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FreeBSD 11.0 - man page for getdtablesize (freebsd section 2)

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

NAME
getdtablesize -- get file descriptor limit
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h> int getdtablesize(void);
DESCRIPTION
The getdtablesize() system call returns the maximum number of file descriptors that the current process may open. The maximum file descrip- tor number that the system may assign is the return value minus one. Existing file descriptor numbers may be higher if the limit was lowered after they were opened.
SEE ALSO
close(2), closefrom(2), dup(2), getrlimit(2), sysconf(2)
HISTORY
The getdtablesize() system call appeared in 4.2BSD.
BSD
April 24, 2013 BSD