llseek() System Call in Linux

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);

DESCRIPTION

The _llseek() function repositions the offset of the open file associated with the file descriptor fd to (offset_high<<32) | offset_low bytes relative to the beginning of the file, the current position in the file, 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.

RETURN VALUE

Upon successful completion, _llseek() returns 0. Otherwise, a value of -1 is returned and errno is set to indicate the error.

ERRORS

Tag	Description
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; call it using syscall(2).