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642e1c69 MY |
1 | /* |
2 | * fadvise - utility to use the posix_fadvise(2) | |
3 | * | |
4 | * Copyright (C) 2022 Red Hat, Inc. All rights reserved. | |
5 | * Written by Masatake YAMATO <yamato@redhat.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it would be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along | |
18 | * with this program; if not, write to the Free Software Foundation, Inc., | |
19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
20 | */ | |
21 | ||
22 | #include <fcntl.h> | |
23 | #include <getopt.h> | |
24 | #include <stdbool.h> | |
25 | #include <stdio.h> | |
26 | ||
27 | #include "c.h" | |
28 | #include "nls.h" | |
29 | #include "strutils.h" | |
30 | ||
31 | static const struct advice { | |
32 | const char *name; | |
33 | int num; | |
34 | } advices [] = { | |
35 | { "normal", POSIX_FADV_NORMAL, }, | |
36 | { "sequential", POSIX_FADV_SEQUENTIAL, }, | |
37 | { "random", POSIX_FADV_RANDOM, }, | |
38 | { "noreuse", POSIX_FADV_NOREUSE, }, | |
39 | { "willneeded", POSIX_FADV_WILLNEED, }, | |
40 | { "dontneed", POSIX_FADV_DONTNEED, }, | |
41 | }; | |
42 | ||
43 | static void __attribute__((__noreturn__)) usage(void) | |
44 | { | |
45 | FILE *out = stdout; | |
46 | size_t i; | |
47 | ||
48 | fputs(USAGE_HEADER, out); | |
49 | fprintf(out, _(" %s [options] file\n"), program_invocation_short_name); | |
50 | fprintf(out, _(" %s [options] --fd|-d file-descriptor\n"), program_invocation_short_name); | |
51 | ||
52 | fputs(USAGE_OPTIONS, out); | |
53 | fputs(_(" -a, --advice <advice> applying advice to the file (default: \"dontneed\")\n"), out); | |
54 | fputs(_(" -l, --length <num> length for range operations, in bytes\n"), out); | |
55 | fputs(_(" -o, --offset <num> offset for range operations, in bytes\n"), out); | |
56 | ||
57 | fputs(USAGE_SEPARATOR, out); | |
bad4c729 | 58 | fprintf(out, USAGE_HELP_OPTIONS(23)); |
642e1c69 MY |
59 | |
60 | fputs(_("\nAvailable values for advice:\n"), out); | |
61 | for (i = 0; i < ARRAY_SIZE(advices); i++) { | |
62 | fprintf(out, " %s\n", | |
63 | advices[i].name); | |
64 | } | |
65 | ||
bad4c729 | 66 | fprintf(out, USAGE_MAN_TAIL("fadvise(1)")); |
642e1c69 MY |
67 | |
68 | exit(EXIT_SUCCESS); | |
69 | } | |
70 | ||
642e1c69 MY |
71 | int main(int argc, char ** argv) |
72 | { | |
73 | int c; | |
74 | int rc; | |
75 | bool do_close = false; | |
76 | ||
77 | int fd = -1; | |
78 | off_t offset = 0; | |
79 | off_t len = 0; | |
80 | int advice = POSIX_FADV_DONTNEED; | |
81 | ||
82 | static const struct option longopts[] = { | |
83 | { "advice", required_argument, NULL, 'a' }, | |
84 | { "fd", required_argument, NULL, 'd' }, | |
85 | { "length", required_argument, NULL, 'l' }, | |
86 | { "offset", required_argument, NULL, 'o' }, | |
87 | { "version", no_argument, NULL, 'V' }, | |
88 | { "help", no_argument, NULL, 'h' }, | |
89 | { NULL, 0, NULL, 0 }, | |
90 | }; | |
91 | ||
92 | setlocale(LC_ALL, ""); | |
93 | bindtextdomain(PACKAGE, LOCALEDIR); | |
94 | textdomain(PACKAGE); | |
95 | ||
bb78a177 | 96 | while ((c = getopt_long (argc, argv, "a:d:hl:o:V", longopts, NULL)) != -1) { |
642e1c69 MY |
97 | switch (c) { |
98 | case 'a': | |
ccabb1ec TW |
99 | advice = -1; |
100 | for (size_t i = 0; i < ARRAY_SIZE(advices); i++) { | |
101 | if (strcmp(optarg, advices[i].name) == 0) { | |
102 | advice = advices[i].num; | |
103 | break; | |
104 | } | |
105 | } | |
106 | if (advice == -1) | |
107 | errx(EXIT_FAILURE, "invalid advice argument: '%s'", optarg); | |
642e1c69 MY |
108 | break; |
109 | case 'd': | |
110 | fd = strtos32_or_err(optarg, | |
111 | _("invalid fd argument")); | |
112 | break; | |
113 | case 'l': | |
114 | len = strtosize_or_err(optarg, | |
115 | _("invalid length argument")); | |
116 | break; | |
117 | case 'o': | |
118 | offset = strtosize_or_err(optarg, | |
119 | _("invalid offset argument")); | |
120 | break; | |
121 | case 'V': | |
122 | print_version(EXIT_SUCCESS); | |
123 | case 'h': | |
124 | usage(); | |
125 | default: | |
126 | errtryhelp(EXIT_FAILURE); | |
127 | } | |
128 | } | |
129 | ||
130 | if (optind == argc && fd == -1) { | |
131 | warnx(_("no file specified")); | |
132 | errtryhelp(EXIT_FAILURE); | |
133 | } | |
134 | ||
135 | if (argc - optind > 0 && fd != -1) { | |
136 | warnx(_("specify either file descriptor or file name")); | |
137 | errtryhelp(EXIT_FAILURE); | |
138 | } | |
139 | ||
140 | if (argc - optind > 1) { | |
141 | warnx(_("specify one file descriptor or file name")); | |
142 | errtryhelp(EXIT_FAILURE); | |
143 | } | |
144 | ||
145 | if (fd == -1) { | |
146 | fd = open(argv[optind], O_RDONLY); | |
147 | if (fd < 0) | |
148 | err(EXIT_FAILURE, _("cannot open %s"), argv[optind]); | |
149 | do_close = true; | |
150 | } | |
151 | ||
152 | rc = posix_fadvise(fd, | |
153 | offset, len, | |
154 | advice); | |
155 | if (rc != 0) | |
8ea8d557 | 156 | warnx(_("failed to advise: %s"), strerror(rc)); |
642e1c69 MY |
157 | |
158 | if (do_close) | |
159 | close(fd); | |
160 | ||
3179b40c | 161 | return rc == 0 ? EXIT_SUCCESS : EXIT_FAILURE; |
642e1c69 | 162 | } |