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.
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 4.10 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/.