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74 lines
3.0 KiB
Groff
74 lines
3.0 KiB
Groff
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.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)getdtablesize.2 8.1 (Berkeley) 6/4/93
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.\"
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.TH GETDTABLESIZE 2 "22 February 1996" GNO "System Calls"
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.SH NAME
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.BR getdtablesize
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\- get descriptor table size
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.SH SYNOPSIS
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#include <unistd.h>
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.sp 1
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int
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.BR getdtablesize (void);
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.SH DESCRIPTION
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Each process has a fixed size descriptor table,
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which is guaranteed to have at least 20 slots. The entries in
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the descriptor table are numbered with small integers starting at 0.
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The call
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.BR getdtablesize
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returns the size of this table.
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.LP
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This call is mainly intended for use on systems which have configurable
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kernels. Since the GNO kernel is not yet configurable, this function
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always returns
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.BR OPEN_MAX .
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.SH BUGS
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The concept of the maximum number of concurrently open files is not
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yet consistent between GS/OS, the GNO kernel, and the C library. For
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example, the kernel uses
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.BR OPEN_MAX
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as the largest number of open files, yet GS/OS does not have a hard upper
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limit. It is recommended for now that the return value of
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.BR getdtablesize
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be assumed in applications to be the largest number of open files, as
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it is the smallest value.
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.SH SEE ALSO
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.BR close (2),
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.BR dup (2),
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.BR open (2),
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.BR select (2)
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.SH HISTORY
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The
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.BR getdtablesize
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function call appeared in 4.2BSD.
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