man/, share/mk/: Move man*/ to man/

[thirdparty/man-pages.git] / man3 / getdtablesize.3

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-'\" t
-.\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" Modified 2002-04-15 by Roger Luethi <rl@hellgate.ch> and aeb
-.\"
-.TH getdtablesize 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-getdtablesize \- get file descriptor table size
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.B int getdtablesize(void);
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR getdtablesize ():
-.nf
-    Since glibc 2.20:
-        _DEFAULT_SOURCE || ! (_POSIX_C_SOURCE >= 200112L)
-    glibc 2.12 to glibc 2.19:
-        _BSD_SOURCE || ! (_POSIX_C_SOURCE >= 200112L)
-    Before glibc 2.12:
-        _BSD_SOURCE || _XOPEN_SOURCE >= 500
-.\"        || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
-.fi
-.SH DESCRIPTION
-.BR getdtablesize ()
-returns the maximum number of files a process can have open,
-one more than the largest possible value for a file descriptor.
-.SH RETURN VALUE
-The current limit on the number of open files per process.
-.SH ERRORS
-On Linux,
-.BR getdtablesize ()
-can return any of the errors described for
-.BR getrlimit (2);
-see NOTES below.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface      Attribute       Value
-T{
-.na
-.nh
-.BR getdtablesize ()
-T}     Thread safety   MT-Safe
-.TE
-.SH VERSIONS
-The glibc version of
-.BR getdtablesize ()
-calls
-.BR getrlimit (2)
-and returns the current
-.B RLIMIT_NOFILE
-limit, or
-.B OPEN_MAX
-when that fails.
-.\" The libc4 and libc5 versions return
-.\" .B OPEN_MAX
-.\" (set to 256 since Linux 0.98.4).
-.P
-Portable applications should employ
-.I sysconf(_SC_OPEN_MAX)
-instead of this call.
-.SH STANDARDS
-None.
-.SH HISTORY
-SVr4, 4.4BSD
-(first appeared in 4.2BSD).
-.SH SEE ALSO
-.BR close (2),
-.BR dup (2),
-.BR getrlimit (2),
-.BR open (2)