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-.\" Copyright (c) 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" 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.
-.\"
-.\"	@(#)confstr.3	8.1 (Berkeley) 6/4/93
-.\"
-.Dd June 4, 1993
-.Dt CONFSTR 3
-.Os BSD 4
-.Sh NAME
-.Nm confstr
-.Nd get string-valued configurable variables
-.Sh SYNOPSIS
-.Fd #include <unistd.h>
-.Ft size_t
-.Fn confstr "int name" "char *buf" "size_t len"
-.Sh DESCRIPTION
-.Bf -symbolic
-This interface is obsoleted by
-.Xr sysctl 3 .
-.Ef
-.Pp
-The
-.Fn confstr
-function provides a method for applications to get configuration
-defined string values.
-.Pp
-The
-.Fa name
-argument specifies the system variable to be queried.
-Symbolic constants for each name value are found in the include file
-.Li <unistd.h> .
-The
-.Fa len
-argument specifies the size of the buffer referenced by the
-argument
-.Fa buf .
-If
-.Fa len
-is non-zero,
-.Fa buf
-is a non-null pointer, and
-.Fa name
-has a value, up to
-.Fa len
-\- 1 bytes of the value are copied into the buffer 
-.Fa buf .
-The copied value is always null terminated.
-.Pp
-The available values are as follows:
-.Pp
-.Bl -tag -width "123456"
-.Pp
-.It Li _CS_PATH
-Return a value for the
-.Ev PATH
-environment variable that finds all the standard utilities.
-.El
-.Sh RETURN VALUES
-If the call to
-.Fn confstr
-is not successful, \-1 is returned and
-.Va errno
-is set appropriately.
-Otherwise, if the variable does not have a configuration defined value,
-0 is returned and
-.Va errno
-is not modified.
-Otherwise, the buffer size needed to hold the entire configuration-defined
-value is returned.
-If this size is greater than the argument
-.Fa len ,
-the string in
-.Fa buf
-was truncated.
-.Sh ERRORS
-The
-.Fn confstr
-function may fail and set
-.Va error
-for any of the errors specified for the library functions
-.Xr malloc 3
-and
-.Xr sysctl 3 .
-.Pp
-In addition, the following errors may be reported:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The value of the
-.Fa name
-argument is invalid.
-.Sh SEE ALSO
-.Xr sysctl 3
-.Sh HISTORY
-The
-.Fn confstr
-function first appeared in
-.Bx 4.4 .