Name
_llseek — reposition read/write file offset
Synopsis
#include <sys/syscall.h> /* Definition of SYS_* constants */ #include <unistd.h>
int
syscall( |
SYS__llseek, |
| unsigned int fd, | |
| unsigned long offset_high, | |
| unsigned long offset_low, | |
| loff_t *result, | |
unsigned int whence); |
![[Note]](../stylesheet/note.png) |
Note |
|---|---|
| glibc provides no wrapper for |
.BR _llseek (), necessitating the use of
DESCRIPTION
|
|
Note |
|---|---|
|
For information about the llseek(3) library function, see lseek64(3). |
The _llseek() system call
repositions the offset of the open file description
associated with the file descriptor fd to the value
-
(offset_high << 32) | offset_low
This new offset is a byte offset 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.
The new file offset is returned in the argument result. The type loff_t is a 64-bit signed type.
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
-
fdis not an open file descriptor. - EFAULT
-
Problem with copying results to user space.
- EINVAL
-
whenceis invalid.
CONFORMING TO
This function is Linux-specific, and should not be used in programs intended to be portable.
COLOPHON
This page is part of release 5.13 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/.
|
Copyright (C) 1995 Andries Brouwer (aebcwi.nl) Written 10 June 1995 by Andries Brouwer <aebcwi.nl> and Copyright (C) 2007, 2015, 2020, Michael Kerrisk <mtk.manpagesgmail.com> %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. %%%LICENSE_END Modified Thu Oct 31 15:16:23 1996 by Eric S. Raymond <esrthyrsus.com> |