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From: "mtk.manpages at gmail dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug math/6807] y0(), y1(), yn() do not raise exception and give
 wrong errno for pole error
Date: Tue, 26 May 2020 10:26:01 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D6807

--- Comment #9 from Michael Kerrisk <mtk.manpages at gmail dot com> ---
y0(3) manual page has been patched to note the fix.

diff --git a/man3/y0.3 b/man3/y0.3
index 07e20bd78..460a63ad9 100644
--- a/man3/y0.3
+++ b/man3/y0.3
@@ -187,15 +187,11 @@ Pole error: \fIx\fP is 0.0
 .\" as a range error.
 .I errno
 is set to
-.\" FIXME . y0(0.0) gives EDOM
 .BR ERANGE
-(but see BUGS).
-No
+and an
 .B FE_DIVBYZERO
-exception is returned by
-.BR fetestexcept (3)
-for this case.
-.\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=3D6808
+exception is raised
+(but see BUGS).
 .TP
 Range error: result underflow
 .\" e.g., y0(1e33) on glibc 2.8/x86-32
@@ -253,15 +249,18 @@ conform to SVr4, 4.3BSD,
 POSIX.1-2001, POSIX.1-2008.
 The others are nonstandard functions that also exist on the BSDs.
 .SH BUGS
-On a pole error, these functions set
+Before glibc 2.19,
+.\" http://sourceware.org/bugzilla/show_bug.cgi?id=3D6807
+these functions misdiagnosed pole errors:
 .I errno
-to
+was set to
 .BR EDOM ,
 instead of
 .BR ERANGE
+and no
+.B FE_DIVBYZERO
+exception was raised.
 as POSIX.1-2004 requires.
-.\" FIXME .
-.\" Bug raised: http://sourceware.org/bugzilla/show_bug.cgi?id=3D6807
 .PP
 In glibc version 2.3.2 and earlier,
 .\" FIXME . Actually, 2.3.2 is the earliest test result I have; so yet

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