f7a8bc4c04
track.
The $Id$ line is normally at the bottom of the main comment block in the
man page, separated from the rest of the manpage by an empty comment,
like so;
.\" $Id$
.\"
If the immediately preceding comment is a @(#) format ID marker than the
the $Id$ will line up underneath it with no intervening blank lines.
Otherwise, an additional blank line is inserted.
Approved by: bde
166 lines
5.0 KiB
Groff
166 lines
5.0 KiB
Groff
.\" 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.
|
|
.\"
|
|
.\" @(#)pathconf.2 8.1 (Berkeley) 6/4/93
|
|
.\" $Id$
|
|
.\"
|
|
.Dd June 4, 1993
|
|
.Dt PATHCONF 2
|
|
.Os BSD 4
|
|
.Sh NAME
|
|
.Nm pathconf ,
|
|
.Nm fpathconf
|
|
.Nd get configurable pathname variables
|
|
.Sh SYNOPSIS
|
|
.Fd #include <unistd.h>
|
|
.Ft long
|
|
.Fn pathconf "const char *path" "int name"
|
|
.Ft long
|
|
.Fn fpathconf "int fd" "int name"
|
|
.Sh DESCRIPTION
|
|
.Pp
|
|
The
|
|
.Fn pathconf
|
|
and
|
|
.Fn fpathconf
|
|
functions provides a method for applications to determine the current
|
|
value of a configurable system limit or option variable associated
|
|
with a pathname or file descriptor.
|
|
.Pp
|
|
For
|
|
.Fn pathconf ,
|
|
the
|
|
.Fa path
|
|
argument is the name of a file or directory.
|
|
For
|
|
.Fn fpathconf ,
|
|
the
|
|
.Fa fd
|
|
argument is an open file descriptor.
|
|
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> .
|
|
.Pp
|
|
The available values are as follows:
|
|
.Pp
|
|
.Bl -tag -width "123456"
|
|
.Pp
|
|
.It Li _PC_LINK_MAX
|
|
The maximum file link count.
|
|
.It Li _PC_MAX_CANON
|
|
The maximum number of bytes in terminal canonical input line.
|
|
.It Li _PC_MAX_INPUT
|
|
The minimum maximum number of bytes for which space is available in
|
|
a terminal input queue.
|
|
.It Li _PC_NAME_MAX
|
|
The maximum number of bytes in a file name.
|
|
.It Li _PC_PATH_MAX
|
|
The maximum number of bytes in a pathname.
|
|
.It Li _PC_PIPE_BUF
|
|
The maximum number of bytes which will be written atomically to a pipe.
|
|
.It Li _PC_CHOWN_RESTRICTED
|
|
Return 1 if appropriate privileges are required for the
|
|
.Xr chown 2
|
|
system call, otherwise 0.
|
|
.It Li _PC_NO_TRUNC
|
|
Return 1 if file names longer than KERN_NAME_MAX are truncated.
|
|
.It Li _PC_VDISABLE
|
|
Returns the terminal character disabling value.
|
|
.El
|
|
.Sh RETURN VALUES
|
|
If the call to
|
|
.Fn pathconf
|
|
or
|
|
.Fn fpathconf
|
|
is not successful, \-1 is returned and
|
|
.Va errno
|
|
is set appropriately.
|
|
Otherwise, if the variable is associated with functionality that does
|
|
not have a limit in the system, \-1 is returned and
|
|
.Va errno
|
|
is not modified.
|
|
Otherwise, the current variable value is returned.
|
|
.Sh ERRORS
|
|
If any of the following conditions occur, the
|
|
.Fn pathconf
|
|
and
|
|
.Fn fpathconf
|
|
functions shall return -1 and set
|
|
.Va errno
|
|
to the corresponding value.
|
|
.Bl -tag -width Er
|
|
.It Bq Er EINVAL
|
|
The value of the
|
|
.Fa name
|
|
argument is invalid.
|
|
.It Bq Er EINVAL
|
|
The implementation does not support an association of the variable
|
|
name with the associated file.
|
|
.El
|
|
.Fn Pathconf
|
|
will fail if:
|
|
.Bl -tag -width ENAMETOOLONGAA
|
|
.It Bq Er ENOTDIR
|
|
A component of the path prefix is not a directory.
|
|
.It Bq Er ENAMETOOLONG
|
|
A component of a pathname exceeded 255 characters,
|
|
or an entire path name exceeded 1023 characters.
|
|
.It Bq Er ENOENT
|
|
The named file does not exist.
|
|
.It Bq Er EACCES
|
|
Search permission is denied for a component of the path prefix.
|
|
.It Bq Er ELOOP
|
|
Too many symbolic links were encountered in translating the pathname.
|
|
.It Bq Er EIO
|
|
An I/O error occurred while reading from or writing to the file system.
|
|
.El
|
|
.Pp
|
|
.Bl -tag -width [EFAULT]
|
|
.Fn Fpathconf
|
|
will fail if:
|
|
.It Bq Er EBADF
|
|
.Fa fd
|
|
is not a valid open file descriptor.
|
|
.It Bq Er EIO
|
|
An I/O error occurred while reading from or writing to the file system.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr sysctl 3
|
|
.Sh HISTORY
|
|
The
|
|
.Fn pathconf
|
|
and
|
|
.Fn fpathconf
|
|
functions first appeared in
|
|
.Bx 4.4 .
|