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- /* Event pipe for GDB, the GNU debugger.
- Copyright (C) 2021 Free Software Foundation, Inc.
- This file is part of GDB.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- #include "gdbsupport/common-defs.h"
- #include "gdbsupport/event-pipe.h"
- #include "gdbsupport/filestuff.h"
- #include <errno.h>
- #include <fcntl.h>
- #include <unistd.h>
- event_pipe::~event_pipe ()
- {
- if (is_open ())
- close_pipe ();
- }
- /* See event-pipe.h. */
- bool
- event_pipe::open_pipe ()
- {
- if (is_open ())
- return false;
- if (gdb_pipe_cloexec (m_fds) == -1)
- return false;
- if (fcntl (m_fds[0], F_SETFL, O_NONBLOCK) == -1
- || fcntl (m_fds[1], F_SETFL, O_NONBLOCK) == -1)
- {
- close_pipe ();
- return false;
- }
- return true;
- }
- /* See event-pipe.h. */
- void
- event_pipe::close_pipe ()
- {
- ::close (m_fds[0]);
- ::close (m_fds[1]);
- m_fds[0] = -1;
- m_fds[1] = -1;
- }
- /* See event-pipe.h. */
- void
- event_pipe::flush ()
- {
- int ret;
- char buf;
- do
- {
- ret = read (m_fds[0], &buf, 1);
- }
- while (ret >= 0 || (ret == -1 && errno == EINTR));
- }
- /* See event-pipe.h. */
- void
- event_pipe::mark ()
- {
- int ret;
- /* It doesn't really matter what the pipe contains, as long we end
- up with something in it. Might as well flush the previous
- left-overs. */
- flush ();
- do
- {
- ret = write (m_fds[1], "+", 1);
- }
- while (ret == -1 && errno == EINTR);
- /* Ignore EAGAIN. If the pipe is full, the event loop will already
- be awakened anyway. */
- }
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