getdtablesize() returns the
maximum number of files a process can have open, one more
than the largest possible value for a file descriptor.
RETURN VALUE
The current limit on the number of open files per
process.
ERRORS
On Linux, getdtablesize()
can return any of the errors described for getrlimit(2); see NOTES
below.
CONFORMING TO
SVr4, 4.4BSD (the getdtablesize() function first appeared in
4.2BSD). It is not specified in POSIX.1-2001; portable
applications should employ sysconf(_SC_OPEN_MAX) instead
of this call.
NOTES
getdtablesize() is
implemented as a libc library function. The glibc version
calls getrlimit(2) and returns
the current RLIMIT_NOFILE
limit, or OPEN_MAX when that
fails. The libc4 and libc5 versions return OPEN_MAX (set to 256 since Linux
0.98.4).
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided that the
entire resulting derived work is distributed under the terms of a
permission notice identical to this one.
Since the Linux kernel and libraries are constantly changing, this
manual page may be incorrect or out-of-date. The author(s) assume no
responsibility for errors or omissions, or for damages resulting from
the use of the information contained herein. The author(s) may not
have taken the same level of care in the production of this manual,
which is licensed free of charge, as they might when working
professionally.
Formatted or processed versions of this manual, if unaccompanied by
the source, must acknowledge the copyright and authors of this work.
Modified 2002-04-15 by Roger Luethi <rl@hellgate.ch> and aeb
![[Note]](../stylesheet/note.png)