Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * pqcomm.c
4 : * Communication functions between the Frontend and the Backend
5 : *
6 : * These routines handle the low-level details of communication between
7 : * frontend and backend. They just shove data across the communication
8 : * channel, and are ignorant of the semantics of the data.
9 : *
10 : * To emit an outgoing message, use the routines in pqformat.c to construct
11 : * the message in a buffer and then emit it in one call to pq_putmessage.
12 : * There are no functions to send raw bytes or partial messages; this
13 : * ensures that the channel will not be clogged by an incomplete message if
14 : * execution is aborted by ereport(ERROR) partway through the message.
15 : *
16 : * At one time, libpq was shared between frontend and backend, but now
17 : * the backend's "backend/libpq" is quite separate from "interfaces/libpq".
18 : * All that remains is similarities of names to trap the unwary...
19 : *
20 : * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
21 : * Portions Copyright (c) 1994, Regents of the University of California
22 : *
23 : * src/backend/libpq/pqcomm.c
24 : *
25 : *-------------------------------------------------------------------------
26 : */
27 :
28 : /*------------------------
29 : * INTERFACE ROUTINES
30 : *
31 : * setup/teardown:
32 : * ListenServerPort - Open postmaster's server port
33 : * AcceptConnection - Accept new connection with client
34 : * TouchSocketFiles - Protect socket files against /tmp cleaners
35 : * pq_init - initialize libpq at backend startup
36 : * socket_comm_reset - reset libpq during error recovery
37 : * socket_close - shutdown libpq at backend exit
38 : *
39 : * low-level I/O:
40 : * pq_getbytes - get a known number of bytes from connection
41 : * pq_getmessage - get a message with length word from connection
42 : * pq_getbyte - get next byte from connection
43 : * pq_peekbyte - peek at next byte from connection
44 : * pq_flush - flush pending output
45 : * pq_flush_if_writable - flush pending output if writable without blocking
46 : * pq_getbyte_if_available - get a byte if available without blocking
47 : *
48 : * message-level I/O
49 : * pq_putmessage - send a normal message (suppressed in COPY OUT mode)
50 : * pq_putmessage_noblock - buffer a normal message (suppressed in COPY OUT)
51 : *
52 : *------------------------
53 : */
54 : #include "postgres.h"
55 :
56 : #ifdef HAVE_POLL_H
57 : #include <poll.h>
58 : #endif
59 : #include <signal.h>
60 : #include <fcntl.h>
61 : #include <grp.h>
62 : #include <unistd.h>
63 : #include <sys/file.h>
64 : #include <sys/socket.h>
65 : #include <sys/stat.h>
66 : #include <sys/time.h>
67 : #include <netdb.h>
68 : #include <netinet/in.h>
69 : #include <netinet/tcp.h>
70 : #include <utime.h>
71 : #ifdef WIN32
72 : #include <mstcpip.h>
73 : #endif
74 :
75 : #include "common/ip.h"
76 : #include "libpq/libpq.h"
77 : #include "miscadmin.h"
78 : #include "port/pg_bswap.h"
79 : #include "postmaster/postmaster.h"
80 : #include "storage/ipc.h"
81 : #include "utils/guc_hooks.h"
82 : #include "utils/memutils.h"
83 :
84 : /*
85 : * Cope with the various platform-specific ways to spell TCP keepalive socket
86 : * options. This doesn't cover Windows, which as usual does its own thing.
87 : */
88 : #if defined(TCP_KEEPIDLE)
89 : /* TCP_KEEPIDLE is the name of this option on Linux and *BSD */
90 : #define PG_TCP_KEEPALIVE_IDLE TCP_KEEPIDLE
91 : #define PG_TCP_KEEPALIVE_IDLE_STR "TCP_KEEPIDLE"
92 : #elif defined(TCP_KEEPALIVE_THRESHOLD)
93 : /* TCP_KEEPALIVE_THRESHOLD is the name of this option on Solaris >= 11 */
94 : #define PG_TCP_KEEPALIVE_IDLE TCP_KEEPALIVE_THRESHOLD
95 : #define PG_TCP_KEEPALIVE_IDLE_STR "TCP_KEEPALIVE_THRESHOLD"
96 : #elif defined(TCP_KEEPALIVE) && defined(__darwin__)
97 : /* TCP_KEEPALIVE is the name of this option on macOS */
98 : /* Caution: Solaris has this symbol but it means something different */
99 : #define PG_TCP_KEEPALIVE_IDLE TCP_KEEPALIVE
100 : #define PG_TCP_KEEPALIVE_IDLE_STR "TCP_KEEPALIVE"
101 : #endif
102 :
103 : /*
104 : * Configuration options
105 : */
106 : int Unix_socket_permissions;
107 : char *Unix_socket_group;
108 :
109 : /* Where the Unix socket files are (list of palloc'd strings) */
110 : static List *sock_paths = NIL;
111 :
112 : /*
113 : * Buffers for low-level I/O.
114 : *
115 : * The receive buffer is fixed size. Send buffer is usually 8k, but can be
116 : * enlarged by pq_putmessage_noblock() if the message doesn't fit otherwise.
117 : */
118 :
119 : #define PQ_SEND_BUFFER_SIZE 8192
120 : #define PQ_RECV_BUFFER_SIZE 8192
121 :
122 : static char *PqSendBuffer;
123 : static int PqSendBufferSize; /* Size send buffer */
124 : static size_t PqSendPointer; /* Next index to store a byte in PqSendBuffer */
125 : static size_t PqSendStart; /* Next index to send a byte in PqSendBuffer */
126 :
127 : static char PqRecvBuffer[PQ_RECV_BUFFER_SIZE];
128 : static int PqRecvPointer; /* Next index to read a byte from PqRecvBuffer */
129 : static int PqRecvLength; /* End of data available in PqRecvBuffer */
130 :
131 : /*
132 : * Message status
133 : */
134 : static bool PqCommBusy; /* busy sending data to the client */
135 : static bool PqCommReadingMsg; /* in the middle of reading a message */
136 :
137 :
138 : /* Internal functions */
139 : static void socket_comm_reset(void);
140 : static void socket_close(int code, Datum arg);
141 : static void socket_set_nonblocking(bool nonblocking);
142 : static int socket_flush(void);
143 : static int socket_flush_if_writable(void);
144 : static bool socket_is_send_pending(void);
145 : static int socket_putmessage(char msgtype, const char *s, size_t len);
146 : static void socket_putmessage_noblock(char msgtype, const char *s, size_t len);
147 : static inline int internal_putbytes(const void *b, size_t len);
148 : static inline int internal_flush(void);
149 : static pg_noinline int internal_flush_buffer(const char *buf, size_t *start,
150 : size_t *end);
151 :
152 : static int Lock_AF_UNIX(const char *unixSocketDir, const char *unixSocketPath);
153 : static int Setup_AF_UNIX(const char *sock_path);
154 :
155 : static const PQcommMethods PqCommSocketMethods = {
156 : .comm_reset = socket_comm_reset,
157 : .flush = socket_flush,
158 : .flush_if_writable = socket_flush_if_writable,
159 : .is_send_pending = socket_is_send_pending,
160 : .putmessage = socket_putmessage,
161 : .putmessage_noblock = socket_putmessage_noblock
162 : };
163 :
164 : const PQcommMethods *PqCommMethods = &PqCommSocketMethods;
165 :
166 : WaitEventSet *FeBeWaitSet;
167 :
168 :
169 : /* --------------------------------
170 : * pq_init - initialize libpq at backend startup
171 : * --------------------------------
172 : */
173 : Port *
174 27016 : pq_init(ClientSocket *client_sock)
175 : {
176 : Port *port;
177 : int socket_pos PG_USED_FOR_ASSERTS_ONLY;
178 : int latch_pos PG_USED_FOR_ASSERTS_ONLY;
179 :
180 : /* allocate the Port struct and copy the ClientSocket contents to it */
181 27016 : port = palloc0(sizeof(Port));
182 27016 : port->sock = client_sock->sock;
183 27016 : memcpy(&port->raddr.addr, &client_sock->raddr.addr, client_sock->raddr.salen);
184 27016 : port->raddr.salen = client_sock->raddr.salen;
185 :
186 : /* fill in the server (local) address */
187 27016 : port->laddr.salen = sizeof(port->laddr.addr);
188 27016 : if (getsockname(port->sock,
189 27016 : (struct sockaddr *) &port->laddr.addr,
190 : &port->laddr.salen) < 0)
191 : {
192 0 : ereport(FATAL,
193 : (errmsg("%s() failed: %m", "getsockname")));
194 : }
195 :
196 : /* select NODELAY and KEEPALIVE options if it's a TCP connection */
197 27016 : if (port->laddr.addr.ss_family != AF_UNIX)
198 : {
199 : int on;
200 : #ifdef WIN32
201 : int oldopt;
202 : int optlen;
203 : int newopt;
204 : #endif
205 :
206 : #ifdef TCP_NODELAY
207 576 : on = 1;
208 576 : if (setsockopt(port->sock, IPPROTO_TCP, TCP_NODELAY,
209 : (char *) &on, sizeof(on)) < 0)
210 : {
211 0 : ereport(FATAL,
212 : (errmsg("%s(%s) failed: %m", "setsockopt", "TCP_NODELAY")));
213 : }
214 : #endif
215 576 : on = 1;
216 576 : if (setsockopt(port->sock, SOL_SOCKET, SO_KEEPALIVE,
217 : (char *) &on, sizeof(on)) < 0)
218 : {
219 0 : ereport(FATAL,
220 : (errmsg("%s(%s) failed: %m", "setsockopt", "SO_KEEPALIVE")));
221 : }
222 :
223 : #ifdef WIN32
224 :
225 : /*
226 : * This is a Win32 socket optimization. The OS send buffer should be
227 : * large enough to send the whole Postgres send buffer in one go, or
228 : * performance suffers. The Postgres send buffer can be enlarged if a
229 : * very large message needs to be sent, but we won't attempt to
230 : * enlarge the OS buffer if that happens, so somewhat arbitrarily
231 : * ensure that the OS buffer is at least PQ_SEND_BUFFER_SIZE * 4.
232 : * (That's 32kB with the current default).
233 : *
234 : * The default OS buffer size used to be 8kB in earlier Windows
235 : * versions, but was raised to 64kB in Windows 2012. So it shouldn't
236 : * be necessary to change it in later versions anymore. Changing it
237 : * unnecessarily can even reduce performance, because setting
238 : * SO_SNDBUF in the application disables the "dynamic send buffering"
239 : * feature that was introduced in Windows 7. So before fiddling with
240 : * SO_SNDBUF, check if the current buffer size is already large enough
241 : * and only increase it if necessary.
242 : *
243 : * See https://support.microsoft.com/kb/823764/EN-US/ and
244 : * https://msdn.microsoft.com/en-us/library/bb736549%28v=vs.85%29.aspx
245 : */
246 : optlen = sizeof(oldopt);
247 : if (getsockopt(port->sock, SOL_SOCKET, SO_SNDBUF, (char *) &oldopt,
248 : &optlen) < 0)
249 : {
250 : ereport(FATAL,
251 : (errmsg("%s(%s) failed: %m", "getsockopt", "SO_SNDBUF")));
252 : }
253 : newopt = PQ_SEND_BUFFER_SIZE * 4;
254 : if (oldopt < newopt)
255 : {
256 : if (setsockopt(port->sock, SOL_SOCKET, SO_SNDBUF, (char *) &newopt,
257 : sizeof(newopt)) < 0)
258 : {
259 : ereport(FATAL,
260 : (errmsg("%s(%s) failed: %m", "setsockopt", "SO_SNDBUF")));
261 : }
262 : }
263 : #endif
264 :
265 : /*
266 : * Also apply the current keepalive parameters. If we fail to set a
267 : * parameter, don't error out, because these aren't universally
268 : * supported. (Note: you might think we need to reset the GUC
269 : * variables to 0 in such a case, but it's not necessary because the
270 : * show hooks for these variables report the truth anyway.)
271 : */
272 576 : (void) pq_setkeepalivesidle(tcp_keepalives_idle, port);
273 576 : (void) pq_setkeepalivesinterval(tcp_keepalives_interval, port);
274 576 : (void) pq_setkeepalivescount(tcp_keepalives_count, port);
275 576 : (void) pq_settcpusertimeout(tcp_user_timeout, port);
276 : }
277 :
278 : /* initialize state variables */
279 27016 : PqSendBufferSize = PQ_SEND_BUFFER_SIZE;
280 27016 : PqSendBuffer = MemoryContextAlloc(TopMemoryContext, PqSendBufferSize);
281 27016 : PqSendPointer = PqSendStart = PqRecvPointer = PqRecvLength = 0;
282 27016 : PqCommBusy = false;
283 27016 : PqCommReadingMsg = false;
284 :
285 : /* set up process-exit hook to close the socket */
286 27016 : on_proc_exit(socket_close, 0);
287 :
288 : /*
289 : * In backends (as soon as forked) we operate the underlying socket in
290 : * nonblocking mode and use latches to implement blocking semantics if
291 : * needed. That allows us to provide safely interruptible reads and
292 : * writes.
293 : */
294 : #ifndef WIN32
295 27016 : if (!pg_set_noblock(port->sock))
296 0 : ereport(FATAL,
297 : (errmsg("could not set socket to nonblocking mode: %m")));
298 : #endif
299 :
300 : #ifndef WIN32
301 :
302 : /* Don't give the socket to any subprograms we execute. */
303 27016 : if (fcntl(port->sock, F_SETFD, FD_CLOEXEC) < 0)
304 0 : elog(FATAL, "fcntl(F_SETFD) failed on socket: %m");
305 : #endif
306 :
307 27016 : FeBeWaitSet = CreateWaitEventSet(NULL, FeBeWaitSetNEvents);
308 27016 : socket_pos = AddWaitEventToSet(FeBeWaitSet, WL_SOCKET_WRITEABLE,
309 : port->sock, NULL, NULL);
310 27016 : latch_pos = AddWaitEventToSet(FeBeWaitSet, WL_LATCH_SET, PGINVALID_SOCKET,
311 : MyLatch, NULL);
312 27016 : AddWaitEventToSet(FeBeWaitSet, WL_POSTMASTER_DEATH, PGINVALID_SOCKET,
313 : NULL, NULL);
314 :
315 : /*
316 : * The event positions match the order we added them, but let's sanity
317 : * check them to be sure.
318 : */
319 : Assert(socket_pos == FeBeWaitSetSocketPos);
320 : Assert(latch_pos == FeBeWaitSetLatchPos);
321 :
322 27016 : return port;
323 : }
324 :
325 : /* --------------------------------
326 : * socket_comm_reset - reset libpq during error recovery
327 : *
328 : * This is called from error recovery at the outer idle loop. It's
329 : * just to get us out of trouble if we somehow manage to elog() from
330 : * inside a pqcomm.c routine (which ideally will never happen, but...)
331 : * --------------------------------
332 : */
333 : static void
334 42638 : socket_comm_reset(void)
335 : {
336 : /* Do not throw away pending data, but do reset the busy flag */
337 42638 : PqCommBusy = false;
338 42638 : }
339 :
340 : /* --------------------------------
341 : * socket_close - shutdown libpq at backend exit
342 : *
343 : * This is the one pg_on_exit_callback in place during BackendInitialize().
344 : * That function's unusual signal handling constrains that this callback be
345 : * safe to run at any instant.
346 : * --------------------------------
347 : */
348 : static void
349 27016 : socket_close(int code, Datum arg)
350 : {
351 : /* Nothing to do in a standalone backend, where MyProcPort is NULL. */
352 27016 : if (MyProcPort != NULL)
353 : {
354 : #ifdef ENABLE_GSS
355 : /*
356 : * Shutdown GSSAPI layer. This section does nothing when interrupting
357 : * BackendInitialize(), because pg_GSS_recvauth() makes first use of
358 : * "ctx" and "cred".
359 : *
360 : * Note that we don't bother to free MyProcPort->gss, since we're
361 : * about to exit anyway.
362 : */
363 : if (MyProcPort->gss)
364 : {
365 : OM_uint32 min_s;
366 :
367 : if (MyProcPort->gss->ctx != GSS_C_NO_CONTEXT)
368 : gss_delete_sec_context(&min_s, &MyProcPort->gss->ctx, NULL);
369 :
370 : if (MyProcPort->gss->cred != GSS_C_NO_CREDENTIAL)
371 : gss_release_cred(&min_s, &MyProcPort->gss->cred);
372 : }
373 : #endif /* ENABLE_GSS */
374 :
375 : /*
376 : * Cleanly shut down SSL layer. Nowhere else does a postmaster child
377 : * call this, so this is safe when interrupting BackendInitialize().
378 : */
379 27016 : secure_close(MyProcPort);
380 :
381 : /*
382 : * Formerly we did an explicit close() here, but it seems better to
383 : * leave the socket open until the process dies. This allows clients
384 : * to perform a "synchronous close" if they care --- wait till the
385 : * transport layer reports connection closure, and you can be sure the
386 : * backend has exited.
387 : *
388 : * We do set sock to PGINVALID_SOCKET to prevent any further I/O,
389 : * though.
390 : */
391 27016 : MyProcPort->sock = PGINVALID_SOCKET;
392 : }
393 27016 : }
394 :
395 :
396 :
397 : /* --------------------------------
398 : * Postmaster functions to handle sockets.
399 : * --------------------------------
400 : */
401 :
402 : /*
403 : * ListenServerPort -- open a "listening" port to accept connections.
404 : *
405 : * family should be AF_UNIX or AF_UNSPEC; portNumber is the port number.
406 : * For AF_UNIX ports, hostName should be NULL and unixSocketDir must be
407 : * specified. For TCP ports, hostName is either NULL for all interfaces or
408 : * the interface to listen on, and unixSocketDir is ignored (can be NULL).
409 : *
410 : * Successfully opened sockets are appended to the ListenSockets[] array. On
411 : * entry, *NumListenSockets holds the number of elements currently in the
412 : * array, and it is updated to reflect the opened sockets. MaxListen is the
413 : * allocated size of the array.
414 : *
415 : * RETURNS: STATUS_OK or STATUS_ERROR
416 : */
417 : int
418 1700 : ListenServerPort(int family, const char *hostName, unsigned short portNumber,
419 : const char *unixSocketDir,
420 : pgsocket ListenSockets[], int *NumListenSockets, int MaxListen)
421 : {
422 : pgsocket fd;
423 : int err;
424 : int maxconn;
425 : int ret;
426 : char portNumberStr[32];
427 : const char *familyDesc;
428 : char familyDescBuf[64];
429 : const char *addrDesc;
430 : char addrBuf[NI_MAXHOST];
431 : char *service;
432 1700 : struct addrinfo *addrs = NULL,
433 : *addr;
434 : struct addrinfo hint;
435 1700 : int added = 0;
436 : char unixSocketPath[MAXPGPATH];
437 : #if !defined(WIN32) || defined(IPV6_V6ONLY)
438 1700 : int one = 1;
439 : #endif
440 :
441 : /* Initialize hint structure */
442 11900 : MemSet(&hint, 0, sizeof(hint));
443 1700 : hint.ai_family = family;
444 1700 : hint.ai_flags = AI_PASSIVE;
445 1700 : hint.ai_socktype = SOCK_STREAM;
446 :
447 1700 : if (family == AF_UNIX)
448 : {
449 : /*
450 : * Create unixSocketPath from portNumber and unixSocketDir and lock
451 : * that file path
452 : */
453 1642 : UNIXSOCK_PATH(unixSocketPath, portNumber, unixSocketDir);
454 1642 : if (strlen(unixSocketPath) >= UNIXSOCK_PATH_BUFLEN)
455 : {
456 0 : ereport(LOG,
457 : (errmsg("Unix-domain socket path \"%s\" is too long (maximum %d bytes)",
458 : unixSocketPath,
459 : (int) (UNIXSOCK_PATH_BUFLEN - 1))));
460 0 : return STATUS_ERROR;
461 : }
462 1642 : if (Lock_AF_UNIX(unixSocketDir, unixSocketPath) != STATUS_OK)
463 0 : return STATUS_ERROR;
464 1642 : service = unixSocketPath;
465 : }
466 : else
467 : {
468 58 : snprintf(portNumberStr, sizeof(portNumberStr), "%d", portNumber);
469 58 : service = portNumberStr;
470 : }
471 :
472 1700 : ret = pg_getaddrinfo_all(hostName, service, &hint, &addrs);
473 1700 : if (ret || !addrs)
474 : {
475 0 : if (hostName)
476 0 : ereport(LOG,
477 : (errmsg("could not translate host name \"%s\", service \"%s\" to address: %s",
478 : hostName, service, gai_strerror(ret))));
479 : else
480 0 : ereport(LOG,
481 : (errmsg("could not translate service \"%s\" to address: %s",
482 : service, gai_strerror(ret))));
483 0 : if (addrs)
484 0 : pg_freeaddrinfo_all(hint.ai_family, addrs);
485 0 : return STATUS_ERROR;
486 : }
487 :
488 3402 : for (addr = addrs; addr; addr = addr->ai_next)
489 : {
490 1702 : if (family != AF_UNIX && addr->ai_family == AF_UNIX)
491 : {
492 : /*
493 : * Only set up a unix domain socket when they really asked for it.
494 : * The service/port is different in that case.
495 : */
496 0 : continue;
497 : }
498 :
499 : /* See if there is still room to add 1 more socket. */
500 1702 : if (*NumListenSockets == MaxListen)
501 : {
502 0 : ereport(LOG,
503 : (errmsg("could not bind to all requested addresses: MAXLISTEN (%d) exceeded",
504 : MaxListen)));
505 0 : break;
506 : }
507 :
508 : /* set up address family name for log messages */
509 1702 : switch (addr->ai_family)
510 : {
511 58 : case AF_INET:
512 58 : familyDesc = _("IPv4");
513 58 : break;
514 2 : case AF_INET6:
515 2 : familyDesc = _("IPv6");
516 2 : break;
517 1642 : case AF_UNIX:
518 1642 : familyDesc = _("Unix");
519 1642 : break;
520 0 : default:
521 0 : snprintf(familyDescBuf, sizeof(familyDescBuf),
522 0 : _("unrecognized address family %d"),
523 : addr->ai_family);
524 0 : familyDesc = familyDescBuf;
525 0 : break;
526 : }
527 :
528 : /* set up text form of address for log messages */
529 1702 : if (addr->ai_family == AF_UNIX)
530 1642 : addrDesc = unixSocketPath;
531 : else
532 : {
533 60 : pg_getnameinfo_all((const struct sockaddr_storage *) addr->ai_addr,
534 60 : addr->ai_addrlen,
535 : addrBuf, sizeof(addrBuf),
536 : NULL, 0,
537 : NI_NUMERICHOST);
538 60 : addrDesc = addrBuf;
539 : }
540 :
541 1702 : if ((fd = socket(addr->ai_family, SOCK_STREAM, 0)) == PGINVALID_SOCKET)
542 : {
543 0 : ereport(LOG,
544 : (errcode_for_socket_access(),
545 : /* translator: first %s is IPv4, IPv6, or Unix */
546 : errmsg("could not create %s socket for address \"%s\": %m",
547 : familyDesc, addrDesc)));
548 0 : continue;
549 : }
550 :
551 : #ifndef WIN32
552 : /* Don't give the listen socket to any subprograms we execute. */
553 1702 : if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0)
554 0 : elog(FATAL, "fcntl(F_SETFD) failed on socket: %m");
555 :
556 : /*
557 : * Without the SO_REUSEADDR flag, a new postmaster can't be started
558 : * right away after a stop or crash, giving "address already in use"
559 : * error on TCP ports.
560 : *
561 : * On win32, however, this behavior only happens if the
562 : * SO_EXCLUSIVEADDRUSE is set. With SO_REUSEADDR, win32 allows
563 : * multiple servers to listen on the same address, resulting in
564 : * unpredictable behavior. With no flags at all, win32 behaves as Unix
565 : * with SO_REUSEADDR.
566 : */
567 1702 : if (addr->ai_family != AF_UNIX)
568 : {
569 60 : if ((setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
570 : (char *) &one, sizeof(one))) == -1)
571 : {
572 0 : ereport(LOG,
573 : (errcode_for_socket_access(),
574 : /* translator: third %s is IPv4 or IPv6 */
575 : errmsg("%s(%s) failed for %s address \"%s\": %m",
576 : "setsockopt", "SO_REUSEADDR",
577 : familyDesc, addrDesc)));
578 0 : closesocket(fd);
579 0 : continue;
580 : }
581 : }
582 : #endif
583 :
584 : #ifdef IPV6_V6ONLY
585 1702 : if (addr->ai_family == AF_INET6)
586 : {
587 2 : if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY,
588 : (char *) &one, sizeof(one)) == -1)
589 : {
590 0 : ereport(LOG,
591 : (errcode_for_socket_access(),
592 : /* translator: third %s is IPv6 */
593 : errmsg("%s(%s) failed for %s address \"%s\": %m",
594 : "setsockopt", "IPV6_V6ONLY",
595 : familyDesc, addrDesc)));
596 0 : closesocket(fd);
597 0 : continue;
598 : }
599 : }
600 : #endif
601 :
602 : /*
603 : * Note: This might fail on some OS's, like Linux older than
604 : * 2.4.21-pre3, that don't have the IPV6_V6ONLY socket option, and map
605 : * ipv4 addresses to ipv6. It will show ::ffff:ipv4 for all ipv4
606 : * connections.
607 : */
608 1702 : err = bind(fd, addr->ai_addr, addr->ai_addrlen);
609 1702 : if (err < 0)
610 : {
611 0 : int saved_errno = errno;
612 :
613 0 : ereport(LOG,
614 : (errcode_for_socket_access(),
615 : /* translator: first %s is IPv4, IPv6, or Unix */
616 : errmsg("could not bind %s address \"%s\": %m",
617 : familyDesc, addrDesc),
618 : saved_errno == EADDRINUSE ?
619 : (addr->ai_family == AF_UNIX ?
620 : errhint("Is another postmaster already running on port %d?",
621 : (int) portNumber) :
622 : errhint("Is another postmaster already running on port %d?"
623 : " If not, wait a few seconds and retry.",
624 : (int) portNumber)) : 0));
625 0 : closesocket(fd);
626 0 : continue;
627 : }
628 :
629 1702 : if (addr->ai_family == AF_UNIX)
630 : {
631 1642 : if (Setup_AF_UNIX(service) != STATUS_OK)
632 : {
633 0 : closesocket(fd);
634 0 : break;
635 : }
636 : }
637 :
638 : /*
639 : * Select appropriate accept-queue length limit. It seems reasonable
640 : * to use a value similar to the maximum number of child processes
641 : * that the postmaster will permit.
642 : */
643 1702 : maxconn = MaxConnections * 2;
644 :
645 1702 : err = listen(fd, maxconn);
646 1702 : if (err < 0)
647 : {
648 0 : ereport(LOG,
649 : (errcode_for_socket_access(),
650 : /* translator: first %s is IPv4, IPv6, or Unix */
651 : errmsg("could not listen on %s address \"%s\": %m",
652 : familyDesc, addrDesc)));
653 0 : closesocket(fd);
654 0 : continue;
655 : }
656 :
657 1702 : if (addr->ai_family == AF_UNIX)
658 1642 : ereport(LOG,
659 : (errmsg("listening on Unix socket \"%s\"",
660 : addrDesc)));
661 : else
662 60 : ereport(LOG,
663 : /* translator: first %s is IPv4 or IPv6 */
664 : (errmsg("listening on %s address \"%s\", port %d",
665 : familyDesc, addrDesc, (int) portNumber)));
666 :
667 1702 : ListenSockets[*NumListenSockets] = fd;
668 1702 : (*NumListenSockets)++;
669 1702 : added++;
670 : }
671 :
672 1700 : pg_freeaddrinfo_all(hint.ai_family, addrs);
673 :
674 1700 : if (!added)
675 0 : return STATUS_ERROR;
676 :
677 1700 : return STATUS_OK;
678 : }
679 :
680 :
681 : /*
682 : * Lock_AF_UNIX -- configure unix socket file path
683 : */
684 : static int
685 1642 : Lock_AF_UNIX(const char *unixSocketDir, const char *unixSocketPath)
686 : {
687 : /* no lock file for abstract sockets */
688 1642 : if (unixSocketPath[0] == '@')
689 0 : return STATUS_OK;
690 :
691 : /*
692 : * Grab an interlock file associated with the socket file.
693 : *
694 : * Note: there are two reasons for using a socket lock file, rather than
695 : * trying to interlock directly on the socket itself. First, it's a lot
696 : * more portable, and second, it lets us remove any pre-existing socket
697 : * file without race conditions.
698 : */
699 1642 : CreateSocketLockFile(unixSocketPath, true, unixSocketDir);
700 :
701 : /*
702 : * Once we have the interlock, we can safely delete any pre-existing
703 : * socket file to avoid failure at bind() time.
704 : */
705 1642 : (void) unlink(unixSocketPath);
706 :
707 : /*
708 : * Remember socket file pathnames for later maintenance.
709 : */
710 1642 : sock_paths = lappend(sock_paths, pstrdup(unixSocketPath));
711 :
712 1642 : return STATUS_OK;
713 : }
714 :
715 :
716 : /*
717 : * Setup_AF_UNIX -- configure unix socket permissions
718 : */
719 : static int
720 1642 : Setup_AF_UNIX(const char *sock_path)
721 : {
722 : /* no file system permissions for abstract sockets */
723 1642 : if (sock_path[0] == '@')
724 0 : return STATUS_OK;
725 :
726 : /*
727 : * Fix socket ownership/permission if requested. Note we must do this
728 : * before we listen() to avoid a window where unwanted connections could
729 : * get accepted.
730 : */
731 : Assert(Unix_socket_group);
732 1642 : if (Unix_socket_group[0] != '\0')
733 : {
734 : #ifdef WIN32
735 : elog(WARNING, "configuration item \"unix_socket_group\" is not supported on this platform");
736 : #else
737 : char *endptr;
738 : unsigned long val;
739 : gid_t gid;
740 :
741 0 : val = strtoul(Unix_socket_group, &endptr, 10);
742 0 : if (*endptr == '\0')
743 : { /* numeric group id */
744 0 : gid = val;
745 : }
746 : else
747 : { /* convert group name to id */
748 : struct group *gr;
749 :
750 0 : gr = getgrnam(Unix_socket_group);
751 0 : if (!gr)
752 : {
753 0 : ereport(LOG,
754 : (errmsg("group \"%s\" does not exist",
755 : Unix_socket_group)));
756 0 : return STATUS_ERROR;
757 : }
758 0 : gid = gr->gr_gid;
759 : }
760 0 : if (chown(sock_path, -1, gid) == -1)
761 : {
762 0 : ereport(LOG,
763 : (errcode_for_file_access(),
764 : errmsg("could not set group of file \"%s\": %m",
765 : sock_path)));
766 0 : return STATUS_ERROR;
767 : }
768 : #endif
769 : }
770 :
771 1642 : if (chmod(sock_path, Unix_socket_permissions) == -1)
772 : {
773 0 : ereport(LOG,
774 : (errcode_for_file_access(),
775 : errmsg("could not set permissions of file \"%s\": %m",
776 : sock_path)));
777 0 : return STATUS_ERROR;
778 : }
779 1642 : return STATUS_OK;
780 : }
781 :
782 :
783 : /*
784 : * AcceptConnection -- accept a new connection with client using
785 : * server port. Fills *client_sock with the FD and endpoint info
786 : * of the new connection.
787 : *
788 : * ASSUME: that this doesn't need to be non-blocking because
789 : * the Postmaster waits for the socket to be ready to accept().
790 : *
791 : * RETURNS: STATUS_OK or STATUS_ERROR
792 : */
793 : int
794 27536 : AcceptConnection(pgsocket server_fd, ClientSocket *client_sock)
795 : {
796 : /* accept connection and fill in the client (remote) address */
797 27536 : client_sock->raddr.salen = sizeof(client_sock->raddr.addr);
798 27536 : if ((client_sock->sock = accept(server_fd,
799 27536 : (struct sockaddr *) &client_sock->raddr.addr,
800 : &client_sock->raddr.salen)) == PGINVALID_SOCKET)
801 : {
802 0 : ereport(LOG,
803 : (errcode_for_socket_access(),
804 : errmsg("could not accept new connection: %m")));
805 :
806 : /*
807 : * If accept() fails then postmaster.c will still see the server
808 : * socket as read-ready, and will immediately try again. To avoid
809 : * uselessly sucking lots of CPU, delay a bit before trying again.
810 : * (The most likely reason for failure is being out of kernel file
811 : * table slots; we can do little except hope some will get freed up.)
812 : */
813 0 : pg_usleep(100000L); /* wait 0.1 sec */
814 0 : return STATUS_ERROR;
815 : }
816 :
817 27536 : return STATUS_OK;
818 : }
819 :
820 : /*
821 : * TouchSocketFiles -- mark socket files as recently accessed
822 : *
823 : * This routine should be called every so often to ensure that the socket
824 : * files have a recent mod date (ordinary operations on sockets usually won't
825 : * change the mod date). That saves them from being removed by
826 : * overenthusiastic /tmp-directory-cleaner daemons. (Another reason we should
827 : * never have put the socket file in /tmp...)
828 : */
829 : void
830 0 : TouchSocketFiles(void)
831 : {
832 : ListCell *l;
833 :
834 : /* Loop through all created sockets... */
835 0 : foreach(l, sock_paths)
836 : {
837 0 : char *sock_path = (char *) lfirst(l);
838 :
839 : /* Ignore errors; there's no point in complaining */
840 0 : (void) utime(sock_path, NULL);
841 : }
842 0 : }
843 :
844 : /*
845 : * RemoveSocketFiles -- unlink socket files at postmaster shutdown
846 : */
847 : void
848 1638 : RemoveSocketFiles(void)
849 : {
850 : ListCell *l;
851 :
852 : /* Loop through all created sockets... */
853 3274 : foreach(l, sock_paths)
854 : {
855 1636 : char *sock_path = (char *) lfirst(l);
856 :
857 : /* Ignore any error. */
858 1636 : (void) unlink(sock_path);
859 : }
860 : /* Since we're about to exit, no need to reclaim storage */
861 1638 : sock_paths = NIL;
862 1638 : }
863 :
864 :
865 : /* --------------------------------
866 : * Low-level I/O routines begin here.
867 : *
868 : * These routines communicate with a frontend client across a connection
869 : * already established by the preceding routines.
870 : * --------------------------------
871 : */
872 :
873 : /* --------------------------------
874 : * socket_set_nonblocking - set socket blocking/non-blocking
875 : *
876 : * Sets the socket non-blocking if nonblocking is true, or sets it
877 : * blocking otherwise.
878 : * --------------------------------
879 : */
880 : static void
881 4817374 : socket_set_nonblocking(bool nonblocking)
882 : {
883 4817374 : if (MyProcPort == NULL)
884 0 : ereport(ERROR,
885 : (errcode(ERRCODE_CONNECTION_DOES_NOT_EXIST),
886 : errmsg("there is no client connection")));
887 :
888 4817374 : MyProcPort->noblock = nonblocking;
889 4817374 : }
890 :
891 : /* --------------------------------
892 : * pq_recvbuf - load some bytes into the input buffer
893 : *
894 : * returns 0 if OK, EOF if trouble
895 : * --------------------------------
896 : */
897 : static int
898 702400 : pq_recvbuf(void)
899 : {
900 702400 : if (PqRecvPointer > 0)
901 : {
902 675384 : if (PqRecvLength > PqRecvPointer)
903 : {
904 : /* still some unread data, left-justify it in the buffer */
905 0 : memmove(PqRecvBuffer, PqRecvBuffer + PqRecvPointer,
906 0 : PqRecvLength - PqRecvPointer);
907 0 : PqRecvLength -= PqRecvPointer;
908 0 : PqRecvPointer = 0;
909 : }
910 : else
911 675384 : PqRecvLength = PqRecvPointer = 0;
912 : }
913 :
914 : /* Ensure that we're in blocking mode */
915 702400 : socket_set_nonblocking(false);
916 :
917 : /* Can fill buffer from PqRecvLength and upwards */
918 : for (;;)
919 0 : {
920 : int r;
921 :
922 702400 : errno = 0;
923 :
924 1404720 : r = secure_read(MyProcPort, PqRecvBuffer + PqRecvLength,
925 702400 : PQ_RECV_BUFFER_SIZE - PqRecvLength);
926 :
927 702320 : if (r < 0)
928 : {
929 10 : if (errno == EINTR)
930 0 : continue; /* Ok if interrupted */
931 :
932 : /*
933 : * Careful: an ereport() that tries to write to the client would
934 : * cause recursion to here, leading to stack overflow and core
935 : * dump! This message must go *only* to the postmaster log.
936 : *
937 : * If errno is zero, assume it's EOF and let the caller complain.
938 : */
939 10 : if (errno != 0)
940 10 : ereport(COMMERROR,
941 : (errcode_for_socket_access(),
942 : errmsg("could not receive data from client: %m")));
943 10 : return EOF;
944 : }
945 702310 : if (r == 0)
946 : {
947 : /*
948 : * EOF detected. We used to write a log message here, but it's
949 : * better to expect the ultimate caller to do that.
950 : */
951 158 : return EOF;
952 : }
953 : /* r contains number of bytes read, so just incr length */
954 702152 : PqRecvLength += r;
955 702152 : return 0;
956 : }
957 : }
958 :
959 : /* --------------------------------
960 : * pq_getbyte - get a single byte from connection, or return EOF
961 : * --------------------------------
962 : */
963 : int
964 1118710 : pq_getbyte(void)
965 : {
966 : Assert(PqCommReadingMsg);
967 :
968 1758562 : while (PqRecvPointer >= PqRecvLength)
969 : {
970 640066 : if (pq_recvbuf()) /* If nothing in buffer, then recv some */
971 134 : return EOF; /* Failed to recv data */
972 : }
973 1118496 : return (unsigned char) PqRecvBuffer[PqRecvPointer++];
974 : }
975 :
976 : /* --------------------------------
977 : * pq_peekbyte - peek at next byte from connection
978 : *
979 : * Same as pq_getbyte() except we don't advance the pointer.
980 : * --------------------------------
981 : */
982 : int
983 27016 : pq_peekbyte(void)
984 : {
985 : Assert(PqCommReadingMsg);
986 :
987 54028 : while (PqRecvPointer >= PqRecvLength)
988 : {
989 27016 : if (pq_recvbuf()) /* If nothing in buffer, then recv some */
990 4 : return EOF; /* Failed to recv data */
991 : }
992 27012 : return (unsigned char) PqRecvBuffer[PqRecvPointer];
993 : }
994 :
995 : /* --------------------------------
996 : * pq_getbyte_if_available - get a single byte from connection,
997 : * if available
998 : *
999 : * The received byte is stored in *c. Returns 1 if a byte was read,
1000 : * 0 if no data was available, or EOF if trouble.
1001 : * --------------------------------
1002 : */
1003 : int
1004 2088044 : pq_getbyte_if_available(unsigned char *c)
1005 : {
1006 : int r;
1007 :
1008 : Assert(PqCommReadingMsg);
1009 :
1010 2088044 : if (PqRecvPointer < PqRecvLength)
1011 : {
1012 50526 : *c = PqRecvBuffer[PqRecvPointer++];
1013 50526 : return 1;
1014 : }
1015 :
1016 : /* Put the socket into non-blocking mode */
1017 2037518 : socket_set_nonblocking(true);
1018 :
1019 2037518 : errno = 0;
1020 :
1021 2037518 : r = secure_read(MyProcPort, c, 1);
1022 2037518 : if (r < 0)
1023 : {
1024 : /*
1025 : * Ok if no data available without blocking or interrupted (though
1026 : * EINTR really shouldn't happen with a non-blocking socket). Report
1027 : * other errors.
1028 : */
1029 2005108 : if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
1030 2005100 : r = 0;
1031 : else
1032 : {
1033 : /*
1034 : * Careful: an ereport() that tries to write to the client would
1035 : * cause recursion to here, leading to stack overflow and core
1036 : * dump! This message must go *only* to the postmaster log.
1037 : *
1038 : * If errno is zero, assume it's EOF and let the caller complain.
1039 : */
1040 8 : if (errno != 0)
1041 8 : ereport(COMMERROR,
1042 : (errcode_for_socket_access(),
1043 : errmsg("could not receive data from client: %m")));
1044 8 : r = EOF;
1045 : }
1046 : }
1047 32410 : else if (r == 0)
1048 : {
1049 : /* EOF detected */
1050 28 : r = EOF;
1051 : }
1052 :
1053 2037518 : return r;
1054 : }
1055 :
1056 : /* --------------------------------
1057 : * pq_getbytes - get a known number of bytes from connection
1058 : *
1059 : * returns 0 if OK, EOF if trouble
1060 : * --------------------------------
1061 : */
1062 : int
1063 2434646 : pq_getbytes(void *b, size_t len)
1064 : {
1065 2434646 : char *s = b;
1066 : size_t amount;
1067 :
1068 : Assert(PqCommReadingMsg);
1069 :
1070 4871676 : while (len > 0)
1071 : {
1072 2472348 : while (PqRecvPointer >= PqRecvLength)
1073 : {
1074 35318 : if (pq_recvbuf()) /* If nothing in buffer, then recv some */
1075 30 : return EOF; /* Failed to recv data */
1076 : }
1077 2437030 : amount = PqRecvLength - PqRecvPointer;
1078 2437030 : if (amount > len)
1079 1735000 : amount = len;
1080 2437030 : memcpy(s, PqRecvBuffer + PqRecvPointer, amount);
1081 2437030 : PqRecvPointer += amount;
1082 2437030 : s += amount;
1083 2437030 : len -= amount;
1084 : }
1085 2434616 : return 0;
1086 : }
1087 :
1088 : /* --------------------------------
1089 : * pq_discardbytes - throw away a known number of bytes
1090 : *
1091 : * same as pq_getbytes except we do not copy the data to anyplace.
1092 : * this is used for resynchronizing after read errors.
1093 : *
1094 : * returns 0 if OK, EOF if trouble
1095 : * --------------------------------
1096 : */
1097 : static int
1098 0 : pq_discardbytes(size_t len)
1099 : {
1100 : size_t amount;
1101 :
1102 : Assert(PqCommReadingMsg);
1103 :
1104 0 : while (len > 0)
1105 : {
1106 0 : while (PqRecvPointer >= PqRecvLength)
1107 : {
1108 0 : if (pq_recvbuf()) /* If nothing in buffer, then recv some */
1109 0 : return EOF; /* Failed to recv data */
1110 : }
1111 0 : amount = PqRecvLength - PqRecvPointer;
1112 0 : if (amount > len)
1113 0 : amount = len;
1114 0 : PqRecvPointer += amount;
1115 0 : len -= amount;
1116 : }
1117 0 : return 0;
1118 : }
1119 :
1120 : /* --------------------------------
1121 : * pq_buffer_remaining_data - return number of bytes in receive buffer
1122 : *
1123 : * This will *not* attempt to read more data. And reading up to that number of
1124 : * bytes should not cause reading any more data either.
1125 : * --------------------------------
1126 : */
1127 : ssize_t
1128 752 : pq_buffer_remaining_data(void)
1129 : {
1130 : Assert(PqRecvLength >= PqRecvPointer);
1131 752 : return (PqRecvLength - PqRecvPointer);
1132 : }
1133 :
1134 :
1135 : /* --------------------------------
1136 : * pq_startmsgread - begin reading a message from the client.
1137 : *
1138 : * This must be called before any of the pq_get* functions.
1139 : * --------------------------------
1140 : */
1141 : void
1142 3261286 : pq_startmsgread(void)
1143 : {
1144 : /*
1145 : * There shouldn't be a read active already, but let's check just to be
1146 : * sure.
1147 : */
1148 3261286 : if (PqCommReadingMsg)
1149 0 : ereport(FATAL,
1150 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1151 : errmsg("terminating connection because protocol synchronization was lost")));
1152 :
1153 3261286 : PqCommReadingMsg = true;
1154 3261286 : }
1155 :
1156 :
1157 : /* --------------------------------
1158 : * pq_endmsgread - finish reading message.
1159 : *
1160 : * This must be called after reading a message with pq_getbytes()
1161 : * and friends, to indicate that we have read the whole message.
1162 : * pq_getmessage() does this implicitly.
1163 : * --------------------------------
1164 : */
1165 : void
1166 2059602 : pq_endmsgread(void)
1167 : {
1168 : Assert(PqCommReadingMsg);
1169 :
1170 2059602 : PqCommReadingMsg = false;
1171 2059602 : }
1172 :
1173 : /* --------------------------------
1174 : * pq_is_reading_msg - are we currently reading a message?
1175 : *
1176 : * This is used in error recovery at the outer idle loop to detect if we have
1177 : * lost protocol sync, and need to terminate the connection. pq_startmsgread()
1178 : * will check for that too, but it's nicer to detect it earlier.
1179 : * --------------------------------
1180 : */
1181 : bool
1182 42638 : pq_is_reading_msg(void)
1183 : {
1184 42638 : return PqCommReadingMsg;
1185 : }
1186 :
1187 : /* --------------------------------
1188 : * pq_getmessage - get a message with length word from connection
1189 : *
1190 : * The return value is placed in an expansible StringInfo, which has
1191 : * already been initialized by the caller.
1192 : * Only the message body is placed in the StringInfo; the length word
1193 : * is removed. Also, s->cursor is initialized to zero for convenience
1194 : * in scanning the message contents.
1195 : *
1196 : * maxlen is the upper limit on the length of the
1197 : * message we are willing to accept. We abort the connection (by
1198 : * returning EOF) if client tries to send more than that.
1199 : *
1200 : * returns 0 if OK, EOF if trouble
1201 : * --------------------------------
1202 : */
1203 : int
1204 1201404 : pq_getmessage(StringInfo s, int maxlen)
1205 : {
1206 : int32 len;
1207 :
1208 : Assert(PqCommReadingMsg);
1209 :
1210 1201404 : resetStringInfo(s);
1211 :
1212 : /* Read message length word */
1213 1201404 : if (pq_getbytes(&len, 4) == EOF)
1214 : {
1215 0 : ereport(COMMERROR,
1216 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1217 : errmsg("unexpected EOF within message length word")));
1218 0 : return EOF;
1219 : }
1220 :
1221 1201404 : len = pg_ntoh32(len);
1222 :
1223 1201404 : if (len < 4 || len > maxlen)
1224 : {
1225 0 : ereport(COMMERROR,
1226 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1227 : errmsg("invalid message length")));
1228 0 : return EOF;
1229 : }
1230 :
1231 1201404 : len -= 4; /* discount length itself */
1232 :
1233 1201404 : if (len > 0)
1234 : {
1235 : /*
1236 : * Allocate space for message. If we run out of room (ridiculously
1237 : * large message), we will elog(ERROR), but we want to discard the
1238 : * message body so as not to lose communication sync.
1239 : */
1240 1150766 : PG_TRY();
1241 : {
1242 1150766 : enlargeStringInfo(s, len);
1243 : }
1244 0 : PG_CATCH();
1245 : {
1246 0 : if (pq_discardbytes(len) == EOF)
1247 0 : ereport(COMMERROR,
1248 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1249 : errmsg("incomplete message from client")));
1250 :
1251 : /* we discarded the rest of the message so we're back in sync. */
1252 0 : PqCommReadingMsg = false;
1253 0 : PG_RE_THROW();
1254 : }
1255 1150766 : PG_END_TRY();
1256 :
1257 : /* And grab the message */
1258 1150766 : if (pq_getbytes(s->data, len) == EOF)
1259 : {
1260 0 : ereport(COMMERROR,
1261 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1262 : errmsg("incomplete message from client")));
1263 0 : return EOF;
1264 : }
1265 1150766 : s->len = len;
1266 : /* Place a trailing null per StringInfo convention */
1267 1150766 : s->data[len] = '\0';
1268 : }
1269 :
1270 : /* finished reading the message. */
1271 1201404 : PqCommReadingMsg = false;
1272 :
1273 1201404 : return 0;
1274 : }
1275 :
1276 :
1277 : static inline int
1278 41511132 : internal_putbytes(const void *b, size_t len)
1279 : {
1280 41511132 : const char *s = b;
1281 :
1282 83353372 : while (len > 0)
1283 : {
1284 : /* If buffer is full, then flush it out */
1285 41842248 : if (PqSendPointer >= PqSendBufferSize)
1286 : {
1287 389192 : socket_set_nonblocking(false);
1288 389192 : if (internal_flush())
1289 8 : return EOF;
1290 : }
1291 :
1292 : /*
1293 : * If the buffer is empty and data length is larger than the buffer
1294 : * size, send it without buffering. Otherwise, copy as much data as
1295 : * possible into the buffer.
1296 : */
1297 41842240 : if (len >= PqSendBufferSize && PqSendStart == PqSendPointer)
1298 213828 : {
1299 213828 : size_t start = 0;
1300 :
1301 213828 : socket_set_nonblocking(false);
1302 213828 : if (internal_flush_buffer(s, &start, &len))
1303 0 : return EOF;
1304 : }
1305 : else
1306 : {
1307 41628412 : size_t amount = PqSendBufferSize - PqSendPointer;
1308 :
1309 41628412 : if (amount > len)
1310 41063176 : amount = len;
1311 41628412 : memcpy(PqSendBuffer + PqSendPointer, s, amount);
1312 41628412 : PqSendPointer += amount;
1313 41628412 : s += amount;
1314 41628412 : len -= amount;
1315 : }
1316 : }
1317 :
1318 41511124 : return 0;
1319 : }
1320 :
1321 : /* --------------------------------
1322 : * socket_flush - flush pending output
1323 : *
1324 : * returns 0 if OK, EOF if trouble
1325 : * --------------------------------
1326 : */
1327 : static int
1328 840684 : socket_flush(void)
1329 : {
1330 : int res;
1331 :
1332 : /* No-op if reentrant call */
1333 840684 : if (PqCommBusy)
1334 0 : return 0;
1335 840684 : PqCommBusy = true;
1336 840684 : socket_set_nonblocking(false);
1337 840684 : res = internal_flush();
1338 840684 : PqCommBusy = false;
1339 840684 : return res;
1340 : }
1341 :
1342 : /* --------------------------------
1343 : * internal_flush - flush pending output
1344 : *
1345 : * Returns 0 if OK (meaning everything was sent, or operation would block
1346 : * and the socket is in non-blocking mode), or EOF if trouble.
1347 : * --------------------------------
1348 : */
1349 : static inline int
1350 1863628 : internal_flush(void)
1351 : {
1352 1863628 : return internal_flush_buffer(PqSendBuffer, &PqSendStart, &PqSendPointer);
1353 : }
1354 :
1355 : /* --------------------------------
1356 : * internal_flush_buffer - flush the given buffer content
1357 : *
1358 : * Returns 0 if OK (meaning everything was sent, or operation would block
1359 : * and the socket is in non-blocking mode), or EOF if trouble.
1360 : * --------------------------------
1361 : */
1362 : static pg_noinline int
1363 2077456 : internal_flush_buffer(const char *buf, size_t *start, size_t *end)
1364 : {
1365 : static int last_reported_send_errno = 0;
1366 :
1367 2077456 : const char *bufptr = buf + *start;
1368 2077456 : const char *bufend = buf + *end;
1369 :
1370 4123240 : while (bufptr < bufend)
1371 : {
1372 : int r;
1373 :
1374 2115036 : r = secure_write(MyProcPort, bufptr, bufend - bufptr);
1375 :
1376 2115036 : if (r <= 0)
1377 : {
1378 69252 : if (errno == EINTR)
1379 0 : continue; /* Ok if we were interrupted */
1380 :
1381 : /*
1382 : * Ok if no data writable without blocking, and the socket is in
1383 : * non-blocking mode.
1384 : */
1385 69252 : if (errno == EAGAIN ||
1386 66 : errno == EWOULDBLOCK)
1387 : {
1388 69186 : return 0;
1389 : }
1390 :
1391 : /*
1392 : * Careful: an ereport() that tries to write to the client would
1393 : * cause recursion to here, leading to stack overflow and core
1394 : * dump! This message must go *only* to the postmaster log.
1395 : *
1396 : * If a client disconnects while we're in the midst of output, we
1397 : * might write quite a bit of data before we get to a safe query
1398 : * abort point. So, suppress duplicate log messages.
1399 : */
1400 66 : if (errno != last_reported_send_errno)
1401 : {
1402 66 : last_reported_send_errno = errno;
1403 66 : ereport(COMMERROR,
1404 : (errcode_for_socket_access(),
1405 : errmsg("could not send data to client: %m")));
1406 : }
1407 :
1408 : /*
1409 : * We drop the buffered data anyway so that processing can
1410 : * continue, even though we'll probably quit soon. We also set a
1411 : * flag that'll cause the next CHECK_FOR_INTERRUPTS to terminate
1412 : * the connection.
1413 : */
1414 66 : *start = *end = 0;
1415 66 : ClientConnectionLost = 1;
1416 66 : InterruptPending = 1;
1417 66 : return EOF;
1418 : }
1419 :
1420 2045784 : last_reported_send_errno = 0; /* reset after any successful send */
1421 2045784 : bufptr += r;
1422 2045784 : *start += r;
1423 : }
1424 :
1425 2008204 : *start = *end = 0;
1426 2008204 : return 0;
1427 : }
1428 :
1429 : /* --------------------------------
1430 : * pq_flush_if_writable - flush pending output if writable without blocking
1431 : *
1432 : * Returns 0 if OK, or EOF if trouble.
1433 : * --------------------------------
1434 : */
1435 : static int
1436 2365742 : socket_flush_if_writable(void)
1437 : {
1438 : int res;
1439 :
1440 : /* Quick exit if nothing to do */
1441 2365742 : if (PqSendPointer == PqSendStart)
1442 1731990 : return 0;
1443 :
1444 : /* No-op if reentrant call */
1445 633752 : if (PqCommBusy)
1446 0 : return 0;
1447 :
1448 : /* Temporarily put the socket into non-blocking mode */
1449 633752 : socket_set_nonblocking(true);
1450 :
1451 633752 : PqCommBusy = true;
1452 633752 : res = internal_flush();
1453 633752 : PqCommBusy = false;
1454 633752 : return res;
1455 : }
1456 :
1457 : /* --------------------------------
1458 : * socket_is_send_pending - is there any pending data in the output buffer?
1459 : * --------------------------------
1460 : */
1461 : static bool
1462 4510614 : socket_is_send_pending(void)
1463 : {
1464 4510614 : return (PqSendStart < PqSendPointer);
1465 : }
1466 :
1467 : /* --------------------------------
1468 : * Message-level I/O routines begin here.
1469 : * --------------------------------
1470 : */
1471 :
1472 :
1473 : /* --------------------------------
1474 : * socket_putmessage - send a normal message (suppressed in COPY OUT mode)
1475 : *
1476 : * msgtype is a message type code to place before the message body.
1477 : *
1478 : * len is the length of the message body data at *s. A message length
1479 : * word (equal to len+4 because it counts itself too) is inserted by this
1480 : * routine.
1481 : *
1482 : * We suppress messages generated while pqcomm.c is busy. This
1483 : * avoids any possibility of messages being inserted within other
1484 : * messages. The only known trouble case arises if SIGQUIT occurs
1485 : * during a pqcomm.c routine --- quickdie() will try to send a warning
1486 : * message, and the most reasonable approach seems to be to drop it.
1487 : *
1488 : * returns 0 if OK, EOF if trouble
1489 : * --------------------------------
1490 : */
1491 : static int
1492 13837044 : socket_putmessage(char msgtype, const char *s, size_t len)
1493 : {
1494 : uint32 n32;
1495 :
1496 : Assert(msgtype != 0);
1497 :
1498 13837044 : if (PqCommBusy)
1499 0 : return 0;
1500 13837044 : PqCommBusy = true;
1501 13837044 : if (internal_putbytes(&msgtype, 1))
1502 0 : goto fail;
1503 :
1504 13837044 : n32 = pg_hton32((uint32) (len + 4));
1505 13837044 : if (internal_putbytes(&n32, 4))
1506 0 : goto fail;
1507 :
1508 13837044 : if (internal_putbytes(s, len))
1509 8 : goto fail;
1510 13837036 : PqCommBusy = false;
1511 13837036 : return 0;
1512 :
1513 8 : fail:
1514 8 : PqCommBusy = false;
1515 8 : return EOF;
1516 : }
1517 :
1518 : /* --------------------------------
1519 : * pq_putmessage_noblock - like pq_putmessage, but never blocks
1520 : *
1521 : * If the output buffer is too small to hold the message, the buffer
1522 : * is enlarged.
1523 : */
1524 : static void
1525 564424 : socket_putmessage_noblock(char msgtype, const char *s, size_t len)
1526 : {
1527 : int res PG_USED_FOR_ASSERTS_ONLY;
1528 : int required;
1529 :
1530 : /*
1531 : * Ensure we have enough space in the output buffer for the message header
1532 : * as well as the message itself.
1533 : */
1534 564424 : required = PqSendPointer + 1 + 4 + len;
1535 564424 : if (required > PqSendBufferSize)
1536 : {
1537 966 : PqSendBuffer = repalloc(PqSendBuffer, required);
1538 966 : PqSendBufferSize = required;
1539 : }
1540 564424 : res = pq_putmessage(msgtype, s, len);
1541 : Assert(res == 0); /* should not fail when the message fits in
1542 : * buffer */
1543 564424 : }
1544 :
1545 : /* --------------------------------
1546 : * pq_putmessage_v2 - send a message in protocol version 2
1547 : *
1548 : * msgtype is a message type code to place before the message body.
1549 : *
1550 : * We no longer support protocol version 2, but we have kept this
1551 : * function so that if a client tries to connect with protocol version 2,
1552 : * as a courtesy we can still send the "unsupported protocol version"
1553 : * error to the client in the old format.
1554 : *
1555 : * Like in pq_putmessage(), we suppress messages generated while
1556 : * pqcomm.c is busy.
1557 : *
1558 : * returns 0 if OK, EOF if trouble
1559 : * --------------------------------
1560 : */
1561 : int
1562 0 : pq_putmessage_v2(char msgtype, const char *s, size_t len)
1563 : {
1564 : Assert(msgtype != 0);
1565 :
1566 0 : if (PqCommBusy)
1567 0 : return 0;
1568 0 : PqCommBusy = true;
1569 0 : if (internal_putbytes(&msgtype, 1))
1570 0 : goto fail;
1571 :
1572 0 : if (internal_putbytes(s, len))
1573 0 : goto fail;
1574 0 : PqCommBusy = false;
1575 0 : return 0;
1576 :
1577 0 : fail:
1578 0 : PqCommBusy = false;
1579 0 : return EOF;
1580 : }
1581 :
1582 : /*
1583 : * Support for TCP Keepalive parameters
1584 : */
1585 :
1586 : /*
1587 : * On Windows, we need to set both idle and interval at the same time.
1588 : * We also cannot reset them to the default (setting to zero will
1589 : * actually set them to zero, not default), therefore we fallback to
1590 : * the out-of-the-box default instead.
1591 : */
1592 : #if defined(WIN32) && defined(SIO_KEEPALIVE_VALS)
1593 : static int
1594 : pq_setkeepaliveswin32(Port *port, int idle, int interval)
1595 : {
1596 : struct tcp_keepalive ka;
1597 : DWORD retsize;
1598 :
1599 : if (idle <= 0)
1600 : idle = 2 * 60 * 60; /* default = 2 hours */
1601 : if (interval <= 0)
1602 : interval = 1; /* default = 1 second */
1603 :
1604 : ka.onoff = 1;
1605 : ka.keepalivetime = idle * 1000;
1606 : ka.keepaliveinterval = interval * 1000;
1607 :
1608 : if (WSAIoctl(port->sock,
1609 : SIO_KEEPALIVE_VALS,
1610 : (LPVOID) &ka,
1611 : sizeof(ka),
1612 : NULL,
1613 : 0,
1614 : &retsize,
1615 : NULL,
1616 : NULL)
1617 : != 0)
1618 : {
1619 : ereport(LOG,
1620 : (errmsg("%s(%s) failed: error code %d",
1621 : "WSAIoctl", "SIO_KEEPALIVE_VALS", WSAGetLastError())));
1622 : return STATUS_ERROR;
1623 : }
1624 : if (port->keepalives_idle != idle)
1625 : port->keepalives_idle = idle;
1626 : if (port->keepalives_interval != interval)
1627 : port->keepalives_interval = interval;
1628 : return STATUS_OK;
1629 : }
1630 : #endif
1631 :
1632 : int
1633 3480 : pq_getkeepalivesidle(Port *port)
1634 : {
1635 : #if defined(PG_TCP_KEEPALIVE_IDLE) || defined(SIO_KEEPALIVE_VALS)
1636 3480 : if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1637 3480 : return 0;
1638 :
1639 0 : if (port->keepalives_idle != 0)
1640 0 : return port->keepalives_idle;
1641 :
1642 0 : if (port->default_keepalives_idle == 0)
1643 : {
1644 : #ifndef WIN32
1645 0 : socklen_t size = sizeof(port->default_keepalives_idle);
1646 :
1647 0 : if (getsockopt(port->sock, IPPROTO_TCP, PG_TCP_KEEPALIVE_IDLE,
1648 0 : (char *) &port->default_keepalives_idle,
1649 : &size) < 0)
1650 : {
1651 0 : ereport(LOG,
1652 : (errmsg("%s(%s) failed: %m", "getsockopt", PG_TCP_KEEPALIVE_IDLE_STR)));
1653 0 : port->default_keepalives_idle = -1; /* don't know */
1654 : }
1655 : #else /* WIN32 */
1656 : /* We can't get the defaults on Windows, so return "don't know" */
1657 : port->default_keepalives_idle = -1;
1658 : #endif /* WIN32 */
1659 : }
1660 :
1661 0 : return port->default_keepalives_idle;
1662 : #else
1663 : return 0;
1664 : #endif
1665 : }
1666 :
1667 : int
1668 2674 : pq_setkeepalivesidle(int idle, Port *port)
1669 : {
1670 2674 : if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1671 2098 : return STATUS_OK;
1672 :
1673 : /* check SIO_KEEPALIVE_VALS here, not just WIN32, as some toolchains lack it */
1674 : #if defined(PG_TCP_KEEPALIVE_IDLE) || defined(SIO_KEEPALIVE_VALS)
1675 576 : if (idle == port->keepalives_idle)
1676 576 : return STATUS_OK;
1677 :
1678 : #ifndef WIN32
1679 0 : if (port->default_keepalives_idle <= 0)
1680 : {
1681 0 : if (pq_getkeepalivesidle(port) < 0)
1682 : {
1683 0 : if (idle == 0)
1684 0 : return STATUS_OK; /* default is set but unknown */
1685 : else
1686 0 : return STATUS_ERROR;
1687 : }
1688 : }
1689 :
1690 0 : if (idle == 0)
1691 0 : idle = port->default_keepalives_idle;
1692 :
1693 0 : if (setsockopt(port->sock, IPPROTO_TCP, PG_TCP_KEEPALIVE_IDLE,
1694 : (char *) &idle, sizeof(idle)) < 0)
1695 : {
1696 0 : ereport(LOG,
1697 : (errmsg("%s(%s) failed: %m", "setsockopt", PG_TCP_KEEPALIVE_IDLE_STR)));
1698 0 : return STATUS_ERROR;
1699 : }
1700 :
1701 0 : port->keepalives_idle = idle;
1702 : #else /* WIN32 */
1703 : return pq_setkeepaliveswin32(port, idle, port->keepalives_interval);
1704 : #endif
1705 : #else
1706 : if (idle != 0)
1707 : {
1708 : ereport(LOG,
1709 : (errmsg("setting the keepalive idle time is not supported")));
1710 : return STATUS_ERROR;
1711 : }
1712 : #endif
1713 :
1714 0 : return STATUS_OK;
1715 : }
1716 :
1717 : int
1718 3480 : pq_getkeepalivesinterval(Port *port)
1719 : {
1720 : #if defined(TCP_KEEPINTVL) || defined(SIO_KEEPALIVE_VALS)
1721 3480 : if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1722 3480 : return 0;
1723 :
1724 0 : if (port->keepalives_interval != 0)
1725 0 : return port->keepalives_interval;
1726 :
1727 0 : if (port->default_keepalives_interval == 0)
1728 : {
1729 : #ifndef WIN32
1730 0 : socklen_t size = sizeof(port->default_keepalives_interval);
1731 :
1732 0 : if (getsockopt(port->sock, IPPROTO_TCP, TCP_KEEPINTVL,
1733 0 : (char *) &port->default_keepalives_interval,
1734 : &size) < 0)
1735 : {
1736 0 : ereport(LOG,
1737 : (errmsg("%s(%s) failed: %m", "getsockopt", "TCP_KEEPINTVL")));
1738 0 : port->default_keepalives_interval = -1; /* don't know */
1739 : }
1740 : #else
1741 : /* We can't get the defaults on Windows, so return "don't know" */
1742 : port->default_keepalives_interval = -1;
1743 : #endif /* WIN32 */
1744 : }
1745 :
1746 0 : return port->default_keepalives_interval;
1747 : #else
1748 : return 0;
1749 : #endif
1750 : }
1751 :
1752 : int
1753 2674 : pq_setkeepalivesinterval(int interval, Port *port)
1754 : {
1755 2674 : if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1756 2098 : return STATUS_OK;
1757 :
1758 : #if defined(TCP_KEEPINTVL) || defined(SIO_KEEPALIVE_VALS)
1759 576 : if (interval == port->keepalives_interval)
1760 576 : return STATUS_OK;
1761 :
1762 : #ifndef WIN32
1763 0 : if (port->default_keepalives_interval <= 0)
1764 : {
1765 0 : if (pq_getkeepalivesinterval(port) < 0)
1766 : {
1767 0 : if (interval == 0)
1768 0 : return STATUS_OK; /* default is set but unknown */
1769 : else
1770 0 : return STATUS_ERROR;
1771 : }
1772 : }
1773 :
1774 0 : if (interval == 0)
1775 0 : interval = port->default_keepalives_interval;
1776 :
1777 0 : if (setsockopt(port->sock, IPPROTO_TCP, TCP_KEEPINTVL,
1778 : (char *) &interval, sizeof(interval)) < 0)
1779 : {
1780 0 : ereport(LOG,
1781 : (errmsg("%s(%s) failed: %m", "setsockopt", "TCP_KEEPINTVL")));
1782 0 : return STATUS_ERROR;
1783 : }
1784 :
1785 0 : port->keepalives_interval = interval;
1786 : #else /* WIN32 */
1787 : return pq_setkeepaliveswin32(port, port->keepalives_idle, interval);
1788 : #endif
1789 : #else
1790 : if (interval != 0)
1791 : {
1792 : ereport(LOG,
1793 : (errmsg("%s(%s) not supported", "setsockopt", "TCP_KEEPINTVL")));
1794 : return STATUS_ERROR;
1795 : }
1796 : #endif
1797 :
1798 0 : return STATUS_OK;
1799 : }
1800 :
1801 : int
1802 3480 : pq_getkeepalivescount(Port *port)
1803 : {
1804 : #ifdef TCP_KEEPCNT
1805 3480 : if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1806 3480 : return 0;
1807 :
1808 0 : if (port->keepalives_count != 0)
1809 0 : return port->keepalives_count;
1810 :
1811 0 : if (port->default_keepalives_count == 0)
1812 : {
1813 0 : socklen_t size = sizeof(port->default_keepalives_count);
1814 :
1815 0 : if (getsockopt(port->sock, IPPROTO_TCP, TCP_KEEPCNT,
1816 0 : (char *) &port->default_keepalives_count,
1817 : &size) < 0)
1818 : {
1819 0 : ereport(LOG,
1820 : (errmsg("%s(%s) failed: %m", "getsockopt", "TCP_KEEPCNT")));
1821 0 : port->default_keepalives_count = -1; /* don't know */
1822 : }
1823 : }
1824 :
1825 0 : return port->default_keepalives_count;
1826 : #else
1827 : return 0;
1828 : #endif
1829 : }
1830 :
1831 : int
1832 2674 : pq_setkeepalivescount(int count, Port *port)
1833 : {
1834 2674 : if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1835 2098 : return STATUS_OK;
1836 :
1837 : #ifdef TCP_KEEPCNT
1838 576 : if (count == port->keepalives_count)
1839 576 : return STATUS_OK;
1840 :
1841 0 : if (port->default_keepalives_count <= 0)
1842 : {
1843 0 : if (pq_getkeepalivescount(port) < 0)
1844 : {
1845 0 : if (count == 0)
1846 0 : return STATUS_OK; /* default is set but unknown */
1847 : else
1848 0 : return STATUS_ERROR;
1849 : }
1850 : }
1851 :
1852 0 : if (count == 0)
1853 0 : count = port->default_keepalives_count;
1854 :
1855 0 : if (setsockopt(port->sock, IPPROTO_TCP, TCP_KEEPCNT,
1856 : (char *) &count, sizeof(count)) < 0)
1857 : {
1858 0 : ereport(LOG,
1859 : (errmsg("%s(%s) failed: %m", "setsockopt", "TCP_KEEPCNT")));
1860 0 : return STATUS_ERROR;
1861 : }
1862 :
1863 0 : port->keepalives_count = count;
1864 : #else
1865 : if (count != 0)
1866 : {
1867 : ereport(LOG,
1868 : (errmsg("%s(%s) not supported", "setsockopt", "TCP_KEEPCNT")));
1869 : return STATUS_ERROR;
1870 : }
1871 : #endif
1872 :
1873 0 : return STATUS_OK;
1874 : }
1875 :
1876 : int
1877 3480 : pq_gettcpusertimeout(Port *port)
1878 : {
1879 : #ifdef TCP_USER_TIMEOUT
1880 3480 : if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1881 3480 : return 0;
1882 :
1883 0 : if (port->tcp_user_timeout != 0)
1884 0 : return port->tcp_user_timeout;
1885 :
1886 0 : if (port->default_tcp_user_timeout == 0)
1887 : {
1888 0 : socklen_t size = sizeof(port->default_tcp_user_timeout);
1889 :
1890 0 : if (getsockopt(port->sock, IPPROTO_TCP, TCP_USER_TIMEOUT,
1891 0 : (char *) &port->default_tcp_user_timeout,
1892 : &size) < 0)
1893 : {
1894 0 : ereport(LOG,
1895 : (errmsg("%s(%s) failed: %m", "getsockopt", "TCP_USER_TIMEOUT")));
1896 0 : port->default_tcp_user_timeout = -1; /* don't know */
1897 : }
1898 : }
1899 :
1900 0 : return port->default_tcp_user_timeout;
1901 : #else
1902 : return 0;
1903 : #endif
1904 : }
1905 :
1906 : int
1907 2674 : pq_settcpusertimeout(int timeout, Port *port)
1908 : {
1909 2674 : if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1910 2098 : return STATUS_OK;
1911 :
1912 : #ifdef TCP_USER_TIMEOUT
1913 576 : if (timeout == port->tcp_user_timeout)
1914 576 : return STATUS_OK;
1915 :
1916 0 : if (port->default_tcp_user_timeout <= 0)
1917 : {
1918 0 : if (pq_gettcpusertimeout(port) < 0)
1919 : {
1920 0 : if (timeout == 0)
1921 0 : return STATUS_OK; /* default is set but unknown */
1922 : else
1923 0 : return STATUS_ERROR;
1924 : }
1925 : }
1926 :
1927 0 : if (timeout == 0)
1928 0 : timeout = port->default_tcp_user_timeout;
1929 :
1930 0 : if (setsockopt(port->sock, IPPROTO_TCP, TCP_USER_TIMEOUT,
1931 : (char *) &timeout, sizeof(timeout)) < 0)
1932 : {
1933 0 : ereport(LOG,
1934 : (errmsg("%s(%s) failed: %m", "setsockopt", "TCP_USER_TIMEOUT")));
1935 0 : return STATUS_ERROR;
1936 : }
1937 :
1938 0 : port->tcp_user_timeout = timeout;
1939 : #else
1940 : if (timeout != 0)
1941 : {
1942 : ereport(LOG,
1943 : (errmsg("%s(%s) not supported", "setsockopt", "TCP_USER_TIMEOUT")));
1944 : return STATUS_ERROR;
1945 : }
1946 : #endif
1947 :
1948 0 : return STATUS_OK;
1949 : }
1950 :
1951 : /*
1952 : * GUC assign_hook for tcp_keepalives_idle
1953 : */
1954 : void
1955 2098 : assign_tcp_keepalives_idle(int newval, void *extra)
1956 : {
1957 : /*
1958 : * The kernel API provides no way to test a value without setting it; and
1959 : * once we set it we might fail to unset it. So there seems little point
1960 : * in fully implementing the check-then-assign GUC API for these
1961 : * variables. Instead we just do the assignment on demand.
1962 : * pq_setkeepalivesidle reports any problems via ereport(LOG).
1963 : *
1964 : * This approach means that the GUC value might have little to do with the
1965 : * actual kernel value, so we use a show_hook that retrieves the kernel
1966 : * value rather than trusting GUC's copy.
1967 : */
1968 2098 : (void) pq_setkeepalivesidle(newval, MyProcPort);
1969 2098 : }
1970 :
1971 : /*
1972 : * GUC show_hook for tcp_keepalives_idle
1973 : */
1974 : const char *
1975 3480 : show_tcp_keepalives_idle(void)
1976 : {
1977 : /* See comments in assign_tcp_keepalives_idle */
1978 : static char nbuf[16];
1979 :
1980 3480 : snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivesidle(MyProcPort));
1981 3480 : return nbuf;
1982 : }
1983 :
1984 : /*
1985 : * GUC assign_hook for tcp_keepalives_interval
1986 : */
1987 : void
1988 2098 : assign_tcp_keepalives_interval(int newval, void *extra)
1989 : {
1990 : /* See comments in assign_tcp_keepalives_idle */
1991 2098 : (void) pq_setkeepalivesinterval(newval, MyProcPort);
1992 2098 : }
1993 :
1994 : /*
1995 : * GUC show_hook for tcp_keepalives_interval
1996 : */
1997 : const char *
1998 3480 : show_tcp_keepalives_interval(void)
1999 : {
2000 : /* See comments in assign_tcp_keepalives_idle */
2001 : static char nbuf[16];
2002 :
2003 3480 : snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivesinterval(MyProcPort));
2004 3480 : return nbuf;
2005 : }
2006 :
2007 : /*
2008 : * GUC assign_hook for tcp_keepalives_count
2009 : */
2010 : void
2011 2098 : assign_tcp_keepalives_count(int newval, void *extra)
2012 : {
2013 : /* See comments in assign_tcp_keepalives_idle */
2014 2098 : (void) pq_setkeepalivescount(newval, MyProcPort);
2015 2098 : }
2016 :
2017 : /*
2018 : * GUC show_hook for tcp_keepalives_count
2019 : */
2020 : const char *
2021 3480 : show_tcp_keepalives_count(void)
2022 : {
2023 : /* See comments in assign_tcp_keepalives_idle */
2024 : static char nbuf[16];
2025 :
2026 3480 : snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivescount(MyProcPort));
2027 3480 : return nbuf;
2028 : }
2029 :
2030 : /*
2031 : * GUC assign_hook for tcp_user_timeout
2032 : */
2033 : void
2034 2098 : assign_tcp_user_timeout(int newval, void *extra)
2035 : {
2036 : /* See comments in assign_tcp_keepalives_idle */
2037 2098 : (void) pq_settcpusertimeout(newval, MyProcPort);
2038 2098 : }
2039 :
2040 : /*
2041 : * GUC show_hook for tcp_user_timeout
2042 : */
2043 : const char *
2044 3480 : show_tcp_user_timeout(void)
2045 : {
2046 : /* See comments in assign_tcp_keepalives_idle */
2047 : static char nbuf[16];
2048 :
2049 3480 : snprintf(nbuf, sizeof(nbuf), "%d", pq_gettcpusertimeout(MyProcPort));
2050 3480 : return nbuf;
2051 : }
2052 :
2053 : /*
2054 : * Check if the client is still connected.
2055 : */
2056 : bool
2057 0 : pq_check_connection(void)
2058 : {
2059 : WaitEvent events[FeBeWaitSetNEvents];
2060 : int rc;
2061 :
2062 : /*
2063 : * It's OK to modify the socket event filter without restoring, because
2064 : * all FeBeWaitSet socket wait sites do the same.
2065 : */
2066 0 : ModifyWaitEvent(FeBeWaitSet, FeBeWaitSetSocketPos, WL_SOCKET_CLOSED, NULL);
2067 :
2068 0 : retry:
2069 0 : rc = WaitEventSetWait(FeBeWaitSet, 0, events, lengthof(events), 0);
2070 0 : for (int i = 0; i < rc; ++i)
2071 : {
2072 0 : if (events[i].events & WL_SOCKET_CLOSED)
2073 0 : return false;
2074 0 : if (events[i].events & WL_LATCH_SET)
2075 : {
2076 : /*
2077 : * A latch event might be preventing other events from being
2078 : * reported. Reset it and poll again. No need to restore it
2079 : * because no code should expect latches to survive across
2080 : * CHECK_FOR_INTERRUPTS().
2081 : */
2082 0 : ResetLatch(MyLatch);
2083 0 : goto retry;
2084 : }
2085 : }
2086 :
2087 0 : return true;
2088 : }
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