[cs631apue] getbsize(3) error checking

Jan Schaumann jschauma at stevens.edu
Fri Oct 12 21:53:45 EDT 2018

Ramana Nagasamudram <rnagasam at stevens.edu> wrote:
> How should we go about handling any errors from getbsize(3)?  The
> man page says that when BLOCKSIZE isn't reasonable, a warning is
> written to stderr.  Does this mean we don't have to worry about
> writing to stderr when using this function?

Think about what you'd expect for a tool: would you prefer two messages
basically saying the same thing?

In programming, this is known as the Principle of Least Astonishment
(POLA, also: least surprise).  Do what the user would expect.

Since you have a handy reference implementation, you can also compare
what that tool does.  Set BLOCKSIZE to something non-sensical and see
how that tool reports the error.


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