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drivers/serial/serial.c: adapt to the iovec-based api #14898

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drivers/serial/serial.c: adapt to the iovec-based api #14898

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Commits on Nov 27, 2024

  1. Update a few comments after the recent readv/writev changes

    @yamt
    yamt committed Nov 27, 2024
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  2. Make readv/writev implementations update struct uio 

    This can simplify partial result handling.
    @yamt
    yamt committed Nov 27, 2024
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  3. rename uio_total_len to uio_resid 

    "total" is a bit confusing after the introduction of uio_advance().
    @yamt
    yamt committed Nov 27, 2024
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  4. add uio_copyfrom/uio_copyto 

    although i'm not quite happy with the "offset" functionality,
it's necessary to simplify the adaptation of some drivers like
drivers/serial/serial.c, which (ab)uses the user-supplied buffer
as a line-buffer.
    @yamt
    yamt committed Nov 27, 2024
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  5. drivers/serial/serial.c: adapt to the iovec-based api 

    This would fix readv/writev issues mentioned in
apache#12674.
(only for this specific driver though. with this approach,
we basically have to fix every single drivers and
filesystems.)

Lightly tested on the serial console, using micropython REPL
on toywasm with esp32s3-devkit:toywasm, which used to be
suffered by the readv issue.
    @yamt
    yamt committed Nov 27, 2024
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