From: Michael Forney <mforney@mforney.org>
To: musl@lists.openwall.com
Subject: Re: [musl] qemu-user and musl
Date: Thu, 29 Oct 2020 00:37:22 -0700 [thread overview]
Message-ID: <3BLFYULF50JCZ.2CFAX0M3JJP1V@mforney.org> (raw)
In-Reply-To: <20201029031121.GJ534@brightrain.aerifal.cx>
Rich Felker <dalias@libc.org> wrote:
> I think that's okay, and I'm merging the patch now (thanks for
> reminding me!), but I'm not sure if it will work still. The signal
> number used as SIGTIMER is considered an implementation-reserved
> internal signal by musl, and as such it can't be poked at by any of
> the public signal API -- and even if it could be, poking at it would
> break things.
Doesn't qemu's signal translating code solve this problem? As of
[0], it maps target signals starting at 32 to host signal SIGRTMIN
+ sig - 32 (previously, it just swapped __SIGRTMIN and __SIGRTMAX).
So the target libc's reserved signal maps to some free RT signal
on the host, and that's what ends up in the sigev_signo passed to
the host libc.
I wrote a simple test program that used SIGEV_THREAD, and it seemed
to work after applying James' patch.
[0] https://github.com/qemu/qemu/commit/6bc024e713fd35eb5fddbe16acd8dc92d27872a9
prev parent reply other threads:[~2020-10-29 7:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-28 23:50 Michael Forney
2020-10-29 2:24 ` Érico Nogueira
2020-10-29 3:11 ` Rich Felker
2020-10-29 7:37 ` Michael Forney [this message]
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