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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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