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#ifndef ISTREAM_TRY_H #define ISTREAM_TRY_H /* Read from the first input stream that doesn't fail with EINVAL. If any of the streams fail with non-EINVAL, it's treated as a fatal failure and the error is immediately returned. If a stream returns 0, more data is waited for before continuing to the next stream. This allows the last stream to be a fallback stream that always succeeds. Once the stream is detected, all the other streams are unreferenced. The streams should usually be children of the same parent tee-istream. Detecting whether istream-tee buffer is full or not is a bit tricky. There's no visible difference between non-blocking istream returning 0 and istream-tee buffer being full. To work around this, we treat used buffer sizes <= min_buffer_full_size as being non-blocking istreams, while buffer sizes > min_buffer_full_size are assumed to be due to istream-tee max buffer size being reached. Practically this means that min_buffer_full_size must be smaller than the smallest of the istreams' maximum buffer sizes, but large enough that all the istreams would have returned EINVAL on invalid input by that position. */ struct istream *istream_try_create(struct istream *const input[], size_t min_buffer_full_size); #endif