cmd-attach-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 "tmux.h"
  22
  23 /*
  24  * Attach existing session to the current terminal.
  25  */
  26
  27 int     cmd_attach_session_exec(struct cmd *, struct cmd_ctx *);
  28
  29 const struct cmd_entry cmd_attach_session_entry = {
  30         "attach-session", "attach",
  31         "drt:", 0, 0,
  32         "[-dr] " CMD_TARGET_SESSION_USAGE,
  33         CMD_CANTNEST|CMD_STARTSERVER|CMD_SENDENVIRON,
  34         NULL,
  35         NULL,
  36         cmd_attach_session_exec
  37 };
  38
  39 int
  40 cmd_attach_session_exec(struct cmd *self, struct cmd_ctx *ctx)
  41 {
  42         struct args     *args = self->args;
  43         struct session  *s;
  44         struct client   *c;
  45         const char      *update;
  46         char            *overrides, *cause;
  47         u_int            i;
  48
  49         if (RB_EMPTY(&sessions)) {
  50                 ctx->error(ctx, "no sessions");
  51                 return (-1);
  52         }
  53
  54         if ((s = cmd_find_session(ctx, args_get(args, 't'), 1)) == NULL)
  55                 return (-1);
  56
  57         if (ctx->cmdclient == NULL && ctx->curclient == NULL)
  58                 return (0);
  59
  60         if (ctx->cmdclient == NULL) {
  61                 if (args_has(self->args, 'd')) {
  62                         /*
  63                          * Can't use server_write_session in case attaching to
  64                          * the same session as currently attached to.
  65                          */
  66                         for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
  67                                 c = ARRAY_ITEM(&clients, i);
  68                                 if (c == NULL || c->session != s)
  69                                         continue;
  70                                 if (c == ctx->curclient)
  71                                         continue;
  72                                 server_write_client(c, MSG_DETACH, NULL, 0);
  73                         }
  74                 }
  75
  76                 ctx->curclient->session = s;
  77                 session_update_activity(s);
  78                 server_redraw_client(ctx->curclient);
  79         } else {
  80                 if (!(ctx->cmdclient->flags & CLIENT_TERMINAL)) {
  81                         ctx->error(ctx, "not a terminal");
  82                         return (-1);
  83                 }
  84
  85                 overrides =
  86                     options_get_string(&s->options, "terminal-overrides");
  87                 if (tty_open(&ctx->cmdclient->tty, overrides, &cause) != 0) {
  88                         ctx->error(ctx, "terminal open failed: %s", cause);
  89                         xfree(cause);
  90                         return (-1);
  91                 }
  92
  93                 if (args_has(self->args, 'r'))
  94                         ctx->cmdclient->flags |= CLIENT_READONLY;
  95
  96                 if (args_has(self->args, 'd'))
  97                         server_write_session(s, MSG_DETACH, NULL, 0);
  98
  99                 ctx->cmdclient->session = s;
 100                 session_update_activity(s);
 101                 server_write_client(ctx->cmdclient, MSG_READY, NULL, 0);
 102
 103                 update = options_get_string(&s->options, "update-environment");
 104                 environ_update(update, &ctx->cmdclient->environ, &s->environ);
 105
 106                 server_redraw_client(ctx->cmdclient);
 107         }
 108         recalculate_sizes();
 109         server_update_socket();
 110
 111         return (1);     /* 1 means don't tell command client to exit */
 112 }