getdtablesize(3C)

NAME

     getdtablesize - get the file descriptor table size

SYNOPSIS

     #include <unistd.h>

     int getdtablesize(void);

DESCRIPTION

     The getdtablesize() function is equivalent  to  getrlimit(2)
     with the RLIMIT_NOFILE option.

RETURN VALUES

     The getdtablesize() function returns the current soft  limit
     as   if  obtained  from  a  call  to  getrlimit()  with  the
     RLIMIT_NOFILE option.

ERRORS

     No errors are defined.

USAGE

     There is no direct relationship between the  value  returned
     by getdtablesize() and OPEN_MAX defined in <limits.h>.

     Each process has a file 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
     getdtablesize() function returns the current maximum size of
     this table by calling the getrlimit() function.

SEE ALSO

     close(2), getrlimit(2), open(2), setrlimit(2), select(3C)