135 lines
3.6 KiB
Groff
135 lines
3.6 KiB
Groff
|
.\" $NetBSD: confstr.3,v 1.20 2010/04/22 08:00:34 jruoho Exp $
|
||
|
|
.\"
|
||
|
|
.\" 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. 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 April 22, 2010
|
||
|
|
.Dt CONFSTR 3
|
||
|
|
.Os
|
||
|
|
.Sh NAME
|
||
|
|
.Nm confstr
|
||
|
|
.Nd get string-valued configurable variables
|
||
|
|
.Sh LIBRARY
|
||
|
|
.Lb libc
|
||
|
|
.Sh SYNOPSIS
|
||
|
|
.In 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
|
||
|
|
.In unistd.h
|
||
|
|
header.
|
||
|
|
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"
|
||
|
|
.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
|
||
|
|
.Nm confstr
|
||
|
|
is not successful, 0 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
|
||
|
|
.Nm 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.
|
||
|
|
.El
|
||
|
|
.Sh SEE ALSO
|
||
|
|
.Xr sysctl 3
|
||
|
|
.Sh STANDARDS
|
||
|
|
The
|
||
|
|
.Nm confstr
|
||
|
|
function conforms to
|
||
|
|
.St -p1003.2-92 .
|
||
|
|
.Sh HISTORY
|
||
|
|
The
|
||
|
|
.Nm confstr
|
||
|
|
function first appeared in
|
||
|
|
.Bx 4.4 .
|
||
|
|
.Sh BUGS
|
||
|
|
The standards require us to return 0 both on errors, and when the value
|
||
|
|
is not set.
|