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-.\" Copyright 2001 John Levon <moz@compsoc.man.ac.uk>
-.\"
-.\" %%%LICENSE_START(VERBATIM)
-.\" Permission is granted to make and distribute verbatim copies of this
-.\" manual provided the copyright notice and this permission notice are
-.\" preserved on all copies.
-.\"
-.\" Permission is granted to copy and distribute modified versions of this
-.\" manual under the conditions for verbatim copying, provided that the
-.\" entire resulting derived work is distributed under the terms of a
-.\" permission notice identical to this one.
-.\"
-.\" Since the Linux kernel and libraries are constantly changing, this
-.\" manual page may be incorrect or out-of-date.  The author(s) assume no
-.\" responsibility for errors or omissions, or for damages resulting from
-.\" the use of the information contained herein.  The author(s) may not
-.\" have taken the same level of care in the production of this manual,
-.\" which is licensed free of charge, as they might when working
-.\" professionally.
-.\"
-.\" Formatted or processed versions of this manual, if unaccompanied by
-.\" the source, must acknowledge the copyright and authors of this work.
-.\" %%%LICENSE_END
-.\"
-.\" Additions, aeb, 2001-10-17.
-.TH CLEARENV 3  2014-08-19 "Linux" "Linux Programmer's Manual"
-.SH NAME
-clearenv \- clear the environment
-.SH SYNOPSIS
-.nf
-.B #include <stdlib.h>
-.sp
-.B "int clearenv(void);"
-.fi
-.sp
-.in -4n
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.in
-.sp
-.BR clearenv ():
-_SVID_SOURCE || _BSD_SOURCE
-.SH DESCRIPTION
-The
-.BR clearenv ()
-function clears the environment of all name-value
-pairs and sets the value of the external variable
-.I environ
-to NULL.
-.SH RETURN VALUE
-The
-.BR clearenv ()
-function returns zero on success, and a nonzero
-value on failure.
-.\" Most versions of UNIX return -1 on error, or do not even have errors.
-.\" Glibc info and the Watcom C library document "a nonzero value".
-.SH VERSIONS
-Available since glibc 2.0.
-.SH CONFORMING TO
-Various UNIX variants (DG/UX, HP-UX, QNX, ...).
-POSIX.9 (bindings for FORTRAN77).
-POSIX.1-1996 did not accept
-.BR clearenv ()
-and
-.BR putenv (3),
-but changed its mind and scheduled these functions for some
-later issue of this standard (cf. B.4.6.1).
-However, POSIX.1-2001
-adds only
-.BR putenv (3),
-and rejected
-.BR clearenv ().
-.SH NOTES
-Used in security-conscious applications.
-If it is unavailable
-the assignment
-.nf
-
-    environ = NULL;
-
-.fi
-will probably do.
-.LP
-The DG/UX and Tru64 man pages write: If
-.I environ
-has been modified by anything other than the
-.BR putenv (3),
-.BR getenv (3),
-or
-.BR clearenv ()
-functions, then
-.BR clearenv ()
-will return an error and the process environment will remain unchanged.
-.\" .LP
-.\" HP-UX has a ENOMEM error return.
-.SH SEE ALSO
-.BR getenv (3),
-.BR putenv (3),
-.BR setenv (3),
-.BR unsetenv (3),
-.BR environ (7)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.