cmd-new-session.c

   1 /* $OpenBSD$ */
   2
   3 /*
   4  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
   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 <pwd.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <termios.h>
  25 #include <unistd.h>
  26
  27 #include "tmux.h"
  28
  29 /*
  30  * Create a new session and attach to the current terminal unless -d is given.
  31  */
  32
  33 enum cmd_retval  cmd_new_session_check(struct args *);
  34 enum cmd_retval  cmd_new_session_exec(struct cmd *, struct cmd_ctx *);
  35
  36 const struct cmd_entry cmd_new_session_entry = {
  37         "new-session", "new",
  38         "dn:s:t:x:y:", 0, 1,
  39         "[-d] [-n window-name] [-s session-name] " CMD_TARGET_SESSION_USAGE
  40         " [-x width] [-y height] [command]",
  41         CMD_STARTSERVER|CMD_CANTNEST|CMD_SENDENVIRON,
  42         NULL,
  43         cmd_new_session_check,
  44         cmd_new_session_exec
  45 };
  46
  47 enum cmd_retval
  48 cmd_new_session_check(struct args *args)
  49 {
  50         if (args_has(args, 't') && (args->argc != 0 || args_has(args, 'n')))
  51                 return (CMD_RETURN_ERROR);
  52         return (CMD_RETURN_NORMAL);
  53 }
  54
  55 enum cmd_retval
  56 cmd_new_session_exec(struct cmd *self, struct cmd_ctx *ctx)
  57 {
  58         struct args             *args = self->args;
  59         struct session          *s, *old_s, *groupwith;
  60         struct window           *w;
  61         struct environ           env;
  62         struct termios           tio, *tiop;
  63         struct passwd           *pw;
  64         const char              *newname, *target, *update, *cwd, *errstr;
  65         char                    *cmd, *cause;
  66         int                      detached, idx;
  67         u_int                    sx, sy;
  68
  69         newname = args_get(args, 's');
  70         if (newname != NULL) {
  71                 if (!session_check_name(newname)) {
  72                         ctx->error(ctx, "bad session name: %s", newname);
  73                         return (CMD_RETURN_ERROR);
  74                 }
  75                 if (session_find(newname) != NULL) {
  76                         ctx->error(ctx, "duplicate session: %s", newname);
  77                         return (CMD_RETURN_ERROR);
  78                 }
  79         }
  80
  81         target = args_get(args, 't');
  82         if (target != NULL) {
  83                 groupwith = cmd_find_session(ctx, target, 0);
  84                 if (groupwith == NULL)
  85                         return (CMD_RETURN_ERROR);
  86         } else
  87                 groupwith = NULL;
  88
  89         /*
  90          * There are three cases:
  91          *
  92          * 1. If cmdclient is non-NULL, new-session has been called from the
  93          *    command-line - cmdclient is to become a new attached, interactive
  94          *    client. Unless -d is given, the terminal must be opened and then
  95          *    the client sent MSG_READY.
  96          *
  97          * 2. If cmdclient is NULL, new-session has been called from an
  98          *    existing client (such as a key binding).
  99          *
 100          * 3. Both are NULL, the command was in the configuration file. Treat
 101          *    this as if -d was given even if it was not.
 102          *
 103          * In all cases, a new additional session needs to be created and
 104          * (unless -d) set as the current session for the client.
 105          */
 106
 107         /* Set -d if no client. */
 108         detached = args_has(args, 'd');
 109         if (ctx->cmdclient == NULL && ctx->curclient == NULL)
 110                 detached = 1;
 111
 112         /*
 113          * Save the termios settings, part of which is used for new windows in
 114          * this session.
 115          *
 116          * This is read again with tcgetattr() rather than using tty.tio as if
 117          * detached, tty_open won't be called. Because of this, it must be done
 118          * before opening the terminal as that calls tcsetattr() to prepare for
 119          * tmux taking over.
 120          */
 121         if (ctx->cmdclient != NULL && ctx->cmdclient->tty.fd != -1) {
 122                 if (tcgetattr(ctx->cmdclient->tty.fd, &tio) != 0)
 123                         fatal("tcgetattr failed");
 124                 tiop = &tio;
 125         } else
 126                 tiop = NULL;
 127
 128         /* Open the terminal if necessary. */
 129         if (!detached && ctx->cmdclient != NULL) {
 130                 if (server_client_open(ctx->cmdclient, NULL, &cause) != 0) {
 131                         ctx->error(ctx, "open terminal failed: %s", cause);
 132                         free(cause);
 133                         return (CMD_RETURN_ERROR);
 134                 }
 135         }
 136
 137         /* Get the new session working directory. */
 138         if (ctx->cmdclient != NULL && ctx->cmdclient->cwd != NULL)
 139                 cwd = ctx->cmdclient->cwd;
 140         else {
 141                 pw = getpwuid(getuid());
 142                 if (pw->pw_dir != NULL && *pw->pw_dir != '\0')
 143                         cwd = pw->pw_dir;
 144                 else
 145                         cwd = "/";
 146         }
 147
 148         /* Find new session size. */
 149         if (ctx->cmdclient != NULL) {
 150                 sx = ctx->cmdclient->tty.sx;
 151                 sy = ctx->cmdclient->tty.sy;
 152         } else if (ctx->curclient != NULL) {
 153                 sx = ctx->curclient->tty.sx;
 154                 sy = ctx->curclient->tty.sy;
 155         } else {
 156                 sx = 80;
 157                 sy = 24;
 158         }
 159         if (detached) {
 160                 if (args_has(args, 'x')) {
 161                         sx = strtonum(
 162                             args_get(args, 'x'), 1, USHRT_MAX, &errstr);
 163                         if (errstr != NULL) {
 164                                 ctx->error(ctx, "width %s", errstr);
 165                                 return (CMD_RETURN_ERROR);
 166                         }
 167                 }
 168                 if (args_has(args, 'y')) {
 169                         sy = strtonum(
 170                             args_get(args, 'y'), 1, USHRT_MAX, &errstr);
 171                         if (errstr != NULL) {
 172                                 ctx->error(ctx, "height %s", errstr);
 173                                 return (CMD_RETURN_ERROR);
 174                         }
 175                 }
 176         }
 177         if (sy > 0 && options_get_number(&global_s_options, "status"))
 178                 sy--;
 179         if (sx == 0)
 180                 sx = 1;
 181         if (sy == 0)
 182                 sy = 1;
 183
 184         /* Figure out the command for the new window. */
 185         if (target != NULL)
 186                 cmd = NULL;
 187         else if (args->argc != 0)
 188                 cmd = args->argv[0];
 189         else
 190                 cmd = options_get_string(&global_s_options, "default-command");
 191
 192         /* Construct the environment. */
 193         environ_init(&env);
 194         update = options_get_string(&global_s_options, "update-environment");
 195         if (ctx->cmdclient != NULL)
 196                 environ_update(update, &ctx->cmdclient->environ, &env);
 197
 198         /* Create the new session. */
 199         idx = -1 - options_get_number(&global_s_options, "base-index");
 200         s = session_create(newname, cmd, cwd, &env, tiop, idx, sx, sy, &cause);
 201         if (s == NULL) {
 202                 ctx->error(ctx, "create session failed: %s", cause);
 203                 free(cause);
 204                 return (CMD_RETURN_ERROR);
 205         }
 206         environ_free(&env);
 207
 208         /* Set the initial window name if one given. */
 209         if (cmd != NULL && args_has(args, 'n')) {
 210                 w = s->curw->window;
 211
 212                 window_set_name(w, args_get(args, 'n'));
 213
 214                 options_set_number(&w->options, "automatic-rename", 0);
 215         }
 216
 217         /*
 218          * If a target session is given, this is to be part of a session group,
 219          * so add it to the group and synchronize.
 220          */
 221         if (groupwith != NULL) {
 222                 session_group_add(groupwith, s);
 223                 session_group_synchronize_to(s);
 224                 session_select(s, RB_ROOT(&s->windows)->idx);
 225         }
 226
 227         /*
 228          * Set the client to the new session. If a command client exists, it is
 229          * taking this session and needs to get MSG_READY and stay around.
 230          */
 231         if (!detached) {
 232                 if (ctx->cmdclient != NULL) {
 233                         server_write_ready(ctx->cmdclient);
 234
 235                         old_s = ctx->cmdclient->session;
 236                         if (old_s != NULL)
 237                                 ctx->cmdclient->last_session = old_s;
 238                         ctx->cmdclient->session = s;
 239                         notify_attached_session_changed(ctx->cmdclient);
 240                         session_update_activity(s);
 241                         server_redraw_client(ctx->cmdclient);
 242                 } else {
 243                         old_s = ctx->curclient->session;
 244                         if (old_s != NULL)
 245                                 ctx->curclient->last_session = old_s;
 246                         ctx->curclient->session = s;
 247                         notify_attached_session_changed(ctx->curclient);
 248                         session_update_activity(s);
 249                         server_redraw_client(ctx->curclient);
 250                 }
 251         }
 252         recalculate_sizes();
 253         server_update_socket();
 254
 255         /*
 256          * If there are still configuration file errors to display, put the new
 257          * session's current window into more mode and display them now.
 258          */
 259         if (cfg_finished)
 260                 show_cfg_causes(s);
 261
 262         return (detached ? CMD_RETURN_NORMAL : CMD_RETURN_ATTACH);
 263 }