===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/procname.c,v
retrieving revision 1.16
retrieving revision 1.17
diff -u -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 +1,4 @@
-/* $OpenBSD: procname.c,v 1.16 2016/10/10 21:29:23 nicm Exp $ */
+/* $OpenBSD: procname.c,v 1.17 2020/04/08 11:26:07 nicm Exp $ */
 
 /*
  * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -38,6 +38,7 @@
 
 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)
@@ -131,4 +132,18 @@
 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);
 }