projects / thirdparty / man-pages.git / blame
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|---|---|---|
| cb0f97b2 | 1 | .\" Copyright (c) 2020-2022 by Alejandro Colomar <alx@kernel.org> |
| d3e46cf2 AC |
2 | .\" and Copyright (c) 2020 by Michael Kerrisk <mtk.manpages@gmail.com> |
| 3 | .\" | |
| 4 | .\" SPDX-License-Identifier: Linux-man-pages-copyleft | |
| 5 | .\" | |
| 6 | .\" | |
| 4c1c5274 | 7 | .TH off_t 3type (date) "Linux man-pages (unreleased)" |
| d3e46cf2 AC |
8 | .SH NAME |
| 9 | off_t, off64_t, loff_t \- file sizes | |
| 10 | .SH LIBRARY | |
| 11 | Standard C library | |
| 12 | .RI ( libc ) | |
| 13 | .SH SYNOPSIS | |
| 14 | .nf | |
| 15 | .B #include <sys/types.h> | |
| 16 | .PP | |
| 17 | .BR typedef " /* ... */ " off_t; | |
| 18 | .PP | |
| 19 | .B #define _LARGEFILE64_SOURCE | |
| 20 | .B #include <sys/types.h> | |
| 21 | .PP | |
| 22 | .BR typedef " /* ... */ " off64_t; | |
| 23 | .PP | |
| 24 | .B #define _GNU_SOURCE | |
| 25 | .B #include <sys/types.h> | |
| 26 | .PP | |
| 27 | .BR typedef " /* ... */ " loff_t; | |
| 28 | .fi | |
| 29 | .SH DESCRIPTION | |
| 30 | .I off_t | |
| 31 | is used for describing file sizes. | |
| 2325c425 | 32 | It is a signed integer type. |
| d3e46cf2 AC |
33 | .PP |
| 34 | .I off64_t | |
| 35 | is a 64-bit version of the type, | |
| 36 | used in glibc. | |
| 37 | .PP | |
| 38 | .I loff_t | |
| 39 | is a 64-bit version of the type, | |
| 40 | introduced by the Linux kernel. | |
| 41 | .SH VERSIONS | |
| 42 | .I <aio.h> | |
| 43 | and | |
| 44 | .I <stdio.h> | |
| 45 | define | |
| 46 | .I off_t | |
| 47 | since POSIX.1-2008. | |
| 3113c7f3 | 48 | .SH STANDARDS |
| d3e46cf2 AC |
49 | .PD 0 |
| 50 | .IR off_t : | |
| 51 | POSIX.1-2001 and later. | |
| 52 | .PP | |
| 53 | .IR off64_t : | |
| 54 | Present in glibc and some BSDs. | |
| 55 | .PP | |
| 56 | .IR loff_t : | |
| 57 | Linux-specific. | |
| 58 | .PD | |
| 59 | .SH NOTES | |
| 60 | On some architectures, | |
| 61 | the width of | |
| 62 | .I off_t | |
| 63 | can be controlled with the feature test macro | |
| 64 | .BR _FILE_OFFSET_BITS . | |
| 65 | .PP | |
| 66 | The following headers also provide | |
| 67 | .IR off_t : | |
| 68 | .IR <aio.h> , | |
| 69 | .IR <fcntl.h> , | |
| 70 | .IR <stdio.h> , | |
| 71 | .IR <sys/mman.h> , | |
| 72 | .IR <sys/stat.h> , | |
| 73 | and | |
| 74 | .IR <unistd.h> . | |
| 75 | .SH SEE ALSO | |
| 76 | .BR copy_file_range (2), | |
| 77 | .BR llseek (2), | |
| 78 | .BR lseek (2), | |
| 79 | .BR mmap (2), | |
| 80 | .BR posix_fadvise (2), | |
| 81 | .BR pread (2), | |
| 82 | .BR readahead (2), | |
| 83 | .BR sync_file_range (2), | |
| 84 | .BR truncate (2), | |
| 85 | .BR fseeko (3), | |
| 86 | .BR lockf (3), | |
| 87 | .BR lseek64 (3), | |
| 88 | .BR posix_fallocate (3), | |
| 89 | .BR feature_test_macros (7) |