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ct_event_read(3CONTRAContract Management Library Functct_event_read(3CONTRACT)

NAME
       ct_event_read,  ct_event_read_critical,	ct_event_reset, ct_event_reli‐
       able,	 ct_event_free,	    ct_event_get_flags,	    ct_event_get_ctid,
       ct_event_get_evid,	 ct_event_get_type,	   ct_event_get_nevid,
       ct_event_get_newct - common contract event functions

SYNOPSIS
       cc [ flag... ] file... -D_LARGEFILE64_SOURCE -lcontract [ library... ]
       #include <libcontract.h>

       int ct_event_read(int fd, ct_evthdl_t *evthndlp);

       int ct_event_read_critical(int fd, ct_evthdl_t *evthndlp);

       int ct_event_reset(int fd);

       int ct_event_reliable(int fd);

       void ct_event_free(ct_evthdl_t evthndl);

       ctid_t ct_event_get_ctid(ct_evthdl_t evthndl);

       ctevid_t ct_event_get_evid(ct_evthdl_t evthndl);

       uint_t ct_event_get_flags(ct_evthdl_t evthndl);

       uint_t ct_event_get_type(ct_evthdl_t evthndl);

       int ct_event_get_nevid(ct_evthdl_t evthndl, ctevid_t *evidp);

       int ct_event_get_newct(ct_evthdl_t evthndl, ctid_t *ctidp);

DESCRIPTION
       These functions operate on contract  event  endpoint  file  descriptors
       obtained	 from  the  contract(4)	 file  system and event object handles
       returned by ct_event_read() and ct_event_read_critical().

       The ct_event_read() function reads the next event from the queue refer‐
       enced by the file descriptor fd and initializes the event object handle
       pointed to by evthndlp. After a successful call to ct_event_read(), the
       caller  is responsible for calling ct_event_free() on this event object
       handle when it has finished using it.

       The  ct_event_read_critical()  function	behaves	 like  ct_event_read()
       except  that  it reads the next critical event from the queue, skipping
       any intermediate events.

       The ct_event_reset() function resets the location of  the  listener  to
       the  beginning  of  the	queue.	This  function	can be used to re-read
       events, or read events that were sent before  the  event	 endpoint  was
       opened.	Informative  and  acknowledged critical events, however, might
       have been removed from the queue.

       The ct_event_reliable() function indicates that no event	 published  to
       the  specified  event  queue  should be dropped by the system until the
       specified listener has read the event. This function requires that  the
       caller have the {PRIV_CONTRACT_EVENT} privilege in its effective set.

       The  ct_event_free()  function  frees  any  storage associated with the
       event object handle specified by evthndl.

       The ct_event_get_ctid() function returns the ID of  the	contract  that
       sent the specified event.

       The ct_event_get_evid() function returns the ID of the specified event.

       The ct_event_get_flags() function returns the event flags for the spec‐
       ified event. Valid event flags are:

       CTE_INFO	       The event is an informative event.

       CTE_ACK	       The event has been acknowledged (for critical and nego‐
		       tiation messages).

       CTE_NEG	       The message represents an exit negotiation.

       The ct_event_get_type() function reads the event type. The value is one
       of the event types described in contract(4) or the contract type's man‐
       ual page.

	The  ct_event_get_nevid()  function  reads  the negotiation ID from an
       CT_EV_NEGEND event.

       The ct_event_get_newct() function obtains the ID of the	contract  cre‐
       ated  when  the	negotiation  referenced by the CT_EV_NEGEND event suc‐
       ceeded. If no contract was created, ctidp will be 0.  If the  operation
       was cancelled, *ctidp will equal the ID of the existing contract.

RETURN VALUES
       Upon  successful completion, ct_event_read(), ct_event_read_critical(),
       ct_event_reset(),   ct_event_reliable(),	  ct_event_get_nevid(),	   and
       ct_event_get_newct()  return 0. Otherwise, they return a non-zero error
       value.

       The ct_event_get_flags(), ct_event_get_ctid(), ct_event_get_evid(), and
       ct_event_get_type()  functions return data as described in the DESCRIP‐
       TION.

ERRORS
       The ct_event_reliable() function will fail if:

       EPERM	       The caller does not have {PRIV_CONTRACT_EVENT}  in  its
		       effective set.

       The  ct_event_read()  and  ct_event_read_critical() functions will fail
       if:

       EAGAIN	       The event endpoint was opened O_NONBLOCK and no	appli‐
		       cable events were available to be read.

       The  The	 ct_event_get_nevid()  and ct_event_get_newct() functions will
       fail if:

       EINVAL	       The  evthndl  argument  is  not	a  CT_EV_NEGEND	 event
		       object.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Evolving			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │MT-Level		     │Safe			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       libcontract(3LIB), contract(4), attributes(5), lfcompile(5)

SunOS 5.10			  1 Apr 2004	      ct_event_read(3CONTRACT)
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