off_t
Section: Misc. Reference Manual Pages (3type)
Updated: 2022-10-30
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NAME
off_t, off64_t, loff_t - file sizes
LIBRARY
Standard C library
(libc)
SYNOPSIS
#include <sys/types.h>
typedef /* ... */ off_t;
#define _LARGEFILE64_SOURCE
#include <sys/types.h>
typedef /* ... */ off64_t;
#define _GNU_SOURCE
#include <sys/types.h>
typedef /* ... */ loff_t;
DESCRIPTION
off_t
is used for describing file sizes.
It is a signed integer type.
off64_t
is a 64-bit version of the type,
used in glibc.
loff_t
is a 64-bit version of the type,
introduced by the Linux kernel.
VERSIONS
<aio.h>
and
<stdio.h>
define
off_t
since POSIX.1-2008.
STANDARDS
off_t:
POSIX.1-2001 and later.
off64_t:
Present in glibc and some BSDs.
loff_t:
Linux-specific.
NOTES
On some architectures,
the width of
off_t
can be controlled with the feature test macro
_FILE_OFFSET_BITS.
The following headers also provide
off_t:
<aio.h>,
<fcntl.h>,
<stdio.h>,
<sys/mman.h>,
<sys/stat.h>,
and
<unistd.h>.
SEE ALSO
copy_file_range(2),
llseek(2),
lseek(2),
mmap(2),
posix_fadvise(2),
pread(2),
readahead(2),
sync_file_range(2),
truncate(2),
fseeko(3),
lockf(3),
lseek64(3),
posix_fallocate(3),
feature_test_macros(7)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- VERSIONS
-
- STANDARDS
-
- NOTES
-
- SEE ALSO
-
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