author | erikj |
Mon, 26 Jan 2015 10:24:25 +0100 | |
changeset 28658 | 344426303820 |
parent 25859 | jdk/src/java.base/unix/native/libnet/bsd_close.c@3317bb8137f4 |
child 37609 | 332ee9a0ec11 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2012, 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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#include <stdio.h> |
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#include <stdlib.h> |
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#include <sys/param.h> |
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#include <signal.h> |
30 |
#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/select.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 |
|
43 |
*/ |
|
44 |
typedef struct threadEntry { |
|
45 |
pthread_t thr; /* this thread */ |
|
46 |
struct threadEntry *next; /* next thread */ |
|
47 |
int intr; /* interrupted */ |
|
48 |
} threadEntry_t; |
|
49 |
||
50 |
/* |
|
51 |
* Heap allocated during initialized - one entry per fd |
|
52 |
*/ |
|
53 |
typedef struct { |
|
54 |
pthread_mutex_t lock; /* fd lock */ |
|
55 |
threadEntry_t *threads; /* threads blocked on fd */ |
|
56 |
} fdEntry_t; |
|
57 |
||
58 |
/* |
|
59 |
* Signal to unblock thread |
|
60 |
*/ |
|
61 |
static int sigWakeup = SIGIO; |
|
62 |
||
63 |
/* |
|
64 |
* The fd table and the number of file descriptors |
|
65 |
*/ |
|
66 |
static fdEntry_t *fdTable; |
|
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static int fdCount; |
|
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||
69 |
/* |
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* This limit applies if getlimit() returns unlimited. |
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* Unfortunately, this means if someone wants a higher limit |
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* then they have to set an explicit limit, higher than this, |
73 |
* which is probably counter-intuitive. |
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*/ |
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#define MAX_FD_COUNT 4096 |
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76 |
||
77 |
/* |
|
78 |
* Null signal handler |
|
79 |
*/ |
|
80 |
static void sig_wakeup(int sig) { |
|
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} |
|
82 |
||
83 |
/* |
|
84 |
* Initialization routine (executed when library is loaded) |
|
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* Allocate fd tables and sets up signal handler. |
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*/ |
|
87 |
static void __attribute((constructor)) 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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int i; |
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||
93 |
/* |
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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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getrlimit(RLIMIT_NOFILE, &nbr_files); |
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if (nbr_files.rlim_max == RLIM_INFINITY) { |
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fdCount = MAX_FD_COUNT; |
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} else { |
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fdCount = nbr_files.rlim_max; |
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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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"unable to allocate file descriptor table - out of memory"); |
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abort(); |
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} |
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109 |
for (i=0; i<fdCount; i++) { |
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110 |
pthread_mutex_init(&fdTable[i].lock, NULL); |
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} |
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113 |
/* |
|
114 |
* Setup the signal handler |
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*/ |
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sa.sa_handler = sig_wakeup; |
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sa.sa_flags = 0; |
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sigemptyset(&sa.sa_mask); |
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sigaction(sigWakeup, &sa, NULL); |
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121 |
sigemptyset(&sigset); |
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sigaddset(&sigset, sigWakeup); |
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sigprocmask(SIG_UNBLOCK, &sigset, NULL); |
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} |
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||
126 |
/* |
|
127 |
* Return the fd table for this fd or NULL is fd out |
|
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* of range. |
|
129 |
*/ |
|
130 |
static inline fdEntry_t *getFdEntry(int fd) |
|
131 |
{ |
|
132 |
if (fd < 0 || fd >= fdCount) { |
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return NULL; |
|
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} |
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return &fdTable[fd]; |
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} |
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||
138 |
/* |
|
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* Start a blocking operation :- |
|
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* Insert thread onto thread list for the fd. |
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*/ |
|
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static inline void startOp(fdEntry_t *fdEntry, threadEntry_t *self) |
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{ |
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self->thr = pthread_self(); |
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self->intr = 0; |
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pthread_mutex_lock(&(fdEntry->lock)); |
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{ |
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self->next = fdEntry->threads; |
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fdEntry->threads = self; |
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} |
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pthread_mutex_unlock(&(fdEntry->lock)); |
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} |
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||
155 |
/* |
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156 |
* End a blocking operation :- |
|
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* Remove thread from thread list for the fd |
|
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* If fd has been interrupted then set errno to EBADF |
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*/ |
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160 |
static inline void endOp |
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161 |
(fdEntry_t *fdEntry, threadEntry_t *self) |
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{ |
|
163 |
int orig_errno = errno; |
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pthread_mutex_lock(&(fdEntry->lock)); |
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{ |
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threadEntry_t *curr, *prev=NULL; |
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curr = fdEntry->threads; |
|
168 |
while (curr != NULL) { |
|
169 |
if (curr == self) { |
|
170 |
if (curr->intr) { |
|
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orig_errno = EBADF; |
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172 |
} |
|
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if (prev == NULL) { |
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fdEntry->threads = curr->next; |
|
175 |
} else { |
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176 |
prev->next = curr->next; |
|
177 |
} |
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178 |
break; |
|
179 |
} |
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prev = curr; |
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curr = curr->next; |
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} |
|
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} |
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pthread_mutex_unlock(&(fdEntry->lock)); |
|
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errno = orig_errno; |
|
186 |
} |
|
187 |
||
188 |
/* |
|
189 |
* Close or dup2 a file descriptor ensuring that all threads blocked on |
|
190 |
* the file descriptor are notified via a wakeup signal. |
|
191 |
* |
|
192 |
* fd1 < 0 => close(fd2) |
|
193 |
* fd1 >= 0 => dup2(fd1, fd2) |
|
194 |
* |
|
195 |
* Returns -1 with errno set if operation fails. |
|
196 |
*/ |
|
197 |
static int closefd(int fd1, int fd2) { |
|
198 |
int rv, orig_errno; |
|
199 |
fdEntry_t *fdEntry = getFdEntry(fd2); |
|
200 |
if (fdEntry == NULL) { |
|
201 |
errno = EBADF; |
|
202 |
return -1; |
|
203 |
} |
|
204 |
||
205 |
/* |
|
206 |
* Lock the fd to hold-off additional I/O on this fd. |
|
207 |
*/ |
|
208 |
pthread_mutex_lock(&(fdEntry->lock)); |
|
209 |
||
210 |
{ |
|
211 |
/* |
|
212 |
* Send a wakeup signal to all threads blocked on this |
|
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* file descriptor. |
|
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*/ |
|
215 |
threadEntry_t *curr = fdEntry->threads; |
|
216 |
while (curr != NULL) { |
|
217 |
curr->intr = 1; |
|
218 |
pthread_kill( curr->thr, sigWakeup ); |
|
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curr = curr->next; |
|
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} |
|
221 |
||
222 |
/* |
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* And close/dup the file descriptor |
|
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* (restart if interrupted by signal) |
|
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*/ |
|
226 |
do { |
|
227 |
if (fd1 < 0) { |
|
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rv = close(fd2); |
|
229 |
} else { |
|
230 |
rv = dup2(fd1, fd2); |
|
231 |
} |
|
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} while (rv == -1 && errno == EINTR); |
|
233 |
||
234 |
} |
|
235 |
||
236 |
/* |
|
237 |
* Unlock without destroying errno |
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238 |
*/ |
|
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orig_errno = errno; |
|
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pthread_mutex_unlock(&(fdEntry->lock)); |
|
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errno = orig_errno; |
|
242 |
||
243 |
return rv; |
|
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} |
|
245 |
||
246 |
/* |
|
247 |
* Wrapper for dup2 - same semantics as dup2 system call except |
|
248 |
* that any threads blocked in an I/O system call on fd2 will be |
|
249 |
* preempted and return -1/EBADF; |
|
250 |
*/ |
|
251 |
int NET_Dup2(int fd, int fd2) { |
|
252 |
if (fd < 0) { |
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253 |
errno = EBADF; |
|
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return -1; |
|
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} |
|
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return closefd(fd, fd2); |
|
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} |
|
258 |
||
259 |
/* |
|
260 |
* Wrapper for close - same semantics as close system call |
|
261 |
* except that any threads blocked in an I/O on fd will be |
|
262 |
* preempted and the I/O system call will return -1/EBADF. |
|
263 |
*/ |
|
264 |
int NET_SocketClose(int fd) { |
|
265 |
return closefd(-1, fd); |
|
266 |
} |
|
267 |
||
268 |
/************** Basic I/O operations here ***************/ |
|
269 |
||
270 |
/* |
|
271 |
* Macro to perform a blocking IO operation. Restarts |
|
272 |
* automatically if interrupted by signal (other than |
|
273 |
* our wakeup signal) |
|
274 |
*/ |
|
275 |
#define BLOCKING_IO_RETURN_INT(FD, FUNC) { \ |
|
276 |
int ret; \ |
|
277 |
threadEntry_t self; \ |
|
278 |
fdEntry_t *fdEntry = getFdEntry(FD); \ |
|
279 |
if (fdEntry == NULL) { \ |
|
280 |
errno = EBADF; \ |
|
281 |
return -1; \ |
|
282 |
} \ |
|
283 |
do { \ |
|
284 |
startOp(fdEntry, &self); \ |
|
285 |
ret = FUNC; \ |
|
286 |
endOp(fdEntry, &self); \ |
|
287 |
} while (ret == -1 && errno == EINTR); \ |
|
288 |
return ret; \ |
|
289 |
} |
|
290 |
||
291 |
int NET_Read(int s, void* buf, size_t len) { |
|
292 |
BLOCKING_IO_RETURN_INT( s, recv(s, buf, len, 0) ); |
|
293 |
} |
|
294 |
||
295 |
int NET_ReadV(int s, const struct iovec * vector, int count) { |
|
296 |
BLOCKING_IO_RETURN_INT( s, readv(s, vector, count) ); |
|
297 |
} |
|
298 |
||
299 |
int NET_RecvFrom(int s, void *buf, int len, unsigned int flags, |
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struct sockaddr *from, socklen_t *fromlen) { |
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BLOCKING_IO_RETURN_INT( s, recvfrom(s, buf, len, flags, from, fromlen) ); |
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} |
303 |
||
304 |
int NET_Send(int s, void *msg, int len, unsigned int flags) { |
|
305 |
BLOCKING_IO_RETURN_INT( s, send(s, msg, len, flags) ); |
|
306 |
} |
|
307 |
||
308 |
int NET_WriteV(int s, const struct iovec * vector, int count) { |
|
309 |
BLOCKING_IO_RETURN_INT( s, writev(s, vector, count) ); |
|
310 |
} |
|
311 |
||
312 |
int NET_SendTo(int s, const void *msg, int len, unsigned int |
|
313 |
flags, const struct sockaddr *to, int tolen) { |
|
314 |
BLOCKING_IO_RETURN_INT( s, sendto(s, msg, len, flags, to, tolen) ); |
|
315 |
} |
|
316 |
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int NET_Accept(int s, struct sockaddr *addr, socklen_t *addrlen) { |
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318 |
BLOCKING_IO_RETURN_INT( s, accept(s, addr, addrlen) ); |
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} |
320 |
||
321 |
int NET_Connect(int s, struct sockaddr *addr, int addrlen) { |
|
322 |
BLOCKING_IO_RETURN_INT( s, connect(s, addr, addrlen) ); |
|
323 |
} |
|
324 |
||
325 |
int NET_Poll(struct pollfd *ufds, unsigned int nfds, int timeout) { |
|
326 |
BLOCKING_IO_RETURN_INT( ufds[0].fd, poll(ufds, nfds, timeout) ); |
|
327 |
} |
|
328 |
||
329 |
/* |
|
330 |
* Wrapper for select(s, timeout). We are using select() on Mac OS due to Bug 7131399. |
|
331 |
* Auto restarts with adjusted timeout if interrupted by |
|
332 |
* signal other than our wakeup signal. |
|
333 |
*/ |
|
23048 | 334 |
int NET_Timeout(int s, long timeout) { |
12047 | 335 |
long prevtime = 0, newtime; |
336 |
struct timeval t, *tp = &t; |
|
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fd_set fds; |
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338 |
fd_set* fdsp = NULL; |
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int allocated = 0; |
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340 |
threadEntry_t self; |
12047 | 341 |
fdEntry_t *fdEntry = getFdEntry(s); |
342 |
||
343 |
/* |
|
344 |
* Check that fd hasn't been closed. |
|
345 |
*/ |
|
346 |
if (fdEntry == NULL) { |
|
347 |
errno = EBADF; |
|
348 |
return -1; |
|
349 |
} |
|
350 |
||
351 |
/* |
|
352 |
* Pick up current time as may need to adjust timeout |
|
353 |
*/ |
|
354 |
if (timeout > 0) { |
|
355 |
/* Timed */ |
|
356 |
struct timeval now; |
|
357 |
gettimeofday(&now, NULL); |
|
358 |
prevtime = now.tv_sec * 1000 + now.tv_usec / 1000; |
|
359 |
t.tv_sec = timeout / 1000; |
|
360 |
t.tv_usec = (timeout % 1000) * 1000; |
|
361 |
} else if (timeout < 0) { |
|
362 |
/* Blocking */ |
|
363 |
tp = 0; |
|
364 |
} else { |
|
365 |
/* Poll */ |
|
366 |
t.tv_sec = 0; |
|
367 |
t.tv_usec = 0; |
|
368 |
} |
|
369 |
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370 |
if (s < FD_SETSIZE) { |
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371 |
fdsp = &fds; |
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372 |
FD_ZERO(fdsp); |
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373 |
} else { |
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374 |
int length = (howmany(s+1, NFDBITS)) * sizeof(int); |
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375 |
fdsp = (fd_set *) calloc(1, length); |
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376 |
if (fdsp == NULL) { |
23048 | 377 |
return -1; // errno will be set to ENOMEM |
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378 |
} |
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379 |
allocated = 1; |
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380 |
} |
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381 |
FD_SET(s, fdsp); |
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|
382 |
|
12047 | 383 |
for(;;) { |
384 |
int rv; |
|
385 |
||
386 |
/* |
|
387 |
* call select on the fd. If interrupted by our wakeup signal |
|
388 |
* errno will be set to EBADF. |
|
389 |
*/ |
|
390 |
||
391 |
startOp(fdEntry, &self); |
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|
392 |
rv = select(s+1, fdsp, 0, 0, tp); |
12047 | 393 |
endOp(fdEntry, &self); |
394 |
||
395 |
/* |
|
396 |
* If interrupted then adjust timeout. If timeout |
|
397 |
* has expired return 0 (indicating timeout expired). |
|
398 |
*/ |
|
399 |
if (rv < 0 && errno == EINTR) { |
|
400 |
if (timeout > 0) { |
|
401 |
struct timeval now; |
|
402 |
gettimeofday(&now, NULL); |
|
403 |
newtime = now.tv_sec * 1000 + now.tv_usec / 1000; |
|
404 |
timeout -= newtime - prevtime; |
|
405 |
if (timeout <= 0) { |
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|
406 |
if (allocated != 0) |
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changeset
|
407 |
free(fdsp); |
12047 | 408 |
return 0; |
409 |
} |
|
410 |
prevtime = newtime; |
|
411 |
t.tv_sec = timeout / 1000; |
|
412 |
t.tv_usec = (timeout % 1000) * 1000; |
|
413 |
} |
|
414 |
} else { |
|
23043
15face72cb3b
8035897: Better memory allocation for file descriptors greater than 1024 on macosx
chegar
parents:
23033
diff
changeset
|
415 |
if (allocated != 0) |
15face72cb3b
8035897: Better memory allocation for file descriptors greater than 1024 on macosx
chegar
parents:
23033
diff
changeset
|
416 |
free(fdsp); |
12047 | 417 |
return rv; |
418 |
} |
|
419 |
||
420 |
} |
|
421 |
} |