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/* Connect implementation
Copyright (C) 2014-2023 Free Software Foundation, Inc.
This file is part of GCC.
GCC 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, or (at your option) any later
version.
GCC 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 GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include <cc1plugin-config.h>
#include <string>
#include <unistd.h>
#include <sys/types.h>
#include <string.h>
#include <errno.h>
#include "marshall.hh"
#include "connection.hh"
#include "rpc.hh"
cc1_plugin::status
cc1_plugin::connection::send (char c)
{
if (write (m_fd, &c, 1) != 1)
return FAIL;
return OK;
}
cc1_plugin::status
cc1_plugin::connection::send (const void *buf, int len)
{
if (write (m_fd, buf, len) != len)
return FAIL;
return OK;
}
cc1_plugin::status
cc1_plugin::connection::require (char c)
{
char result;
if (read (m_fd, &result, 1) != 1
|| result != c)
return FAIL;
return OK;
}
cc1_plugin::status
cc1_plugin::connection::get (void *buf, int len)
{
if (read (m_fd, buf, len) != len)
return FAIL;
return OK;
}
cc1_plugin::status
cc1_plugin::connection::do_wait (bool want_result)
{
while (true)
{
char result;
fd_set read_set;
FD_ZERO (&read_set);
FD_SET (m_fd, &read_set);
if (m_aux_fd != -1)
FD_SET (m_aux_fd, &read_set);
int nfds = select (FD_SETSIZE, &read_set, NULL, NULL, NULL);
if (nfds == -1)
{
if (errno == EINTR)
continue;
return FAIL;
}
// We have to check the stderr fd first, to avoid a possible
// blocking scenario when do_wait is called reentrantly. In
// such a call, if we handle the primary fd first, then we may
// re-enter this function, read from gcc's stderr, causing the
// outer invocation of this function to block when trying to
// read.
if (m_aux_fd != -1 && FD_ISSET (m_aux_fd, &read_set))
{
char buf[1024];
int n = read (m_aux_fd, buf, sizeof (buf) - 1);
if (n < 0)
return FAIL;
if (n > 0)
{
buf[n] = '\0';
print (buf);
}
}
if (FD_ISSET (m_fd, &read_set))
{
int n = read (m_fd, &result, 1);
if (n == 0)
return want_result ? FAIL : OK;
if (n != 1)
return FAIL;
switch (result)
{
case 'R':
// The reply is ready; the caller will unmarshall it.
return want_result ? OK : FAIL;
case 'Q':
// While waiting for a reply, the other side made a method
// call.
{
// Use an argument_wrapper here to simplify management
// of the string's lifetime.
argument_wrapper<char *> method_name;
if (!method_name.unmarshall (this))
return FAIL;
callback_ftype *callback
= m_callbacks.find_callback (method_name.get ());
// The call to CALLBACK is where we may end up in a
// reentrant call.
if (callback == NULL || !callback (this))
return FAIL;
}
break;
default:
return FAIL;
}
}
}
}
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