tests/zfs-tests/cmd/file/file_fadvise.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or https://opensource.org/licenses/CDDL-1.0.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*
  28  * Copyright (c) 2022 by Information2 Software, Inc. All rights reserved.
  29  */
  30
  31 #include "file_common.h"
  32 #include <sys/types.h>
  33 #include <unistd.h>
  34 #include <fcntl.h>
  35 #include <string.h>
  36
  37 /*
  38  * Call fadvise to prefetch data
  39  */
  40 static const char *execname = "file_fadvise";
  41
  42 static void
  43 usage(void)
  44 {
  45         (void) fprintf(stderr,
  46             "usage: %s -f filename -a advise \n", execname);
  47 }
  48
  49 int
  50 main(int argc, char *argv[])
  51 {
  52         char *filename = NULL;
  53         int advise = 0;
  54         int fd, ch;
  55         int     err = 0;
  56
  57         while ((ch = getopt(argc, argv, "a:f:")) != EOF) {
  58                 switch (ch) {
  59                 case 'a':
  60                         advise = atoll(optarg);
  61                         break;
  62                 case 'f':
  63                         filename = optarg;
  64                         break;
  65                 case '?':
  66                         (void) printf("unknown arg %c\n", optopt);
  67                         usage();
  68                         break;
  69                 }
  70         }
  71
  72         if (!filename) {
  73                 (void) printf("Filename not specified (-f <file>)\n");
  74                 err++;
  75         }
  76
  77         if (advise < POSIX_FADV_NORMAL || advise > POSIX_FADV_NOREUSE) {
  78                 (void) printf("advise is invalid\n");
  79                 err++;
  80         }
  81
  82         if (err) {
  83                 usage(); /* no return */
  84                 return (1);
  85         }
  86
  87         if ((fd = open(filename, O_RDWR, 0666)) < 0) {
  88                 perror("open");
  89                 return (1);
  90         }
  91
  92         if (posix_fadvise(fd, 0, 0, advise) != 0) {
  93                 perror("posix_fadvise");
  94                 close(fd);
  95                 return (1);
  96         }
  97
  98         close(fd);
  99
 100         return (0);
 101 }