[issue17976] file.write doesn't raise IOError when it should

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Indeed, fwrite() can return expected number of items and set errno. Here is a simple example on C. An output is:

setvbuf 0 0
fwrite 5 0
fwrite 1 28
fwrite 1 28

On writing "\n" fwrite returns 1 and set errno to ENOSPC.

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nosy: +serhiy.storchaka
Added file: http://bugs.python.org/file30259/fullwrite.c

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