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Message-ID: <5db7df90-7aed-c781-863c-2bf62a43a683@esi.com.au>
Date: Thu, 3 Jul 2025 18:00:40 +1000 (AEST)
From: Damian McGuckin <damianm@....com.au>
To: musl@...ts.openwall.com
Subject: Re: sqrt does not emit errno=EDOM
Hi Paul,
On Thu, 3 Jul 2025, Paul Zimmermann wrote:
> it seems musl does not set errno=EDOM for sqrt(x) when x is negative.
> Here on cfarm27 (Alpine Linux):
>
> $ cat /tmp/e.c
> #include <stdio.h>
> #include <math.h>
> #include <errno.h>
>
> int
> main()
> {
> errno = 0;
> float x = -1.0f;
> float y = sqrtf (x);
> printf ("y=%a errno=%d\n", y, errno);
> }
>
> $ gcc /tmp/e.c -lm
> $ ./a.out
> y=-nan errno=0
>
> Is this a known issue?
I think it is a policy issue:
Errors are reported by raising floating-point status flags ie.
math_errhandling is set to MATH_ERREXCEPT on all platforms (errno
is not set by math functions and on platforms without IEEE 754
exception semantics there is no error reporting).
Later - Damian
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