getdtablesize(2) [osx man page]

GETDTABLESIZE(2)					      BSD System Calls Manual						  GETDTABLESIZE(2)

NAME

     getdtablesize -- get descriptor table size

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     getdtablesize(void);

DESCRIPTION

     Each process has a fixed size descriptor table, which is guaranteed to have at least 20 slots.  The entries in the descriptor table are num-
     bered with small integers starting at 0.  The call getdtablesize() returns the size of this table.

LEGACY

     The getrlimit(2) function returns a value of type rlim_t.	This interface, returning an int, may have problems representing appropriate val-
     ues in the future.  Applications should use the getrlimit(2) function instead.

SEE ALSO

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

HISTORY

     The getdtablesize() function call appeared in 4.2BSD.

BSD
								   June 4, 1993 							       BSD

GETDTABLESIZE(2)					     Linux Programmer's Manual						  GETDTABLESIZE(2)

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(): _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.

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.  The libc4 and libc5 versions return OPEN_MAX (set to 256 since Linux 0.98.4).

SEE ALSO

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

COLOPHON

       This page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2007-07-26							  GETDTABLESIZE(2)