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diff --git a/src/lib/libc/stdlib/getenv.3 b/src/lib/libc/stdlib/getenv.3
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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
+.\" 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.
+.\"
+.\"     $OpenBSD: getenv.3,v 1.2 1996/08/10 05:03:00 tholo Exp $
+.\"
+.Dd December 11, 1993
+.Dt GETENV 3
+.Os
+.Sh NAME
+.Nm getenv ,
+.Nm putenv ,
+.Nm setenv ,
+.Nm unsetenv
+.Nd environment variable functions
+.Sh SYNOPSIS
+.Fd #include <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 "const char *string"
+.Ft void
+.Fn unsetenv "const char *name"
+.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
+.Ar name
+and
+.Ar 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,
+.Ar name .
+If the variable
+.Ar name
+is not in the current environment,
+a null pointer is returned.
+.Pp
+The
+.Fn setenv
+function inserts or resets the environment variable
+.Ar name
+in the current environment list.
+If the variable
+.Ar name
+does not exist in the list,
+it is inserted with the given
+.Ar value.
+If the variable does exist, the argument
+.Ar overwrite
+is tested; if
+.Ar overwrite is
+zero, the
+variable is not reset, otherwise it is reset
+to the given
+.Ar 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
+.Fn unsetenv
+function
+deletes all instances of the variable name pointed to by
+.Fa name
+from the list.
+.Sh RETURN VALUES
+The functions
+.Fn setenv
+and
+.Fn putenv
+return zero if successful; otherwise the global variable
+.Va errno
+is set to indicate the error and a
+\-1 is returned.
+.Sh ERRORS
+.Bl -tag -width [ENOMEM]
+.It Bq Er ENOMEM
+The function
+.Fn setenv
+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 -ansiC .
+.Sh HISTORY
+The functions
+.Fn setenv
+and
+.Fn unsetenv
+appeared in
+.At v7 .
+The
+.Fn putenv
+function appeared in
+.Bx 4.3 Reno .

diff --git a/src/lib/libc/stdlib/getenv.3 b/src/lib/libc/stdlib/getenv.3 new file mode 100644 index 0000000000..24a8d3d095 --- /dev/null +++ b/src/lib/libc/stdlib/getenv.3
@@ -0,0 +1,151 @@
	1	.\" Copyright (c) 1988, 1991, 1993
	2	.\" The Regents of the University of California. All rights reserved.
	3	.\"
	4	.\" This code is derived from software contributed to Berkeley by
	5	.\" the American National Standards Committee X3, on Information
	6	.\" Processing Systems.
	7	.\"
	8	.\" Redistribution and use in source and binary forms, with or without
	9	.\" modification, are permitted provided that the following conditions
	10	.\" are met:
	11	.\" 1. Redistributions of source code must retain the above copyright
	12	.\" notice, this list of conditions and the following disclaimer.
	13	.\" 2. Redistributions in binary form must reproduce the above copyright
	14	.\" notice, this list of conditions and the following disclaimer in the
	15	.\" documentation and/or other materials provided with the distribution.
	16	.\" 3. All advertising materials mentioning features or use of this software
	17	.\" must display the following acknowledgement:
	18	.\" This product includes software developed by the University of
	19	.\" California, Berkeley and its contributors.
	20	.\" 4. Neither the name of the University nor the names of its contributors
	21	.\" may be used to endorse or promote products derived from this software
	22	.\" without specific prior written permission.
	23	.\"
	24	.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	25	.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	28	.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	29	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	30	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	31	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	32	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	33	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	34	.\" SUCH DAMAGE.
	35	.\"
	36	.\" $OpenBSD: getenv.3,v 1.2 1996/08/10 05:03:00 tholo Exp $
	37	.\"
	38	.Dd December 11, 1993
	39	.Dt GETENV 3
	40	.Os
	41	.Sh NAME
	42	.Nm getenv ,
	43	.Nm putenv ,
	44	.Nm setenv ,
	45	.Nm unsetenv
	46	.Nd environment variable functions
	47	.Sh SYNOPSIS
	48	.Fd #include <stdlib.h>
	49	.Ft char *
	50	.Fn getenv "const char *name"
	51	.Ft int
	52	.Fn setenv "const char name" "const char value" "int overwrite"
	53	.Ft int
	54	.Fn putenv "const char *string"
	55	.Ft void
	56	.Fn unsetenv "const char *name"
	57	.Sh DESCRIPTION
	58	These functions set, unset and fetch environment variables from the
	59	host
	60	.Em environment list .
	61	For compatibility with differing environment conventions,
	62	the given arguments
	63	.Ar name
	64	and
	65	.Ar value
	66	may be appended and prepended,
	67	respectively,
	68	with an equal sign
	69	.Dq Li \&= .
	70	.Pp
	71	The
	72	.Fn getenv
	73	function obtains the current value of the environment variable,
	74	.Ar name .
	75	If the variable
	76	.Ar name
	77	is not in the current environment,
	78	a null pointer is returned.
	79	.Pp
	80	The
	81	.Fn setenv
	82	function inserts or resets the environment variable
	83	.Ar name
	84	in the current environment list.
	85	If the variable
	86	.Ar name
	87	does not exist in the list,
	88	it is inserted with the given
	89	.Ar value.
	90	If the variable does exist, the argument
	91	.Ar overwrite
	92	is tested; if
	93	.Ar overwrite is
	94	zero, the
	95	variable is not reset, otherwise it is reset
	96	to the given
	97	.Ar value .
	98	.Pp
	99	The
	100	.Fn putenv
	101	function takes an argument of the form ``name=value'' and is
	102	equivalent to:
	103	.Bd -literal -offset indent
	104	setenv(name, value, 1);
	105	.Ed
	106	.Pp
	107	The
	108	.Fn unsetenv
	109	function
	110	deletes all instances of the variable name pointed to by
	111	.Fa name
	112	from the list.
	113	.Sh RETURN VALUES
	114	The functions
	115	.Fn setenv
	116	and
	117	.Fn putenv
	118	return zero if successful; otherwise the global variable
	119	.Va errno
	120	is set to indicate the error and a
	121	\-1 is returned.
	122	.Sh ERRORS
	123	.Bl -tag -width [ENOMEM]
	124	.It Bq Er ENOMEM
	125	The function
	126	.Fn setenv
	127	or
	128	.Fn putenv
	129	failed because they were unable to allocate memory for the environment.
	130	.El
	131	.Sh SEE ALSO
	132	.Xr csh 1 ,
	133	.Xr sh 1 ,
	134	.Xr execve 2 ,
	135	.Xr environ 7
	136	.Sh STANDARDS
	137	The
	138	.Fn getenv
	139	function conforms to
	140	.St -ansiC .
	141	.Sh HISTORY
	142	The functions
	143	.Fn setenv
	144	and
	145	.Fn unsetenv
	146	appeared in
	147	.At v7 .
	148	The
	149	.Fn putenv
	150	function appeared in
	151	.Bx 4.3 Reno .