102 lines
2 KiB
C++
102 lines
2 KiB
C++
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/* Event pipe for GDB, the GNU debugger.
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Copyright (C) 2021 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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#include "gdbsupport/common-defs.h"
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#include "gdbsupport/event-pipe.h"
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#include "gdbsupport/filestuff.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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event_pipe::~event_pipe ()
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{
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if (is_open ())
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close_pipe ();
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}
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/* See event-pipe.h. */
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bool
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event_pipe::open_pipe ()
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{
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if (is_open ())
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return false;
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if (gdb_pipe_cloexec (m_fds) == -1)
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return false;
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if (fcntl (m_fds[0], F_SETFL, O_NONBLOCK) == -1
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|| fcntl (m_fds[1], F_SETFL, O_NONBLOCK) == -1)
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{
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close_pipe ();
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return false;
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}
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return true;
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}
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/* See event-pipe.h. */
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void
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event_pipe::close_pipe ()
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{
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::close (m_fds[0]);
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::close (m_fds[1]);
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m_fds[0] = -1;
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m_fds[1] = -1;
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}
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/* See event-pipe.h. */
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void
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event_pipe::flush ()
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{
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int ret;
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char buf;
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do
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{
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ret = read (m_fds[0], &buf, 1);
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}
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while (ret >= 0 || (ret == -1 && errno == EINTR));
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}
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/* See event-pipe.h. */
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void
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event_pipe::mark ()
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{
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int ret;
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/* It doesn't really matter what the pipe contains, as long we end
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up with something in it. Might as well flush the previous
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left-overs. */
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flush ();
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do
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{
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ret = write (m_fds[1], "+", 1);
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}
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while (ret == -1 && errno == EINTR);
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/* Ignore EAGAIN. If the pipe is full, the event loop will already
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be awakened anyway. */
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}
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