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Re: determine whether code is running in a signal handler context

From: Florian Weimer <fweimer at redhat dot com>
To: Yubin Ruan <ablacktshirt at gmail dot com>
Cc: libc-help at sourceware dot org, Carlos O'Donell <carlos at redhat dot com>, Will Hawkins <whh8b at virginia dot edu>, spc at conman dot org, noloader at gmail dot com, Szabolcs Nagy <szabolcs dot nagy at arm dot com>
Date: Mon, 27 Nov 2017 13:51:45 +0100
Subject: Re: determine whether code is running in a signal handler context
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References: <CAJYFCiPkMNCr0X61AQ9MqhXyagOb0k4tTp5mRAD171VLkedVYQ@mail.gmail.com> <CAJYFCiOOhQz1XurSEFe08f7V4cyVFED24_5QmVtYqhu0TTWk4g@mail.gmail.com> <2606c307-a853-1fff-07a1-7f775f61d2b5@redhat.com> <CAJYFCiMevbGKdJAkMoen8xq=gBZfbMmc5m-WsVtw=WsS97ORyA@mail.gmail.com>

On 11/27/2017 01:50 PM, Yubin Ruan wrote:

2017-11-27 19:55 GMT+08:00 Florian Weimer <fweimer@redhat.com>:

On 11/27/2017 09:42 AM, Yubin Ruan wrote:


Still remember this thread? It turn out that determining whether or not
you
are currently in a signal handler is trivial with libunwind:



This is incorrect.  libunwind (or any other unwinder) relies on information
which is not always available.


what information?


Unwind tables.  A correct stack pointer or frame pointer.

Florian

Follow-Ups:
- Re: determine whether code is running in a signal handler context
  - From: Adhemerval Zanella

References:
- Re: determine whether code is running in a signal handler context
  - From: Yubin Ruan
- Re: determine whether code is running in a signal handler context
  - From: Florian Weimer
- Re: determine whether code is running in a signal handler context
  - From: Yubin Ruan

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