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POSIX API
6-3-3 CONFIGURING A FILE BUFFER
In order to increase the efficiency of file reads and writes, input/output buffering
capabilities are provided. Without an assigned buffer, reads and writes will be immediately
performed within fs_fread() and fs_fwrite() . Once a buffer has been assigned, data
will always be read from or written to the buffer; device access will only occur once the file
position moves beyond the window represented by the buffer.
fs_setbuf() and fs_setvbuf() assign the buffer to a file. The contents of the buffer can
be flushed to the storage device with fs_fflush() . If a buffer is assigned to a file that was
opened in update (read/write) mode, then a write may only be followed by a read if the
buffer has been flushed (by calling fs_fflush() or a file positioning function). A read may
be followed by a write only if the buffer has been flushed, except when the read
encountered the end-of-file, in which case a write may happen immediately. The buffer is
automatically flushed when the file is closed.
File buffering is particularly important when data is written in small chunks to a medium
with slow write time or limited endurance. An example is NOR flash, or even NAND flash,
where write times are much slower than read times, and the lifetime of device is constrained
by limits on the number of times each block can be erased and programmed.
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