libcomposefs: do not override errno#307
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cgwalters merged 1 commit intocomposefs:mainfrom Jul 30, 2024
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do not override the errno reported by the write_cb as we might lose useful errors like ENOSPC. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
cgwalters
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Jul 30, 2024
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| if (ctx->write_cb) { | ||
| while (data_len > 0) { | ||
| errno = EIO; |
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Hmm, I guess we need to do this because we can't rely on callers setting errno...and indeed in our own code which uses fwrite, it doesn't?
So...okay, is there really no way to get the actual error out of ferror?
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Oh, I guess fwrite is...somewhat expected conventionally to set errno, but it's not standardized?
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do not override the errno reported by the write_cb as we might lose useful errors like ENOSPC.