LLSEEK
Section: Linux Programmer's Manual (2)
Updated: 2017-09-15
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NAME
_llseek - reposition read/write file offset
SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
int _llseek(unsigned int fd, unsigned long offset_high,
unsigned long offset_low, loff_t *result,
unsigned int whence);
Note:
There is no glibc wrapper for this system call; see NOTES.
DESCRIPTION
The
_llseek()
function repositions the offset of the open file description associated
with the file descriptor
fd
to
(offset_high<<32) | offset_low
bytes relative to the beginning of the file, the current file offset,
or the end of the file, depending on whether
whence
is
SEEK_SET,
SEEK_CUR,
or
SEEK_END,
respectively.
It returns the resulting file position in the argument
result.
This system call exists on various 32-bit platforms to support
seeking to large file offsets.
RETURN VALUE
Upon successful completion,
_llseek()
returns 0.
Otherwise, a value of -1 is returned and
errno
is set to indicate the error.
ERRORS
- EBADF
-
fd
is not an open file descriptor.
- EFAULT
-
Problem with copying results to user space.
- EINVAL
-
whence
is invalid.
CONFORMING TO
This function is Linux-specific, and should not be used in programs
intended to be portable.
NOTES
Glibc does not provide a wrapper for this system call.
To invoke it directly, use
syscall(2).
However, you probably want to use the
lseek(2)
wrapper function instead.
SEE ALSO
lseek(2),
open(2),
lseek64(3)
COLOPHON
This page is part of release 4.13 of the Linux
man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
https://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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