author | simonis |
Tue, 26 Nov 2013 16:40:31 +0100 | |
changeset 22597 | 7515a991bb37 |
child 22605 | dba3d6b22818 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* |
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* This file contains implementations of NET_... functions. The NET_.. functions are |
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* wrappers for common file- and socket functions plus provisions for non-blocking IO. |
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* |
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* (basically, the layers remember all file descriptors waiting for a particular fd; |
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* all threads waiting on a certain fd can be woken up by sending them a signal; this |
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* is done e.g. when the fd is closed.) |
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* |
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* This was originally copied from the linux_close.c implementation. |
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* |
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* Side Note: This coding needs initialization. Under Linux this is done |
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* automatically via __attribute((constructor)), on AIX this is done manually |
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* (see aix_close_init). |
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* |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <signal.h> |
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#include <pthread.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <sys/time.h> |
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#include <sys/resource.h> |
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#include <sys/uio.h> |
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#include <unistd.h> |
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#include <errno.h> |
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#include <sys/poll.h> |
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|
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/* |
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* Stack allocated by thread when doing blocking operation |
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*/ |
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typedef struct threadEntry { |
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pthread_t thr; /* this thread */ |
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struct threadEntry *next; /* next thread */ |
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int intr; /* interrupted */ |
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} threadEntry_t; |
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/* |
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* Heap allocated during initialized - one entry per fd |
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*/ |
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typedef struct { |
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pthread_mutex_t lock; /* fd lock */ |
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threadEntry_t *threads; /* threads blocked on fd */ |
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} fdEntry_t; |
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/* |
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* Signal to unblock thread |
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*/ |
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static int sigWakeup = (SIGRTMAX - 1); |
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|
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/* |
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* The fd table and the number of file descriptors |
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*/ |
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static fdEntry_t *fdTable = NULL; |
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static int fdCount = 0; |
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|
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/* |
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* Null signal handler |
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*/ |
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static void sig_wakeup(int sig) { |
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} |
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|
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/* |
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* Initialization routine (executed when library is loaded) |
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* Allocate fd tables and sets up signal handler. |
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* |
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* On AIX we don't have __attribute((constructor)) so we need to initialize |
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* manually (from JNI_OnLoad() in 'src/share/native/java/net/net_util.c') |
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*/ |
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void aix_close_init() { |
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struct rlimit nbr_files; |
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sigset_t sigset; |
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struct sigaction sa; |
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/* Check already initialized */ |
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if (fdCount > 0 && fdTable != NULL) { |
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return; |
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} |
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/* |
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* Allocate table based on the maximum number of |
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* file descriptors. |
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*/ |
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if (-1 == getrlimit(RLIMIT_NOFILE, &nbr_files)) { |
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fprintf(stderr, "library initialization failed - " |
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"unable to get max # of allocated fds\n"); |
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abort(); |
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} |
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fdCount = nbr_files.rlim_max; |
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/* |
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* We have a conceptual problem here, when the number of files is |
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* unlimited. As a kind of workaround, we ensure the table is big |
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* enough for handle even a large number of files. Since SAP itself |
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* recommends a limit of 32000 files, we just use 64000 as 'infinity'. |
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*/ |
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if (nbr_files.rlim_max == RLIM_INFINITY) { |
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fdCount = 64000; |
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} |
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fdTable = (fdEntry_t *)calloc(fdCount, sizeof(fdEntry_t)); |
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if (fdTable == NULL) { |
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fprintf(stderr, "library initialization failed - " |
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128 |
"unable to allocate file descriptor table - out of memory"); |
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129 |
abort(); |
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130 |
} |
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131 |
|
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132 |
{ |
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133 |
int i; |
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134 |
for (i=0; i < fdCount; i++) { |
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135 |
pthread_mutex_init(&fdTable[i].lock, NULL); |
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136 |
} |
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137 |
} |
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138 |
|
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139 |
/* |
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140 |
* Setup the signal handler |
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141 |
*/ |
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142 |
sa.sa_handler = sig_wakeup; |
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143 |
sa.sa_flags = 0; |
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144 |
sigemptyset(&sa.sa_mask); |
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145 |
sigaction(sigWakeup, &sa, NULL); |
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146 |
|
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147 |
sigemptyset(&sigset); |
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148 |
sigaddset(&sigset, sigWakeup); |
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149 |
sigprocmask(SIG_UNBLOCK, &sigset, NULL); |
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150 |
} |
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151 |
|
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152 |
/* |
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153 |
* Return the fd table for this fd or NULL is fd out |
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154 |
* of range. |
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155 |
*/ |
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156 |
static inline fdEntry_t *getFdEntry(int fd) |
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157 |
{ |
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158 |
if (fd < 0 || fd >= fdCount) { |
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159 |
return NULL; |
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160 |
} |
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161 |
return &fdTable[fd]; |
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162 |
} |
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163 |
|
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164 |
/* |
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165 |
* Start a blocking operation :- |
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166 |
* Insert thread onto thread list for the fd. |
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167 |
*/ |
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168 |
static inline void startOp(fdEntry_t *fdEntry, threadEntry_t *self) |
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169 |
{ |
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170 |
self->thr = pthread_self(); |
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171 |
self->intr = 0; |
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172 |
|
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173 |
pthread_mutex_lock(&(fdEntry->lock)); |
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174 |
{ |
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175 |
self->next = fdEntry->threads; |
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176 |
fdEntry->threads = self; |
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177 |
} |
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178 |
pthread_mutex_unlock(&(fdEntry->lock)); |
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179 |
} |
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180 |
|
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181 |
/* |
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182 |
* End a blocking operation :- |
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183 |
* Remove thread from thread list for the fd |
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184 |
* If fd has been interrupted then set errno to EBADF |
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185 |
*/ |
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186 |
static inline void endOp |
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187 |
(fdEntry_t *fdEntry, threadEntry_t *self) |
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188 |
{ |
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189 |
int orig_errno = errno; |
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190 |
pthread_mutex_lock(&(fdEntry->lock)); |
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|
191 |
{ |
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192 |
threadEntry_t *curr, *prev=NULL; |
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|
193 |
curr = fdEntry->threads; |
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|
194 |
while (curr != NULL) { |
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|
195 |
if (curr == self) { |
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|
196 |
if (curr->intr) { |
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|
197 |
orig_errno = EBADF; |
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|
198 |
} |
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|
199 |
if (prev == NULL) { |
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200 |
fdEntry->threads = curr->next; |
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|
201 |
} else { |
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202 |
prev->next = curr->next; |
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|
203 |
} |
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|
204 |
break; |
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|
205 |
} |
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|
206 |
prev = curr; |
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|
207 |
curr = curr->next; |
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|
208 |
} |
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|
209 |
} |
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210 |
pthread_mutex_unlock(&(fdEntry->lock)); |
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|
211 |
errno = orig_errno; |
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|
212 |
} |
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|
213 |
|
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214 |
/* |
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215 |
* Close or dup2 a file descriptor ensuring that all threads blocked on |
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216 |
* the file descriptor are notified via a wakeup signal. |
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217 |
* |
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218 |
* fd1 < 0 => close(fd2) |
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219 |
* fd1 >= 0 => dup2(fd1, fd2) |
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220 |
* |
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221 |
* Returns -1 with errno set if operation fails. |
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|
222 |
*/ |
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|
223 |
static int closefd(int fd1, int fd2) { |
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|
224 |
int rv, orig_errno; |
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225 |
fdEntry_t *fdEntry = getFdEntry(fd2); |
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|
226 |
if (fdEntry == NULL) { |
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|
227 |
errno = EBADF; |
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|
228 |
return -1; |
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|
229 |
} |
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|
230 |
|
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|
231 |
/* |
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|
232 |
* Lock the fd to hold-off additional I/O on this fd. |
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233 |
*/ |
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234 |
pthread_mutex_lock(&(fdEntry->lock)); |
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|
235 |
|
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|
236 |
{ |
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|
237 |
/* |
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|
238 |
* And close/dup the file descriptor |
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|
239 |
* (restart if interrupted by signal) |
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|
240 |
*/ |
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|
241 |
do { |
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|
242 |
if (fd1 < 0) { |
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|
243 |
rv = close(fd2); |
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|
244 |
} else { |
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|
245 |
rv = dup2(fd1, fd2); |
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|
246 |
} |
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247 |
} while (rv == -1 && errno == EINTR); |
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248 |
|
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|
249 |
/* |
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250 |
* Send a wakeup signal to all threads blocked on this |
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|
251 |
* file descriptor. |
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|
252 |
*/ |
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|
253 |
threadEntry_t *curr = fdEntry->threads; |
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|
254 |
while (curr != NULL) { |
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|
255 |
curr->intr = 1; |
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|
256 |
pthread_kill( curr->thr, sigWakeup ); |
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|
257 |
curr = curr->next; |
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|
258 |
} |
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259 |
} |
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|
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/* |
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* Unlock without destroying errno |
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263 |
*/ |
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orig_errno = errno; |
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pthread_mutex_unlock(&(fdEntry->lock)); |
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errno = orig_errno; |
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267 |
|
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return rv; |
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} |
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|
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/* |
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* Wrapper for dup2 - same semantics as dup2 system call except |
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* that any threads blocked in an I/O system call on fd2 will be |
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* preempted and return -1/EBADF; |
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*/ |
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int NET_Dup2(int fd, int fd2) { |
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if (fd < 0) { |
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errno = EBADF; |
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return -1; |
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280 |
} |
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return closefd(fd, fd2); |
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} |
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283 |
|
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284 |
/* |
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285 |
* Wrapper for close - same semantics as close system call |
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* except that any threads blocked in an I/O on fd will be |
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* preempted and the I/O system call will return -1/EBADF. |
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*/ |
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int NET_SocketClose(int fd) { |
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return closefd(-1, fd); |
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291 |
} |
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292 |
|
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293 |
/************** Basic I/O operations here ***************/ |
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294 |
|
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295 |
/* |
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296 |
* Macro to perform a blocking IO operation. Restarts |
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297 |
* automatically if interrupted by signal (other than |
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|
298 |
* our wakeup signal) |
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299 |
*/ |
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300 |
#define BLOCKING_IO_RETURN_INT(FD, FUNC) { \ |
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301 |
int ret; \ |
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302 |
threadEntry_t self; \ |
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303 |
fdEntry_t *fdEntry = getFdEntry(FD); \ |
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304 |
if (fdEntry == NULL) { \ |
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|
305 |
errno = EBADF; \ |
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|
306 |
return -1; \ |
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|
307 |
} \ |
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308 |
do { \ |
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309 |
startOp(fdEntry, &self); \ |
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|
310 |
ret = FUNC; \ |
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311 |
endOp(fdEntry, &self); \ |
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312 |
} while (ret == -1 && errno == EINTR); \ |
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313 |
return ret; \ |
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|
314 |
} |
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|
315 |
|
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316 |
int NET_Read(int s, void* buf, size_t len) { |
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317 |
BLOCKING_IO_RETURN_INT( s, recv(s, buf, len, 0) ); |
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|
318 |
} |
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|
319 |
|
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|
320 |
int NET_ReadV(int s, const struct iovec * vector, int count) { |
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321 |
BLOCKING_IO_RETURN_INT( s, readv(s, vector, count) ); |
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|
322 |
} |
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|
323 |
|
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324 |
int NET_RecvFrom(int s, void *buf, int len, unsigned int flags, |
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325 |
struct sockaddr *from, int *fromlen) { |
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|
326 |
socklen_t socklen = *fromlen; |
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|
327 |
BLOCKING_IO_RETURN_INT( s, recvfrom(s, buf, len, flags, from, &socklen) ); |
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|
328 |
*fromlen = socklen; |
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|
329 |
} |
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|
330 |
|
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|
331 |
int NET_Send(int s, void *msg, int len, unsigned int flags) { |
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|
332 |
BLOCKING_IO_RETURN_INT( s, send(s, msg, len, flags) ); |
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|
333 |
} |
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|
334 |
|
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|
335 |
int NET_WriteV(int s, const struct iovec * vector, int count) { |
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|
336 |
BLOCKING_IO_RETURN_INT( s, writev(s, vector, count) ); |
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|
337 |
} |
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|
338 |
|
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|
339 |
int NET_SendTo(int s, const void *msg, int len, unsigned int |
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|
340 |
flags, const struct sockaddr *to, int tolen) { |
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|
341 |
BLOCKING_IO_RETURN_INT( s, sendto(s, msg, len, flags, to, tolen) ); |
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|
342 |
} |
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|
343 |
|
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|
344 |
int NET_Accept(int s, struct sockaddr *addr, int *addrlen) { |
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|
345 |
socklen_t socklen = *addrlen; |
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|
346 |
BLOCKING_IO_RETURN_INT( s, accept(s, addr, &socklen) ); |
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|
347 |
*addrlen = socklen; |
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|
348 |
} |
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|
349 |
|
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|
350 |
int NET_Connect(int s, struct sockaddr *addr, int addrlen) { |
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|
351 |
BLOCKING_IO_RETURN_INT( s, connect(s, addr, addrlen) ); |
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|
352 |
} |
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|
353 |
|
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|
354 |
#ifndef USE_SELECT |
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|
355 |
int NET_Poll(struct pollfd *ufds, unsigned int nfds, int timeout) { |
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|
356 |
BLOCKING_IO_RETURN_INT( ufds[0].fd, poll(ufds, nfds, timeout) ); |
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|
357 |
} |
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|
358 |
#else |
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|
359 |
int NET_Select(int s, fd_set *readfds, fd_set *writefds, |
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|
360 |
fd_set *exceptfds, struct timeval *timeout) { |
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|
361 |
BLOCKING_IO_RETURN_INT( s-1, |
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|
362 |
select(s, readfds, writefds, exceptfds, timeout) ); |
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|
363 |
} |
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|
364 |
#endif |
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|
365 |
|
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|
366 |
/* |
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|
367 |
* Wrapper for poll(s, timeout). |
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|
368 |
* Auto restarts with adjusted timeout if interrupted by |
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|
369 |
* signal other than our wakeup signal. |
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|
370 |
*/ |
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|
371 |
int NET_Timeout(int s, long timeout) { |
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|
372 |
long prevtime = 0, newtime; |
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|
373 |
struct timeval t; |
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|
374 |
fdEntry_t *fdEntry = getFdEntry(s); |
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|
375 |
|
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|
376 |
/* |
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|
377 |
* Check that fd hasn't been closed. |
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|
378 |
*/ |
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|
379 |
if (fdEntry == NULL) { |
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|
380 |
errno = EBADF; |
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|
381 |
return -1; |
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|
382 |
} |
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|
383 |
|
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|
384 |
/* |
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|
385 |
* Pick up current time as may need to adjust timeout |
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|
386 |
*/ |
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|
387 |
if (timeout > 0) { |
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388 |
gettimeofday(&t, NULL); |
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389 |
prevtime = t.tv_sec * 1000 + t.tv_usec / 1000; |
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390 |
} |
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|
391 |
|
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392 |
for(;;) { |
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393 |
struct pollfd pfd; |
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394 |
int rv; |
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|
395 |
threadEntry_t self; |
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|
396 |
|
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397 |
/* |
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398 |
* Poll the fd. If interrupted by our wakeup signal |
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399 |
* errno will be set to EBADF. |
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400 |
*/ |
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|
401 |
pfd.fd = s; |
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402 |
pfd.events = POLLIN | POLLERR; |
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|
403 |
|
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404 |
startOp(fdEntry, &self); |
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405 |
rv = poll(&pfd, 1, timeout); |
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406 |
endOp(fdEntry, &self); |
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|
407 |
|
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408 |
/* |
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409 |
* If interrupted then adjust timeout. If timeout |
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410 |
* has expired return 0 (indicating timeout expired). |
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411 |
*/ |
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412 |
if (rv < 0 && errno == EINTR) { |
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|
413 |
if (timeout > 0) { |
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414 |
gettimeofday(&t, NULL); |
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415 |
newtime = t.tv_sec * 1000 + t.tv_usec / 1000; |
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416 |
timeout -= newtime - prevtime; |
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|
417 |
if (timeout <= 0) { |
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|
418 |
return 0; |
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|
419 |
} |
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|
420 |
prevtime = newtime; |
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|
421 |
} |
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|
422 |
} else { |
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|
423 |
return rv; |
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|
424 |
} |
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|
425 |
|
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|
426 |
} |
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427 |
} |