Date: Tue, 22 Sep 2020 16:33:43 -0400 From: Jeffrey Walton <noloader@...il.com> To: musl@...ts.openwall.com Subject: Re: Re: OS detection wrong on Alpine Linux 3.10 On Tue, Sep 22, 2020 at 4:18 PM Bruno Haible <bruno@...sp.org> wrote: > ... > > It's true that implementations have a number of things that are > > implementation defined, and that the standards specify this as having > > a documented behavior (which the party reading the documentation can > > then rely upon). At present musl does not have sufficient > > documentation in this regard; I began the work of enumerating all the > > impl-defined behaviors at one point with a goal of documenting them > > but it was never completed. > > It is good to attempt to document such things. But I doubt anyone can > ever produce a complete documentation of this kind: > > * For many system calls, when POSIX specifies an errno X for condition A, > and an errno Y for condition B, then if both A and B apply, often > the implementation is free to return errno X or Y. There are many > system calls and many possible combinations of conditions... Not to mention SELinux hijacking error codes and errno so you go chasing the wrong cause of an error... Jeff
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