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NAME

        getdtablesize - get descriptor table size

SYNOPSIS

        #include <unistd.h>
 
        int getdtablesize(void);

DESCRIPTION

        getdtablesize()  returns the maximum number of files a process can have
        open, one more than the largest possible value for a file descriptor.
        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.
        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).
        close(2), dup(2), getrlimit(2), open(2)