.Dt CTERMID 3
.Os
.Sh NAME
-.Nm ctermid
+.Nm ctermid ,
+.Nm ctermid_r
.Nd generate terminal pathname
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In stdio.h
.Ft char *
-.Fn ctermid "char *buf"
+.Fn ctermid "char *s"
.Ft char *
-.Fn ctermid_r "char *buf"
+.Fn ctermid_r "char *s"
.Sh DESCRIPTION
The
.Fn ctermid
-function generates a string, that, when used as a pathname, refers to
+function generates a string that, when used as a pathname, refers to
the current controlling terminal of the calling process.
.Pp
If
-.Fa buf
+.Fa s
is the
.Dv NULL
pointer, a pointer to a static area is returned.
Otherwise, the pathname is copied into the memory referenced by
-.Fa buf .
+.Fa s .
The argument
-.Fa buf
+.Fa s
is assumed to be at least
.Dv L_ctermid
(as defined in the include
.Fn ctermid_r
function
provides the same functionality as
-.Fn ctermid
+.Fn ctermid ,
except that if
-.Fa buf
+.Fa s
is a
.Dv NULL
pointer,