getdtablesize(3) [netbsd man page]

GETDTABLESIZE(3)					   BSD Library Functions Manual 					  GETDTABLESIZE(3)

NAME

     getdtablesize -- get descriptor table size

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     getdtablesize(void);

DESCRIPTION

     The getdtablesize function is an equivalent of sysconf() with _SC_OPEN_MAX.

SEE ALSO

     close(2), dup(2), getrlimit(2), open(2), select(2), sysconf(3)

HISTORY

     The getdtablesize() function call appeared in 4.2BSD.

     Historically, each process had a fixed size descriptor table, which is guaranteed to have at least 20 slots.  The entries in the descriptor
     table are numbered with small integers starting at 0.  The call getdtablesize() used to return the size of this table.  It doesn't make much
     sense these days because the size of the table is dynamic.

BSD
								  January 5, 2012							       BSD

getdtablesize(2)						System Calls Manual						  getdtablesize(2)

NAME

       getdtablesize - Gets the descriptor table size

SYNOPSIS

       #include <unistd.h>

       int getdtablesize ( void );

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       getdtablesize(): XPG4-UNIX

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

DESCRIPTION

       The  getdtablesize()  function  returns the total number of file descriptors in a process' descriptor table.  Each process has a fixed size
       descriptor table that is guaranteed to have at least 64 slots. The entries in the descriptor table are numbered with small integers  start-
       ing at 0 (zero).

       The  getdtablesize()  function  returns	the total number of file descriptors that a process can have open simultaneously.  Each process is
       limited to a fixed number of open file descriptors.  This limit is at least 64.	The system  defined  limit  is	configurable.	If  it	is
       greater than 64, the system will allocate more file descriptors for a process up to the defined maximum.

RETURN VALUES

       The getdtablesize() function returns the size of the descriptor table, and is always successful.

RELATED INFORMATION

       Functions: close(2), open(2), select(2)

       Standards: standards(5) delim off

																  getdtablesize(2)