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Linux 2.6 - man page for getdtablesize (linux section 3)

GETDTABLESIZE(3)					     Linux Programmer's Manual						  GETDTABLESIZE(3)

NAME
getdtablesize - get file descriptor table size
SYNOPSIS
#include <unistd.h> int getdtablesize(void); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): getdtablesize(): Since glibc 2.12: /* Glibc since 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || ! (_POSIX_C_SOURCE >= 200112L) Before glibc 2.12: _BSD_SOURCE || _XOPEN_SOURCE >= 500
DESCRIPTION
getdtablesize() returns the maximum number of files a process can have open, one more than the largest possible value for a file descrip- tor.
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.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +----------------+---------------+---------+ |Interface | Attribute | Value | +----------------+---------------+---------+ |getdtablesize() | Thread safety | MT-Safe | +----------------+---------------+---------+
CONFORMING TO
SVr4, 4.4BSD (the getdtablesize() function first appeared in 4.2BSD). It is not specified in POSIX.1; 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.
SEE ALSO
close(2), dup(2), getrlimit(2), open(2) Linux 2016-03-15 GETDTABLESIZE(3)

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