/* IBM_PROLOG_BEGIN_TAG                                                   */
/* This is an automatically generated prolog.                             */
/*                                                                        */
/* $Source: clib/src/signal.c $                                           */
/*                                                                        */
/* OpenPOWER FFS Project                                                  */
/*                                                                        */
/* Contributors Listed Below - COPYRIGHT 2014,2015                        */
/* [+] International Business Machines Corp.                              */
/*                                                                        */
/*                                                                        */
/* Licensed under the Apache License, Version 2.0 (the "License");        */
/* you may not use this file except in compliance with the License.       */
/* You may obtain a copy of the License at                                */
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/*     http://www.apache.org/licenses/LICENSE-2.0                         */
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/* Unless required by applicable law or agreed to in writing, software    */
/* distributed under the License is distributed on an "AS IS" BASIS,      */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
/* implied. See the License for the specific language governing           */
/* permissions and limitations under the License.                         */
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/* IBM_PROLOG_END_TAG                                                     */

/*
 *   File: signal.c
 * Author: Shaun Wetzstein <shaun@us.ibm.com>
 *  Descr:
 *   Note:
 *   Date: 10/03/10
 */

#include <unistd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <malloc.h>
#include <stdint.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <limits.h>

#include "misc.h"
#include "signal.h"

/* ======================================================================= */

const char *__signal_msg[] = {
	"signal: unexpected NULL self pointer",
	"signal: unexpected NULL callback structure",
};

#define SIGNAL_NULL             (__signal_msg[0])

/* ======================================================================= */

void signal_init(signal_t * self)
{
	if (unlikely(self == NULL))
		throw_unexpected(SIGNAL_NULL);

	if (self->fd != -1)
		close(self->fd), self->fd = -1;

	sigemptyset(&self->mask);
	self->flags = SFD_CLOEXEC;

	self->fd = signalfd(self->fd, &self->mask, self->flags);
	if (unlikely(self->fd == -1))
		throw_errno(errno);
}

void signal_delete(signal_t * self)
{
	if (unlikely(self == NULL))
		throw_unexpected(SIGNAL_NULL);

	close(self->fd), self->fd = -1;

	if (sigprocmask(SIG_UNBLOCK, &self->mask, NULL) == -1)
		throw_errno(errno);

	sigemptyset(&self->mask);
	self->flags = 0;
}

int signal_fileno(signal_t * self)
{
	if (unlikely(self == NULL))
		throw_unexpected(SIGNAL_NULL);
	return self->fd;
}

int signal_setmask(signal_t * self, const sigset_t mask)
{
	if (unlikely(self == NULL))
		throw_unexpected(SIGNAL_NULL);

	self->mask = mask;

	if (sigprocmask(SIG_BLOCK, &self->mask, NULL) == -1)
		throw_errno(errno);

	self->fd = signalfd(self->fd, &self->mask, self->flags);
	if (unlikely(self->fd == -1))
		throw_errno(errno);

	return self->fd;
}

#if 0
void signal_wait1(signal_t * self)
{
	signal_wait2(self, -1);
}

void signal_wait2(signal_t * self, int timeout)
{
	if (unlikely(self == NULL))
		throw_unexpected(SIGNAL_NULL);

	struct epoll_event events[signal_EVENT_SIZE];

	int rc = epoll_wait(self->fd, events,
			    signal_EVENT_SIZE, timeout);

	for (int n = 0; n < rc; n++) {
		signal_callback *cb = (signal_callback *) events[n].data.ptr;
		if (cb != NULL)
			if (cb->func != NULL)
				cb->func((signal_event[1]) { {
					 events[n].data.u64 >> 32,
					 events[n].events}
					 }
					 , cb->data);
	}
}
#endif

/* ======================================================================= */