Restrict the preview1 implementation of fd_read to one iovec #8415
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I was initially confused reading over this trying to piece together how this wasn't covered by #8353 but that was Mind adding a test for this? Also, can you update the filter here to be the same as #8353 where it searches for the first non-empty buffer rather than the first buffer? |
…8277 Co-authored-by: Nick Fitzgerald <fitzgen@gmail.com>
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I added a test, and verified that it failed without the fix to |
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…ealliance#8415) * We can only have one mutable borrow at a time after bytecodealliance#8277 Co-authored-by: Nick Fitzgerald <fitzgen@gmail.com> * Add a test like pread/pwrite, but for read/write --------- Co-authored-by: Nick Fitzgerald <fitzgen@gmail.com>
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In the wasi-common implementation of
fd_readfor preview1, switch to only reading the first iovec given in a vectored read. This avoids issues with Wiggle's runtime borrow-checker implemented in #8277, which would cause the reads to unconditionally fail when two mutable borrows were taken out on the same memory.While it's not as efficient to perform a single read at a time, it is also valid, as read never promises to read all of the vectors provided.
Co-authored-by: Nick Fitzgerald fitzgen@gmail.com