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-.\" Copyright (c) 1993
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-.\"	@(#)confstr.3	8.1 (Berkeley) 6/4/93
-.\" $FreeBSD: src/lib/libc/gen/confstr.3,v 1.11 2001/10/01 16:08:50 ru Exp $
-.\"
-.Dd June 18, 2001
-.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
-This interface is specified by
-.\" .St -p1003.1-200x .
-.Tn POSIX .
-A more flexible (but non-portable) interface is provided by
-.Xr sysctl 3 .
-.Pp
-The
-.Fn confstr
-function provides a method for applications to get configuration
-defined string values.
-Shell programmers needing access to these parameters should use the
-.Xr getconf 1
-utility.
-.Pp
-The
-.Fa name
-argument specifies the system variable to be queried.
-Symbolic constants for each name value are found in the include file
-.Aq Pa 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 6n
-.Pp
-.It Li _CS_DARWIN_USER_DIR
-Provides the path to a user's folder. The directory will be created if it
-does not already exist.
-.Pp
-This directory is created with access permissions of 0755 and restricted by
-the
-.Xr umask 2
-of the calling process and is not intended to be used for
-sensitive or temporary file storage, as all users can see files created here.
-If the user's umask allows it, files created here will be world readable,
-which could lead to information disclosure.
-.Pp
-.It Li _CS_DARWIN_USER_TEMP_DIR
-Provides the path to a user's temporary items directory. The directory will be
-created it if does not already exist. This directory is created with access
-permissions of 0700 and restricted by the
-.Xr umask 2
-of the calling process and is a good location for temporary files.
-.Pp
-By default, files in this location may be cleaned (removed) by the system if
-they are not accessed in 3 days.
-.Pp
-.It Li _CS_DARWIN_USER_CACHE_DIR
-Provides the path to the user's cache directory. The directory will be created
-if it does not already exist. This directory is created with access permissions
-of 0700 and restricted by the
-.Xr umask 2
-of the calling process and is a good location for user cache data as it will not
-be automatically cleaned by the system.
-.Pp
-Files in this location will be removed during safe boot.
-.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, 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
-.Fn confstr
-function may fail and set
-.Va errno
-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.
-.It Bq Er ENOMEM
-Insufficient storage space is available.
-.It Bq Er EIO
-I/O error communicating with
-.Xr dirhelper 8 .
-.El
-.Sh LEGACY ERRORS
-If the call to
-.Fn confstr
-is not successful, \-1 (rather than 0) is returned and
-.Va errno
-is set appropriately.
-.Sh SEE ALSO
-.Xr getconf 1 ,
-.Xr pathconf 2 ,
-.Xr sysconf 3 ,
-.Xr sysctl 3
-.Sh HISTORY
-The
-.Fn confstr
-function first appeared in
-.Bx 4.4 .