/*-
 * Copyright (C) 2005 IronPort Systems, Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD$
 */

/* 
 * Note: it is a good idea to run this against a physical drive to 
 * exercise the physio fast path (ie. aio_kqueue /dev/<something safe>)
 */

#include <aio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>
#include <unistd.h>

#define PATH_TEMPLATE   "/tmp/aio.XXXXXXXXXX"

#define MAX 128
#define MAX_RUNS 300
/* #define DEBUG */

main(int argc, char *argv[]){
	int fd;
	struct aiocb *iocb[MAX], *kq_iocb;
	int i, result, run, error, j;
	char buffer[32768];
	int kq = kqueue();
	struct kevent ke, kq_returned;
	struct timespec ts;
	int cancel, pending, tmp_file = 0, failed = 0;
	char *file, pathname[sizeof(PATH_TEMPLATE)-1];

	if (kq < 0) {
		perror("No kqeueue\n");
		exit(1);
	}

	if (argc == 1) { 
		strcpy(pathname, PATH_TEMPLATE);
		fd = mkstemp(pathname);
		file = pathname;
		tmp_file = 1;
	} else {
		file = argv[1];
		fd = open(file, O_RDWR|O_CREAT, 0666);
	}
	if (fd < 0){
		fprintf(stderr, "Can't open %s\n", file);
		perror("");
		exit(1);
	}

	for (run = 0; run < MAX_RUNS; run++){
#ifdef DEBUG
		printf("Run %d\n", run);
#endif
		for(i = 0; i < MAX; i++) {
			iocb[i] = (struct aiocb *)malloc(sizeof(struct aiocb));
			bzero(iocb[i], sizeof(struct aiocb));
		}
		
		pending = 0;	
		for(i = 0; i < MAX; i++) {
			pending++;
			iocb[i]->aio_nbytes = sizeof(buffer);
			iocb[i]->aio_buf = buffer;
			iocb[i]->aio_fildes = fd;
			iocb[i]->aio_offset = iocb[i]->aio_nbytes * i * run;
			
			iocb[i]->aio_sigevent.sigev_notify_kqueue = kq;
			iocb[i]->aio_sigevent.sigev_value.sival_ptr = iocb[i];
			iocb[i]->aio_sigevent.sigev_notify = SIGEV_KEVENT;
			
			result = aio_write(iocb[i]);
			if (result != 0) {
				perror("aio_write");
				printf("Result %d iteration %d\n",result, i);
				exit(1);
			}
#ifdef DEBUG
			printf("WRITE %d is at %p\n", i, iocb[i]);
#endif
			result = rand();
			if (result < RAND_MAX/32) {
				if (result > RAND_MAX/64) {
					result = aio_cancel(fd, iocb[i]);
#ifdef DEBUG
					printf("Cancel %d %p result %d\n", i, iocb[i], result);
#endif
					if (result == AIO_CANCELED) {
						aio_return(iocb[i]);
						iocb[i]=NULL;
						pending--;
					}
				}
			}
		}
		cancel = MAX - pending;
		
		i = 0;
		while(pending) {
			for(;;) {
				bzero(&ke, sizeof(ke));
				bzero(&kq_returned, sizeof(ke));
				ts.tv_sec = 0;
				ts.tv_nsec = 1;
				result = kevent(kq, NULL, 0, 
						&kq_returned, 1, &ts);
				error = errno;
				if (result < 0) {
					perror("kevent error: ");
				}
				kq_iocb = kq_returned.udata;
#ifdef DEBUG
				printf("kevent %d %d errno %d return.ident %p "
				       "return.data %p return.udata %p %p\n", 
				       i, result, error, 
				       kq_returned.ident, kq_returned.data, 
				       kq_returned.udata, 
				       kq_iocb);
#endif
				
				if(kq_iocb)
					break;
#ifdef DEBUG
				printf("Try again left %d out of %d %d\n",pending, MAX, cancel);
#endif
			}			
			
			for(j = 0; j < MAX; j++) {
				if (iocb[j] == kq_iocb) {
					break;
				}
			}
#ifdef DEBUG
			printf("kq_iocb %p\n", kq_iocb);
			
			printf("Error Result for %d is %d pending %d\n", j, result, pending);
#endif
			result = aio_return(kq_iocb);
#ifdef DEBUG
			printf("Return Result for %d is %d\n", j, result);
			printf("\n");
#endif
			if (result != sizeof(buffer)) {
				printf("FAIL: run %d, operation %d, result %d (errno=%d) should be %d\n", run, pending, result, errno, sizeof(buffer));
				failed = 1;
			} else {
				printf("PASS: run %d, left %d\n", run, pending - 1);
			}

			free(kq_iocb);
			iocb[j] = NULL;
			pending--;
			i++;
		}	
	}

	if (tmp_file) {
		unlink(pathname);
	}

	if (failed) {
		printf("FAIL: Atleast one\n");
		exit(1);
	} else {
		printf("PASS: All\n");
		exit(0);
	}
}