GETDTABLESIZE(2)          FreeBSD 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
     descriptor 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(3)

HISTORY
     The getdtablesize() system call appeared in 4.2BSD.

FreeBSD 13.1-RELEASE-p6         April 24, 2013         FreeBSD 13.1-RELEASE-p6