func _io_seek(fd: Int, offset: Int, whence: Int) 'io -> IntMove a descriptor's file offset (POSIX lseek): the new absolute offset or a negative errno. whence is SEEKSET, SEEKCUR, or SEEK_END.
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pub func _io_seek(fd: Int, offset: Int, whence: Int) 'io -> Int {
'io(request: .seek(fd, offset, whence))
}