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// SPDX-License-Identifier: CDDL-1.0
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) 2022 by Information2 Software, Inc. All rights reserved.
*/
#include "file_common.h"
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
/*
* Call fadvise to prefetch data
*/
static const char *execname = "file_fadvise";
static void
usage(void)
{
(void) fprintf(stderr,
"usage: %s -f filename -a advice \n", execname);
}
typedef struct advice_name {
const char *name;
int value;
} advice_name;
static const struct advice_name table[] = {
#define ADV(name) {#name, name}
ADV(POSIX_FADV_NORMAL),
ADV(POSIX_FADV_RANDOM),
ADV(POSIX_FADV_SEQUENTIAL),
ADV(POSIX_FADV_WILLNEED),
ADV(POSIX_FADV_DONTNEED),
ADV(POSIX_FADV_NOREUSE),
{NULL}
};
int
main(int argc, char *argv[])
{
char *filename = NULL;
int advice = POSIX_FADV_NORMAL;
int fd, ch;
int err = 0;
while ((ch = getopt(argc, argv, "a:f:")) != EOF) {
switch (ch) {
case 'a':
advice = -1;
for (const advice_name *p = table; p->name; ++p) {
if (strcmp(p->name, optarg) == 0)
advice = p->value;
}
break;
case 'f':
filename = optarg;
break;
case '?':
(void) printf("unknown arg %c\n", optopt);
usage();
break;
}
}
if (!filename) {
(void) printf("Filename not specified (-f <file>)\n");
err++;
}
if (advice == -1) {
(void) printf("advice is invalid\n");
err++;
}
if (err) {
usage(); /* no return */
return (1);
}
if ((fd = open(filename, O_RDWR, 0666)) < 0) {
perror("open");
return (1);
}
if (posix_fadvise(fd, 0, 0, advice) != 0) {
perror("posix_fadvise");
close(fd);
return (1);
}
close(fd);
return (0);
}
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