_llseek

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



NAME
       _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
       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  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
       This page is part of release 5.10 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/.




Linux                              2020-12-21                          LLSEEK(2)