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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.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 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
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-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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-.\"
-.\"     @(#)getenv.3	8.2 (Berkeley) 12/11/93
-.\" $FreeBSD: src/lib/libc/stdlib/getenv.3,v 1.16 2004/07/07 19:57:13 ru Exp $
-.\"
-.Dd December 11, 1993
-.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 *
-.Fo getenv
-.Fa "const char *name"
-.Fc
-.Ft int
-.Fo putenv
-.Fa "char *string"
-.Fc
-.Ft int
-.Fo setenv
-.Fa "const char *name"
-.Fa "const char *value"
-.Fa "int overwrite"
-.Fc
-.Ft int
-.Fo unsetenv
-.Fa "const char *name"
-.Fc
-.Sh DESCRIPTION
-These functions set, unset and fetch environment variables from the
-host
-.Em environment list .
-For compatibility with differing environment conventions,
-the given arguments
-.Fa name
-and
-.Fa value
-may be appended and prepended,
-respectively,
-with an equal sign
-.Dq Li \&= .
-.Pp
-The
-.Fn getenv
-function obtains the current value of the environment variable,
-.Fa name .
-.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 is
-equivalent to:
-.Bd -literal -offset indent
-setenv(name, value, 1);
-.Ed
-.Pp
-The string pointed to by
-.Fa string
-becomes part of the environment.
-A program should not alter or free the string,
-and should not use stack or other transient string variables
-as arguments to
-.Fn putenv .
-The
-.Fn setenv
-function is strongly preferred to
-.Fn putenv .
-.Pp
-The
-.Fn unsetenv
-function
-deletes all instances of the variable name pointed to by
-.Fa name
-from the list.
-Note that only the variable name (e.g., "NAME") should be given;
-"NAME=value" will not work.
-.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 unsetenv
-failed because
-.Fa name
-was not found in the environment list.
-.It Bq Er ENOMEM
-The function
-.Fn setenv
-or
-.Fn putenv
-failed because it was unable to allocate memory for the environment.
-.El
-.Sh LEGACY SYNOPSIS
-.Fd #include <stdlib.h>
-.Pp
-.Ft void
-.br
-.Fo unsetenv
-.Fa "const char *name"
-.Fc ;
-.Pp
-.Fn unsetenv
-doesn't return a value.
-.Sh COMPATIBILITY
-.Fn putenv
-no longer copies its input buffer.
-This often appears in crash logs as a crash in
-.Fn getenv .
-Avoid passing local buffers or freeing the memory
-that is passed to
-.Fn putenv .
-Use
-.Fn setenv ,  
-which still makes an internal copy of its buffers.
-.Pp
-.Fn unsetenv
-no longer parses the variable name;
-e.g., unsetenv ("FOO=BAR") no longer works.
-Use unsetenv("FOO").
-.Fn unsetenv
-also now returns a status value and will set
-.Va errno
-to EINVAL if
-.Fa name
-is not a defined environment variable.
-.Sh SEE ALSO
-.Xr csh 1 ,
-.Xr sh 1 ,
-.Xr execve 2 ,
-.Xr compat 5 ,
-.Xr environ 7
-.Sh STANDARDS
-The
-.Fn getenv
-function conforms to
-.St -isoC .
-.Sh BUGS
-Successive calls to
-.Fn setenv
-or
-.Fn putenv
-assigning a differently sized
-.Fa value
-to the same
-.Fa name
-will result in a memory leak.
-The
-.Fx
-semantics for these functions
-(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.
-.Sh HISTORY
-The functions
-.Fn setenv
-and
-.Fn unsetenv
-appeared in
-.At v7 .
-The
-.Fn putenv
-function appeared in
-.Bx 4.3 Reno .