from small one page howto to huge articles all in one place
 

search text in:





Poll
Which filesystem do you use?






poll results

Last additions:
using iotop to find disk usage hogs

using iotop to find disk usage hogs

words:

887

views:

105054

userrating:

average rating: 1.7 (85 votes) (1=very good 6=terrible)


May 25th. 2007:
Words

486

Views

219415

why adblockers are bad


Workaround and fixes for the current Core Dump Handling vulnerability affected kernels

Workaround and fixes for the current Core Dump Handling vulnerability affected kernels

words:

161

views:

99879

userrating:

average rating: 1.3 (28 votes) (1=very good 6=terrible)


April, 26th. 2006:

Druckversion
You are here: manpages





LSEEK64

Section: Linux Programmer's Manual (3)
Updated: 2017-09-15
Index Return to Main Contents
 

NAME

lseek64 - reposition 64-bit read/write file offset  

SYNOPSIS

#define _LARGEFILE64_SOURCE /* See feature_test_macros(7) */
#include <sys/types.h>
#include <unistd.h>

off64_t lseek64(int fd, off64_t offset, int whence);  

DESCRIPTION

The lseek(2) family of functions reposition the offset of the open file associated with the file descriptor fd to offset bytes relative to the start, current position, or end of the file, when whence has the value SEEK_SET, SEEK_CUR, or SEEK_END, respectively.

For more details, return value, and errors, see lseek(2).

Four interfaces are available: lseek(2), lseek64(), llseek(2), and _llseek(2).  

lseek()

Prototype:

off_t lseek(int fd, off_t offset, int whence);

lseek(2) uses the type off_t. This is a 32-bit signed type on 32-bit architectures, unless one compiles with

#define _FILE_OFFSET_BITS 64

in which case it is a 64-bit signed type.  

lseek64()

Prototype:

off64_t lseek64(int fd, off64_t offset, int whence);

The library routine lseek64() uses a 64-bit type even when off_t is a 32-bit type. Its prototype (and the type off64_t) is available only when one compiles with

#define _LARGEFILE64_SOURCE

The function lseek64() is available since glibc 2.1, and is defined to be an alias for llseek().  

llseek()

Prototype:

loff_t llseek(int fd, loff_t offset, int whence);

The type loff_t is a 64-bit signed type. The library routine llseek() is available in glibc and works without special defines. However, the glibc headers do not provide a prototype. Users should add the above prototype, or something equivalent, to their own source. When users complained about data loss caused by a miscompilation of e2fsck(8), glibc 2.1.3 added the link-time warning

"the `llseek' function may be dangerous; use `lseek64' instead."

This makes this function unusable if one desires a warning-free compilation.  

_llseek()

On 32-bit architectures, this is the system call that is used to implement all of the above functions. The prototype is:

int _llseek(int fd, off_t offset_hi, off_t offset_lo, loff_t *result, int whence);

For more details, see llseek(2).

64-bit systems don't need an _llseek() system call. Instead, they have an lseek(2) system call that supports 64-bit file offsets.  

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
lseek64() Thread safetyMT-Safe
 

SEE ALSO

llseek(2), lseek(2)  

COLOPHON

This page is part of release 4.13 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/.


 

Index

NAME
SYNOPSIS
DESCRIPTION
lseek()
lseek64()
llseek()
_llseek()
ATTRIBUTES
SEE ALSO
COLOPHON


Please read "Why adblockers are bad".



Other free services
toURL.org
Shorten long
URLs to short
links like
http://tourl.org/2
tourl.org
.
Reverse DNS lookup
Find out which hostname(s)
resolve to a
given IP or other hostnames for the server
www.reversednslookup.org
rdf newsfeed | rss newsfeed | Atom newsfeed
- Powered by LeopardCMS - Running on Gentoo -
Copyright 2004-2017 Sascha Nitsch Unternehmensberatung UG(haftungsbeschränkt)
Valid XHTML1.1 : Valid CSS : buttonmaker
- Level Triple-A Conformance to Web Content Accessibility Guidelines 1.0 -
- Copyright and legal notices -
Time to create this page: 3.3 ms