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Re: [PATCH] gdb/inflow.c: Move SIGTTOU temporary ignoring to a RAII class
- From: Simon Marchi <simark at simark dot ca>
- To: gdb-patches at sourceware dot org,Pedro Alves <palves at redhat dot com>
- Date: Fri, 10 Nov 2017 11:24:48 -0500
- Subject: Re: [PATCH] gdb/inflow.c: Move SIGTTOU temporary ignoring to a RAII class
- Authentication-results: sourceware.org; auth=none
- References: <1510272244-4980-1-git-send-email-palves@redhat.com>
On 9 November 2017 19:04:04 GMT-05:00, Pedro Alves <palves@redhat.com> wrote:
>I expect to use this more places (in inflow.c) in follow up patches,
>but I think this is still good on its own.
>
>gdb/ChangeLog:
>yyyy-mm-dd Pedro Alves <palves@redhat.com>
>
> * inflow.c (scoped_ignore_sigttou): New class.
> (child_terminal_ours_1, new_tty): Use it.
>---
> gdb/inflow.c | 50 +++++++++++++++++++++++++++++++++-----------------
> 1 file changed, 33 insertions(+), 17 deletions(-)
>
>diff --git a/gdb/inflow.c b/gdb/inflow.c
>index 2fba0fa..52be5af 100644
>--- a/gdb/inflow.c
>+++ b/gdb/inflow.c
>@@ -91,6 +91,35 @@ static serial_ttystate initial_gdb_ttystate;
>
>static struct terminal_info *get_inflow_inferior_data (struct inferior
>*);
>
>+/* RAII class used to ignore SIGTTOU in a scope. */
>+
>+class scoped_ignore_sigttou
>+{
>+public:
>+ scoped_ignore_sigttou ()
>+ {
>+#ifdef SIGTTOU
>+ if (job_control)
>+ m_osigttou = signal (SIGTTOU, SIG_IGN);
>+#endif
>+ }
>+
>+ ~scoped_ignore_sigttou ()
>+ {
>+#ifdef SIGTTOU
>+ if (job_control)
>+ signal (SIGTTOU, m_osigttou);
>+#endif
>+ }
>+
>+ DISABLE_COPY_AND_ASSIGN (scoped_ignore_sigttou);
>+
>+private:
>+#ifdef SIGTTOU
>+ sighandler_t m_osigttou = NULL;
>+#endif
>+};
>+
> #ifdef HAVE_TERMIOS_H
>
> /* Return the process group of the current inferior. */
>@@ -329,17 +358,11 @@ child_terminal_ours_1 (int output_only)
> return;
> else
> {
>-#ifdef SIGTTOU
>- /* Ignore this signal since it will happen when we try to set
>the
>- pgrp. */
>- sighandler_t osigttou = NULL;
>-#endif
> int result ATTRIBUTE_UNUSED;
>
>-#ifdef SIGTTOU
>- if (job_control)
>- osigttou = signal (SIGTTOU, SIG_IGN);
>-#endif
>+ /* Ignore SIGTTOU since it will happen when we try to set the
>+ terminal's pgrp. */
>+ scoped_ignore_sigttou ignore_sigttou;
>
> xfree (tinfo->ttystate);
> tinfo->ttystate = serial_get_tty_state (stdin_serial);
>@@ -372,11 +395,6 @@ child_terminal_ours_1 (int output_only)
> #endif /* termios */
> }
>
>-#ifdef SIGTTOU
>- if (job_control)
>- signal (SIGTTOU, osigttou);
>-#endif
>-
> if (!job_control)
> {
> signal (SIGINT, sigint_ours);
>@@ -603,12 +621,10 @@ new_tty (void)
> tty = open ("/dev/tty", O_RDWR);
> if (tty > 0)
> {
>- sighandler_t osigttou;
>+ scoped_ignore_sigttou ignore_sigttou;
>
>- osigttou = signal (SIGTTOU, SIG_IGN);
> ioctl (tty, TIOCNOTTY, 0);
> close (tty);
>- signal (SIGTTOU, osigttou);
> }
> #endif
>
LGTM (at least on my phone :))
Simon