llseek man page

_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

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Referenced By

lseek64(3), syscalls(2).

_llseek(2) is an alias of llseek(2).

2016-03-15 Linux Linux Programmer's Manual