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0, if no error occurs.

Notes/Warnings

1. fs_setvbuf() must be used after a stream is opened but before any other operation is performed on stream.
2. sizemust be more than or equal to the size of one sector; it will be rounded DOWN to the nearest size of a multiple of full sectors.
3. Once a buffer is assigned to a file, a new buffer may not be assigned nor may the assigned buffer be removed. To change the buffer, the file should be closed and re-opened.
4. Upon power loss, any data stored in file buffers will be lost.