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-.\" Copyright (c) 1988, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" the American National Standards Committee X3, on Information
-.\" Processing Systems.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)getenv.3	8.2 (Berkeley) 12/11/93
-.\" $FreeBSD$
-.\"
-.Dd June 20, 2007
-.Dt GETENV 3
-.Os
-.Sh NAME
-.Nm getenv ,
-.Nm putenv ,
-.Nm setenv ,
-.Nm unsetenv
-.Nd environment variable functions
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In stdlib.h
-.Ft char *
-.Fn getenv "const char *name"
-.Ft int
-.Fn setenv "const char *name" "const char *value" "int overwrite"
-.Ft int
-.Fn putenv "char *string"
-.Ft int
-.Fn unsetenv "const char *name"
-.Sh DESCRIPTION
-These functions set, unset and fetch environment variables from the
-host
-.Em environment list .
-.Pp
-The
-.Fn getenv
-function obtains the current value of the environment variable,
-.Fa name .
-The application should not modify the string pointed
-to by the
-.Fn getenv
-function.
-.Pp
-The
-.Fn setenv
-function inserts or resets the environment variable
-.Fa name
-in the current environment list.
-If the variable
-.Fa name
-does not exist in the list,
-it is inserted with the given
-.Fa value .
-If the variable does exist, the argument
-.Fa overwrite
-is tested; if
-.Fa overwrite
-is zero, the
-variable is not reset, otherwise it is reset
-to the given
-.Fa value .
-.Pp
-The
-.Fn putenv
-function takes an argument of the form ``name=value'' and
-puts it directly into the current environment,
-so altering the argument shall change the environment.
-If the variable
-.Fa name
-does not exist in the list,
-it is inserted with the given
-.Fa value .
-If the variable
-.Fa name
-does exist, it is reset to the given
-.Fa value .
-.Pp
-The
-.Fn unsetenv
-function
-deletes all instances of the variable name pointed to by
-.Fa name
-from the list.
-.Pp
-If corruption (e.g., a name without a value) is detected while making a copy of
-environ for internal usage, then
-.Fn setenv ,
-.Fn unsetenv
-and
-.Fn putenv
-will output a warning to stderr about the issue, drop the corrupt entry and
-complete the task without error.
-.Sh RETURN VALUES
-The
-.Fn getenv
-function returns the value of the environment variable as a
-.Dv NUL Ns
--terminated string.
-If the variable
-.Fa name
-is not in the current environment,
-.Dv NULL
-is returned.
-.Pp
-.Rv -std setenv putenv unsetenv
-.Sh ERRORS
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The function
-.Fn getenv ,
-.Fn setenv
-or
-.Fn unsetenv
-failed because the
-.Fa name
-is a
-.Dv NULL
-pointer, points to an empty string, or points to a string containing an
-.Dq Li \&=
-character.
-.Pp
-The function
-.Fn putenv
-failed because
-.Fa string
-is a
-.Dv NULL
-pointer,
-.Fa string is without an
-.Dq Li \&=
-character or
-.Dq Li \&=
-is the first character in
-.Fa string .
-This does not follow the
-.Tn POSIX
-specification.
-.It Bq Er ENOMEM
-The function
-.Fn setenv ,
-.Fn unsetenv
-or
-.Fn putenv
-failed because they were unable to allocate memory for the environment.
-.El
-.Sh SEE ALSO
-.Xr csh 1 ,
-.Xr sh 1 ,
-.Xr execve 2 ,
-.Xr environ 7
-.Sh STANDARDS
-The
-.Fn getenv
-function conforms to
-.St -isoC .
-The
-.Fn setenv ,
-.Fn putenv
-and
-.Fn unsetenv
-functions conforms to
-.St -p1003.1-2001 .
-.Sh HISTORY
-The functions
-.Fn setenv
-and
-.Fn unsetenv
-appeared in
-.At v7 .
-The
-.Fn putenv
-function appeared in
-.Bx 4.3 Reno .
-.Pp
-Until
-.Fx 7.0 ,
-.Fn putenv
-would make a copy of 
-.Fa string
-and insert it into the environment using
-.Fn setenv .
-This was changed to use
-.Fa string
-as the memory location of the ``name=value'' pair to follow the
-.Tn POSIX
-specification.
-.Sh BUGS
-Successive calls to
-.Fn setenv
-that assign a larger-sized
-.Fa value
-than any previous value to the same
-.Fa name
-will result in a memory leak.
-The
-.Fx
-semantics for this function
-(namely, that the contents of
-.Fa value
-are copied and that old values remain accessible indefinitely) make this
-bug unavoidable.
-Future versions may eliminate one or both of these
-semantic guarantees in order to fix the bug.