_llseek - reposition read/write file offset
#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.
The
_llseek() system call 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.
Upon successful completion,
_llseek() returns 0. Otherwise, a value of -1
is returned and
errno is set to indicate the error.
- 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.
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.
lseek(2),
open(2),
lseek64(3)