===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/procname.c,v
retrieving revision 1.16
retrieving revision 1.17
diff -c -r1.16 -r1.17
*** src/usr.bin/tmux/procname.c	2016/10/10 21:29:23	1.16
--- src/usr.bin/tmux/procname.c	2020/04/08 11:26:07	1.17
***************
*** 1,4 ****
! /* $OpenBSD: procname.c,v 1.16 2016/10/10 21:29:23 nicm Exp $ */
  
  /*
   * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
--- 1,4 ----
! /* $OpenBSD: procname.c,v 1.17 2020/04/08 11:26:07 nicm Exp $ */
  
  /*
   * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
***************
*** 38,43 ****
--- 38,44 ----
  
  static struct kinfo_proc *cmp_procs(struct kinfo_proc *, struct kinfo_proc *);
  char	*get_proc_name(int, char *);
+ char	*get_proc_cwd(int);
  
  static struct kinfo_proc *
  cmp_procs(struct kinfo_proc *p1, struct kinfo_proc *p2)
***************
*** 131,134 ****
--- 132,149 ----
  error:
  	free(buf);
  	return (NULL);
+ }
+ 
+ char *
+ get_proc_cwd(int fd)
+ {
+         int             name[] = { CTL_KERN, KERN_PROC_CWD, 0 };
+         static char     path[MAXPATHLEN];
+         size_t          pathlen = sizeof path;
+ 
+         if ((name[2] = tcgetpgrp(fd)) == -1)
+                 return (NULL);
+         if (sysctl(name, 3, path, &pathlen, NULL, 0) != 0)
+                 return (NULL);
+         return (path);
  }