tools/regression/aio/kqueue/aio_kqueue.c

   1 /*-
   2  * Copyright (C) 2005 IronPort Systems, Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  *
  25  * $FreeBSD$
  26  */
  27
  28 /*
  29  * Prerequisities:
  30  * - AIO support must be compiled into the kernel (see sys/<arch>/NOTES for
  31  *   more details).
  32  *
  33  * Note: it is a good idea to run this against a physical drive to
  34  * exercise the physio fast path (ie. aio_kqueue /dev/<something safe>)
  35  */
  36
  37 #include <sys/types.h>
  38 #include <sys/event.h>
  39 #include <sys/time.h>
  40 #include <aio.h>
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <fcntl.h>
  44 #include <stdlib.h>
  45 #include <stdio.h>
  46 #include <string.h>
  47 #include <unistd.h>
  48
  49 #define PATH_TEMPLATE   "/tmp/aio.XXXXXXXXXX"
  50
  51 #define MAX 128
  52 #define MAX_RUNS 300
  53 /* #define DEBUG */
  54
  55 int
  56 main (int argc, char *argv[])
  57 {
  58         int fd;
  59         struct aiocb *iocb[MAX], *kq_iocb;
  60         int i, result, run, error, j;
  61         char buffer[32768];
  62         int kq = kqueue();
  63         struct kevent ke, kq_returned;
  64         struct timespec ts;
  65         int cancel, pending, tmp_file = 0, failed = 0;
  66         char *file, pathname[sizeof(PATH_TEMPLATE)+1];
  67
  68         if (kq < 0) {
  69                 perror("No kqeueue\n");
  70                 exit(1);
  71         }
  72
  73         if (argc == 1) {
  74                 strcpy(pathname, PATH_TEMPLATE);
  75                 fd = mkstemp(pathname);
  76                 file = pathname;
  77                 tmp_file = 1;
  78         } else {
  79                 file = argv[1];
  80                 fd = open(file, O_RDWR|O_CREAT, 0666);
  81         }
  82         if (fd == -1)
  83                 err(1, "Can't open %s\n", file);
  84
  85         for (run = 0; run < MAX_RUNS; run++){
  86 #ifdef DEBUG
  87                 printf("Run %d\n", run);
  88 #endif
  89                 for (i = 0; i < MAX; i++) {
  90                         iocb[i] = (struct aiocb *)calloc(1,
  91                             sizeof(struct aiocb));
  92                         if (iocb[i] == NULL)
  93                                 err(1, "calloc");
  94                 }
  95
  96                 pending = 0;
  97                 for (i = 0; i < MAX; i++) {
  98                         pending++;
  99                         iocb[i]->aio_nbytes = sizeof(buffer);
 100                         iocb[i]->aio_buf = buffer;
 101                         iocb[i]->aio_fildes = fd;
 102                         iocb[i]->aio_offset = iocb[i]->aio_nbytes * i * run;
 103
 104                         iocb[i]->aio_sigevent.sigev_notify_kqueue = kq;
 105                         iocb[i]->aio_sigevent.sigev_value.sival_ptr = iocb[i];
 106                         iocb[i]->aio_sigevent.sigev_notify = SIGEV_KEVENT;
 107
 108                         result = aio_write(iocb[i]);
 109                         if (result != 0) {
 110                                 perror("aio_write");
 111                                 printf("Result %d iteration %d\n", result, i);
 112                                 exit(1);
 113                         }
 114 #ifdef DEBUG
 115                         printf("WRITE %d is at %p\n", i, iocb[i]);
 116 #endif
 117                         result = rand();
 118                         if (result < RAND_MAX/32) {
 119                                 if (result > RAND_MAX/64) {
 120                                         result = aio_cancel(fd, iocb[i]);
 121 #ifdef DEBUG
 122                                         printf("Cancel %d %p result %d\n", i, iocb[i], result);
 123 #endif
 124                                         if (result == AIO_CANCELED) {
 125                                                 aio_return(iocb[i]);
 126                                                 iocb[i] = NULL;
 127                                                 pending--;
 128                                         }
 129                                 }
 130                         }
 131                 }
 132                 cancel = MAX - pending;
 133
 134                 i = 0;
 135                 while (pending) {
 136
 137                         for (;;) {
 138
 139                                 bzero(&ke, sizeof(ke));
 140                                 bzero(&kq_returned, sizeof(ke));
 141                                 ts.tv_sec = 0;
 142                                 ts.tv_nsec = 1;
 143                                 result = kevent(kq, NULL, 0,
 144                                                 &kq_returned, 1, &ts);
 145                                 error = errno;
 146                                 if (result < 0)
 147                                         perror("kevent error: ");
 148                                 kq_iocb = kq_returned.udata;
 149 #ifdef DEBUG
 150                                 printf("kevent %d %d errno %d return.ident %p "
 151                                        "return.data %p return.udata %p %p\n",
 152                                        i, result, error,
 153                                        kq_returned.ident, kq_returned.data,
 154                                        kq_returned.udata,
 155                                        kq_iocb);
 156 #endif
 157
 158                                 if (kq_iocb)
 159                                         break;
 160 #ifdef DEBUG
 161                                 printf("Try again left %d out of %d %d\n",
 162                                     pending, MAX, cancel);
 163 #endif
 164                         }
 165
 166                         for (j = 0; j < MAX && iocb[j] != kq_iocb;
 167                            j++) ;
 168 #ifdef DEBUG
 169                         printf("kq_iocb %p\n", kq_iocb);
 170
 171                         printf("Error Result for %d is %d pending %d\n",
 172                             j, result, pending);
 173 #endif
 174                         result = aio_return(kq_iocb);
 175 #ifdef DEBUG
 176                         printf("Return Result for %d is %d\n\n", j, result);
 177 #endif
 178                         if (result != sizeof(buffer)) {
 179                                 printf("FAIL: run %d, operation %d, result %d "
 180                                     " (errno=%d) should be %d\n", run, pending,
 181                                     result, errno, sizeof(buffer));
 182                                 failed++;
 183                         } else
 184                                 printf("PASS: run %d, left %d\n", run,
 185                                     pending - 1);
 186
 187                         free(kq_iocb);
 188                         iocb[j] = NULL;
 189                         pending--;
 190                         i++;
 191                 }
 192
 193                 for (i = 0; i < MAX; i++)
 194                         free(iocb[i]);
 195
 196         }
 197
 198         if (tmp_file)
 199                 unlink(pathname);
 200
 201         if (failed != 0)
 202                 printf("FAIL: %d tests failed\n", failed);
 203         else
 204                 printf("PASS: All tests passed\n");
 205
 206         exit (failed == 0 ? 0 : 1);
 207 }