From: Andrew Burgess <andrew.burgess@embecosm.com>
To: Bernd Edlinger <bernd.edlinger@hotmail.de>
Cc: Tom Tromey <tom@tromey.com>,
"gdb-patches@sourceware.org" <gdb-patches@sourceware.org>
Subject: Re: [PATCH] Fix gdb crash due to SIGPIPE when the compile command fails
Date: Sat, 5 Jun 2021 13:04:53 +0100 [thread overview]
Message-ID: <20210605120453.GR2672@embecosm.com> (raw)
In-Reply-To: <AM8PR10MB470861E21A75983D4DA1CA19E43A9@AM8PR10MB4708.EURPRD10.PROD.OUTLOOK.COM>
* Bernd Edlinger <bernd.edlinger@hotmail.de> [2021-06-05 13:44:03 +0200]:
> On 6/4/21 3:39 PM, Tom Tromey wrote:
> >>>>>> "Bernd" == Bernd Edlinger <bernd.edlinger@hotmail.de> writes:
> >
> > Bernd> I believe it is right to avoid the SIGPIPE before calling the plugin,
> > Bernd> instead of doing that in gcc-trunk, since we don't know which version
> > Bernd> we will be calling, and all versions I tried have failed like this.
> >
> > That seems fine, but I think it would be better to install the handler
> > just when working with the plugin, and then uninstall it afterward, sort
> > of like what class scoped_ignore_sigttou does.
> >
>
> Okay, done, that works for me.
>
> Is this OK?
>
>
> Thanks
> Bernd.
>
> From 3bb3966601a89c18ea2700c3eae4aa4f4e195269 Mon Sep 17 00:00:00 2001
> From: Bernd Edlinger <bernd.edlinger@hotmail.de>
> Date: Wed, 2 Jun 2021 19:21:15 +0200
> Subject: [PATCH] Fix gdb crash due to SIGPIPE when the compile command fails
>
> Due to the SIGPIPE the gdb process is killed here, which is
> not helpful.
>
> 2021-06-02 Bernd Edlinger <bernd.edlinger@hotmail.de>
>
> * compile/compile.c (compile_to_object): Ignore SIGPIPE before calling
> the plugin.
> ---
> gdb/compile/compile.c | 31 +++++++++++++++++++++++++++++++
> 1 file changed, 31 insertions(+)
>
> diff --git a/gdb/compile/compile.c b/gdb/compile/compile.c
> index 8481d14..3431d4c 100644
> --- a/gdb/compile/compile.c
> +++ b/gdb/compile/compile.c
> @@ -633,6 +633,33 @@ struct compile_options
> fputs_filtered (message, gdb_stderr);
> }
>
> +/* RAII class used to ignore SIGPIPE in a scope. */
> +
> +class scoped_ignore_sigpipe
> +{
> +public:
> + scoped_ignore_sigpipe ()
> + {
> +#ifdef SIGPIPE
> + m_osigpipe = signal (SIGPIPE, SIG_IGN);
> +#endif
> + }
> +
> + ~scoped_ignore_sigpipe ()
> + {
> +#ifdef SIGTTOU
SIGPIPE?
Thanks,
Andrew
> + signal (SIGPIPE, m_osigpipe);
> +#endif
> + }
> +
> + DISABLE_COPY_AND_ASSIGN (scoped_ignore_sigpipe);
> +
> +private:
> +#ifdef SIGPIPE
> + sighandler_t m_osigpipe = NULL;
> +#endif
> +};
> +
> /* Process the compilation request. On success it returns the object
> and source file names. On an error condition, error () is
> called. */
> @@ -755,6 +782,10 @@ struct compile_options
> fprintf_unfiltered (gdb_stdlog, "source file produced: %s\n\n",
> fnames.source_file ());
>
> + /* If we don't do this, then GDB simply exits
> + when the compiler dies. */
> + scoped_ignore_sigpipe ignore_sigpipe;
> +
> /* Call the compiler and start the compilation process. */
> compiler->set_source_file (fnames.source_file ());
> ok = compiler->compile (fnames.object_file (), compile_debug);
> --
> 1.9.1
>
next prev parent reply other threads:[~2021-06-05 12:04 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-02 17:31 Bernd Edlinger
2021-06-02 18:21 ` Tom Tromey
2021-06-02 22:19 ` Christian Biesinger
2021-06-03 5:45 ` Bernd Edlinger
2021-06-04 13:39 ` Tom Tromey
2021-06-05 11:44 ` Bernd Edlinger
2021-06-05 12:04 ` Andrew Burgess [this message]
2021-06-05 12:27 ` Bernd Edlinger
2021-06-05 14:04 ` Tom Tromey
2021-06-14 11:41 ` Rainer Orth
2021-06-14 12:57 ` Bernd Edlinger
2021-06-14 12:59 ` Rainer Orth
2021-06-14 14:36 ` Bernd Edlinger
2021-06-14 14:39 ` Rainer Orth
2021-06-14 15:07 ` Tom Tromey
2021-06-15 11:10 ` Rainer Orth
2021-06-14 15:04 ` Tom Tromey
2021-06-14 23:35 ` Pedro Alves
2021-06-15 5:14 ` Bernd Edlinger
2021-06-15 11:16 ` Pedro Alves
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