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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | STANDARDS | SEE ALSO | COLOPHON |
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_llseek(2) System Calls Manual _llseek(2)
_llseek - reposition read/write file offset
Standard C library (libc, -lc)
#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: glibc provides no wrapper for _llseek(), necessitating the
use of syscall(2).
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.
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.
You probably want to use the lseek(2) wrapper function instead.
Linux.
lseek(2), open(2), lseek64(3)
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2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
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Linux man-pages 6.9.1 2024-05-02 _llseek(2)
Pages that refer to this page: syscall(2), syscalls(2), lseek64(3), off_t(3type)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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