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strmod_add(2)
NAME
  strmod_add - Adds STREAMS modules and drivers

SYNOPSIS
  #include <sys/stream.h>
  dev_t strmod_add (
	  dev_t devno,
	  struct streamtab *streamtab,
	  struct streamadm *streamadm);

PARAMETERS
  devno
      The device number (cdevsw slot) to use when adding a driver.  If NODEV
      is supplied, the first available slot is used.  This parameter is
      ignored for modules.

  streamtab
      A pointer to the streamtab  structure that contains the entry points.
      The actual streamtab structure has to be allocated permanently in the
      driver's data space (as specified by System V Release 3.2).

  streamadm
      A pointer to the streamadm  structure that contains the administration
      parameters for the STREAMS module or driver.  The actual streamadm
      structure is needed only for the duration of the call.  It does not
      have to be allocated permanently by the caller.

DESCRIPTION
  The strmod_add() interface is used to configure STREAMS modules and drivers
  into the kernel.  Specifically, it allows STREAMS drivers to add entry
  points in character device switch tables.  Modules are added to the STREAMS
  modules switch.

  When adding a driver only, strmod_add() takes a device number, which is
  used to determine the device switch slot for the entry points.  A STREAMS
  driver can supply NODEV instead of a device number.  In this case,
  strmod_add() finds the first available device switch slot and returns the
  number actually used.	 If a device switch slot is already in use or if
  there are no slots available, NODEV is returned.

  The streamtab parameter is a pointer to a traditional (System V Release
  3.2) streamtab structure.  The structure contains pointers to entry points
  for the module's read and write queue routines.

  The streamadm points to a streamadm structure.  The streamadm structure
  provides additional information that is required under Tru64 UNIX.



NOTES
  The device number can be constructed from the major number through the
  makedev  macro, which is defined in /usr/include/sys/types.h.


RETURN VALUES
  Upon successful completion, strmod_add() returns the device number
  associated with the device switch table.  Otherwise, it returns NODEV.

RELATED INFORMATION
  Data Structures: streamadm(4)

  Routines: strmod_del(2)

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