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da2b3a17 | 1 | |
30a4f2a8 | 2 | /* |
c7989865 | 3 | * $Id: comm.cc,v 1.193 1997/10/25 16:47:06 wessels Exp $ |
30a4f2a8 | 4 | * |
5 | * DEBUG: section 5 Socket Functions | |
6 | * AUTHOR: Harvest Derived | |
7 | * | |
42c04c16 | 8 | * SQUID Internet Object Cache http://squid.nlanr.net/Squid/ |
30a4f2a8 | 9 | * -------------------------------------------------------- |
10 | * | |
11 | * Squid is the result of efforts by numerous individuals from the | |
12 | * Internet community. Development is led by Duane Wessels of the | |
13 | * National Laboratory for Applied Network Research and funded by | |
14 | * the National Science Foundation. | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License as published by | |
18 | * the Free Software Foundation; either version 2 of the License, or | |
19 | * (at your option) any later version. | |
20 | * | |
21 | * This program is distributed in the hope that it will be useful, | |
22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24 | * GNU General Public License for more details. | |
25 | * | |
26 | * You should have received a copy of the GNU General Public License | |
27 | * along with this program; if not, write to the Free Software | |
28 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
29 | * | |
30 | */ | |
d1f14731 | 31 | |
30a4f2a8 | 32 | /* |
33 | * Copyright (c) 1994, 1995. All rights reserved. | |
34 | * | |
35 | * The Harvest software was developed by the Internet Research Task | |
36 | * Force Research Group on Resource Discovery (IRTF-RD): | |
37 | * | |
38 | * Mic Bowman of Transarc Corporation. | |
39 | * Peter Danzig of the University of Southern California. | |
40 | * Darren R. Hardy of the University of Colorado at Boulder. | |
41 | * Udi Manber of the University of Arizona. | |
42 | * Michael F. Schwartz of the University of Colorado at Boulder. | |
43 | * Duane Wessels of the University of Colorado at Boulder. | |
44 | * | |
45 | * This copyright notice applies to software in the Harvest | |
46 | * ``src/'' directory only. Users should consult the individual | |
47 | * copyright notices in the ``components/'' subdirectories for | |
48 | * copyright information about other software bundled with the | |
49 | * Harvest source code distribution. | |
50 | * | |
51 | * TERMS OF USE | |
52 | * | |
53 | * The Harvest software may be used and re-distributed without | |
54 | * charge, provided that the software origin and research team are | |
55 | * cited in any use of the system. Most commonly this is | |
56 | * accomplished by including a link to the Harvest Home Page | |
57 | * (http://harvest.cs.colorado.edu/) from the query page of any | |
58 | * Broker you deploy, as well as in the query result pages. These | |
59 | * links are generated automatically by the standard Broker | |
60 | * software distribution. | |
61 | * | |
62 | * The Harvest software is provided ``as is'', without express or | |
63 | * implied warranty, and with no support nor obligation to assist | |
64 | * in its use, correction, modification or enhancement. We assume | |
65 | * no liability with respect to the infringement of copyrights, | |
66 | * trade secrets, or any patents, and are not responsible for | |
67 | * consequential damages. Proper use of the Harvest software is | |
68 | * entirely the responsibility of the user. | |
69 | * | |
70 | * DERIVATIVE WORKS | |
71 | * | |
72 | * Users may make derivative works from the Harvest software, subject | |
73 | * to the following constraints: | |
74 | * | |
75 | * - You must include the above copyright notice and these | |
76 | * accompanying paragraphs in all forms of derivative works, | |
77 | * and any documentation and other materials related to such | |
78 | * distribution and use acknowledge that the software was | |
79 | * developed at the above institutions. | |
80 | * | |
81 | * - You must notify IRTF-RD regarding your distribution of | |
82 | * the derivative work. | |
83 | * | |
84 | * - You must clearly notify users that your are distributing | |
85 | * a modified version and not the original Harvest software. | |
86 | * | |
87 | * - Any derivative product is also subject to these copyright | |
88 | * and use restrictions. | |
89 | * | |
90 | * Note that the Harvest software is NOT in the public domain. We | |
91 | * retain copyright, as specified above. | |
92 | * | |
93 | * HISTORY OF FREE SOFTWARE STATUS | |
94 | * | |
95 | * Originally we required sites to license the software in cases | |
96 | * where they were going to build commercial products/services | |
97 | * around Harvest. In June 1995 we changed this policy. We now | |
98 | * allow people to use the core Harvest software (the code found in | |
99 | * the Harvest ``src/'' directory) for free. We made this change | |
100 | * in the interest of encouraging the widest possible deployment of | |
101 | * the technology. The Harvest software is really a reference | |
102 | * implementation of a set of protocols and formats, some of which | |
103 | * we intend to standardize. We encourage commercial | |
104 | * re-implementations of code complying to this set of standards. | |
105 | */ | |
090089c4 | 106 | |
44a47c6e | 107 | #include "squid.h" |
0a0bf5db | 108 | #include <errno.h> |
090089c4 | 109 | |
30a4f2a8 | 110 | #ifdef HAVE_NETINET_TCP_H |
111 | #include <netinet/tcp.h> | |
112 | #endif | |
090089c4 | 113 | |
114 | /* Block processing new client requests (accepts on ascii port) when we start | |
115 | * running shy of free file descriptors. For example, under SunOS, we'll keep | |
116 | * 64 file descriptors free for disk-i/o and connections to remote servers */ | |
117 | ||
090089c4 | 118 | #define min(x,y) ((x)<(y)? (x) : (y)) |
119 | #define max(a,b) ((a)>(b)? (a) : (b)) | |
120 | ||
f88211e8 | 121 | typedef struct { |
122 | char *host; | |
123 | u_short port; | |
124 | struct sockaddr_in S; | |
125 | CNCB *callback; | |
126 | void *data; | |
127 | int tries; | |
128 | struct in_addr in_addr; | |
129 | int locks; | |
03a1ee42 | 130 | int fd; |
f88211e8 | 131 | } ConnectStateData; |
132 | ||
090089c4 | 133 | /* STATIC */ |
0b2db32c | 134 | static int polledinc = 0; |
24382924 | 135 | static int commBind _PARAMS((int s, struct in_addr, u_short port)); |
f88211e8 | 136 | #if !HAVE_POLL |
5742d7c9 | 137 | static int examine_select _PARAMS((fd_set *, fd_set *)); |
dcfe6390 | 138 | #endif |
67508012 | 139 | static void checkTimeouts _PARAMS((void)); |
67508012 | 140 | static void commSetReuseAddr _PARAMS((int)); |
67508012 | 141 | static void commSetNoLinger _PARAMS((int)); |
812ed90c | 142 | #if HAVE_POLL |
143 | static void comm_poll_incoming _PARAMS((void)); | |
144 | #else | |
67508012 | 145 | static void comm_select_incoming _PARAMS((void)); |
812ed90c | 146 | #endif |
f17936ab | 147 | static void CommWriteStateCallbackAndFree _PARAMS((int fd, int code)); |
30a4f2a8 | 148 | #ifdef TCP_NODELAY |
67508012 | 149 | static void commSetTcpNoDelay _PARAMS((int)); |
30a4f2a8 | 150 | #endif |
67508012 | 151 | static void commSetTcpRcvbuf _PARAMS((int, int)); |
f88211e8 | 152 | static PF commConnectFree; |
03a1ee42 | 153 | static PF commConnectHandle; |
154 | static PF commHandleWrite; | |
812ed90c | 155 | static int fdIsHttpOrIcp _PARAMS((int fd)); |
edeb28fd | 156 | static IPH commConnectDnsHandle; |
03a1ee42 | 157 | static void commConnectCallback _PARAMS((ConnectStateData * cs, int status)); |
da2b3a17 | 158 | static int commDeferRead(int fd); |
26a880e2 | 159 | static int ignoreErrno(int errno); |
30a4f2a8 | 160 | |
30a4f2a8 | 161 | static struct timeval zero_tv; |
090089c4 | 162 | |
b8d8561b | 163 | static void |
f17936ab | 164 | CommWriteStateCallbackAndFree(int fd, int code) |
9864ee44 | 165 | { |
f17936ab | 166 | CommWriteStateData *CommWriteState = fd_table[fd].rwstate; |
167 | CWCB *callback = NULL; | |
1a8f5ed6 | 168 | void *data; |
a56a3abe | 169 | fd_table[fd].rwstate = NULL; |
f17936ab | 170 | if (CommWriteState == NULL) |
9864ee44 | 171 | return; |
f17936ab | 172 | if (CommWriteState->free) { |
173 | CommWriteState->free(CommWriteState->buf); | |
174 | CommWriteState->buf = NULL; | |
9864ee44 | 175 | } |
f17936ab | 176 | callback = CommWriteState->handler; |
1a8f5ed6 | 177 | data = CommWriteState->handler_data; |
f17936ab | 178 | CommWriteState->handler = NULL; |
1a8f5ed6 | 179 | if (callback && cbdataValid(data)) |
180 | callback(fd, CommWriteState->buf, CommWriteState->offset, code, data); | |
181 | cbdataUnlock(data); | |
f17936ab | 182 | safe_free(CommWriteState); |
9864ee44 | 183 | } |
184 | ||
090089c4 | 185 | /* Return the local port associated with fd. */ |
b8d8561b | 186 | u_short |
187 | comm_local_port(int fd) | |
090089c4 | 188 | { |
189 | struct sockaddr_in addr; | |
190 | int addr_len = 0; | |
76f87348 | 191 | fde *F = &fd_table[fd]; |
090089c4 | 192 | |
090089c4 | 193 | /* If the fd is closed already, just return */ |
76f87348 | 194 | if (!F->open) { |
a3d5953d | 195 | debug(5, 0) ("comm_local_port: FD %d has been closed.\n", fd); |
30a4f2a8 | 196 | return 0; |
090089c4 | 197 | } |
76f87348 | 198 | if (F->local_port) |
199 | return F->local_port; | |
090089c4 | 200 | addr_len = sizeof(addr); |
201 | if (getsockname(fd, (struct sockaddr *) &addr, &addr_len)) { | |
a3d5953d | 202 | debug(50, 1) ("comm_local_port: Failed to retrieve TCP/UDP port number for socket: FD %d: %s\n", fd, xstrerror()); |
30a4f2a8 | 203 | return 0; |
090089c4 | 204 | } |
a3d5953d | 205 | debug(5, 6) ("comm_local_port: FD %d: sockaddr %u.\n", fd, addr.sin_addr.s_addr); |
76f87348 | 206 | F->local_port = ntohs(addr.sin_port); |
207 | return F->local_port; | |
090089c4 | 208 | } |
209 | ||
b8d8561b | 210 | static int |
211 | commBind(int s, struct in_addr in_addr, u_short port) | |
090089c4 | 212 | { |
213 | struct sockaddr_in S; | |
090089c4 | 214 | |
090089c4 | 215 | memset(&S, '\0', sizeof(S)); |
216 | S.sin_family = AF_INET; | |
217 | S.sin_port = htons(port); | |
30a4f2a8 | 218 | S.sin_addr = in_addr; |
090089c4 | 219 | if (bind(s, (struct sockaddr *) &S, sizeof(S)) == 0) |
220 | return COMM_OK; | |
a3d5953d | 221 | debug(50, 0) ("commBind: Cannot bind socket FD %d to %s:%d: %s\n", |
090089c4 | 222 | s, |
30a4f2a8 | 223 | S.sin_addr.s_addr == INADDR_ANY ? "*" : inet_ntoa(S.sin_addr), |
44a62238 | 224 | (int) port, |
225 | xstrerror()); | |
090089c4 | 226 | return COMM_ERROR; |
227 | } | |
228 | ||
229 | /* Create a socket. Default is blocking, stream (TCP) socket. IO_TYPE | |
230 | * is OR of flags specified in comm.h. */ | |
b8d8561b | 231 | int |
16b204c4 | 232 | comm_open(int sock_type, |
cc6a9d2e | 233 | int proto, |
234 | struct in_addr addr, | |
235 | u_short port, | |
236 | int flags, | |
0ee4272b | 237 | const char *note) |
090089c4 | 238 | { |
239 | int new_socket; | |
76f87348 | 240 | fde *F = NULL; |
b6f794d6 | 241 | int tcp_rcv_bufsz = Config.tcpRcvBufsz; |
090089c4 | 242 | |
243 | /* Create socket for accepting new connections. */ | |
16b204c4 | 244 | if ((new_socket = socket(AF_INET, sock_type, proto)) < 0) { |
090089c4 | 245 | /* Increase the number of reserved fd's if calls to socket() |
246 | * are failing because the open file table is full. This | |
247 | * limits the number of simultaneous clients */ | |
248 | switch (errno) { | |
249 | case ENFILE: | |
250 | case EMFILE: | |
a3d5953d | 251 | debug(50, 1) ("comm_open: socket failure: %s\n", xstrerror()); |
090089c4 | 252 | break; |
253 | default: | |
a3d5953d | 254 | debug(50, 0) ("comm_open: socket failure: %s\n", xstrerror()); |
090089c4 | 255 | } |
603a02fd | 256 | return -1; |
090089c4 | 257 | } |
258 | /* update fdstat */ | |
365e5b34 | 259 | debug(5, 5) ("comm_open: FD %d is a new socket\n", new_socket); |
5c5783a2 | 260 | fd_open(new_socket, FD_SOCKET, note); |
76f87348 | 261 | F = &fd_table[new_socket]; |
16b204c4 | 262 | if (!BIT_TEST(flags, COMM_NOCLOEXEC)) |
3ca60c86 | 263 | commSetCloseOnExec(new_socket); |
7690e8eb | 264 | if (port > (u_short) 0) { |
30a4f2a8 | 265 | commSetNoLinger(new_socket); |
266 | if (do_reuse) | |
090089c4 | 267 | commSetReuseAddr(new_socket); |
090089c4 | 268 | } |
a3724d50 | 269 | if (addr.s_addr != no_addr.s_addr) { |
270 | if (commBind(new_socket, addr, port) != COMM_OK) { | |
271 | comm_close(new_socket); | |
603a02fd | 272 | return -1; |
a3724d50 | 273 | } |
23ff6968 | 274 | } |
76f87348 | 275 | F->local_port = port; |
090089c4 | 276 | |
16b204c4 | 277 | if (BIT_TEST(flags, COMM_NONBLOCKING)) |
30a4f2a8 | 278 | if (commSetNonBlocking(new_socket) == COMM_ERROR) |
603a02fd | 279 | return -1; |
30a4f2a8 | 280 | #ifdef TCP_NODELAY |
281 | if (sock_type == SOCK_STREAM) | |
282 | commSetTcpNoDelay(new_socket); | |
283 | #endif | |
f868539a | 284 | if (tcp_rcv_bufsz > 0 && sock_type == SOCK_STREAM) |
285 | commSetTcpRcvbuf(new_socket, tcp_rcv_bufsz); | |
090089c4 | 286 | return new_socket; |
287 | } | |
288 | ||
289 | /* | |
e83892e9 | 290 | * NOTE: set the listen queue to Squid_MaxFD/4 and rely on the kernel to |
090089c4 | 291 | * impose an upper limit. Solaris' listen(3n) page says it has |
292 | * no limit on this parameter, but sys/socket.h sets SOMAXCONN | |
293 | * to 5. HP-UX currently has a limit of 20. SunOS is 5 and | |
294 | * OSF 3.0 is 8. | |
295 | */ | |
b8d8561b | 296 | int |
297 | comm_listen(int sock) | |
090089c4 | 298 | { |
299 | int x; | |
e83892e9 | 300 | if ((x = listen(sock, Squid_MaxFD >> 2)) < 0) { |
a3d5953d | 301 | debug(50, 0) ("comm_listen: listen(%d, %d): %s\n", |
e83892e9 | 302 | Squid_MaxFD >> 2, |
090089c4 | 303 | sock, xstrerror()); |
304 | return x; | |
305 | } | |
306 | return sock; | |
307 | } | |
308 | ||
e5f6c5c2 | 309 | void |
4f92c80c | 310 | commConnectStart(int fd, const char *host, u_short port, CNCB * callback, void *data) |
e924600d | 311 | { |
312 | ConnectStateData *cs = xcalloc(1, sizeof(ConnectStateData)); | |
8407afee | 313 | cbdataAdd(cs); |
03a1ee42 | 314 | cs->fd = fd; |
e924600d | 315 | cs->host = xstrdup(host); |
316 | cs->port = port; | |
317 | cs->callback = callback; | |
318 | cs->data = data; | |
b716a8ad | 319 | cbdataLock(cs->data); |
e924600d | 320 | comm_add_close_handler(fd, commConnectFree, cs); |
f88211e8 | 321 | cs->locks++; |
8407afee | 322 | ipcache_nbgethostbyname(host, commConnectDnsHandle, cs); |
edeb28fd | 323 | } |
324 | ||
325 | static void | |
03a1ee42 | 326 | commConnectDnsHandle(const ipcache_addrs * ia, void *data) |
edeb28fd | 327 | { |
328 | ConnectStateData *cs = data; | |
f88211e8 | 329 | assert(cs->locks == 1); |
330 | cs->locks--; | |
edeb28fd | 331 | if (ia == NULL) { |
a3d5953d | 332 | debug(5, 3) ("commConnectDnsHandle: Unknown host: %s\n", cs->host); |
03a1ee42 | 333 | commConnectCallback(cs, COMM_ERR_DNS); |
edeb28fd | 334 | return; |
335 | } | |
f076b37b | 336 | assert(ia->cur < ia->count); |
edeb28fd | 337 | cs->in_addr = ia->in_addrs[ia->cur]; |
03a1ee42 | 338 | commConnectHandle(cs->fd, cs); |
e924600d | 339 | } |
340 | ||
f88211e8 | 341 | static void |
03a1ee42 | 342 | commConnectCallback(ConnectStateData * cs, int status) |
f88211e8 | 343 | { |
a3d5953d | 344 | CNCB *callback = cs->callback; |
345 | void *data = cs->data; | |
03a1ee42 | 346 | int fd = cs->fd; |
a3d5953d | 347 | comm_remove_close_handler(fd, commConnectFree, cs); |
348 | commConnectFree(fd, cs); | |
8407afee | 349 | if (cbdataValid(data)) |
365e5b34 | 350 | callback(fd, status, data); |
b716a8ad | 351 | cbdataUnlock(cs->data); |
f88211e8 | 352 | } |
353 | ||
e924600d | 354 | static void |
03a1ee42 | 355 | commConnectFree(int fdunused, void *data) |
e924600d | 356 | { |
357 | ConnectStateData *cs = data; | |
8407afee | 358 | if (cs->locks) |
365e5b34 | 359 | ipcacheUnregister(cs->host, cs); |
8407afee | 360 | safe_free(cs->host); |
361 | cbdataFree(cs); | |
e924600d | 362 | } |
363 | ||
edeb28fd | 364 | static int |
f88211e8 | 365 | commRetryConnect(int fd, ConnectStateData * cs) |
edeb28fd | 366 | { |
367 | int fd2; | |
f88211e8 | 368 | if (++cs->tries == 4) |
edeb28fd | 369 | return 0; |
7dd44885 | 370 | if (!cbdataValid(cs->data)) |
371 | return 0; | |
edeb28fd | 372 | fd2 = socket(AF_INET, SOCK_STREAM, 0); |
373 | if (fd2 < 0) { | |
a3d5953d | 374 | debug(5, 0) ("commRetryConnect: socket: %s\n", xstrerror()); |
edeb28fd | 375 | return 0; |
376 | } | |
377 | if (dup2(fd2, fd) < 0) { | |
a3d5953d | 378 | debug(5, 0) ("commRetryConnect: dup2: %s\n", xstrerror()); |
edeb28fd | 379 | return 0; |
380 | } | |
381 | commSetNonBlocking(fd); | |
382 | close(fd2); | |
383 | return 1; | |
384 | } | |
385 | ||
e924600d | 386 | /* Connect SOCK to specified DEST_PORT at DEST_HOST. */ |
387 | static void | |
388 | commConnectHandle(int fd, void *data) | |
090089c4 | 389 | { |
f88211e8 | 390 | ConnectStateData *cs = data; |
391 | if (cs->S.sin_addr.s_addr == 0) { | |
392 | cs->S.sin_family = AF_INET; | |
393 | cs->S.sin_addr = cs->in_addr; | |
394 | cs->S.sin_port = htons(cs->port); | |
17a0a4ee | 395 | if (Config.onoff.log_fqdn) |
f88211e8 | 396 | fqdncache_gethostbyaddr(cs->S.sin_addr, FQDN_LOOKUP_IF_MISS); |
e5f6c5c2 | 397 | } |
f88211e8 | 398 | switch (comm_connect_addr(fd, &cs->S)) { |
e5f6c5c2 | 399 | case COMM_INPROGRESS: |
489b22c1 | 400 | debug(5, 5) ("FD %d: COMM_INPROGRESS\n", fd); |
f88211e8 | 401 | commSetSelect(fd, COMM_SELECT_WRITE, commConnectHandle, cs, 0); |
e5f6c5c2 | 402 | break; |
403 | case COMM_OK: | |
f88211e8 | 404 | ipcacheCycleAddr(cs->host); |
03a1ee42 | 405 | commConnectCallback(cs, COMM_OK); |
e5f6c5c2 | 406 | break; |
407 | default: | |
f88211e8 | 408 | if (commRetryConnect(fd, cs)) { |
0b6647bb | 409 | debug(5, 2) ("Retrying connection to %s: %s\n", |
f88211e8 | 410 | cs->host, xstrerror()); |
411 | cs->S.sin_addr.s_addr = 0; | |
412 | ipcacheCycleAddr(cs->host); | |
413 | cs->locks++; | |
8407afee | 414 | ipcache_nbgethostbyname(cs->host, commConnectDnsHandle, cs); |
edeb28fd | 415 | } else { |
f88211e8 | 416 | ipcacheRemoveBadAddr(cs->host, cs->S.sin_addr); |
03a1ee42 | 417 | commConnectCallback(cs, COMM_ERR_CONNECT); |
edeb28fd | 418 | } |
e5f6c5c2 | 419 | break; |
090089c4 | 420 | } |
090089c4 | 421 | } |
b8d8561b | 422 | int |
4f92c80c | 423 | commSetTimeout(int fd, int timeout, PF * handler, void *data) |
090089c4 | 424 | { |
76f87348 | 425 | fde *F; |
a3d5953d | 426 | debug(5, 3) ("commSetTimeout: FD %d timeout %d\n", fd, timeout); |
03eb2f01 | 427 | assert(fd >= 0); |
428 | assert(fd < Squid_MaxFD); | |
76f87348 | 429 | F = &fd_table[fd]; |
5c5783a2 | 430 | if (timeout < 0) { |
76f87348 | 431 | F->timeout_handler = NULL; |
432 | F->timeout_data = NULL; | |
433 | return F->timeout = 0; | |
5c5783a2 | 434 | } |
bbdb774b | 435 | if (shutdown_pending || reconfigure_pending) { |
4f92c80c | 436 | /* don't increase the timeout if something pending */ |
76f87348 | 437 | if (F->timeout > 0 && (int) (F->timeout - squid_curtime) < timeout) |
438 | return F->timeout; | |
5c5783a2 | 439 | } |
76f87348 | 440 | assert(handler || F->timeout_handler); |
5c5783a2 | 441 | if (handler || data) { |
76f87348 | 442 | F->timeout_handler = handler; |
443 | F->timeout_data = data; | |
30a4f2a8 | 444 | } |
76f87348 | 445 | return F->timeout = squid_curtime + (time_t) timeout; |
090089c4 | 446 | } |
447 | ||
b8d8561b | 448 | int |
0ee4272b | 449 | comm_connect_addr(int sock, const struct sockaddr_in *address) |
090089c4 | 450 | { |
451 | int status = COMM_OK; | |
76f87348 | 452 | fde *F = &fd_table[sock]; |
090089c4 | 453 | int len; |
454 | int x; | |
489b22c1 | 455 | assert(ntohs(address->sin_port) != 0); |
090089c4 | 456 | /* Establish connection. */ |
086bce16 | 457 | if (connect(sock, (struct sockaddr *) address, sizeof(struct sockaddr_in)) < 0) { |
365e5b34 | 458 | debug(5, 9) ("connect FD %d: %s\n", sock, xstrerror()); |
090089c4 | 459 | switch (errno) { |
460 | case EALREADY: | |
30a4f2a8 | 461 | #if EAGAIN != EWOULDBLOCK |
462 | case EAGAIN: | |
463 | #endif | |
0a0bf5db | 464 | case EINTR: |
30a4f2a8 | 465 | case EWOULDBLOCK: |
090089c4 | 466 | case EINPROGRESS: |
e5f6c5c2 | 467 | status = COMM_INPROGRESS; |
090089c4 | 468 | break; |
469 | case EISCONN: | |
470 | status = COMM_OK; | |
471 | break; | |
472 | case EINVAL: | |
473 | len = sizeof(x); | |
474 | if (getsockopt(sock, SOL_SOCKET, SO_ERROR, (char *) &x, &len) >= 0) | |
475 | errno = x; | |
476 | default: | |
a3d5953d | 477 | debug(50, 2) ("connect: %s:%d: %s.\n", |
28ab0c0a | 478 | fqdnFromAddr(address->sin_addr), |
090089c4 | 479 | ntohs(address->sin_port), |
480 | xstrerror()); | |
481 | return COMM_ERROR; | |
482 | } | |
e5f6c5c2 | 483 | } |
76f87348 | 484 | xstrncpy(F->ipaddr, inet_ntoa(address->sin_addr), 16); |
485 | F->remote_port = ntohs(address->sin_port); | |
090089c4 | 486 | if (status == COMM_OK) { |
a3d5953d | 487 | debug(5, 10) ("comm_connect_addr: FD %d connected to %s:%d\n", |
76f87348 | 488 | sock, F->ipaddr, F->remote_port); |
f21cd581 | 489 | } else if (status == COMM_INPROGRESS) { |
a3d5953d | 490 | debug(5, 10) ("comm_connect_addr: FD %d connection pending\n", sock); |
090089c4 | 491 | } |
492 | /* Add new socket to list of open sockets. */ | |
090089c4 | 493 | return status; |
494 | } | |
495 | ||
496 | /* Wait for an incoming connection on FD. FD should be a socket returned | |
497 | * from comm_listen. */ | |
b8d8561b | 498 | int |
499 | comm_accept(int fd, struct sockaddr_in *peer, struct sockaddr_in *me) | |
090089c4 | 500 | { |
501 | int sock; | |
1f9afe33 | 502 | struct sockaddr_in P; |
503 | struct sockaddr_in M; | |
090089c4 | 504 | int Slen; |
76f87348 | 505 | fde *F = NULL; |
090089c4 | 506 | |
1f9afe33 | 507 | Slen = sizeof(P); |
508 | while ((sock = accept(fd, (struct sockaddr *) &P, &Slen)) < 0) { | |
090089c4 | 509 | switch (errno) { |
510 | #if EAGAIN != EWOULDBLOCK | |
511 | case EAGAIN: | |
512 | #endif | |
513 | case EWOULDBLOCK: | |
090089c4 | 514 | case EINTR: |
0a0bf5db | 515 | return COMM_NOMESSAGE; |
090089c4 | 516 | case ENFILE: |
517 | case EMFILE: | |
090089c4 | 518 | return COMM_ERROR; |
519 | default: | |
a3d5953d | 520 | debug(50, 1) ("comm_accept: FD %d: accept failure: %s\n", |
090089c4 | 521 | fd, xstrerror()); |
522 | return COMM_ERROR; | |
523 | } | |
524 | } | |
525 | ||
526 | if (peer) | |
1f9afe33 | 527 | *peer = P; |
4053a845 | 528 | Slen = sizeof(M); |
529 | memset(&M, '\0', Slen); | |
530 | getsockname(sock, (struct sockaddr *) &M, &Slen); | |
531 | if (me) | |
1f9afe33 | 532 | *me = M; |
3ca60c86 | 533 | commSetCloseOnExec(sock); |
090089c4 | 534 | /* fdstat update */ |
5c5783a2 | 535 | fd_open(sock, FD_SOCKET, "HTTP Request"); |
76f87348 | 536 | F = &fd_table[sock]; |
537 | strcpy(F->ipaddr, inet_ntoa(P.sin_addr)); | |
538 | F->remote_port = htons(P.sin_port); | |
539 | F->local_port = htons(M.sin_port); | |
090089c4 | 540 | commSetNonBlocking(sock); |
090089c4 | 541 | return sock; |
542 | } | |
543 | ||
cb201b7e | 544 | void |
545 | commCallCloseHandlers(int fd) | |
546 | { | |
76f87348 | 547 | fde *F = &fd_table[fd]; |
f1dc9b30 | 548 | close_handler *ch; |
a3d5953d | 549 | debug(5, 5) ("commCallCloseHandlers: FD %d\n", fd); |
76f87348 | 550 | while ((ch = F->close_handler) != NULL) { |
551 | F->close_handler = ch->next; | |
603a02fd | 552 | if (cbdataValid(ch->data)) |
553 | ch->handler(fd, ch->data); | |
554 | cbdataUnlock(ch->data); | |
cb201b7e | 555 | safe_free(ch); |
556 | } | |
557 | } | |
558 | ||
b8d8561b | 559 | void |
560 | comm_close(int fd) | |
090089c4 | 561 | { |
76f87348 | 562 | fde *F = NULL; |
a3d5953d | 563 | debug(5, 5) ("comm_close: FD %d\n", fd); |
03eb2f01 | 564 | assert(fd >= 0); |
565 | assert(fd < Squid_MaxFD); | |
76f87348 | 566 | F = &fd_table[fd]; |
e102ebda | 567 | if (BIT_TEST(F->flags, FD_CLOSING)) |
568 | return; | |
b716a8ad | 569 | assert(F->open); |
76f87348 | 570 | assert(F->type != FD_FILE); |
e102ebda | 571 | BIT_SET(F->flags, FD_CLOSING); |
f17936ab | 572 | CommWriteStateCallbackAndFree(fd, COMM_ERROR); |
cb201b7e | 573 | commCallCloseHandlers(fd); |
b716a8ad | 574 | if (F->uses) /* assume persistent connect count */ |
575 | pconnHistCount(1, F->uses); | |
5c5783a2 | 576 | fd_close(fd); /* update fdstat */ |
0a0bf5db | 577 | #if USE_ASYNC_IO |
578 | aioClose(fd); | |
579 | #else | |
9864ee44 | 580 | close(fd); |
0a0bf5db | 581 | #endif |
090089c4 | 582 | } |
583 | ||
090089c4 | 584 | |
585 | /* Send a udp datagram to specified PORT at HOST. */ | |
b8d8561b | 586 | int |
0ee4272b | 587 | comm_udp_send(int fd, const char *host, u_short port, const char *buf, int len) |
090089c4 | 588 | { |
0ee4272b | 589 | const ipcache_addrs *ia = NULL; |
090089c4 | 590 | static struct sockaddr_in to_addr; |
591 | int bytes_sent; | |
592 | ||
593 | /* Set up the destination socket address for message to send to. */ | |
594 | to_addr.sin_family = AF_INET; | |
595 | ||
e5f6c5c2 | 596 | if ((ia = ipcache_gethostbyname(host, IP_BLOCKING_LOOKUP)) == 0) { |
a3d5953d | 597 | debug(50, 1) ("comm_udp_send: gethostbyname failure: %s: %s\n", |
090089c4 | 598 | host, xstrerror()); |
599 | return (COMM_ERROR); | |
600 | } | |
e5f6c5c2 | 601 | to_addr.sin_addr = ia->in_addrs[ia->cur]; |
090089c4 | 602 | to_addr.sin_port = htons(port); |
603 | if ((bytes_sent = sendto(fd, buf, len, 0, (struct sockaddr *) &to_addr, | |
604 | sizeof(to_addr))) < 0) { | |
a3d5953d | 605 | debug(50, 1) ("comm_udp_send: sendto failure: FD %d: %s\n", |
090089c4 | 606 | fd, xstrerror()); |
607 | return COMM_ERROR; | |
608 | } | |
609 | return bytes_sent; | |
610 | } | |
611 | ||
612 | /* Send a udp datagram to specified TO_ADDR. */ | |
b8d8561b | 613 | int |
5df61230 | 614 | comm_udp_sendto(int fd, |
615 | const struct sockaddr_in *to_addr, | |
616 | int addr_len, | |
617 | const char *buf, | |
618 | int len) | |
090089c4 | 619 | { |
5df61230 | 620 | int x; |
621 | x = sendto(fd, buf, len, 0, (struct sockaddr *) to_addr, addr_len); | |
622 | if (x < 0) { | |
a3d5953d | 623 | debug(50, 1) ("comm_udp_sendto: FD %d, %s, port %d: %s\n", |
5df61230 | 624 | fd, |
625 | inet_ntoa(to_addr->sin_addr), | |
626 | (int) htons(to_addr->sin_port), | |
627 | xstrerror()); | |
090089c4 | 628 | return COMM_ERROR; |
629 | } | |
5df61230 | 630 | return x; |
090089c4 | 631 | } |
632 | ||
b8d8561b | 633 | void |
70a9dab4 | 634 | commSetDefer(int fd, DEFER * func, void *data) |
4883993a | 635 | { |
da2b3a17 | 636 | fde *F = &fd_table[fd]; |
637 | F->defer_check = func; | |
70a9dab4 | 638 | F->defer_data = data; |
4883993a | 639 | } |
640 | ||
da2b3a17 | 641 | static int |
642 | commDeferRead(int fd) | |
643 | { | |
644 | fde *F = &fd_table[fd]; | |
645 | if (F->defer_check == NULL) | |
646 | return 0; | |
70a9dab4 | 647 | return F->defer_check(fd, F->defer_data); |
da2b3a17 | 648 | } |
dcfe6390 | 649 | |
f88211e8 | 650 | #if HAVE_POLL |
dcfe6390 | 651 | |
652 | /* poll() version by: | |
653 | * Stewart Forster <slf@connect.com.au>, and | |
654 | * Anthony Baxter <arb@connect.com.au> */ | |
655 | ||
656 | static void | |
812ed90c | 657 | comm_poll_incoming(void) |
dcfe6390 | 658 | { |
429fdbec | 659 | int fd; |
996a0a51 | 660 | int fds[4]; |
0b2421ea | 661 | struct pollfd pfds[3 + MAXHTTPPORTS]; |
996a0a51 | 662 | unsigned long N = 0; |
429fdbec | 663 | unsigned long i, nfds; |
812ed90c | 664 | int j; |
582b6456 | 665 | PF *hdl = NULL; |
97c03d3c | 666 | polledinc = 0; |
dcfe6390 | 667 | if (theInIcpConnection >= 0) |
668 | fds[N++] = theInIcpConnection; | |
933c6d93 | 669 | if (theInIcpConnection != theOutIcpConnection) |
1793867a | 670 | if (theOutIcpConnection >= 0) |
933c6d93 | 671 | fds[N++] = theOutIcpConnection; |
0b2421ea | 672 | for (j = 0; j < NHttpSockets; j++) { |
812ed90c | 673 | if (HttpSockets[j] < 0) |
0b2421ea | 674 | continue; |
da2b3a17 | 675 | if (commDeferRead(HttpSockets[j])) |
0b2421ea | 676 | continue; |
812ed90c | 677 | fds[N++] = HttpSockets[j]; |
678 | } | |
429fdbec | 679 | for (i = nfds = 0; i < N; i++) { |
680 | int events; | |
dcfe6390 | 681 | fd = fds[i]; |
429fdbec | 682 | events = 0; |
683 | if (fd_table[fd].read_handler) | |
684 | events |= POLLRDNORM; | |
685 | if (fd_table[fd].write_handler) | |
686 | events |= POLLWRNORM; | |
687 | if (events) { | |
688 | pfds[nfds].fd = fd; | |
689 | pfds[nfds].events = events; | |
690 | pfds[nfds].revents = 0; | |
691 | nfds++; | |
dcfe6390 | 692 | } |
dcfe6390 | 693 | } |
429fdbec | 694 | if (!nfds) |
695 | return; | |
97c03d3c | 696 | polledinc = poll(pfds, nfds, 0); |
697 | if (polledinc < 1) { | |
698 | polledinc = 0; | |
996a0a51 | 699 | return; |
97c03d3c | 700 | } |
429fdbec | 701 | for (i = 0; i < nfds; i++) { |
702 | int revents; | |
703 | if (((revents = pfds[i].revents) == 0) || ((fd = pfds[i].fd) == -1)) | |
dcfe6390 | 704 | continue; |
429fdbec | 705 | if (revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR)) { |
706 | hdl = fd_table[fd].read_handler; | |
76f87348 | 707 | fd_table[fd].read_handler = NULL; |
429fdbec | 708 | hdl(fd, fd_table[fd].read_data); |
dcfe6390 | 709 | } |
429fdbec | 710 | if (revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR)) { |
711 | hdl = fd_table[fd].write_handler; | |
76f87348 | 712 | fd_table[fd].write_handler = NULL; |
429fdbec | 713 | hdl(fd, fd_table[fd].write_data); |
dcfe6390 | 714 | } |
715 | } | |
716 | /* TO FIX: repoll ICP connection here */ | |
717 | } | |
718 | ||
ca98227c | 719 | #else |
dcfe6390 | 720 | |
b8d8561b | 721 | static void |
0673c0ba | 722 | comm_select_incoming(void) |
055f4d4d | 723 | { |
724 | fd_set read_mask; | |
725 | fd_set write_mask; | |
726 | int maxfd = 0; | |
727 | int fd = 0; | |
0b2421ea | 728 | int fds[3 + MAXHTTPPORTS]; |
055f4d4d | 729 | int N = 0; |
730 | int i = 0; | |
582b6456 | 731 | PF *hdl = NULL; |
97c03d3c | 732 | polledinc = 0; |
055f4d4d | 733 | FD_ZERO(&read_mask); |
734 | FD_ZERO(&write_mask); | |
0b2421ea | 735 | for (i = 0; i < NHttpSockets; i++) { |
812ed90c | 736 | if (HttpSockets[i] < 0) |
0b2421ea | 737 | continue; |
da2b3a17 | 738 | if (commDeferRead(HttpSockets[i])) |
0b2421ea | 739 | continue; |
812ed90c | 740 | fds[N++] = HttpSockets[i]; |
741 | } | |
30a4f2a8 | 742 | if (theInIcpConnection >= 0) |
743 | fds[N++] = theInIcpConnection; | |
933c6d93 | 744 | if (theInIcpConnection != theOutIcpConnection) |
745 | if (theOutIcpConnection >= 0) | |
746 | fds[N++] = theOutIcpConnection; | |
055f4d4d | 747 | fds[N++] = 0; |
055f4d4d | 748 | for (i = 0; i < N; i++) { |
749 | fd = fds[i]; | |
750 | if (fd_table[fd].read_handler) { | |
751 | FD_SET(fd, &read_mask); | |
752 | if (fd > maxfd) | |
753 | maxfd = fd; | |
754 | } | |
755 | if (fd_table[fd].write_handler) { | |
756 | FD_SET(fd, &write_mask); | |
757 | if (fd > maxfd) | |
758 | maxfd = fd; | |
759 | } | |
760 | } | |
055f4d4d | 761 | if (maxfd++ == 0) |
762 | return; | |
97c03d3c | 763 | polledinc = select(maxfd, &read_mask, &write_mask, NULL, &zero_tv); |
764 | if (polledinc < 1) { | |
765 | polledinc = 0; | |
dcfe6390 | 766 | return; |
97c03d3c | 767 | } |
dcfe6390 | 768 | for (i = 0; i < N; i++) { |
769 | fd = fds[i]; | |
770 | if (FD_ISSET(fd, &read_mask)) { | |
771 | hdl = fd_table[fd].read_handler; | |
76f87348 | 772 | fd_table[fd].read_handler = NULL; |
dcfe6390 | 773 | hdl(fd, fd_table[fd].read_data); |
774 | } | |
775 | if (FD_ISSET(fd, &write_mask)) { | |
776 | hdl = fd_table[fd].write_handler; | |
76f87348 | 777 | fd_table[fd].write_handler = NULL; |
dcfe6390 | 778 | hdl(fd, fd_table[fd].write_data); |
779 | } | |
780 | } | |
781 | } | |
782 | #endif | |
783 | ||
812ed90c | 784 | static int |
785 | fdIsHttpOrIcp(int fd) | |
786 | { | |
787 | int j; | |
788 | if (fd == theInIcpConnection) | |
789 | return 1; | |
790 | if (fd == theOutIcpConnection) | |
791 | return 1; | |
792 | for (j = 0; j < NHttpSockets; j++) { | |
793 | if (fd == HttpSockets[j]) | |
794 | return 1; | |
795 | } | |
796 | return 0; | |
797 | } | |
798 | ||
f88211e8 | 799 | #if HAVE_POLL |
dcfe6390 | 800 | /* poll all sockets; call handlers for those that are ready. */ |
801 | int | |
812ed90c | 802 | comm_poll(time_t sec) |
dcfe6390 | 803 | { |
0a0bf5db | 804 | struct pollfd pfds[SQUID_MAXFD]; |
582b6456 | 805 | PF *hdl = NULL; |
dcfe6390 | 806 | int fd; |
807 | int i; | |
808 | int maxfd; | |
996a0a51 | 809 | unsigned long nfds; |
dcfe6390 | 810 | int num; |
dcfe6390 | 811 | static time_t last_timeout = 0; |
97c03d3c | 812 | static int lastinc = 0; |
429fdbec | 813 | int poll_time; |
812ed90c | 814 | static int incoming_counter = 0; |
dcfe6390 | 815 | time_t timeout; |
dcfe6390 | 816 | /* assume all process are very fast (less than 1 second). Call |
817 | * time() only once */ | |
dcfe6390 | 818 | /* use only 1 second granularity */ |
819 | timeout = squid_curtime + sec; | |
820 | do { | |
bbdb774b | 821 | if (shutdown_pending || reconfigure_pending) { |
dcfe6390 | 822 | serverConnectionsClose(); |
dcfe6390 | 823 | dnsShutdownServers(); |
824 | redirectShutdownServers(); | |
429fdbec | 825 | /* shutdown_pending will be set to |
826 | * +1 for SIGTERM | |
827 | * -1 for SIGINT */ | |
bbdb774b | 828 | /* reconfigure_pending always == 1 when SIGHUP received */ |
829 | if (shutdown_pending > 0 || reconfigure_pending > 0) | |
5c5783a2 | 830 | setSocketShutdownLifetimes(Config.shutdownLifetime); |
dcfe6390 | 831 | else |
9e4ad609 | 832 | setSocketShutdownLifetimes(1); |
dcfe6390 | 833 | } |
429fdbec | 834 | nfds = 0; |
835 | maxfd = Biggest_FD + 1; | |
429fdbec | 836 | for (i = 0; i < maxfd; i++) { |
837 | int events; | |
838 | events = 0; | |
dcfe6390 | 839 | /* Check each open socket for a handler. */ |
da2b3a17 | 840 | if (fd_table[i].read_handler && !commDeferRead(i)) |
429fdbec | 841 | events |= POLLRDNORM; |
842 | if (fd_table[i].write_handler) | |
843 | events |= POLLWRNORM; | |
844 | if (events) { | |
429fdbec | 845 | pfds[nfds].fd = i; |
846 | pfds[nfds].events = events; | |
847 | pfds[nfds].revents = 0; | |
848 | nfds++; | |
055f4d4d | 849 | } |
0b2421ea | 850 | } |
bbdb774b | 851 | if (shutdown_pending || reconfigure_pending) |
a3d5953d | 852 | debug(5, 2) ("comm_poll: Still waiting on %d FDs\n", nfds); |
dcfe6390 | 853 | if (nfds == 0) |
854 | return COMM_SHUTDOWN; | |
76f87348 | 855 | poll_time = sec > 0 ? 1000 : 0; |
0a0bf5db | 856 | #if USE_ASYNC_IO |
857 | aioCheckCallbacks(); | |
858 | #endif | |
dcfe6390 | 859 | for (;;) { |
429fdbec | 860 | num = poll(pfds, nfds, poll_time); |
861 | select_loops++; | |
dcfe6390 | 862 | if (num >= 0) |
863 | break; | |
864 | if (errno == EINTR) | |
0a0bf5db | 865 | continue; |
a3d5953d | 866 | debug(5, 0) ("comm_poll: poll failure: %s\n", xstrerror()); |
03eb2f01 | 867 | assert(errno != EINVAL); |
dcfe6390 | 868 | return COMM_ERROR; |
869 | /* NOTREACHED */ | |
870 | } | |
a3d5953d | 871 | debug(5, num ? 5 : 8) ("comm_poll: %d sockets ready\n", num); |
5c5783a2 | 872 | /* Check timeout handlers ONCE each second. */ |
dcfe6390 | 873 | if (squid_curtime > last_timeout) { |
874 | last_timeout = squid_curtime; | |
875 | checkTimeouts(); | |
dcfe6390 | 876 | } |
877 | if (num == 0) | |
878 | continue; | |
879 | /* scan each socket but the accept socket. Poll this | |
2c5294ce | 880 | * more frequently to minimize losses due to the 5 connect |
dcfe6390 | 881 | * limit in SunOS */ |
429fdbec | 882 | for (i = 0; i < nfds; i++) { |
883 | int revents; | |
884 | if (((revents = pfds[i].revents) == 0) || ((fd = pfds[i].fd) == -1)) | |
dcfe6390 | 885 | continue; |
97c03d3c | 886 | if ((incoming_counter++ & (lastinc > 0 ? 1 : 7)) == 0) |
812ed90c | 887 | comm_poll_incoming(); |
888 | if (fdIsHttpOrIcp(fd)) | |
996a0a51 | 889 | continue; |
429fdbec | 890 | if (revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR)) { |
a3d5953d | 891 | debug(5, 6) ("comm_poll: FD %d ready for reading\n", fd); |
0b2421ea | 892 | if ((hdl = fd_table[fd].read_handler)) { |
76f87348 | 893 | fd_table[fd].read_handler = NULL; |
0b2421ea | 894 | hdl(fd, fd_table[fd].read_data); |
895 | } | |
dcfe6390 | 896 | } |
429fdbec | 897 | if (revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR)) { |
a3d5953d | 898 | debug(5, 5) ("comm_poll: FD %d ready for writing\n", fd); |
0b2421ea | 899 | if ((hdl = fd_table[fd].write_handler)) { |
76f87348 | 900 | fd_table[fd].write_handler = NULL; |
0b2421ea | 901 | hdl(fd, fd_table[fd].write_data); |
902 | } | |
dcfe6390 | 903 | } |
429fdbec | 904 | if (revents & POLLNVAL) { |
f1dc9b30 | 905 | close_handler *ch; |
906 | close_handler *next; | |
76f87348 | 907 | fde *F = &fd_table[fd]; |
a3d5953d | 908 | debug(5, 0) ("WARNING: FD %d has handlers, but it's invalid.\n", fd); |
909 | debug(5, 0) ("FD %d is a %s\n", fd, fdstatTypeStr[fd_table[fd].type]); | |
910 | debug(5, 0) ("--> %s\n", fd_table[fd].desc); | |
911 | debug(5, 0) ("tmout:%p read:%p write:%p\n", | |
76f87348 | 912 | F->timeout_handler, |
913 | F->read_handler, | |
914 | F->write_handler); | |
76f87348 | 915 | for (ch = F->close_handler; ch; ch = ch->next) |
a3d5953d | 916 | debug(5, 0) (" close handler: %p\n", ch->handler); |
76f87348 | 917 | if (F->close_handler) { |
918 | for (ch = F->close_handler; ch; ch = next) { | |
dcfe6390 | 919 | next = ch->next; |
920 | ch->handler(fd, ch->data); | |
921 | safe_free(ch); | |
922 | } | |
76f87348 | 923 | } else if (F->timeout_handler) { |
a3d5953d | 924 | debug(5, 0) ("comm_poll: Calling Timeout Handler\n"); |
76f87348 | 925 | F->timeout_handler(fd, F->timeout_data); |
dcfe6390 | 926 | } |
76f87348 | 927 | F->close_handler = NULL; |
928 | F->timeout_handler = NULL; | |
929 | F->read_handler = NULL; | |
930 | F->write_handler = NULL; | |
dcfe6390 | 931 | } |
97c03d3c | 932 | lastinc = polledinc; |
dcfe6390 | 933 | } |
934 | return COMM_OK; | |
97c03d3c | 935 | } while (timeout > squid_curtime); |
a3d5953d | 936 | debug(5, 8) ("comm_poll: time out: %d.\n", squid_curtime); |
dcfe6390 | 937 | return COMM_TIMEOUT; |
055f4d4d | 938 | } |
090089c4 | 939 | |
dcfe6390 | 940 | #else |
090089c4 | 941 | |
942 | /* Select on all sockets; call handlers for those that are ready. */ | |
b8d8561b | 943 | int |
944 | comm_select(time_t sec) | |
090089c4 | 945 | { |
090089c4 | 946 | fd_set readfds; |
947 | fd_set writefds; | |
582b6456 | 948 | PF *hdl = NULL; |
7d49daab | 949 | int fd; |
950 | int i; | |
951 | int maxfd; | |
952 | int nfds; | |
090089c4 | 953 | int num; |
97c03d3c | 954 | static int incoming_counter = 0; |
090089c4 | 955 | static time_t last_timeout = 0; |
956 | struct timeval poll_time; | |
97c03d3c | 957 | static int lastinc; |
7d49daab | 958 | time_t timeout; |
090089c4 | 959 | |
960 | /* assume all process are very fast (less than 1 second). Call | |
961 | * time() only once */ | |
090089c4 | 962 | /* use only 1 second granularity */ |
b8de7ebe | 963 | timeout = squid_curtime + sec; |
090089c4 | 964 | |
f7361640 | 965 | do { |
090089c4 | 966 | FD_ZERO(&readfds); |
967 | FD_ZERO(&writefds); | |
bbdb774b | 968 | if (shutdown_pending || reconfigure_pending) { |
30a4f2a8 | 969 | serverConnectionsClose(); |
f88bb09c | 970 | dnsShutdownServers(); |
d2af9477 | 971 | redirectShutdownServers(); |
429fdbec | 972 | /* shutdown_pending will be set to |
973 | * +1 for SIGTERM | |
974 | * -1 for SIGINT */ | |
bbdb774b | 975 | /* reconfigure_pending always == 1 when SIGHUP received */ |
976 | if (shutdown_pending > 0 || reconfigure_pending > 0) | |
5c5783a2 | 977 | setSocketShutdownLifetimes(Config.shutdownLifetime); |
f3753518 | 978 | else |
979 | setSocketShutdownLifetimes(0); | |
30a4f2a8 | 980 | } |
4d64d74a | 981 | nfds = 0; |
429fdbec | 982 | maxfd = Biggest_FD + 1; |
4d64d74a | 983 | for (i = 0; i < maxfd; i++) { |
090089c4 | 984 | /* Check each open socket for a handler. */ |
da2b3a17 | 985 | if (fd_table[i].read_handler && !commDeferRead(i)) { |
4d64d74a | 986 | nfds++; |
090089c4 | 987 | FD_SET(i, &readfds); |
4d64d74a | 988 | } |
989 | if (fd_table[i].write_handler) { | |
990 | nfds++; | |
090089c4 | 991 | FD_SET(i, &writefds); |
4d64d74a | 992 | } |
090089c4 | 993 | } |
bbdb774b | 994 | if (shutdown_pending || reconfigure_pending) |
a3d5953d | 995 | debug(5, 2) ("comm_select: Still waiting on %d FDs\n", nfds); |
4d64d74a | 996 | if (nfds == 0) |
997 | return COMM_SHUTDOWN; | |
0a0bf5db | 998 | #if USE_ASYNC_IO |
999 | aioCheckCallbacks(); | |
1000 | #endif | |
7690e8eb | 1001 | for (;;) { |
89fb2544 | 1002 | poll_time.tv_sec = sec > 0 ? 1 : 0; |
090089c4 | 1003 | poll_time.tv_usec = 0; |
d0217c9b | 1004 | num = select(maxfd, &readfds, &writefds, NULL, &poll_time); |
429fdbec | 1005 | select_loops++; |
090089c4 | 1006 | if (num >= 0) |
1007 | break; | |
4d64d74a | 1008 | if (errno == EINTR) |
1009 | break; | |
a3d5953d | 1010 | debug(50, 0) ("comm_select: select failure: %s\n", |
30a4f2a8 | 1011 | xstrerror()); |
d0217c9b | 1012 | examine_select(&readfds, &writefds); |
bf9f8f2b | 1013 | return COMM_ERROR; |
30a4f2a8 | 1014 | /* NOTREACHED */ |
090089c4 | 1015 | } |
4d64d74a | 1016 | if (num < 0) |
1017 | continue; | |
a3d5953d | 1018 | debug(5, num ? 5 : 8) ("comm_select: %d sockets ready at %d\n", |
30a4f2a8 | 1019 | num, (int) squid_curtime); |
090089c4 | 1020 | |
1021 | /* Check lifetime and timeout handlers ONCE each second. | |
1022 | * Replaces brain-dead check every time through the loop! */ | |
b8de7ebe | 1023 | if (squid_curtime > last_timeout) { |
1024 | last_timeout = squid_curtime; | |
090089c4 | 1025 | checkTimeouts(); |
090089c4 | 1026 | } |
7d49daab | 1027 | if (num == 0) |
1028 | continue; | |
1029 | ||
090089c4 | 1030 | /* scan each socket but the accept socket. Poll this |
2c5294ce | 1031 | * more frequently to minimize losses due to the 5 connect |
090089c4 | 1032 | * limit in SunOS */ |
1033 | ||
5742d7c9 | 1034 | for (fd = 0; fd < maxfd; fd++) { |
d0217c9b | 1035 | if (!FD_ISSET(fd, &readfds) && !FD_ISSET(fd, &writefds)) |
7d49daab | 1036 | continue; |
cb2f803a | 1037 | if ((incoming_counter++ & (lastinc > 0 ? 1 : 7)) == 0) |
1038 | comm_select_incoming(); | |
812ed90c | 1039 | if (fdIsHttpOrIcp(fd)) |
7d49daab | 1040 | continue; |
7d49daab | 1041 | if (FD_ISSET(fd, &readfds)) { |
a3d5953d | 1042 | debug(5, 6) ("comm_select: FD %d ready for reading\n", fd); |
7d49daab | 1043 | if (fd_table[fd].read_handler) { |
ff8d0ea6 | 1044 | hdl = fd_table[fd].read_handler; |
76f87348 | 1045 | fd_table[fd].read_handler = NULL; |
ff8d0ea6 | 1046 | hdl(fd, fd_table[fd].read_data); |
090089c4 | 1047 | } |
7d49daab | 1048 | } |
1049 | if (FD_ISSET(fd, &writefds)) { | |
a3d5953d | 1050 | debug(5, 5) ("comm_select: FD %d ready for writing\n", fd); |
7d49daab | 1051 | if (fd_table[fd].write_handler) { |
ff8d0ea6 | 1052 | hdl = fd_table[fd].write_handler; |
76f87348 | 1053 | fd_table[fd].write_handler = NULL; |
ff8d0ea6 | 1054 | hdl(fd, fd_table[fd].write_data); |
090089c4 | 1055 | } |
7d49daab | 1056 | } |
97c03d3c | 1057 | lastinc = polledinc; |
090089c4 | 1058 | } |
7d49daab | 1059 | return COMM_OK; |
97c03d3c | 1060 | } while (timeout > squid_curtime); |
a3d5953d | 1061 | debug(5, 8) ("comm_select: time out: %d.\n", squid_curtime); |
090089c4 | 1062 | return COMM_TIMEOUT; |
1063 | } | |
dcfe6390 | 1064 | #endif |
090089c4 | 1065 | |
b8d8561b | 1066 | void |
582b6456 | 1067 | commSetSelect(int fd, unsigned int type, PF * handler, void *client_data, time_t timeout) |
090089c4 | 1068 | { |
89de058c | 1069 | fde *F = &fd_table[fd]; |
489b22c1 | 1070 | assert(fd >= 0); |
89de058c | 1071 | assert(F->open == FD_OPEN); |
cebe3f19 | 1072 | debug(5, 5) ("commSetSelect: FD %d type %d\n", fd, type); |
090089c4 | 1073 | if (type & COMM_SELECT_READ) { |
76f87348 | 1074 | F->read_handler = handler; |
1075 | F->read_data = client_data; | |
090089c4 | 1076 | } |
1077 | if (type & COMM_SELECT_WRITE) { | |
76f87348 | 1078 | F->write_handler = handler; |
1079 | F->write_data = client_data; | |
090089c4 | 1080 | } |
5c5783a2 | 1081 | if (timeout) |
76f87348 | 1082 | F->timeout = squid_curtime + timeout; |
090089c4 | 1083 | } |
1084 | ||
b8d8561b | 1085 | void |
582b6456 | 1086 | comm_add_close_handler(int fd, PF * handler, void *data) |
30a4f2a8 | 1087 | { |
f1dc9b30 | 1088 | close_handler *new = xmalloc(sizeof(*new)); |
a3d5953d | 1089 | debug(5, 5) ("comm_add_close_handler: FD %d, handler=%p, data=%p\n", |
e0c42e90 | 1090 | fd, handler, data); |
30a4f2a8 | 1091 | new->handler = handler; |
1092 | new->data = data; | |
1093 | new->next = fd_table[fd].close_handler; | |
1094 | fd_table[fd].close_handler = new; | |
603a02fd | 1095 | cbdataLock(data); |
30a4f2a8 | 1096 | } |
1097 | ||
b8d8561b | 1098 | void |
582b6456 | 1099 | comm_remove_close_handler(int fd, PF * handler, void *data) |
090089c4 | 1100 | { |
f1dc9b30 | 1101 | close_handler *p; |
1102 | close_handler *last = NULL; | |
30a4f2a8 | 1103 | /* Find handler in list */ |
1104 | for (p = fd_table[fd].close_handler; p != NULL; last = p, p = p->next) | |
1105 | if (p->handler == handler && p->data == data) | |
1106 | break; /* This is our handler */ | |
f88211e8 | 1107 | assert(p != NULL); |
30a4f2a8 | 1108 | /* Remove list entry */ |
1109 | if (last) | |
1110 | last->next = p->next; | |
1111 | else | |
1112 | fd_table[fd].close_handler = p->next; | |
1113 | safe_free(p); | |
1114 | } | |
090089c4 | 1115 | |
b8d8561b | 1116 | static void |
1117 | commSetNoLinger(int fd) | |
30a4f2a8 | 1118 | { |
1119 | struct linger L; | |
090089c4 | 1120 | L.l_onoff = 0; /* off */ |
1121 | L.l_linger = 0; | |
30a4f2a8 | 1122 | if (setsockopt(fd, SOL_SOCKET, SO_LINGER, (char *) &L, sizeof(L)) < 0) |
a3d5953d | 1123 | debug(50, 0) ("commSetNoLinger: FD %d: %s\n", fd, xstrerror()); |
090089c4 | 1124 | } |
1125 | ||
b8d8561b | 1126 | static void |
1127 | commSetReuseAddr(int fd) | |
090089c4 | 1128 | { |
1129 | int on = 1; | |
30a4f2a8 | 1130 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof(on)) < 0) |
a3d5953d | 1131 | debug(50, 1) ("commSetReuseAddr: FD %d: %s\n", fd, xstrerror()); |
090089c4 | 1132 | } |
1133 | ||
b8d8561b | 1134 | static void |
1135 | commSetTcpRcvbuf(int fd, int size) | |
f868539a | 1136 | { |
1137 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (char *) &size, sizeof(size)) < 0) | |
a3d5953d | 1138 | debug(50, 1) ("commSetTcpRcvbuf: FD %d, SIZE %d: %s\n", |
b6f794d6 | 1139 | fd, size, xstrerror()); |
f868539a | 1140 | } |
1141 | ||
b8d8561b | 1142 | int |
1143 | commSetNonBlocking(int fd) | |
30a4f2a8 | 1144 | { |
731e4d49 | 1145 | int flags; |
9e205701 | 1146 | int dummy = 0; |
95cf2361 | 1147 | if ((flags = fcntl(fd, F_GETFL, dummy)) < 0) { |
a3d5953d | 1148 | debug(50, 0) ("FD %d: fcntl F_GETFL: %s\n", fd, xstrerror()); |
731e4d49 | 1149 | return COMM_ERROR; |
1150 | } | |
4f92c80c | 1151 | if (fcntl(fd, F_SETFL, flags | SQUID_NONBLOCK) < 0) { |
a3d5953d | 1152 | debug(50, 0) ("commSetNonBlocking: FD %d: %s\n", fd, xstrerror()); |
30a4f2a8 | 1153 | return COMM_ERROR; |
090089c4 | 1154 | } |
090089c4 | 1155 | return 0; |
1156 | } | |
1157 | ||
b8d8561b | 1158 | void |
1159 | commSetCloseOnExec(int fd) | |
3ca60c86 | 1160 | { |
1161 | #ifdef FD_CLOEXEC | |
731e4d49 | 1162 | int flags; |
c7989865 | 1163 | int dummy; |
1164 | if ((flags = fcntl(fd, F_GETFL, dummy)) < 0) { | |
a3d5953d | 1165 | debug(50, 0) ("FD %d: fcntl F_GETFL: %s\n", fd, xstrerror()); |
24382924 | 1166 | return; |
3ca60c86 | 1167 | } |
24382924 | 1168 | if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0) |
a3d5953d | 1169 | debug(50, 0) ("FD %d: set close-on-exec failed: %s\n", fd, xstrerror()); |
3ca60c86 | 1170 | #endif |
1171 | } | |
1172 | ||
e90100aa | 1173 | #ifdef TCP_NODELAY |
1174 | static void | |
1175 | commSetTcpNoDelay(int fd) | |
1176 | { | |
1177 | int on = 1; | |
1178 | if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &on, sizeof(on)) < 0) | |
a3d5953d | 1179 | debug(50, 1) ("commSetTcpNoDelay: FD %d: %s\n", fd, xstrerror()); |
e90100aa | 1180 | } |
1181 | #endif | |
1182 | ||
b8d8561b | 1183 | int |
0673c0ba | 1184 | comm_init(void) |
090089c4 | 1185 | { |
f1dc9b30 | 1186 | fd_table = xcalloc(Squid_MaxFD, sizeof(fde)); |
1187 | meta_data.misc += Squid_MaxFD * sizeof(fde); | |
090089c4 | 1188 | /* Keep a few file descriptors free so that we don't run out of FD's |
1189 | * after accepting a client but before it opens a socket or a file. | |
e83892e9 | 1190 | * Since Squid_MaxFD can be as high as several thousand, don't waste them */ |
1191 | RESERVED_FD = min(100, Squid_MaxFD / 4); | |
090089c4 | 1192 | /* hardwired lifetimes */ |
e83892e9 | 1193 | meta_data.misc += Squid_MaxFD * sizeof(int); |
055f4d4d | 1194 | zero_tv.tv_sec = 0; |
1195 | zero_tv.tv_usec = 0; | |
090089c4 | 1196 | return 0; |
1197 | } | |
1198 | ||
1199 | ||
f88211e8 | 1200 | #if !HAVE_POLL |
090089c4 | 1201 | /* |
1202 | * examine_select - debug routine. | |
1203 | * | |
1204 | * I spend the day chasing this core dump that occurs when both the client | |
1205 | * and the server side of a cache fetch simultaneoulsy abort the | |
1206 | * connection. While I haven't really studied the code to figure out how | |
1207 | * it happens, the snippet below may prevent the cache from exitting: | |
1208 | * | |
1209 | * Call this from where the select loop fails. | |
1210 | */ | |
b8d8561b | 1211 | static int |
5742d7c9 | 1212 | examine_select(fd_set * readfds, fd_set * writefds) |
090089c4 | 1213 | { |
1214 | int fd = 0; | |
bbc5ea8f | 1215 | fd_set read_x; |
1216 | fd_set write_x; | |
090089c4 | 1217 | int num; |
1218 | struct timeval tv; | |
f1dc9b30 | 1219 | close_handler *ch = NULL; |
1220 | close_handler *next = NULL; | |
76f87348 | 1221 | fde *F = NULL; |
090089c4 | 1222 | |
a3d5953d | 1223 | debug(5, 0) ("examine_select: Examining open file descriptors...\n"); |
e83892e9 | 1224 | for (fd = 0; fd < Squid_MaxFD; fd++) { |
090089c4 | 1225 | FD_ZERO(&read_x); |
1226 | FD_ZERO(&write_x); | |
090089c4 | 1227 | tv.tv_sec = tv.tv_usec = 0; |
af00901c | 1228 | if (FD_ISSET(fd, readfds)) |
090089c4 | 1229 | FD_SET(fd, &read_x); |
af00901c | 1230 | else if (FD_ISSET(fd, writefds)) |
1231 | FD_SET(fd, &write_x); | |
af00901c | 1232 | else |
1233 | continue; | |
e83892e9 | 1234 | num = select(Squid_MaxFD, &read_x, &write_x, NULL, &tv); |
af00901c | 1235 | if (num > -1) { |
a3d5953d | 1236 | debug(5, 5) ("FD %d is valid.\n", fd); |
af00901c | 1237 | continue; |
1238 | } | |
76f87348 | 1239 | F = &fd_table[fd]; |
a3d5953d | 1240 | debug(5, 0) ("FD %d: %s\n", fd, xstrerror()); |
1241 | debug(5, 0) ("WARNING: FD %d has handlers, but it's invalid.\n", fd); | |
1242 | debug(5, 0) ("FD %d is a %s called '%s'\n", | |
ca98227c | 1243 | fd, |
95d15928 | 1244 | fdstatTypeStr[fd_table[fd].type], |
76f87348 | 1245 | F->desc); |
a3d5953d | 1246 | debug(5, 0) ("tmout:%p read:%p write:%p\n", |
76f87348 | 1247 | F->timeout_handler, |
1248 | F->read_handler, | |
1249 | F->write_handler); | |
1250 | for (ch = F->close_handler; ch; ch = ch->next) | |
a3d5953d | 1251 | debug(5, 0) (" close handler: %p\n", ch->handler); |
76f87348 | 1252 | if (F->close_handler) { |
1253 | for (ch = F->close_handler; ch; ch = next) { | |
af00901c | 1254 | next = ch->next; |
1255 | ch->handler(fd, ch->data); | |
1256 | safe_free(ch); | |
090089c4 | 1257 | } |
76f87348 | 1258 | } else if (F->timeout_handler) { |
a3d5953d | 1259 | debug(5, 0) ("examine_select: Calling Timeout Handler\n"); |
76f87348 | 1260 | F->timeout_handler(fd, F->timeout_data); |
090089c4 | 1261 | } |
76f87348 | 1262 | F->close_handler = NULL; |
1263 | F->timeout_handler = NULL; | |
1264 | F->read_handler = NULL; | |
1265 | F->write_handler = NULL; | |
af00901c | 1266 | FD_CLR(fd, readfds); |
1267 | FD_CLR(fd, writefds); | |
090089c4 | 1268 | } |
090089c4 | 1269 | return 0; |
1270 | } | |
dcfe6390 | 1271 | #endif |
090089c4 | 1272 | |
b8d8561b | 1273 | static void |
0673c0ba | 1274 | checkTimeouts(void) |
090089c4 | 1275 | { |
1276 | int fd; | |
76f87348 | 1277 | fde *F = NULL; |
5c5783a2 | 1278 | PF *callback; |
429fdbec | 1279 | for (fd = 0; fd <= Biggest_FD; fd++) { |
76f87348 | 1280 | F = &fd_table[fd]; |
1281 | if (F->open != FD_OPEN) | |
429fdbec | 1282 | continue; |
76f87348 | 1283 | if (F->timeout == 0) |
30a4f2a8 | 1284 | continue; |
76f87348 | 1285 | if (F->timeout > squid_curtime) |
30a4f2a8 | 1286 | continue; |
a3d5953d | 1287 | debug(5, 5) ("checkTimeouts: FD %d Expired\n", fd); |
76f87348 | 1288 | if (F->timeout_handler) { |
a3d5953d | 1289 | debug(5, 5) ("checkTimeouts: FD %d: Call timeout handler\n", fd); |
76f87348 | 1290 | callback = F->timeout_handler; |
1291 | F->timeout_handler = NULL; | |
1292 | callback(fd, F->timeout_data); | |
30a4f2a8 | 1293 | } else { |
a3d5953d | 1294 | debug(5, 5) ("checkTimeouts: FD %d: Forcing comm_close()\n", fd); |
30a4f2a8 | 1295 | comm_close(fd); |
090089c4 | 1296 | } |
1297 | } | |
1298 | } | |
1299 | ||
30a4f2a8 | 1300 | /* Write to FD. */ |
b8d8561b | 1301 | static void |
582b6456 | 1302 | commHandleWrite(int fd, void *data) |
30a4f2a8 | 1303 | { |
f17936ab | 1304 | CommWriteStateData *state = data; |
30a4f2a8 | 1305 | int len = 0; |
1306 | int nleft; | |
1307 | ||
cebe3f19 | 1308 | debug(5, 5) ("commHandleWrite: FD %d: off %d, sz %d.\n", |
1309 | fd, state->offset, state->size); | |
30a4f2a8 | 1310 | |
1311 | nleft = state->size - state->offset; | |
1312 | len = write(fd, state->buf + state->offset, nleft); | |
b69f7771 | 1313 | fd_bytes(fd, len, FD_WRITE); |
30a4f2a8 | 1314 | |
1315 | if (len == 0) { | |
1316 | /* Note we even call write if nleft == 0 */ | |
1317 | /* We're done */ | |
1318 | if (nleft != 0) | |
02be0294 | 1319 | debug(5, 1) ("commHandleWrite: FD %d: write failure: connection closed with %d bytes remaining.\n", fd, nleft); |
f17936ab | 1320 | CommWriteStateCallbackAndFree(fd, nleft ? COMM_ERROR : COMM_OK); |
30a4f2a8 | 1321 | } else if (len < 0) { |
1322 | /* An error */ | |
26a880e2 | 1323 | if (ignoreErrno(errno)) { |
a3d5953d | 1324 | debug(50, 10) ("commHandleWrite: FD %d: write failure: %s.\n", |
30a4f2a8 | 1325 | fd, xstrerror()); |
b177367b | 1326 | commSetSelect(fd, |
30a4f2a8 | 1327 | COMM_SELECT_WRITE, |
cd1fb0eb | 1328 | commHandleWrite, |
b177367b | 1329 | state, |
85d7ea98 | 1330 | 0); |
9864ee44 | 1331 | } else { |
a3d5953d | 1332 | debug(50, 2) ("commHandleWrite: FD %d: write failure: %s.\n", |
9864ee44 | 1333 | fd, xstrerror()); |
f17936ab | 1334 | CommWriteStateCallbackAndFree(fd, COMM_ERROR); |
30a4f2a8 | 1335 | } |
30a4f2a8 | 1336 | } else { |
1337 | /* A successful write, continue */ | |
1338 | state->offset += len; | |
1339 | if (state->offset < state->size) { | |
1340 | /* Not done, reinstall the write handler and write some more */ | |
b177367b | 1341 | commSetSelect(fd, |
30a4f2a8 | 1342 | COMM_SELECT_WRITE, |
cd1fb0eb | 1343 | commHandleWrite, |
b177367b | 1344 | state, |
85d7ea98 | 1345 | 0); |
9864ee44 | 1346 | } else { |
f17936ab | 1347 | CommWriteStateCallbackAndFree(fd, COMM_OK); |
30a4f2a8 | 1348 | } |
30a4f2a8 | 1349 | } |
1350 | } | |
1351 | ||
1352 | ||
1353 | ||
1354 | /* Select for Writing on FD, until SIZE bytes are sent. Call | |
1355 | * * HANDLER when complete. */ | |
b8d8561b | 1356 | void |
9e4ad609 | 1357 | comm_write(int fd, char *buf, int size, CWCB * handler, void *handler_data, FREE * free_func) |
30a4f2a8 | 1358 | { |
f17936ab | 1359 | CommWriteStateData *state = NULL; |
a3d5953d | 1360 | debug(5, 5) ("comm_write: FD %d: sz %d: hndl %p: data %p.\n", |
787869c5 | 1361 | fd, size, handler, handler_data); |
03eb2f01 | 1362 | assert(fd_table[fd].rwstate == NULL); |
f17936ab | 1363 | state = xcalloc(1, sizeof(CommWriteStateData)); |
30a4f2a8 | 1364 | state->buf = buf; |
1365 | state->size = size; | |
1366 | state->offset = 0; | |
1367 | state->handler = handler; | |
30a4f2a8 | 1368 | state->handler_data = handler_data; |
86ee2017 | 1369 | state->free = free_func; |
a56a3abe | 1370 | fd_table[fd].rwstate = state; |
1a8f5ed6 | 1371 | cbdataLock(handler_data); |
b177367b | 1372 | commSetSelect(fd, |
30a4f2a8 | 1373 | COMM_SELECT_WRITE, |
cd1fb0eb | 1374 | commHandleWrite, |
b177367b | 1375 | fd_table[fd].rwstate, |
1376 | 0); | |
30a4f2a8 | 1377 | } |
26a880e2 | 1378 | |
1379 | static int | |
1380 | ignoreErrno(int errno) | |
1381 | { | |
1382 | if (errno == EWOULDBLOCK) | |
1383 | return 1; | |
1384 | #if EAGAIN != EWOULDBLOCK | |
1385 | if (errno == EAGAIN) | |
1386 | return 1; | |
1387 | #endif | |
1388 | if (errno == EALREADY) | |
1389 | return 1; | |
1390 | if (errno == EINTR) | |
1391 | return 1; | |
1392 | return 0; | |
1393 | } |