Default input and output buffering for fopen'd files?
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by Evan Teran
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Published on 2010-04-19T18:46:20Z
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2010/04/19
19:03 UTC
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So a FILE stream can have both input and output buffers. You can adjust the output stream using setvbuf (I am unaware of any method to play with the input buffer size and behavior).
Also, by default the buffer is BUFSIZ (not sure if this is a POSIX or C thing). It is very clear what this means for stdin/stdout/stderr, but what are the defaults for newly opened files? Are they buffered for both input and output? Or perhaps just one?
If it is buffered, does output default to block or line mode?
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