Date: Mon, 28 Jun 2010 22:20:03 GMT From: Garrett Cooper <gcooper@FreeBSD.org> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/144307: ENOENT set unnecessarily under certain circumstances when malloc is called / fails Message-ID: <201006282220.o5SMK3E5066344@freefall.freebsd.org>
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The following reply was made to PR kern/144307; it has been noted by GNATS. From: Garrett Cooper <gcooper@FreeBSD.org> To: Jaakko Heinonen <jh@freebsd.org> Cc: bug-followup@freebsd.org Subject: Re: kern/144307: ENOENT set unnecessarily under certain circumstances when malloc is called / fails Date: Mon, 28 Jun 2010 15:17:32 -0700 On Mon, Jun 28, 2010 at 1:10 PM, Jaakko Heinonen <jh@freebsd.org> wrote: > On 2010-06-28, Garrett Cooper wrote: >> =A0 =A0 Or the malloc(3) call could be fixed with the couple of lines I >> noted (well, adlibbed of course... >> >> =A0 =A0 Which I agree with, but shouldn't we fix malloc(3) (and any othe= r >> function calls that depend on malloc(3) for sensible results)? > > It's not required for POSIX compliance at least. Did you actually read > the quotes from POSIX? > > "The value of errno should only be examined when it is indicated to be > valid by a function's return value." > > "The setting of errno after a successful call to a function is > unspecified unless the description of that function specifies that errno > shall not be modified." > > In other words the value of errno is undefined and shouldn't be > examined unless malloc(3) returns NULL. Ok. The bsdlabel(8) item is valid, but in the meantime I'll write some testcases for read(2) to see whether or not I can find the recreate the failing condition when =3D=3D -1. Worst case we'll have more testcases to put in the tree... Thanks! -Garrett
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