_llseek(2) — Linux manual page


LLSEEK(2)                 Linux Programmer's Manual                LLSEEK(2)

NAME         top

       _llseek - reposition read/write file offset

SYNOPSIS         top

       #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         top

       The _llseek() system call 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         top

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

ERRORS         top

       EBADF  fd is not an open file descriptor.

       EFAULT Problem with copying results to user space.

       EINVAL whence is invalid.

CONFORMING TO         top

       This function is Linux-specific, and should not be used in programs
       intended to be portable.

NOTES         top

       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         top

       lseek(2), open(2), lseek64(3)

COLOPHON         top

       This page is part of release 5.08 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

Linux                            2017-09-15                        LLSEEK(2)

Pages that refer to this page: syscall(2)syscalls(2)lseek64(3)