mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-21 01:12:32 +08:00
1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
122 lines
3.1 KiB
C++
122 lines
3.1 KiB
C++
/* Support for ignoring signals.
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Copyright (C) 2021-2024 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef SCOPED_IGNORE_SIGNAL_H
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#define SCOPED_IGNORE_SIGNAL_H
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#include <signal.h>
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/* RAII class used to ignore a signal in a scope. If sigprocmask is
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supported, then the signal is only ignored by the calling thread.
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Otherwise, the signal disposition is set to SIG_IGN, which affects
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the whole process. If ConsumePending is true, the destructor
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consumes a pending Sig. SIGPIPE for example is queued on the
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thread even if blocked at the time the pipe is written to. SIGTTOU
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OTOH is not raised at all if the thread writing to the terminal has
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it blocked. Because SIGTTOU is sent to the whole process instead
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of to a specific thread, consuming a pending SIGTTOU in the
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destructor could consume a signal raised due to actions done by
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some other thread. */
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template <int Sig, bool ConsumePending>
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class scoped_ignore_signal
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{
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public:
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scoped_ignore_signal ()
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{
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#ifdef HAVE_SIGPROCMASK
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sigset_t set, old_state;
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sigemptyset (&set);
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sigaddset (&set, Sig);
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sigprocmask (SIG_BLOCK, &set, &old_state);
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m_was_blocked = sigismember (&old_state, Sig);
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#else
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m_osig = signal (Sig, SIG_IGN);
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#endif
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}
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~scoped_ignore_signal ()
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{
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#ifdef HAVE_SIGPROCMASK
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if (!m_was_blocked)
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{
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sigset_t set;
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sigemptyset (&set);
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sigaddset (&set, Sig);
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/* If we got a pending Sig signal, consume it before
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unblocking. */
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if (ConsumePending)
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{
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#ifdef HAVE_SIGTIMEDWAIT
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const timespec zero_timeout = {};
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sigtimedwait (&set, nullptr, &zero_timeout);
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#else
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sigset_t pending;
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sigpending (&pending);
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if (sigismember (&pending, Sig))
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{
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int sig_found;
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sigwait (&set, &sig_found);
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gdb_assert (sig_found == Sig);
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}
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#endif
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}
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sigprocmask (SIG_UNBLOCK, &set, nullptr);
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}
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#else
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signal (Sig, m_osig);
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#endif
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}
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DISABLE_COPY_AND_ASSIGN (scoped_ignore_signal);
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private:
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#ifdef HAVE_SIGPROCMASK
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bool m_was_blocked;
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#else
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sighandler_t m_osig;
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#endif
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};
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struct scoped_ignore_signal_nop
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{
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/* Note, these can't both be "= default", because otherwise the
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compiler warns that variables of this type are not used. */
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scoped_ignore_signal_nop ()
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{}
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~scoped_ignore_signal_nop ()
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{}
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DISABLE_COPY_AND_ASSIGN (scoped_ignore_signal_nop);
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};
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#ifdef SIGPIPE
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using scoped_ignore_sigpipe = scoped_ignore_signal<SIGPIPE, true>;
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#else
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using scoped_ignore_sigpipe = scoped_ignore_signal_nop;
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#endif
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#endif /* SCOPED_IGNORE_SIGNAL_H */
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