===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/format.c,v
retrieving revision 1.312
retrieving revision 1.313
diff -c -r1.312 -r1.313
*** src/usr.bin/tmux/format.c	2023/03/27 08:47:57	1.312
--- src/usr.bin/tmux/format.c	2023/05/19 07:46:34	1.313
***************
*** 1,4 ****
! /* $OpenBSD: format.c,v 1.312 2023/03/27 08:47:57 nicm Exp $ */
  
  /*
   * Copyright (c) 2011 Nicholas Marriott <nicholas.marriott@gmail.com>
--- 1,4 ----
! /* $OpenBSD: format.c,v 1.313 2023/05/19 07:46:34 nicm Exp $ */
  
  /*
   * Copyright (c) 2011 Nicholas Marriott <nicholas.marriott@gmail.com>
***************
*** 2077,2082 ****
--- 2077,2094 ----
  	return (NULL);
  }
  
+ /* Callback for server_sessions. */
+ static void *
+ format_cb_server_sessions(__unused struct format_tree *ft)
+ {
+ 	struct session	*s;
+ 	u_int		 n = 0;
+ 
+ 	RB_FOREACH(s, sessions, &sessions)
+ 		n++;
+ 	return (format_printf("%u", n));
+ }
+ 
  /* Callback for session_attached. */
  static void *
  format_cb_session_attached(struct format_tree *ft)
***************
*** 2979,2984 ****
--- 2991,2999 ----
  	},
  	{ "scroll_region_upper", FORMAT_TABLE_STRING,
  	  format_cb_scroll_region_upper
+ 	},
+ 	{ "server_sessions", FORMAT_TABLE_STRING,
+ 	  format_cb_server_sessions
  	},
  	{ "session_activity", FORMAT_TABLE_TIME,
  	  format_cb_session_activity