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Date: Wed, 27 May 2020 19:31:38 +0300
From: Alexander Scherbatiy <alexander.scherbatiy@...l-sw.com>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com
Subject: Re: musl libc version
On 27.05.2020 18:57, Rich Felker wrote:
> On Wed, May 27, 2020 at 06:44:38PM +0300, Alexander Scherbatiy wrote:
>> Hello,
>>
>> Using glibc it is possible to get GNU C library version using
>> confstr() function and _CS_GNU_LIBC_VERSION constant.
>>
>> In musl the confstr() returns EINVAL for _CS_GNU_LIBC_VERSION.
>> Is there a way to get libc version in musl?
> Can you describe what you're trying to achieve with a version number?
It is used mostly for logging purposes.
For example the JVM crash dump [1] prints libc version as "unknown
unknown".
This is because the confstr is used in os_linux.cpp [2]
It would be nice to know from a crash dump was JDK linked with glibc
or musl in Alpine Linux and which version of musl has been used.
[1] https://bugs.openjdk.java.net/secure/attachment/87289/hs_err_pid5502.log
[2]
https://hg.openjdk.java.net/portola/portola/file/7ff60204a181/src/hotspot/os/linux/os_linux.cpp#l607
Thanks,
Alexander.
> musl specifically doesn't publish version numbers via macros or
> runtime interfaces because they're a poor proxy for checking for the
> particular feature/property/whatever you care about. For instance,
> distros may backport the thing you want to an older version, and even
> if not, you end up hard-coding knowledge about particular libcs that
> quickly bitrots rather than making something robust and future-proof.
>
> With that said, ability to test for some things is presently
> inadequate, and there's a proposal I've made (based on previous
> discussions with others) on libc-coord to improve this in a cross-libc
> manner:
>
> https://www.openwall.com/lists/libc-coord/2020/04/22/1
>
> If you have input into what kinds of things you need to be able to
> test for it would be very helpful.
>
> Rich
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