1 /* $OpenBSD: cmd-new-session.c,v 1.96 2017/01/13 11:56:43 nicm Exp $ */ 2 3 /* 4 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER 15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 21 #include <errno.h> 22 #include <fcntl.h> 23 #include <stdlib.h> 24 #include <string.h> 25 #include <termios.h> 26 #include <unistd.h> 27 28 #include "tmux.h" 29 30 /* 31 * Create a new session and attach to the current terminal unless -d is given. 32 */ 33 34 #define NEW_SESSION_TEMPLATE "#{session_name}:" 35 36 static enum cmd_retval cmd_new_session_exec(struct cmd *, struct cmdq_item *); 37 38 const struct cmd_entry cmd_new_session_entry = { 39 .name = "new-session", 40 .alias = "new", 41 42 .args = { "Ac:dDEF:n:Ps:t:x:y:", 0, -1 }, 43 .usage = "[-AdDEP] [-c start-directory] [-F format] [-n window-name] " 44 "[-s session-name] " CMD_TARGET_SESSION_USAGE " [-x width] " 45 "[-y height] [command]", 46 47 .tflag = CMD_SESSION_CANFAIL, 48 49 .flags = CMD_STARTSERVER, 50 .exec = cmd_new_session_exec 51 }; 52 53 const struct cmd_entry cmd_has_session_entry = { 54 .name = "has-session", 55 .alias = "has", 56 57 .args = { "t:", 0, 0 }, 58 .usage = CMD_TARGET_SESSION_USAGE, 59 60 .tflag = CMD_SESSION, 61 62 .flags = 0, 63 .exec = cmd_new_session_exec 64 }; 65 66 static enum cmd_retval 67 cmd_new_session_exec(struct cmd *self, struct cmdq_item *item) 68 { 69 struct args *args = self->args; 70 struct client *c = item->client; 71 struct session *s, *as; 72 struct session *groupwith = item->state.tflag.s; 73 struct window *w; 74 struct environ *env; 75 struct termios tio, *tiop; 76 const char *newname, *target, *update, *errstr, *template; 77 const char *path, *cmd, *cwd, *to_free = NULL; 78 char **argv, *cause, *cp; 79 int detached, already_attached, idx, argc; 80 u_int sx, sy; 81 struct format_tree *ft; 82 struct environ_entry *envent; 83 struct cmd_find_state fs; 84 85 if (self->entry == &cmd_has_session_entry) { 86 /* 87 * cmd_prepare() will fail if the session cannot be found, 88 * hence always return success here. 89 */ 90 return (CMD_RETURN_NORMAL); 91 } 92 93 if (args_has(args, 't') && (args->argc != 0 || args_has(args, 'n'))) { 94 cmdq_error(item, "command or window name given with target"); 95 return (CMD_RETURN_ERROR); 96 } 97 98 newname = args_get(args, 's'); 99 if (newname != NULL) { 100 if (!session_check_name(newname)) { 101 cmdq_error(item, "bad session name: %s", newname); 102 return (CMD_RETURN_ERROR); 103 } 104 if ((as = session_find(newname)) != NULL) { 105 if (args_has(args, 'A')) { 106 /* 107 * This item is now destined for 108 * attach-session. Because attach-session will 109 * have already been prepared, copy this 110 * session into its tflag so it can be used. 111 */ 112 cmd_find_from_session(&item->state.tflag, as); 113 return (cmd_attach_session(item, 114 args_has(args, 'D'), 0, NULL, 115 args_has(args, 'E'))); 116 } 117 cmdq_error(item, "duplicate session: %s", newname); 118 return (CMD_RETURN_ERROR); 119 } 120 } 121 122 if ((target = args_get(args, 't')) != NULL) { 123 if (groupwith == NULL) { 124 cmdq_error(item, "no such session: %s", target); 125 goto error; 126 } 127 } else 128 groupwith = NULL; 129 130 /* Set -d if no client. */ 131 detached = args_has(args, 'd'); 132 if (c == NULL) 133 detached = 1; 134 135 /* Is this client already attached? */ 136 already_attached = 0; 137 if (c != NULL && c->session != NULL) 138 already_attached = 1; 139 140 /* Get the new session working directory. */ 141 if (args_has(args, 'c')) { 142 ft = format_create(item, 0); 143 format_defaults(ft, c, NULL, NULL, NULL); 144 to_free = cwd = format_expand(ft, args_get(args, 'c')); 145 format_free(ft); 146 } else if (c != NULL && c->session == NULL && c->cwd != NULL) 147 cwd = c->cwd; 148 else 149 cwd = "."; 150 151 /* 152 * If this is a new client, check for nesting and save the termios 153 * settings (part of which is used for new windows in this session). 154 * 155 * tcgetattr() is used rather than using tty.tio since if the client is 156 * detached, tty_open won't be called. It must be done before opening 157 * the terminal as that calls tcsetattr() to prepare for tmux taking 158 * over. 159 */ 160 if (!detached && !already_attached && c->tty.fd != -1) { 161 if (server_client_check_nested(item->client)) { 162 cmdq_error(item, "sessions should be nested with care, " 163 "unset $TMUX to force"); 164 return (CMD_RETURN_ERROR); 165 } 166 if (tcgetattr(c->tty.fd, &tio) != 0) 167 fatal("tcgetattr failed"); 168 tiop = &tio; 169 } else 170 tiop = NULL; 171 172 /* Open the terminal if necessary. */ 173 if (!detached && !already_attached) { 174 if (server_client_open(c, &cause) != 0) { 175 cmdq_error(item, "open terminal failed: %s", cause); 176 free(cause); 177 goto error; 178 } 179 } 180 181 /* Find new session size. */ 182 if (c != NULL) { 183 sx = c->tty.sx; 184 sy = c->tty.sy; 185 } else { 186 sx = 80; 187 sy = 24; 188 } 189 if (detached && args_has(args, 'x')) { 190 sx = strtonum(args_get(args, 'x'), 1, USHRT_MAX, &errstr); 191 if (errstr != NULL) { 192 cmdq_error(item, "width %s", errstr); 193 goto error; 194 } 195 } 196 if (detached && args_has(args, 'y')) { 197 sy = strtonum(args_get(args, 'y'), 1, USHRT_MAX, &errstr); 198 if (errstr != NULL) { 199 cmdq_error(item, "height %s", errstr); 200 goto error; 201 } 202 } 203 if (sy > 0 && options_get_number(global_s_options, "status")) 204 sy--; 205 if (sx == 0) 206 sx = 1; 207 if (sy == 0) 208 sy = 1; 209 210 /* Figure out the command for the new window. */ 211 argc = -1; 212 argv = NULL; 213 if (!args_has(args, 't') && args->argc != 0) { 214 argc = args->argc; 215 argv = args->argv; 216 } else if (groupwith == NULL) { 217 cmd = options_get_string(global_s_options, "default-command"); 218 if (cmd != NULL && *cmd != '\0') { 219 argc = 1; 220 argv = (char **)&cmd; 221 } else { 222 argc = 0; 223 argv = NULL; 224 } 225 } 226 227 path = NULL; 228 if (c != NULL && c->session == NULL) 229 envent = environ_find(c->environ, "PATH"); 230 else 231 envent = environ_find(global_environ, "PATH"); 232 if (envent != NULL) 233 path = envent->value; 234 235 /* Construct the environment. */ 236 env = environ_create(); 237 if (c != NULL && !args_has(args, 'E')) { 238 update = options_get_string(global_s_options, 239 "update-environment"); 240 environ_update(update, c->environ, env); 241 } 242 243 /* Create the new session. */ 244 idx = -1 - options_get_number(global_s_options, "base-index"); 245 s = session_create(newname, argc, argv, path, cwd, env, tiop, idx, sx, 246 sy, &cause); 247 environ_free(env); 248 if (s == NULL) { 249 cmdq_error(item, "create session failed: %s", cause); 250 free(cause); 251 goto error; 252 } 253 254 /* Set the initial window name if one given. */ 255 if (argc >= 0 && args_has(args, 'n')) { 256 w = s->curw->window; 257 window_set_name(w, args_get(args, 'n')); 258 options_set_number(w->options, "automatic-rename", 0); 259 } 260 261 /* 262 * If a target session is given, this is to be part of a session group, 263 * so add it to the group and synchronize. 264 */ 265 if (groupwith != NULL) { 266 session_group_add(groupwith, s); 267 session_group_synchronize_to(s); 268 session_select(s, RB_MIN(winlinks, &s->windows)->idx); 269 } 270 notify_session("session-created", s); 271 272 /* 273 * Set the client to the new session. If a command client exists, it is 274 * taking this session and needs to get MSG_READY and stay around. 275 */ 276 if (!detached) { 277 if (!already_attached) { 278 if (~c->flags & CLIENT_CONTROL) 279 proc_send(c->peer, MSG_READY, -1, NULL, 0); 280 } else if (c->session != NULL) 281 c->last_session = c->session; 282 c->session = s; 283 server_client_set_key_table(c, NULL); 284 status_timer_start(c); 285 notify_client("client-session-changed", c); 286 session_update_activity(s, NULL); 287 gettimeofday(&s->last_attached_time, NULL); 288 server_redraw_client(c); 289 } 290 recalculate_sizes(); 291 server_update_socket(); 292 293 /* 294 * If there are still configuration file errors to display, put the new 295 * session's current window into more mode and display them now. 296 */ 297 if (cfg_finished) 298 cfg_show_causes(s); 299 300 /* Print if requested. */ 301 if (args_has(args, 'P')) { 302 if ((template = args_get(args, 'F')) == NULL) 303 template = NEW_SESSION_TEMPLATE; 304 305 ft = format_create(item, 0); 306 format_defaults(ft, c, s, NULL, NULL); 307 308 cp = format_expand(ft, template); 309 cmdq_print(item, "%s", cp); 310 free(cp); 311 312 format_free(ft); 313 } 314 315 if (!detached) 316 c->flags |= CLIENT_ATTACHED; 317 318 if (to_free != NULL) 319 free((void *)to_free); 320 321 cmd_find_from_session(&fs, s); 322 hooks_insert(s->hooks, item, &fs, "after-new-session"); 323 324 return (CMD_RETURN_NORMAL); 325 326 error: 327 if (to_free != NULL) 328 free((void *)to_free); 329 return (CMD_RETURN_ERROR); 330 } 331