How to check number of first slot on the MO or TAPE device?

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LEARN ABOUT OSF1

strmod_add

strmod_add(2)							System Calls Manual						     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

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

																     strmod_add(2)

Programming