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streamtab(9s) [centos man page]

streamtab(9S)						    Data Structures for Drivers 					     streamtab(9S)

streamtab - STREAMS entity declaration structure SYNOPSIS
#include <sys/stream.h> INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). DESCRIPTION
Each STREAMS driver or module must have a streamtab structure. streamtab is made up of qinit structures for both the read and write queue portions of each module or driver. Multiplexing drivers require both upper and lower qinit structures. The qinit structure contains the entry points through which the module or driver routines are called. Normally, the read QUEUE contains the open and close routines. Both the read and write queue can contain put and service procedures. STRUCTURE MEMBERS
struct qinit *st_rdinit; /* read QUEUE */ struct qinit *st_wrinit; /* write QUEUE */ struct qinit *st_muxrinit; /* lower read QUEUE*/ struct qinit *st_muxwinit; /* lower write QUEUE*/ SEE ALSO
qinit(9S) STREAMS Programming Guide SunOS 5.10 11 Apr 1991 streamtab(9S)

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strmod_add(2)							System Calls Manual						     strmod_add(2)

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)
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