off_t, off64_t, loff_t − file sizes
Standard C library (libc)
#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;
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.
|
off_t |
POSIX.1-2008. |
off64_t
GNU and some BSDs.
|
loff_t |
Linux. |
|
off_t |
POSIX.1-2001. |
<aio.h> and <stdio.h> define off_t since POSIX.1-2008.
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>.
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)