getdtablesize(3) - NetBSD Manual Pages

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GETDTABLESIZE(3)        NetBSD 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 ta-
     ble 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.

NetBSD 10.1                     January 5, 2012                    NetBSD 10.1