153 lines
3.9 KiB
C
153 lines
3.9 KiB
C
/*
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* fadvise - utility to use the posix_fadvise(2)
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*
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* Copyright (C) 2022 Red Hat, Inc. All rights reserved.
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* Written by Masatake YAMATO <yamato@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <fcntl.h>
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#include <getopt.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include "c.h"
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#include "nls.h"
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#include "strutils.h"
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static const struct advice {
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const char *name;
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int num;
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} advices [] = {
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{ "normal", POSIX_FADV_NORMAL, },
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{ "sequential", POSIX_FADV_SEQUENTIAL, },
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{ "random", POSIX_FADV_RANDOM, },
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{ "noreuse", POSIX_FADV_NOREUSE, },
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{ "willneeded", POSIX_FADV_WILLNEED, },
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{ "dontneed", POSIX_FADV_DONTNEED, },
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};
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static void __attribute__((__noreturn__)) usage(void)
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{
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FILE *out = stdout;
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size_t i;
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fputs(USAGE_HEADER, out);
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fprintf(out, _(" %s [options] file\n"), program_invocation_short_name);
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fprintf(out, _(" %s [options] --fd|-d file-descriptor\n"), program_invocation_short_name);
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fputs(USAGE_OPTIONS, out);
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fputs(_(" -a, --advice <advice> applying advice to the file (default: \"dontneed\")\n"), out);
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fputs(_(" -l, --length <num> length for range operations, in bytes\n"), out);
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fputs(_(" -o, --offset <num> offset for range operations, in bytes\n"), out);
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fputs(USAGE_SEPARATOR, out);
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printf(USAGE_HELP_OPTIONS(23));
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fputs(_("\nAvailable values for advice:\n"), out);
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for (i = 0; i < ARRAY_SIZE(advices); i++) {
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fprintf(out, " %s\n",
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advices[i].name);
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}
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printf(USAGE_MAN_TAIL("fadvise(1)"));
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exit(EXIT_SUCCESS);
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}
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int main(int argc, char ** argv)
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{
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int c;
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int rc;
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bool do_close = false;
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int fd = -1;
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off_t offset = 0;
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off_t len = 0;
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int advice = POSIX_FADV_DONTNEED;
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static const struct option longopts[] = {
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{ "advice", required_argument, NULL, 'a' },
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{ "fd", required_argument, NULL, 'd' },
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{ "length", required_argument, NULL, 'l' },
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{ "offset", required_argument, NULL, 'o' },
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{ "version", no_argument, NULL, 'V' },
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{ "help", no_argument, NULL, 'h' },
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{ NULL, 0, NULL, 0 },
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};
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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while ((c = getopt_long (argc, argv, "a:d:hl:o:V", longopts, NULL)) != -1) {
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switch (c) {
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case 'a':
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break;
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case 'd':
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fd = strtos32_or_err(optarg,
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_("invalid fd argument"));
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break;
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case 'l':
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len = strtosize_or_err(optarg,
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_("invalid length argument"));
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break;
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case 'o':
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offset = strtosize_or_err(optarg,
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_("invalid offset argument"));
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break;
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case 'V':
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print_version(EXIT_SUCCESS);
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case 'h':
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usage();
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default:
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errtryhelp(EXIT_FAILURE);
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}
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}
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if (optind == argc && fd == -1) {
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warnx(_("no file specified"));
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errtryhelp(EXIT_FAILURE);
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}
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if (argc - optind > 0 && fd != -1) {
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warnx(_("specify either file descriptor or file name"));
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errtryhelp(EXIT_FAILURE);
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}
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if (argc - optind > 1) {
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warnx(_("specify one file descriptor or file name"));
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errtryhelp(EXIT_FAILURE);
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}
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if (fd == -1) {
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fd = open(argv[optind], O_RDONLY);
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if (fd < 0)
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err(EXIT_FAILURE, _("cannot open %s"), argv[optind]);
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do_close = true;
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}
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rc = posix_fadvise(fd,
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offset, len,
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advice);
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if (rc != 0)
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warn(_("failed to advise"));
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if (do_close)
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close(fd);
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return rc;
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}
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