]>
Commit | Line | Data |
---|---|---|
ddc8de03 | 1 | /* Connect implementation |
99dee823 | 2 | Copyright (C) 2014-2021 Free Software Foundation, Inc. |
ddc8de03 PM |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 3, or (at your option) any later | |
9 | version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING3. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <cc1plugin-config.h> | |
21 | #include <string> | |
22 | #include <unistd.h> | |
23 | #include <sys/types.h> | |
0ed4f879 | 24 | #include <string.h> |
ddc8de03 PM |
25 | #include <errno.h> |
26 | #include "marshall.hh" | |
27 | #include "connection.hh" | |
28 | #include "rpc.hh" | |
29 | ||
ddc8de03 PM |
30 | cc1_plugin::status |
31 | cc1_plugin::connection::send (char c) | |
32 | { | |
33 | if (write (m_fd, &c, 1) != 1) | |
34 | return FAIL; | |
35 | return OK; | |
36 | } | |
37 | ||
38 | cc1_plugin::status | |
39 | cc1_plugin::connection::send (const void *buf, int len) | |
40 | { | |
41 | if (write (m_fd, buf, len) != len) | |
42 | return FAIL; | |
43 | return OK; | |
44 | } | |
45 | ||
46 | cc1_plugin::status | |
47 | cc1_plugin::connection::require (char c) | |
48 | { | |
49 | char result; | |
50 | ||
51 | if (read (m_fd, &result, 1) != 1 | |
52 | || result != c) | |
53 | return FAIL; | |
54 | ||
55 | return OK; | |
56 | } | |
57 | ||
58 | cc1_plugin::status | |
59 | cc1_plugin::connection::get (void *buf, int len) | |
60 | { | |
61 | if (read (m_fd, buf, len) != len) | |
62 | return FAIL; | |
63 | return OK; | |
64 | } | |
65 | ||
66 | cc1_plugin::status | |
67 | cc1_plugin::connection::do_wait (bool want_result) | |
68 | { | |
69 | while (true) | |
70 | { | |
71 | char result; | |
72 | fd_set read_set; | |
73 | ||
74 | FD_ZERO (&read_set); | |
75 | FD_SET (m_fd, &read_set); | |
76 | if (m_aux_fd != -1) | |
77 | FD_SET (m_aux_fd, &read_set); | |
78 | ||
79 | int nfds = select (FD_SETSIZE, &read_set, NULL, NULL, NULL); | |
80 | if (nfds == -1) | |
81 | { | |
82 | if (errno == EINTR) | |
83 | continue; | |
84 | return FAIL; | |
85 | } | |
86 | ||
87 | // We have to check the stderr fd first, to avoid a possible | |
88 | // blocking scenario when do_wait is called reentrantly. In | |
89 | // such a call, if we handle the primary fd first, then we may | |
90 | // re-enter this function, read from gcc's stderr, causing the | |
91 | // outer invocation of this function to block when trying to | |
92 | // read. | |
93 | if (m_aux_fd != -1 && FD_ISSET (m_aux_fd, &read_set)) | |
94 | { | |
95 | char buf[1024]; | |
96 | int n = read (m_aux_fd, buf, sizeof (buf) - 1); | |
97 | if (n < 0) | |
98 | return FAIL; | |
99 | if (n > 0) | |
100 | { | |
101 | buf[n] = '\0'; | |
102 | print (buf); | |
103 | } | |
104 | } | |
105 | ||
106 | if (FD_ISSET (m_fd, &read_set)) | |
107 | { | |
108 | int n = read (m_fd, &result, 1); | |
109 | if (n == 0) | |
110 | return want_result ? FAIL : OK; | |
111 | if (n != 1) | |
112 | return FAIL; | |
113 | ||
114 | switch (result) | |
115 | { | |
116 | case 'R': | |
117 | // The reply is ready; the caller will unmarshall it. | |
118 | return want_result ? OK : FAIL; | |
119 | ||
120 | case 'Q': | |
121 | // While waiting for a reply, the other side made a method | |
122 | // call. | |
123 | { | |
124 | // Use an argument_wrapper here to simplify management | |
125 | // of the string's lifetime. | |
126 | argument_wrapper<char *> method_name; | |
127 | ||
128 | if (!method_name.unmarshall (this)) | |
129 | return FAIL; | |
130 | ||
131 | callback_ftype *callback | |
8fdffa48 | 132 | = m_callbacks.find_callback (method_name.get ()); |
ddc8de03 PM |
133 | // The call to CALLBACK is where we may end up in a |
134 | // reentrant call. | |
135 | if (callback == NULL || !callback (this)) | |
136 | return FAIL; | |
137 | } | |
138 | break; | |
139 | ||
140 | default: | |
141 | return FAIL; | |
142 | } | |
143 | } | |
144 | } | |
145 | } |