• Jens Axboe's avatar
    io_uring: allow use of offset == -1 to mean file position · ba04291e
    Jens Axboe authored
    This behaves like preadv2/pwritev2 with offset == -1, it'll use (and
    update) the current file position. This obviously comes with the caveat
    that if the application has multiple read/writes in flight, then the
    end result will not be as expected. This is similar to threads sharing
    a file descriptor and doing IO using the current file position.
    
    Since this feature isn't easily detectable by doing a read or write,
    add a feature flags, IORING_FEAT_RW_CUR_POS, to allow applications to
    detect presence of this feature.
    Reported-by: default avatar李通洲 <carter.li@eoitek.com>
    Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
    ba04291e
io_uring.c 148 KB