| /* Connect implementation |
| Copyright (C) 2014-2021 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::connection::~connection () |
| { |
| } |
| |
| void |
| cc1_plugin::connection::print (const char *) |
| { |
| } |
| |
| 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); |
| // 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; |
| } |
| } |
| } |
| } |