		 server_activity;

 int		 debug_level;
 int		 be_quiet;
 time_t		 start_time;
 const char	*socket_path;

 __dead void	 usage(void);

 #ifdef NO_PROGNAME
 const char      *__progname = "tmux";
 #endif

 __dead void
 usage(void)
 {
 	fprintf(stderr, "usage: "
 	    "%s [-2dquVv] [-f file] [-S socket-path] [command [flags]]\n",
 	    __progname);
 	exit(1);
 }

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

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

 void
 sighandler(int sig)
 {
 	int	saved_errno;

 	saved_errno = errno;
 	switch (sig) {
 	case SIGWINCH:
 		sigwinch = 1;
 		break;
 	case SIGTERM:
 		sigterm = 1;
 		break;
 	case SIGCHLD:
 		sigchld = 1;
 		break;
 	case SIGCONT:
 		sigcont = 1;
 		break;
 	}
 	errno = saved_errno;
 }

 void
 siginit(void)
 {
 	struct sigaction	 act;

 	memset(&act, 0, sizeof act);
 	sigemptyset(&act.sa_mask);
 	act.sa_flags = SA_RESTART;

 	act.sa_handler = SIG_IGN;
 	if (sigaction(SIGPIPE, &act, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGUSR1, &act, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGUSR2, &act, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGINT, &act, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGTSTP, &act, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGQUIT, &act, NULL) != 0)
 		fatal("sigaction failed");

 	act.sa_handler = sighandler;
 	if (sigaction(SIGWINCH, &act, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGTERM, &act, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGCHLD, &act, NULL) != 0)
 		fatal("sigaction failed");
 }

 void
 sigreset(void)
 {
 	struct sigaction act;

 	memset(&act, 0, sizeof act);
 	sigemptyset(&act.sa_mask);

 	act.sa_handler = SIG_DFL;
 	if (sigaction(SIGPIPE, &act, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGUSR1, &act, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGUSR2, &act, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGINT, &act, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGTSTP, &act, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGQUIT, &act, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGWINCH, &act, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGTERM, &act, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGCHLD, &act, NULL) != 0)
 		fatal("sigaction failed");
 }

 int
 main(int argc, char **argv)
 {
 	struct client_ctx	 cctx;
 	struct msg_command_data	 cmddata;
 	struct buffer		*b;
 	struct cmd_list		*cmdlist;
  	struct cmd		*cmd;
 	struct pollfd	 	 pfd;
 	struct hdr	 	 hdr;
 	const char		*shell;
 	struct passwd		*pw;
 	char			*path, *cause, *home, *pass = NULL;
 	char			 rpath[MAXPATHLEN], cwd[MAXPATHLEN];
 	int	 		 retcode, opt, flags, unlock, start_server;

 	unlock = flags = 0;
 	path = NULL;
         while ((opt = getopt(argc, argv, "2df:qS:uUVv")) != -1) {
                 switch (opt) {
 		case '2':
 			flags |= IDENTIFY_256COLOURS;
 			break;
 		case 'f':
 			cfg_file = xstrdup(optarg);
 			break;
 		case 'S':
 			path = xstrdup(optarg);
 			break;
 		case 'q':
 			be_quiet = 1;
 			break;
 		case 'u':
 			flags |= IDENTIFY_UTF8;
 			break;
 		case 'U':
 			unlock = 1;
 			break;
 		case 'd':
 			flags |= IDENTIFY_HASDEFAULTS;
 			break;
 		case 'v':
 			debug_level++;
 			break;
 		case 'V':
 			printf("%s " BUILD "\n", __progname);
 			exit(0);
                 default:
 			usage();
                 }
         }
 	argc -= optind;
 	argv += optind;

 	log_open_tty(debug_level);
 	siginit();

 	options_init(&global_options, NULL);
 	options_set_number(&global_options, "bell-action", BELL_ANY);
 	options_set_number(&global_options, "buffer-limit", 9);
 	options_set_number(&global_options, "display-time", 750);
 	options_set_number(&global_options, "history-limit", 2000);
 	options_set_number(&global_options, "message-bg", 3);
 	options_set_number(&global_options, "message-fg", 0);
 	options_set_number(&global_options, "message-attr", GRID_ATTR_REVERSE);
 	options_set_number(&global_options, "prefix", META);
 	options_set_number(&global_options, "repeat-time", 500);
 	options_set_number(&global_options, "set-titles", 1);
 	options_set_number(&global_options, "lock-after-time", 0);
 	options_set_number(&global_options, "status", 1);
 	options_set_number(&global_options, "status-bg", 2);
 	options_set_number(&global_options, "status-fg", 0);
 	options_set_number(&global_options, "status-attr", GRID_ATTR_REVERSE);
 	options_set_number(&global_options, "status-interval", 15);
 	options_set_number(&global_options, "status-left-length", 10);
 	options_set_number(&global_options, "status-right-length", 40);
 	options_set_string(&global_options, "status-left", "[#S]");
 	options_set_string(
 	    &global_options, "status-right", "\"#24T\" %%H:%%M %%d-%%b-%%y");
 	options_init(&global_window_options, NULL);
 	options_set_number(&global_window_options, "aggressive-resize", 0);
 	options_set_number(&global_window_options, "clock-mode-colour", 4);
 	options_set_number(&global_window_options, "clock-mode-style", 1);
 	options_set_number(&global_window_options, "force-height", 0);
 	options_set_number(&global_window_options, "force-width", 0);
 	options_set_number(&global_window_options, "automatic-rename", 1);
 	options_set_number(&global_window_options, "mode-bg", 3);
 	options_set_number(&global_window_options, "mode-fg", 0);
 	options_set_number(
 	    &global_window_options, "mode-attr", GRID_ATTR_REVERSE);
 	options_set_number(&global_window_options, "mode-keys", MODEKEY_EMACS);
 	options_set_number(&global_window_options, "monitor-activity", 0);
 	options_set_number(&global_window_options, "utf8", 0);
 	options_set_number(&global_window_options, "xterm-keys", 0);
  	options_set_number(&global_window_options, "remain-on-exit", 0);
 	options_set_number(&global_window_options, "window-status-bg", 8);
 	options_set_number(&global_window_options, "window-status-fg", 8);
 	options_set_number(&global_window_options, "window-status-attr", 0);

 	if (cfg_file == NULL) {
 		home = getenv("HOME");
 		if (home == NULL || *home == '\0') {
 			pw = getpwuid(getuid());
 			if (pw != NULL)
 				home = pw->pw_dir;
 			endpwent();
 		}
 		xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG);
 		if (access(cfg_file, R_OK) != 0) {
 			xfree(cfg_file);
 			cfg_file = NULL;
 		}
 	} else {
 		if (access(cfg_file, R_OK) != 0) {
 			log_warn("%s", cfg_file);
 			exit(1);
 		}
 	}

 	if (path == NULL) {
 		xasprintf(&path,
 		    "%s/%s-%lu", _PATH_TMP, __progname, (u_long) getuid());
 	}
 	if (realpath(path, rpath) == NULL) {
 		if (errno != ENOENT) {
 			log_warn("%s", path);
 			exit(1);
 		}
 		/*
 		 * Linux appears to fill in the buffer fine but then returns
 		 * ENOENT if the file doesn't exist. But since it returns an
 		 * error, we can't rely on the buffer. Grr.
 		 */
 		if (strlcpy(rpath, path, sizeof rpath) >= sizeof rpath) {
 			log_warnx("%s: %s", path, strerror(ENAMETOOLONG));
 			exit(1);
 		}
 	}
 	xfree(path);

 	shell = getenv("SHELL");
 	if (shell == NULL || *shell == '\0') {
 		pw = getpwuid(getuid());
 		if (pw != NULL)
 			shell = pw->pw_shell;
 		endpwent();
 		if (shell == NULL || *shell == '\0')
 			shell = _PATH_BSHELL;
 	}
 	options_set_string(
 	    &global_options, "default-command", "exec %s", shell);


 	if (getcwd(cwd, sizeof cwd) == NULL) {
 		log_warn("getcwd");
 		exit(1);
 	}
 	options_set_string(&global_options, "default-path", "%s", cwd);

 	if (unlock) {
 		if (argc != 0) {
 			log_warnx("can't specify a command when unlocking");
 			exit(1);
 		}
 		cmdlist = NULL;
 		if ((pass = getpass("Password: ")) == NULL)
 			exit(1);
 		start_server = 0;
 	} else {
 		if (argc == 0) {
 			cmd = xmalloc(sizeof *cmd);
 			cmd->entry = &cmd_new_session_entry;
 			cmd->entry->init(cmd, 0);

 			cmdlist = xmalloc(sizeof *cmdlist);
 			TAILQ_INIT(cmdlist);
 			TAILQ_INSERT_HEAD(cmdlist, cmd, qentry);
 		} else {
 			cmdlist = cmd_list_parse(argc, argv, &cause);
 			if (cmdlist == NULL) {
 				log_warnx("%s", cause);
 				exit(1);
 			}
 		}
 		start_server = 0;
 		TAILQ_FOREACH(cmd, cmdlist, qentry) {
 			if (cmd->entry->flags & CMD_STARTSERVER) {
 				start_server = 1;
 				break;
 			}
 		}
 	}

  	memset(&cctx, 0, sizeof cctx);
 	if (client_init(rpath, &cctx, start_server, flags) != 0)
 		exit(1);

 	b = buffer_create(BUFSIZ);
 	if (unlock) {
 		cmd_send_string(b, pass);
 		client_write_server(
 		    &cctx, MSG_UNLOCK, BUFFER_OUT(b), BUFFER_USED(b));
 	} else {
 		cmd_list_send(cmdlist, b);
 		cmd_list_free(cmdlist);
 		client_fill_session(&cmddata);
 		client_write_server2(&cctx, MSG_COMMAND,
 		    &cmddata, sizeof cmddata, BUFFER_OUT(b), BUFFER_USED(b));
 	}
 	buffer_destroy(b);

 	retcode = 0;
 	for (;;) {
 		pfd.fd = cctx.srv_fd;
 		pfd.events = POLLIN;
 		if (BUFFER_USED(cctx.srv_out) > 0)
 			pfd.events |= POLLOUT;

 		if (poll(&pfd, 1, INFTIM) == -1) {
 			if (errno == EAGAIN || errno == EINTR)
 				continue;
 			fatal("poll failed");
 		}

 		if (buffer_poll(&pfd, cctx.srv_in, cctx.srv_out) != 0)
 			fatalx("lost server");

 	restart:
 		if (BUFFER_USED(cctx.srv_in) < sizeof hdr)
 			continue;
 		memcpy(&hdr, BUFFER_OUT(cctx.srv_in), sizeof hdr);
 		if (BUFFER_USED(cctx.srv_in) < (sizeof hdr) + hdr.size)
 			continue;
 		buffer_remove(cctx.srv_in, sizeof hdr);

 		switch (hdr.type) {
 		case MSG_EXIT:
 		case MSG_SHUTDOWN:
 			goto out;
 		case MSG_ERROR:
 			retcode = 1;
 			/* FALLTHROUGH */
 		case MSG_PRINT:
 			if (hdr.size > INT_MAX - 1)
 				fatalx("bad MSG_PRINT size");
 			log_info("%.*s",
 			    (int) hdr.size, BUFFER_OUT(cctx.srv_in));
 			if (hdr.size != 0)
 				buffer_remove(cctx.srv_in, hdr.size);
 			goto restart;
 		case MSG_READY:
 			retcode = client_main(&cctx);
 			goto out;
 		default:
 			fatalx("unexpected command");
 		}
 	}

 out:
 	options_free(&global_options);
 	options_free(&global_window_options);

 	close(cctx.srv_fd);
 	buffer_destroy(cctx.srv_in);
 	buffer_destroy(cctx.srv_out);

 #ifdef DEBUG
 	xmalloc_report(getpid(), "client");
 #endif
 	return (retcode);
 }
	/* $Id: tmux.c,v 1.105 2009-02-08 16:11:26 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 <errno.h>
	#include <pwd.h>
	#include <signal.h>
	#include <stdlib.h>
	#include <string.h>
	#include <syslog.h>
	#include <unistd.h>

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

	#include "tmux.h"

	#ifdef DEBUG
	/* DragonFly uses an OpenBSD-like malloc() since 1.6 */
	#if defined(__OpenBSD__) \|\| defined(__DragonFly__)
	const char *malloc_options = "AFGJPX";
	#endif
	#ifdef __FreeBSD__
	const char *_malloc_options = "AJX";
	#endif
	#endif

	volatile sig_atomic_t sigwinch;
	volatile sig_atomic_t sigterm;
	volatile sig_atomic_t sigcont;
	volatile sig_atomic_t sigchld;

	char *cfg_file;
	struct options global_options;
	struct options global_window_options;

	int server_locked;
	char *server_password;
	time_t server_activity;

	int debug_level;
	int be_quiet;
	time_t start_time;
	const char *socket_path;

	__dead void usage(void);

	#ifdef NO_PROGNAME
	const char *__progname = "tmux";
	#endif

	__dead void
	usage(void)
	{
	fprintf(stderr, "usage: "
	"%s [-2dquVv] [-f file] [-S socket-path] [command [flags]]\n",
	__progname);
	exit(1);
	}

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

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

	void
	sighandler(int sig)
	{
	int saved_errno;

	saved_errno = errno;
	switch (sig) {
	case SIGWINCH:
	sigwinch = 1;
	break;
	case SIGTERM:
	sigterm = 1;
	break;
	case SIGCHLD:
	sigchld = 1;
	break;
	case SIGCONT:
	sigcont = 1;
	break;
	}
	errno = saved_errno;
	}

	void
	siginit(void)
	{
	struct sigaction act;

	memset(&act, 0, sizeof act);
	sigemptyset(&act.sa_mask);
	act.sa_flags = SA_RESTART;

	act.sa_handler = SIG_IGN;
	if (sigaction(SIGPIPE, &act, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGUSR1, &act, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGUSR2, &act, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGINT, &act, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGTSTP, &act, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGQUIT, &act, NULL) != 0)
	fatal("sigaction failed");

	act.sa_handler = sighandler;
	if (sigaction(SIGWINCH, &act, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGTERM, &act, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGCHLD, &act, NULL) != 0)
	fatal("sigaction failed");
	}

	void
	sigreset(void)
	{
	struct sigaction act;

	memset(&act, 0, sizeof act);
	sigemptyset(&act.sa_mask);

	act.sa_handler = SIG_DFL;
	if (sigaction(SIGPIPE, &act, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGUSR1, &act, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGUSR2, &act, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGINT, &act, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGTSTP, &act, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGQUIT, &act, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGWINCH, &act, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGTERM, &act, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGCHLD, &act, NULL) != 0)
	fatal("sigaction failed");
	}

	int
	main(int argc, char **argv)
	{
	struct client_ctx cctx;
	struct msg_command_data cmddata;
	struct buffer *b;
	struct cmd_list *cmdlist;
	struct cmd *cmd;
	struct pollfd pfd;
	struct hdr hdr;
	const char *shell;
	struct passwd *pw;
	char path, cause, home, pass = NULL;
	char rpath[MAXPATHLEN], cwd[MAXPATHLEN];
	int retcode, opt, flags, unlock, start_server;

	unlock = flags = 0;
	path = NULL;
	while ((opt = getopt(argc, argv, "2df:qS:uUVv")) != -1) {
	switch (opt) {
	case '2':
	flags \|= IDENTIFY_256COLOURS;
	break;
	case 'f':
	cfg_file = xstrdup(optarg);
	break;
	case 'S':
	path = xstrdup(optarg);
	break;
	case 'q':
	be_quiet = 1;
	break;
	case 'u':
	flags \|= IDENTIFY_UTF8;
	break;
	case 'U':
	unlock = 1;
	break;
	case 'd':
	flags \|= IDENTIFY_HASDEFAULTS;
	break;
	case 'v':
	debug_level++;
	break;
	case 'V':
	printf("%s " BUILD "\n", __progname);
	exit(0);
	default:
	usage();
	}
	}
	argc -= optind;
	argv += optind;

	log_open_tty(debug_level);
	siginit();

	options_init(&global_options, NULL);
	options_set_number(&global_options, "bell-action", BELL_ANY);
	options_set_number(&global_options, "buffer-limit", 9);
	options_set_number(&global_options, "display-time", 750);
	options_set_number(&global_options, "history-limit", 2000);
	options_set_number(&global_options, "message-bg", 3);
	options_set_number(&global_options, "message-fg", 0);
	options_set_number(&global_options, "message-attr", GRID_ATTR_REVERSE);
	options_set_number(&global_options, "prefix", META);
	options_set_number(&global_options, "repeat-time", 500);
	options_set_number(&global_options, "set-titles", 1);
	options_set_number(&global_options, "lock-after-time", 0);
	options_set_number(&global_options, "status", 1);
	options_set_number(&global_options, "status-bg", 2);
	options_set_number(&global_options, "status-fg", 0);
	options_set_number(&global_options, "status-attr", GRID_ATTR_REVERSE);
	options_set_number(&global_options, "status-interval", 15);
	options_set_number(&global_options, "status-left-length", 10);
	options_set_number(&global_options, "status-right-length", 40);
	options_set_string(&global_options, "status-left", "[#S]");
	options_set_string(
	&global_options, "status-right", "\"#24T\" %%H:%%M %%d-%%b-%%y");
	options_init(&global_window_options, NULL);
	options_set_number(&global_window_options, "aggressive-resize", 0);
	options_set_number(&global_window_options, "clock-mode-colour", 4);
	options_set_number(&global_window_options, "clock-mode-style", 1);
	options_set_number(&global_window_options, "force-height", 0);
	options_set_number(&global_window_options, "force-width", 0);
	options_set_number(&global_window_options, "automatic-rename", 1);
	options_set_number(&global_window_options, "mode-bg", 3);
	options_set_number(&global_window_options, "mode-fg", 0);
	options_set_number(
	&global_window_options, "mode-attr", GRID_ATTR_REVERSE);
	options_set_number(&global_window_options, "mode-keys", MODEKEY_EMACS);
	options_set_number(&global_window_options, "monitor-activity", 0);
	options_set_number(&global_window_options, "utf8", 0);
	options_set_number(&global_window_options, "xterm-keys", 0);
	options_set_number(&global_window_options, "remain-on-exit", 0);
	options_set_number(&global_window_options, "window-status-bg", 8);
	options_set_number(&global_window_options, "window-status-fg", 8);
	options_set_number(&global_window_options, "window-status-attr", 0);

	if (cfg_file == NULL) {
	home = getenv("HOME");
	if (home == NULL \|\| *home == '\0') {
	pw = getpwuid(getuid());
	if (pw != NULL)
	home = pw->pw_dir;
	endpwent();
	}
	xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG);
	if (access(cfg_file, R_OK) != 0) {
	xfree(cfg_file);
	cfg_file = NULL;
	}
	} else {
	if (access(cfg_file, R_OK) != 0) {
	log_warn("%s", cfg_file);
	exit(1);
	}
	}

	if (path == NULL) {
	xasprintf(&path,
	"%s/%s-%lu", _PATH_TMP, __progname, (u_long) getuid());
	}
	if (realpath(path, rpath) == NULL) {
	if (errno != ENOENT) {
	log_warn("%s", path);
	exit(1);
	}
	/*
	* Linux appears to fill in the buffer fine but then returns
	* ENOENT if the file doesn't exist. But since it returns an
	* error, we can't rely on the buffer. Grr.
	*/
	if (strlcpy(rpath, path, sizeof rpath) >= sizeof rpath) {
	log_warnx("%s: %s", path, strerror(ENAMETOOLONG));
	exit(1);
	}
	}
	xfree(path);

	shell = getenv("SHELL");
	if (shell == NULL \|\| *shell == '\0') {
	pw = getpwuid(getuid());
	if (pw != NULL)
	shell = pw->pw_shell;
	endpwent();
	if (shell == NULL \|\| *shell == '\0')
	shell = _PATH_BSHELL;
	}
	options_set_string(
	&global_options, "default-command", "exec %s", shell);


	if (getcwd(cwd, sizeof cwd) == NULL) {
	log_warn("getcwd");
	exit(1);
	}
	options_set_string(&global_options, "default-path", "%s", cwd);

	if (unlock) {
	if (argc != 0) {
	log_warnx("can't specify a command when unlocking");
	exit(1);
	}
	cmdlist = NULL;
	if ((pass = getpass("Password: ")) == NULL)
	exit(1);
	start_server = 0;
	} else {
	if (argc == 0) {
	cmd = xmalloc(sizeof *cmd);
	cmd->entry = &cmd_new_session_entry;
	cmd->entry->init(cmd, 0);

	cmdlist = xmalloc(sizeof *cmdlist);
	TAILQ_INIT(cmdlist);
	TAILQ_INSERT_HEAD(cmdlist, cmd, qentry);
	} else {
	cmdlist = cmd_list_parse(argc, argv, &cause);
	if (cmdlist == NULL) {
	log_warnx("%s", cause);
	exit(1);
	}
	}
	start_server = 0;
	TAILQ_FOREACH(cmd, cmdlist, qentry) {
	if (cmd->entry->flags & CMD_STARTSERVER) {
	start_server = 1;
	break;
	}
	}
	}

	memset(&cctx, 0, sizeof cctx);
	if (client_init(rpath, &cctx, start_server, flags) != 0)
	exit(1);

	b = buffer_create(BUFSIZ);
	if (unlock) {
	cmd_send_string(b, pass);
	client_write_server(
	&cctx, MSG_UNLOCK, BUFFER_OUT(b), BUFFER_USED(b));
	} else {
	cmd_list_send(cmdlist, b);
	cmd_list_free(cmdlist);
	client_fill_session(&cmddata);
	client_write_server2(&cctx, MSG_COMMAND,
	&cmddata, sizeof cmddata, BUFFER_OUT(b), BUFFER_USED(b));
	}
	buffer_destroy(b);

	retcode = 0;
	for (;;) {
	pfd.fd = cctx.srv_fd;
	pfd.events = POLLIN;
	if (BUFFER_USED(cctx.srv_out) > 0)
	pfd.events \|= POLLOUT;

	if (poll(&pfd, 1, INFTIM) == -1) {
	if (errno == EAGAIN \|\| errno == EINTR)
	continue;
	fatal("poll failed");
	}

	if (buffer_poll(&pfd, cctx.srv_in, cctx.srv_out) != 0)
	fatalx("lost server");

	restart:
	if (BUFFER_USED(cctx.srv_in) < sizeof hdr)
	continue;
	memcpy(&hdr, BUFFER_OUT(cctx.srv_in), sizeof hdr);
	if (BUFFER_USED(cctx.srv_in) < (sizeof hdr) + hdr.size)
	continue;
	buffer_remove(cctx.srv_in, sizeof hdr);

	switch (hdr.type) {
	case MSG_EXIT:
	case MSG_SHUTDOWN:
	goto out;
	case MSG_ERROR:
	retcode = 1;
	/* FALLTHROUGH */
	case MSG_PRINT:
	if (hdr.size > INT_MAX - 1)
	fatalx("bad MSG_PRINT size");
	log_info("%.*s",
	(int) hdr.size, BUFFER_OUT(cctx.srv_in));
	if (hdr.size != 0)
	buffer_remove(cctx.srv_in, hdr.size);
	goto restart;
	case MSG_READY:
	retcode = client_main(&cctx);
	goto out;
	default:
	fatalx("unexpected command");
	}
	}

	out:
	options_free(&global_options);
	options_free(&global_window_options);

	close(cctx.srv_fd);
	buffer_destroy(cctx.srv_in);
	buffer_destroy(cctx.srv_out);

	#ifdef DEBUG
	xmalloc_report(getpid(), "client");
	#endif
	return (retcode);
	}