Mercurial > trustbridge > nss-cmake-static

comparison nspr/pr/src/io/prpolevt.c @ 0:1e5118fa0cb1

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This is NSS with a Cmake Buildsyste To compile a static NSS library for Windows we've used the Chromium-NSS fork and added a Cmake buildsystem to compile it statically for Windows. See README.chromium for chromium changes and README.trustbridge for our modifications.
author Andre Heinecke <andre.heinecke@intevation.de>
date Mon, 28 Jul 2014 10:47:06 +0200
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 /*
7 *********************************************************************
8 *
9 * Pollable events
10 *
11 * Pollable events are implemented using layered I/O. The only
12 * I/O methods that are implemented for pollable events are poll
13 * and close. No other methods can be invoked on a pollable
14 * event.
15 *
16 * A pipe or socket pair is created and the pollable event layer
17 * is pushed onto the read end. A pointer to the write end is
18 * saved in the PRFilePrivate structure of the pollable event.
19 *
20 *********************************************************************
21 */
22
23 #include "prinit.h"
24 #include "prio.h"
25 #include "prmem.h"
26 #include "prerror.h"
27 #include "prlog.h"
28
29 /*
30 * These internal functions are declared in primpl.h,
31 * but we can't include primpl.h because the definition
32 * of struct PRFilePrivate in this file (for the pollable
33 * event layer) will conflict with the definition of
34 * struct PRFilePrivate in primpl.h (for the NSPR layer).
35 */
36 extern PRIntn _PR_InvalidInt(void);
37 extern PRInt64 _PR_InvalidInt64(void);
38 extern PRStatus _PR_InvalidStatus(void);
39 extern PRFileDesc *_PR_InvalidDesc(void);
40
41 /*
42 * PRFilePrivate structure for the NSPR pollable events layer
43 */
44 struct PRFilePrivate {
45 PRFileDesc *writeEnd; /* the write end of the pipe/socketpair */
46 };
47
48 static PRStatus PR_CALLBACK _pr_PolEvtClose(PRFileDesc *fd);
49
50 static PRInt16 PR_CALLBACK _pr_PolEvtPoll(
51 PRFileDesc *fd, PRInt16 in_flags, PRInt16 *out_flags);
52
53 static PRIOMethods _pr_polevt_methods = {
54 PR_DESC_LAYERED,
55 _pr_PolEvtClose,
56 (PRReadFN)_PR_InvalidInt,
57 (PRWriteFN)_PR_InvalidInt,
58 (PRAvailableFN)_PR_InvalidInt,
59 (PRAvailable64FN)_PR_InvalidInt64,
60 (PRFsyncFN)_PR_InvalidStatus,
61 (PRSeekFN)_PR_InvalidInt,
62 (PRSeek64FN)_PR_InvalidInt64,
63 (PRFileInfoFN)_PR_InvalidStatus,
64 (PRFileInfo64FN)_PR_InvalidStatus,
65 (PRWritevFN)_PR_InvalidInt,
66 (PRConnectFN)_PR_InvalidStatus,
67 (PRAcceptFN)_PR_InvalidDesc,
68 (PRBindFN)_PR_InvalidStatus,
69 (PRListenFN)_PR_InvalidStatus,
70 (PRShutdownFN)_PR_InvalidStatus,
71 (PRRecvFN)_PR_InvalidInt,
72 (PRSendFN)_PR_InvalidInt,
73 (PRRecvfromFN)_PR_InvalidInt,
74 (PRSendtoFN)_PR_InvalidInt,
75 _pr_PolEvtPoll,
76 (PRAcceptreadFN)_PR_InvalidInt,
77 (PRTransmitfileFN)_PR_InvalidInt,
78 (PRGetsocknameFN)_PR_InvalidStatus,
79 (PRGetpeernameFN)_PR_InvalidStatus,
80 (PRReservedFN)_PR_InvalidInt,
81 (PRReservedFN)_PR_InvalidInt,
82 (PRGetsocketoptionFN)_PR_InvalidStatus,
83 (PRSetsocketoptionFN)_PR_InvalidStatus,
84 (PRSendfileFN)_PR_InvalidInt,
85 (PRConnectcontinueFN)_PR_InvalidStatus,
86 (PRReservedFN)_PR_InvalidInt,
87 (PRReservedFN)_PR_InvalidInt,
88 (PRReservedFN)_PR_InvalidInt,
89 (PRReservedFN)_PR_InvalidInt
90 };
91
92 static PRDescIdentity _pr_polevt_id;
93 static PRCallOnceType _pr_polevt_once_control;
94 static PRStatus PR_CALLBACK _pr_PolEvtInit(void);
95
96 static PRInt16 PR_CALLBACK _pr_PolEvtPoll(
97 PRFileDesc *fd, PRInt16 in_flags, PRInt16 *out_flags)
98 {
99 return (fd->lower->methods->poll)(fd->lower, in_flags, out_flags);
100 }
101
102 static PRStatus PR_CALLBACK _pr_PolEvtInit(void)
103 {
104 _pr_polevt_id = PR_GetUniqueIdentity("NSPR pollable events");
105 if (PR_INVALID_IO_LAYER == _pr_polevt_id) {
106 return PR_FAILURE;
107 }
108 return PR_SUCCESS;
109 }
110
111 #if !defined(XP_UNIX)
112 #define USE_TCP_SOCKETPAIR
113 #endif
114
115 PR_IMPLEMENT(PRFileDesc *) PR_NewPollableEvent(void)
116 {
117 PRFileDesc *event;
118 PRFileDesc *fd[2]; /* fd[0] is the read end; fd[1] is the write end */
119 #ifdef USE_TCP_SOCKETPAIR
120 PRSocketOptionData socket_opt;
121 PRStatus rv;
122 #endif
123
124 fd[0] = fd[1] = NULL;
125
126 if (PR_CallOnce(&_pr_polevt_once_control, _pr_PolEvtInit) == PR_FAILURE) {
127 return NULL;
128 }
129
130 event = PR_CreateIOLayerStub(_pr_polevt_id, &_pr_polevt_methods);
131 if (NULL == event) {
132 goto errorExit;
133 }
134 event->secret = PR_NEW(PRFilePrivate);
135 if (event->secret == NULL) {
136 PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
137 goto errorExit;
138 }
139
140 #ifndef USE_TCP_SOCKETPAIR
141 if (PR_CreatePipe(&fd[0], &fd[1]) == PR_FAILURE) {
142 fd[0] = fd[1] = NULL;
143 goto errorExit;
144 }
145 #else
146 if (PR_NewTCPSocketPair(fd) == PR_FAILURE) {
147 fd[0] = fd[1] = NULL;
148 goto errorExit;
149 }
150 /*
151 * set the TCP_NODELAY option to reduce notification latency
152 */
153 socket_opt.option = PR_SockOpt_NoDelay;
154 socket_opt.value.no_delay = PR_TRUE;
155 rv = PR_SetSocketOption(fd[1], &socket_opt);
156 PR_ASSERT(PR_SUCCESS == rv);
157 #endif
158
159 event->secret->writeEnd = fd[1];
160 if (PR_PushIOLayer(fd[0], PR_TOP_IO_LAYER, event) == PR_FAILURE) {
161 goto errorExit;
162 }
163
164 return fd[0];
165
166 errorExit:
167 if (fd[0]) {
168 PR_Close(fd[0]);
169 PR_Close(fd[1]);
170 }
171 if (event) {
172 PR_DELETE(event->secret);
173 event->dtor(event);
174 }
175 return NULL;
176 }
177
178 static PRStatus PR_CALLBACK _pr_PolEvtClose(PRFileDesc *fd)
179 {
180 PRFileDesc *event;
181
182 event = PR_PopIOLayer(fd, PR_TOP_IO_LAYER);
183 PR_ASSERT(NULL == event->higher && NULL == event->lower);
184 PR_Close(fd);
185 PR_Close(event->secret->writeEnd);
186 PR_DELETE(event->secret);
187 event->dtor(event);
188 return PR_SUCCESS;
189 }
190
191 PR_IMPLEMENT(PRStatus) PR_DestroyPollableEvent(PRFileDesc *event)
192 {
193 return PR_Close(event);
194 }
195
196 static const char magicChar = '\x38';
197
198 PR_IMPLEMENT(PRStatus) PR_SetPollableEvent(PRFileDesc *event)
199 {
200 if (PR_Write(event->secret->writeEnd, &magicChar, 1) != 1) {
201 return PR_FAILURE;
202 }
203 return PR_SUCCESS;
204 }
205
206 PR_IMPLEMENT(PRStatus) PR_WaitForPollableEvent(PRFileDesc *event)
207 {
208 char buf[1024];
209 PRInt32 nBytes;
210 #ifdef DEBUG
211 PRIntn i;
212 #endif
213
214 nBytes = PR_Read(event->lower, buf, sizeof(buf));
215 if (nBytes == -1) {
216 return PR_FAILURE;
217 }
218
219 #ifdef DEBUG
220 /*
221 * Make sure people do not write to the pollable event fd
222 * directly.
223 */
224 for (i = 0; i < nBytes; i++) {
225 PR_ASSERT(buf[i] == magicChar);
226 }
227 #endif
228
229 return PR_SUCCESS;
230 }
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