strmod_add - Adds STREAMS modules and drivers
dev_t strmod_add (
struct streamtab *streamtab,
struct streamadm *streamadm);
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 allocated 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.
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.
The device number can be constructed from the major number through the makedev macro, which is defined in /usr/include/sys/types.h.
Upon successful completion, strmod_add() returns the device number associated with the device switch table. Otherwise, it returns NODEV.
Data Structures: streamadm(4)
Routines: strmod_del(2) delim off