_llseek - reposition read/write file offset
The _llseek() system call repositions the offset of the open file description associated with the file descriptor
(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
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.
fd is not an open file descriptor.
Problem with copying results to user space.
whence is invalid.
This function is Linux-specific, and should not be used in programs intended to be portable.
This page is part of release 4.15 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/.