file_fadvise.c

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    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 }

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/tests/zfs-tests/cmd/file/file_fadvise.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/tests/zfs-tests/cmd/file/file_fadvise.c