Description

   The getdtablesize function returns the total number of file
   descriptors that a process can have open simultaneously. Each
   process is limited to a fixed number of open file descriptors.

   The number of file descriptors that a process can have open is
   the minumum of the following:

   o  C RTL open file limit-65535 on OpenVMS Alpha and
      Integrity servers.

   o  SYSGEN CHANNELCNT parameter-permanent I/O channel count.

   o  Process open file quota FILLM parameter-number of open files
      that can be opened by a process at one time.