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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 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).

       ┌────────────────┬───────────────┬─────────┐
       │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)

COLOPHON
       This page is part of release 4.14 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
       https://www.kernel.org/doc/man-pages/.

Linux				  2016-03-15		      GETDTABLESIZE(3)

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