mirror of
https://github.com/GnoConsortium/gno.git
synced 2024-11-15 15:07:16 +00:00
74 lines
3.0 KiB
Groff
74 lines
3.0 KiB
Groff
.\" Copyright (c) 1983, 1991, 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.
|
|
.\"
|
|
.\" @(#)getdtablesize.2 8.1 (Berkeley) 6/4/93
|
|
.\"
|
|
.TH GETDTABLESIZE 2 "22 February 1996" GNO "System Calls"
|
|
.SH NAME
|
|
.BR getdtablesize
|
|
\- get descriptor table size
|
|
.SH SYNOPSIS
|
|
#include <unistd.h>
|
|
.sp 1
|
|
int
|
|
.BR getdtablesize (void);
|
|
.SH DESCRIPTION
|
|
Each process has a fixed size descriptor table,
|
|
which is guaranteed to have at least 20 slots. The entries in
|
|
the descriptor table are numbered with small integers starting at 0.
|
|
The call
|
|
.BR getdtablesize
|
|
returns the size of this table.
|
|
.LP
|
|
This call is mainly intended for use on systems which have configurable
|
|
kernels. Since the GNO kernel is not yet configurable, this function
|
|
always returns
|
|
.BR OPEN_MAX .
|
|
.SH BUGS
|
|
The concept of the maximum number of concurrently open files is not
|
|
yet consistent between GS/OS, the GNO kernel, and the C library. For
|
|
example, the kernel uses
|
|
.BR OPEN_MAX
|
|
as the largest number of open files, yet GS/OS does not have a hard upper
|
|
limit. It is recommended for now that the return value of
|
|
.BR getdtablesize
|
|
be assumed in applications to be the largest number of open files, as
|
|
it is the smallest value.
|
|
.SH SEE ALSO
|
|
.BR close (2),
|
|
.BR dup (2),
|
|
.BR open (2),
|
|
.BR select (2)
|
|
.SH HISTORY
|
|
The
|
|
.BR getdtablesize
|
|
function call appeared in 4.2BSD.
|