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111
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1 /* Connect implementation
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145
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2 Copyright (C) 2014-2020 Free Software Foundation, Inc.
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111
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include <cc1plugin-config.h>
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21 #include <string>
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22 #include <unistd.h>
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23 #include <sys/types.h>
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24 #include <string.h>
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25 #include <errno.h>
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26 #include "marshall.hh"
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27 #include "connection.hh"
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28 #include "rpc.hh"
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29
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30 cc1_plugin::connection::~connection ()
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31 {
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32 }
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33
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34 void
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35 cc1_plugin::connection::print (const char *)
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36 {
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37 }
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38
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39 cc1_plugin::status
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40 cc1_plugin::connection::send (char c)
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41 {
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42 if (write (m_fd, &c, 1) != 1)
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43 return FAIL;
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44 return OK;
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45 }
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46
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47 cc1_plugin::status
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48 cc1_plugin::connection::send (const void *buf, int len)
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49 {
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50 if (write (m_fd, buf, len) != len)
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51 return FAIL;
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52 return OK;
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53 }
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54
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55 cc1_plugin::status
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56 cc1_plugin::connection::require (char c)
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57 {
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58 char result;
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59
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60 if (read (m_fd, &result, 1) != 1
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61 || result != c)
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62 return FAIL;
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63
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64 return OK;
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65 }
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66
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67 cc1_plugin::status
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68 cc1_plugin::connection::get (void *buf, int len)
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69 {
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70 if (read (m_fd, buf, len) != len)
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71 return FAIL;
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72 return OK;
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73 }
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74
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75 cc1_plugin::status
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76 cc1_plugin::connection::do_wait (bool want_result)
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77 {
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78 while (true)
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79 {
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80 char result;
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81 fd_set read_set;
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82
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83 FD_ZERO (&read_set);
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84 FD_SET (m_fd, &read_set);
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85 if (m_aux_fd != -1)
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86 FD_SET (m_aux_fd, &read_set);
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87
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88 int nfds = select (FD_SETSIZE, &read_set, NULL, NULL, NULL);
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89 if (nfds == -1)
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90 {
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91 if (errno == EINTR)
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92 continue;
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93 return FAIL;
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94 }
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95
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96 // We have to check the stderr fd first, to avoid a possible
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97 // blocking scenario when do_wait is called reentrantly. In
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98 // such a call, if we handle the primary fd first, then we may
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99 // re-enter this function, read from gcc's stderr, causing the
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100 // outer invocation of this function to block when trying to
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101 // read.
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102 if (m_aux_fd != -1 && FD_ISSET (m_aux_fd, &read_set))
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103 {
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104 char buf[1024];
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105 int n = read (m_aux_fd, buf, sizeof (buf) - 1);
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106 if (n < 0)
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107 return FAIL;
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108 if (n > 0)
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109 {
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110 buf[n] = '\0';
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111 print (buf);
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112 }
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113 }
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114
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115 if (FD_ISSET (m_fd, &read_set))
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116 {
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117 int n = read (m_fd, &result, 1);
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118 if (n == 0)
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119 return want_result ? FAIL : OK;
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120 if (n != 1)
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121 return FAIL;
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122
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123 switch (result)
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124 {
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125 case 'R':
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126 // The reply is ready; the caller will unmarshall it.
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127 return want_result ? OK : FAIL;
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128
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129 case 'Q':
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130 // While waiting for a reply, the other side made a method
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131 // call.
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132 {
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133 // Use an argument_wrapper here to simplify management
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134 // of the string's lifetime.
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135 argument_wrapper<char *> method_name;
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136
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137 if (!method_name.unmarshall (this))
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138 return FAIL;
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139
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140 callback_ftype *callback
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141 = m_callbacks.find_callback (method_name);
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142 // The call to CALLBACK is where we may end up in a
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143 // reentrant call.
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144 if (callback == NULL || !callback (this))
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145 return FAIL;
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146 }
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147 break;
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148
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149 default:
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150 return FAIL;
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151 }
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152 }
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153 }
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154 }
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