/*
* Copyright (c) 2019-2021 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <stddef.h>
#include <stdint.h>
#include <errno.h>
#include <skywalk/os_packet.h>
#include <skywalk/os_channel_event.h>
#ifndef LIBSYSCALL_INTERFACE
#error "LIBSYSCALL_INTERFACE not defined"
#endif /* !LIBSYSCALL_INTERFACE */
int
os_channel_event_get_next_event(const os_channel_event_handle_t event_handle,
const os_channel_event_t prev_event, os_channel_event_t *event)
{
struct __kern_channel_event *cev, *pev;
buflet_t buflet;
uint16_t bdlen;
char *baddr, *estart;
*event = NULL;
if (!event_handle) {
return EINVAL;
}
buflet = os_packet_get_next_buflet(event_handle, NULL);
if (__improbable(buflet == NULL)) {
return EINVAL;
}
baddr = os_buflet_get_object_address(buflet);
if (__improbable(baddr == NULL)) {
return ENXIO;
}
bdlen = os_buflet_get_data_length(buflet);
baddr += os_buflet_get_data_offset(buflet);
estart = baddr + __KERN_CHANNEL_EVENT_OFFSET;
pev = (struct __kern_channel_event *)prev_event;
if (pev == NULL) {
cev = (struct __kern_channel_event *)estart;
} else {
if ((pev->ev_flags & CHANNEL_EVENT_FLAG_MORE_EVENT) == 0) {
return ENODATA;
}
cev = (struct __kern_channel_event *)((char *)pev + sizeof(*pev) +
pev->ev_dlen);
}
if (__improbable((char *)cev < estart)) {
return ENXIO;
}
if (__improbable((cev->ev_dlen + (char *)cev) > (baddr + bdlen))) {
return ENXIO;
}
*event = (os_channel_event_t)cev;
return 0;
}
int
os_channel_event_get_event_data(const os_channel_event_t event,
struct os_channel_event_data *event_data)
{
struct __kern_channel_event *kev;
if (__improbable(event == 0 || event_data == NULL)) {
return EINVAL;
}
kev = (struct __kern_channel_event *)event;
if (__improbable(kev->ev_type < CHANNEL_EVENT_MIN ||
kev->ev_type > CHANNEL_EVENT_MAX)) {
return ENXIO;
}
event_data->event_type = kev->ev_type;
event_data->event_more =
(kev->ev_flags & CHANNEL_EVENT_FLAG_MORE_EVENT) != 0;
event_data->event_data_length = kev->ev_dlen;
event_data->event_data = kev->ev_data;
return 0;
}