207 lines
5.5 KiB
Groff
207 lines
5.5 KiB
Groff
.\"
|
|
.\" Copyright 2000 Massachusetts Institute of Technology
|
|
.\"
|
|
.\" Permission to use, copy, modify, and distribute this software and
|
|
.\" its documentation for any purpose and without fee is hereby
|
|
.\" granted, provided that both the above copyright notice and this
|
|
.\" permission notice appear in all copies, that both the above
|
|
.\" copyright notice and this permission notice appear in all
|
|
.\" supporting documentation, and that the name of M.I.T. not be used
|
|
.\" in advertising or publicity pertaining to distribution of the
|
|
.\" software without specific, written prior permission. M.I.T. makes
|
|
.\" no representations about the suitability of this software for any
|
|
.\" purpose. It is provided "as is" without express or implied
|
|
.\" warranty.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
|
|
.\" ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
|
.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
|
|
.\" SHALL M.I.T. 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd September 18, 2002
|
|
.Dt GETCONF 1
|
|
.Os
|
|
.Sh NAME
|
|
.Nm getconf
|
|
.Nd retrieve standard configuration variables
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl v Ar environment
|
|
.Ar path_var
|
|
.Ar file
|
|
.Nm
|
|
.Op Fl v Ar environment
|
|
.Ar system_var
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
utility prints the value of a
|
|
.Tn POSIX
|
|
or
|
|
.Tn X/Open
|
|
path or system configuration variable to the standard output.
|
|
If the specified variable is undefined, the string
|
|
.Dq Li undefined
|
|
is output.
|
|
.Pp
|
|
The first form of the command, with two mandatory
|
|
arguments, retrieves file- and file system-specific
|
|
configuration variables using
|
|
.Xr pathconf 2 .
|
|
The second form, with a single argument, retrieves system
|
|
configuration variables using
|
|
.Xr confstr 3
|
|
and
|
|
.Xr sysconf 3 ,
|
|
depending on the type of variable.
|
|
As an extension, the second form can also be used to query static limits from
|
|
.Aq Pa limits.h .
|
|
.Pp
|
|
All
|
|
.Xr sysconf 3
|
|
and
|
|
.Xr pathconf 2
|
|
variables use the same name as the manifest constants defined in
|
|
the relevant standard C-language bindings, including any leading
|
|
underscore or prefix.
|
|
That is to say,
|
|
.Ar system_var
|
|
might be
|
|
.Dv ARG_MAX
|
|
or
|
|
.Dv _POSIX_VERSION ,
|
|
as opposed to the
|
|
.Xr sysconf 3
|
|
names
|
|
.Dv _SC_ARG_MAX
|
|
or
|
|
.Dv _SC_POSIX_VERSION .
|
|
Variables retrieved from
|
|
.Xr confstr 3
|
|
have the leading
|
|
.Ql _CS_
|
|
stripped off; thus,
|
|
.Dv _CS_PATH
|
|
is queried by a
|
|
.Ar system_var
|
|
of
|
|
.Dq Li PATH .
|
|
.Ss Programming Environments
|
|
The
|
|
.Fl v Ar environment
|
|
option specifies a
|
|
.St -p1003.1-2001
|
|
programming environment under which the values are to be queried.
|
|
This option currently does nothing, but may in the future be used
|
|
to select between 32-bit and 64-bit execution environments on platforms
|
|
which support both.
|
|
Specifying an environment which is not supported on the current execution
|
|
platform gives undefined results.
|
|
.Pp
|
|
The standard programming environments are as follows:
|
|
.Bl -tag -width ".Li POSIX_V6_LPBIG_OFFBIG" -offset indent
|
|
.It Li POSIX_V6_ILP32_OFF32
|
|
Exactly 32-bit integer, long, pointer, and file offset.
|
|
.Sy Supported platforms :
|
|
None.
|
|
.It Li POSIX_V6_ILP32_OFFBIG
|
|
Exactly 32-bit integer, long, and pointer; at least 64-bit file offset.
|
|
.Sy Supported platforms :
|
|
.Tn IA32 ,
|
|
.Tn PowerPC .
|
|
.It Li POSIX_V6_LP64_OFF64
|
|
Exactly 32-bit integer; exactly 64-bit long, pointer, and file offset.
|
|
.Sy Supported platforms :
|
|
.Tn Alpha ,
|
|
.Tn SPARC64 .
|
|
.It Li POSIX_V6_LPBIG_OFFBIG
|
|
At least 32-bit integer; at least 64-bit long, pointer, and file offset.
|
|
.Sy Supported platforms :
|
|
None.
|
|
.El
|
|
.Pp
|
|
The command:
|
|
.Pp
|
|
.Dl "getconf POSIX_V6_WIDTH_RESTRICTED_ENVS"
|
|
.Pp
|
|
returns a newline-separated list of environments in which the width
|
|
of certain fundamental types is no greater than the width of the native
|
|
C type
|
|
.Vt long .
|
|
At present, all programming environments supported by
|
|
.Fx
|
|
have this property.
|
|
Several of the
|
|
.Xr confstr 3
|
|
variables provide information on the necessary compiler and linker flags
|
|
to use the standard programming environments described above.
|
|
.Sh DIAGNOSTICS
|
|
.Ex -std
|
|
Use of a
|
|
.Ar system_var
|
|
or
|
|
.Ar path_var
|
|
which is completely unrecognized is considered an error,
|
|
causing a diagnostic message to be written to standard error.
|
|
One
|
|
which is known but merely undefined does not result in an error
|
|
indication.
|
|
The
|
|
.Nm
|
|
utility recognizes all of the variables defined for
|
|
.St -p1003.1-2001 ,
|
|
including those which are not currently implemented.
|
|
.Sh EXAMPLES
|
|
The command:
|
|
.Pp
|
|
.Dl "getconf PATH"
|
|
.Pp
|
|
will display the system default setting for the
|
|
.Ev PATH
|
|
environment variable.
|
|
.Pp
|
|
The command:
|
|
.Pp
|
|
.Dl "getconf NAME_MAX /tmp"
|
|
.Pp
|
|
will display the maximum length of a filename in the
|
|
.Pa /tmp
|
|
directory.
|
|
.Pp
|
|
The command:
|
|
.Pp
|
|
.Dl "getconf -v POSIX_V6_LPBIG_OFFBIG LONG_MAX"
|
|
.Pp
|
|
will display the maximum value of the C type
|
|
.Vt long
|
|
in the
|
|
.Li POSIX_V6_LPBIG_OFFBIG
|
|
programming environment,
|
|
if the system supports that environment.
|
|
.Sh SEE ALSO
|
|
.Xr pathconf 2 ,
|
|
.Xr confstr 3 ,
|
|
.Xr sysconf 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Nm
|
|
utility is expected to be compliant with
|
|
.St -p1003.1-2001 .
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
utility first appeared in
|
|
.Fx 5.0 .
|
|
.Sh AUTHORS
|
|
.An Garrett A. Wollman Aq wollman@lcs.mit.edu
|