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'\" te .\" Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved. .TH sysevent_subscribe_event 3SYSEVENT "24 Jul 2009" "Oracle Solaris 11.4" "System Event Library Functions" .SH NAME sysevent_subscribe_event, sysevent_unsubscribe_event \- register or unregister interest in event receipt .SH SYNOPSIS .LP .nf \fBcc\fR [ \fIflag\fR... ] \fIfile\fR... \fB-lsysevent\fR [ \fIlibrary\fR... ] #include <libsysevent.h> \fBint\fR \fBsysevent_subscribe_event\fR(\fBsysevent_handle_t *\fR\fIsysevent_hdl\fR, \fBchar *\fR\fIevent_class\fR, \fBchar **\fR\fIevent_subclass_list\fR, \fBint\fR \fInum_subclasses\fR); .fi .LP .nf \fBvoid\fR \fBsysevent_unsubscribe_event\fR(\fBsysevent_handle_t *\fR\fIsysevent_hdl\fR, \fBchar *\fR\fIevent_class\fR); .fi .SH PARAMETERS .sp .ne 2 .mk .na \fB\fIevent_class\fR\fR .ad .RS 23n .rt system event class string .RE .sp .ne 2 .mk .na \fB\fIevent_subclass_list\fR\fR .ad .RS 23n .rt array of subclass strings .RE .sp .ne 2 .mk .na \fB\fInum_subclasses\fR\fR .ad .RS 23n .rt number of subclass strings .RE .sp .ne 2 .mk .na \fB\fIsysevent_hdl\fR\fR .ad .RS 23n .rt \fBsysevent\fR subscriber handle .RE .SH DESCRIPTION .sp .LP The \fBsysevent_subscribe_event()\fR function registers the caller's interest in event notifications belonging to the class \fIevent_class\fR and the subclasses contained in \fIevent_subclass_list\fR. The subscriber handle \fIsysevent_hdl\fR is updated with the new subscription and the calling process receives event notifications from the event handler specified in \fIsysevent_bind_handle\fR. .sp .LP System events matching \fIevent_class\fR and a subclass contained in \fIevent_subclass_list\fR published after the caller returns from \fBsysevent_subscribe_event()\fR are guaranteed to be delivered to the calling process. Matching system events published and queued prior to a call to \fBsysevent_subscribe_event()\fR may be delivered to the process's event handler. .sp .LP The \fInum_subclasses\fR argument provides the number of subclass string elements in \fIevent_subclass_list\fR. .sp .LP A caller can use the event class \fBEC_ALL\fR to subscribe to all event classes and subclasses. The event class \fBEC_SUB_ALL\fR can be used to subscribe to all subclasses within a given event class. .sp .LP Subsequent calls to \fBsysevent_subscribe_event()\fR are allowed to add additional classes or subclasses. To remove an existing subscription, \fBsysevent_unsubscribe_event()\fR must be used to remove the subscription. .sp .LP The \fBsysevent_unsubscribe_event()\fR function removes the subscription described by \fIevent_class\fR for \fIsysevent_hdl\fR. Event notifications matching event_class will not be delivered to the calling process upon return. .sp .LP A caller can use the event class \fBEC_ALL\fR to remove all subscriptions for \fIsysevent_hdl\fR. .sp .LP The library manages all subscription resources. .SH RETURN VALUES .sp .LP The \fBsysevent_subscribe_event()\fR function returns 0 if the subscription is successful. Otherwise, \(mi1 is returned and \fBerrno\fR is set to indicate the error. .sp .LP The \fBsysevent_unsubscribe_event()\fR function returns no value. .SH ERRORS .sp .LP The \fBsysevent_subscribe_event()\fR function will fail if: .sp .ne 2 .mk .na \fB\fBEACCES\fR\fR .ad .RS 10n .rt The calling process has an ID other than the privileged user. .RE .sp .ne 2 .mk .na \fB\fBEINVAL\fR\fR .ad .RS 10n .rt The \fIsysevent_hdl\fR argument is an invalid \fBsysevent\fR handle. .RE .sp .ne 2 .mk .na \fB\fBENOMEM\fR\fR .ad .RS 10n .rt There is insufficient memory available to allocate subscription resources. .RE .SH EXAMPLES .LP \fBExample 1\fR Subscribing for environmental events .sp .in +2 .nf #include <libsysevent.h> #include <sys/nvpair.h> static int32_t attr_int32; #define CLASS1 "class1" #define CLASS2 "class2" #define SUBCLASS_1 "subclass_1" #define SUBCLASS_2 "subclass_2" #define SUBCLASS_3 "subclass_3" #define MAX_SUBCLASS 3 static void event_handler(sysevent_t *ev) { nvlist_t *nvlist; /* * Special processing for events (CLASS1, SUBCLASS_1) and * (CLASS2, SUBCLASS_3) */ if ((strcmp(CLASS1, sysevent_get_class_name(ev)) == 0 && strcmp(SUBCLASS_1, sysevent_get_subclass_name(ev)) == 0) || (strcmp(CLASS2, sysevent_get_subclass_name(ev) == 0) && strcmp(SUBCLASS_3, sysevent_get_subclass(ev)) == 0)) { if (sysevent_get_attr_list(ev, &nvlist) != 0) return; if (nvlist_lookup_int32(nvlist, "my_int32_attr", &attr_int32) != 0) return; /* Event Processing */ } else { /* Event Processing */ } } int main(int argc, char **argv) { sysevent_handle_t *shp; const char *subclass_list[MAX_SUBCLASS]; /* Bind event handler and create subscriber handle */ shp = sysevent_bind_handle(event_handler); if (shp == NULL) exit(1); /* Subscribe to all CLASS1 event notifications */ subclass_list[0] = EC_SUB_ALL; if (sysevent_subscribe_event(shp, CLASS1, subclass_list, 1) != 0) { sysevent_unbind_handle(shp); exit(1); } /* Subscribe to CLASS2 events for subclasses: SUBCLASS_1, * SUBCLASS_2 and SUBCLASS_3 */ subclass_list[0] = SUBCLASS_1; subclass_list[1] = SUBCLASS_2; subclass_list[2] = SUBCLASS_3; if (sysevent_subscribe_event(shp, CLASS2, subclass_list, MAX_SUBCLASS) != 0) { sysevent_unbind_handle(shp); exit(1); } for (;;) { (void) pause(); } } .fi .in -2 .sp .SH ATTRIBUTES .sp .LP See \fBattributes\fR(7) for descriptions of the following attributes: .sp .TS tab( ) box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Committed _ MT-Level MT-Safe .TE .sp .SH SEE ALSO .sp .LP \fBsysevent_bind_handle\fR(3SYSEVENT), \fBsysevent_get_attr_list\fR(3SYSEVENT), \fBsysevent_get_class_name\fR(3SYSEVENT), \fBsysevent_get_vendor_name\fR(3SYSEVENT), \fBattributes\fR(7), \fBsyseventd\fR(8) .SH NOTES .sp .LP The \fBlibsysevent\fR interfaces do not work at all in non-global zones.