Manpage of GETDTABLESIZE

GETDTABLESIZE

Section: Linux Programmer's Manual (3)
Updated: 2016-03-15
Index
 

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 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

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
getdtablesize() Thread safetyMT-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_NOFILElimit, or OPEN_MAXwhen that fails.  

SEE ALSO

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
CONFORMING TO
NOTES
SEE ALSO

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Time: 22:27:43 GMT, June 20, 2016