NAME¶

getdtablesize - get descriptor table size

SYNOPSIS¶

#include <unistd.h> int getdtablesize(void);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
getdtablesize():

DESCRIPTION¶

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.

ATTRIBUTES¶

Multithreading (see pthreads(7))¶

The getdtablesize() function is thread-safe.

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.

SEE ALSO¶

close(2), dup(2), getrlimit(2), open(2)

COLOPHON¶

This page is part of release 3.74 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.