ISO C and errno

[Ulrich Drepper]

Mark Kettenis <kettenis@wins.uva.nl> writes:

> Only ISO C functions that are documented to store an error value in
> errno are required to leave it alone if they return successfully.
> Those functions should save and restore errno if necessary, and AFAIK
> they do so.

The only functions in ISO C which use errno are the math functions and
strto*().  They do the right thing.

I don't know why you continue hitting on this.  Wrong code cannot be
expected to run.  It only means that writing compatible applications
is harder since you don't see some bugs.

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