Man page - getdtablesize(3)

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Manual

getdtablesize

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
VERSIONS
STANDARDS
HISTORY
SEE ALSO

NAME

getdtablesize - get file descriptor table size

LIBRARY

Standard C library ( libc , -lc )

SYNOPSIS

#include <unistd.h>

int getdtablesize(void);

Feature Test Macro Requirements for glibc (see feature_test_macros (7)):

getdtablesize ():
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

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 VERSIONS below.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes (7).

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VERSIONS

The glibc version of getdtablesize () calls getrlimit (2) and returns the current RLIMIT_NOFILE limit, or OPEN_MAX when that fails.

Portable applications should employ sysconf(_SC_OPEN_MAX) instead of this call.

STANDARDS

None.

HISTORY

SVr4, 4.4BSD (first appeared in 4.2BSD).

SEE ALSO

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