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+.\"
+.\" This file and its contents are supplied under the terms of the
+.\" Common Development and Distribution License ("CDDL"), version 1.0.
+.\" You may only use this file in accordance with the terms of version
+.\" 1.0 of the CDDL.
+.\"
+.\" A full copy of the text of the CDDL should have accompanied this
+.\" source.  A copy of the CDDL is also available via the Internet at
+.\" http://www.illumos.org/license/CDDL.
+.\"
+.\"
+.\" Copyright (c) 2014, Joyent, Inc.
+.\"
+.Dd "Dec 20, 2014"
+.Dt CLEARENV 3C
+.Os
+.Sh NAME
+.Nm clearenv
+.Nd clear environment
+.Sh SYNOPSIS
+.In stdlib.h
+.Ft int
+.Fo clearenv
+.Fa void
+.Fc
+.Sh DESCRIPTION
+The
+.Fn clearenv
+function clears the contents of the environment. All environment variables in
+the calling process are removed as though the function
+.Xr unsetenv 3C
+had been called on every environment variable. Until subsequent calls to
+.Xr putenv 3C
+or
+.Xr setenv 3C
+are made, calls to
+.Xr getenv 3C
+will always return
+.Sy NULL .
+.Sh RETURN VALUES
+Upon successful completion,
+.Fn clearenv
+returns
+.Sy 0 .
+Otherwise, it returns a non-zero value and sets
+.Sy errno
+to indicate the error. At this time, no errors are defined for
+.Fn clearenv ,
+it will always succeed. Portable applications should always check the return
+value of
+.Fn clearenv .
+.Sh ERRORS
+No errors are defined.
+.Sh INTERFACE STABILITY
+.Sy Committed .
+.Sh MT-LEVEL
+.Sy Mt-Safe .
+.Sh SEE ALSO
+.Xr getenv 3C ,
+.Xr unsetenv 3C ,
+.Xr setenv 3C ,
+.Xr attributes 5 ,
+.Xr environ 5 ,
+.Xr standards 5