1off_t(3type) off_t(3type)
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6 off_t, off64_t, loff_t - file sizes
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9 Standard C library (libc)
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12 #include <sys/types.h>
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14 typedef /* ... */ off_t;
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16 #define _LARGEFILE64_SOURCE
17 #include <sys/types.h>
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19 typedef /* ... */ off64_t;
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21 #define _GNU_SOURCE
22 #include <sys/types.h>
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24 typedef /* ... */ loff_t;
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27 off_t is used for describing file sizes. It is a signed integer type.
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29 off64_t is a 64-bit version of the type, used in glibc.
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31 loff_t is a 64-bit version of the type, introduced by the Linux kernel.
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34 off_t POSIX.1-2008.
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36 off64_t
37 GNU and some BSDs.
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39 loff_t Linux.
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42 off_t POSIX.1-2001.
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44 <aio.h> and <stdio.h> define off_t since POSIX.1-2008.
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47 On some architectures, the width of off_t can be controlled with the
48 feature test macro _FILE_OFFSET_BITS.
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50 The following headers also provide off_t: <aio.h>, <fcntl.h>,
51 <stdio.h>, <sys/mman.h>, <sys/stat.h>, and <unistd.h>.
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54 copy_file_range(2), llseek(2), lseek(2), mmap(2), posix_fadvise(2),
55 pread(2), readahead(2), sync_file_range(2), truncate(2), fseeko(3),
56 lockf(3), lseek64(3), posix_fallocate(3), feature_test_macros(7)
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60Linux man-pages 6.04 2023-03-30 off_t(3type)