SYSEVENT_BIND_HANDLE(3SYSEVENT)SYSEVENT_BIND_HANDLE(3SYSEVENT)NAME
sysevent_bind_handle, sysevent_unbind_handle - bind or unbind sub‐
scriber handle
SYNOPSIS
cc [flag...] file ... -lsysevent [library ...]
#include <libsysevent.h>
sysevent_handle_t *sysevent_bind_handle(void (*event_handler)
(sysevent_t *ev));
void sysevent_unbind_handle(sysevent_handle_t *sysevent_hdl);
PARAMETERS
ev
pointer to sysevent buffer handle
event_handler
pointer to an event handling function
sysevent_hdl
pointer to a sysevent subscriber handle
DESCRIPTION
The sysevent_bind_handle() function allocates memory associated with a
subscription handle and binds it to the caller's event_handler. The
event_handler is invoked during subsequent system event notifications
once a subscription has been made with sysevent_subscribe_event(3SYSEV‐
ENT).
The system event is represented by the argument ev and is passed as an
argument to the invoked event delivery function, event_handler.
Additional threads are created to service communication between sysev‐
entd(1M) and the calling process and to run the event handler routine,
event_handler.
The sysevent_unbind_handle() function deallocates memory and other
resources associated with a subscription handle and deactivates all
system event notifications for the calling process. All event notifi‐
cations are guaranteed to stop upon return from sysevent_unbind_han‐
dle().
RETURN VALUES
The sysevent_bind_handle() function returns a valid sysevent subscriber
handle if the handle is successfully allocated. Otherwise, NULL is
returned and errno is set to indicate the error.
The sysevent_unbind_handle() function returns no value.
ERRORS
The sysevent_bind_handle() function will fail if:
EACCES
The calling process has an ID other than the privileged user.
EBUSY
There are no resources available.
EINVAL
The pointer to the function event_handler is NULL.
EMFILE
The process has too many open descriptors.
ENOMEM
There are insufficient resources to allocate the handle.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬─────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼─────────────────┤
│Interface Stability │ Committed │
├────────────────────┼─────────────────┤
│MT-Level │ MT-Safe │
└────────────────────┴─────────────────┘
SEE ALSOsyseventd(1M), sysevent_subscribe_event(3SYSEVENT), attributes(5)NOTES
Event notifications are revoked by syseventd when the bound process
dies. Event notification is suspended if a signal is caught and han‐
dled by the event_handler thread. Event notification is also suspended
when the calling process attempts to use fork(2) or fork1(2). Event
notifications might be lost during suspension periods.
The libsysevent interfaces do not work at all in non-global zones.
Jul 24, 2009 SYSEVENT_BIND_HANDLE(3SYSEVENT)
