PostgreSQL Source Code  git master
pqcomm.c File Reference
#include "postgres.h"
#include <signal.h>
#include <fcntl.h>
#include <grp.h>
#include <unistd.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <netdb.h>
#include <netinet/in.h>
#include "common/ip.h"
#include "libpq/libpq.h"
#include "miscadmin.h"
#include "port/pg_bswap.h"
#include "storage/ipc.h"
#include "utils/guc.h"
#include "utils/memutils.h"
Include dependency graph for pqcomm.c:

Go to the source code of this file.

Macros

#define PQ_SEND_BUFFER_SIZE   8192
 
#define PQ_RECV_BUFFER_SIZE   8192
 

Functions

static void socket_comm_reset (void)
 
static void socket_close (int code, Datum arg)
 
static void socket_set_nonblocking (bool nonblocking)
 
static int socket_flush (void)
 
static int socket_flush_if_writable (void)
 
static bool socket_is_send_pending (void)
 
static int socket_putmessage (char msgtype, const char *s, size_t len)
 
static void socket_putmessage_noblock (char msgtype, const char *s, size_t len)
 
static void socket_startcopyout (void)
 
static void socket_endcopyout (bool errorAbort)
 
static int internal_putbytes (const char *s, size_t len)
 
static int internal_flush (void)
 
void pq_init (void)
 
int StreamServerPort (int family, char *hostName, unsigned short portNumber, char *unixSocketDir, pgsocket ListenSocket[], int MaxListen)
 
int StreamConnection (pgsocket server_fd, Port *port)
 
void StreamClose (pgsocket sock)
 
void TouchSocketFiles (void)
 
void RemoveSocketFiles (void)
 
static int pq_recvbuf (void)
 
int pq_getbyte (void)
 
int pq_peekbyte (void)
 
int pq_getbyte_if_available (unsigned char *c)
 
int pq_getbytes (char *s, size_t len)
 
static int pq_discardbytes (size_t len)
 
int pq_getstring (StringInfo s)
 
void pq_startmsgread (void)
 
void pq_endmsgread (void)
 
bool pq_is_reading_msg (void)
 
int pq_getmessage (StringInfo s, int maxlen)
 
int pq_putbytes (const char *s, size_t len)
 
int pq_getkeepalivesidle (Port *port)
 
int pq_setkeepalivesidle (int idle, Port *port)
 
int pq_getkeepalivesinterval (Port *port)
 
int pq_setkeepalivesinterval (int interval, Port *port)
 
int pq_getkeepalivescount (Port *port)
 
int pq_setkeepalivescount (int count, Port *port)
 

Variables

int Unix_socket_permissions
 
char * Unix_socket_group
 
static Listsock_paths = NIL
 
static char * PqSendBuffer
 
static int PqSendBufferSize
 
static int PqSendPointer
 
static int PqSendStart
 
static char PqRecvBuffer [PQ_RECV_BUFFER_SIZE]
 
static int PqRecvPointer
 
static int PqRecvLength
 
static bool PqCommBusy
 
static bool PqCommReadingMsg
 
static bool DoingCopyOut
 
static PQcommMethods PqCommSocketMethods
 
PQcommMethodsPqCommMethods = &PqCommSocketMethods
 
WaitEventSetFeBeWaitSet
 

Macro Definition Documentation

◆ PQ_RECV_BUFFER_SIZE

#define PQ_RECV_BUFFER_SIZE   8192

Definition at line 135 of file pqcomm.c.

Referenced by pq_recvbuf().

◆ PQ_SEND_BUFFER_SIZE

#define PQ_SEND_BUFFER_SIZE   8192

Definition at line 134 of file pqcomm.c.

Referenced by pq_init(), and StreamConnection().

Function Documentation

◆ internal_flush()

static int internal_flush ( void  )
static

Definition at line 1422 of file pqcomm.c.

References ClientConnectionLost, COMMERROR, EAGAIN, EINTR, ereport, errcode_for_socket_access(), errmsg(), EWOULDBLOCK, InterruptPending, MyProcPort, PqSendBuffer, PqSendPointer, PqSendStart, and secure_write().

Referenced by internal_putbytes(), socket_flush(), and socket_flush_if_writable().

1423 {
1424  static int last_reported_send_errno = 0;
1425 
1426  char *bufptr = PqSendBuffer + PqSendStart;
1427  char *bufend = PqSendBuffer + PqSendPointer;
1428 
1429  while (bufptr < bufend)
1430  {
1431  int r;
1432 
1433  r = secure_write(MyProcPort, bufptr, bufend - bufptr);
1434 
1435  if (r <= 0)
1436  {
1437  if (errno == EINTR)
1438  continue; /* Ok if we were interrupted */
1439 
1440  /*
1441  * Ok if no data writable without blocking, and the socket is in
1442  * non-blocking mode.
1443  */
1444  if (errno == EAGAIN ||
1445  errno == EWOULDBLOCK)
1446  {
1447  return 0;
1448  }
1449 
1450  /*
1451  * Careful: an ereport() that tries to write to the client would
1452  * cause recursion to here, leading to stack overflow and core
1453  * dump! This message must go *only* to the postmaster log.
1454  *
1455  * If a client disconnects while we're in the midst of output, we
1456  * might write quite a bit of data before we get to a safe query
1457  * abort point. So, suppress duplicate log messages.
1458  */
1459  if (errno != last_reported_send_errno)
1460  {
1461  last_reported_send_errno = errno;
1464  errmsg("could not send data to client: %m")));
1465  }
1466 
1467  /*
1468  * We drop the buffered data anyway so that processing can
1469  * continue, even though we'll probably quit soon. We also set a
1470  * flag that'll cause the next CHECK_FOR_INTERRUPTS to terminate
1471  * the connection.
1472  */
1473  PqSendStart = PqSendPointer = 0;
1475  InterruptPending = 1;
1476  return EOF;
1477  }
1478 
1479  last_reported_send_errno = 0; /* reset after any successful send */
1480  bufptr += r;
1481  PqSendStart += r;
1482  }
1483 
1484  PqSendStart = PqSendPointer = 0;
1485  return 0;
1486 }
struct Port * MyProcPort
Definition: globals.c:41
#define EAGAIN
Definition: win32_port.h:332
static char * PqSendBuffer
Definition: pqcomm.c:137
static int PqSendStart
Definition: pqcomm.c:140
volatile bool ClientConnectionLost
Definition: globals.c:32
static int PqSendPointer
Definition: pqcomm.c:139
#define COMMERROR
Definition: elog.h:30
ssize_t secure_write(Port *port, void *ptr, size_t len)
Definition: be-secure.c:241
#define ereport(elevel, rest)
Definition: elog.h:122
int errcode_for_socket_access(void)
Definition: elog.c:669
volatile bool InterruptPending
Definition: globals.c:29
int errmsg(const char *fmt,...)
Definition: elog.c:797
#define EWOULDBLOCK
Definition: win32_port.h:340
#define EINTR
Definition: win32_port.h:334

◆ internal_putbytes()

static int internal_putbytes ( const char *  s,
size_t  len 
)
static

Definition at line 1369 of file pqcomm.c.

References internal_flush(), PqSendBuffer, PqSendBufferSize, PqSendPointer, and socket_set_nonblocking().

Referenced by pq_putbytes(), and socket_putmessage().

1370 {
1371  size_t amount;
1372 
1373  while (len > 0)
1374  {
1375  /* If buffer is full, then flush it out */
1377  {
1378  socket_set_nonblocking(false);
1379  if (internal_flush())
1380  return EOF;
1381  }
1382  amount = PqSendBufferSize - PqSendPointer;
1383  if (amount > len)
1384  amount = len;
1385  memcpy(PqSendBuffer + PqSendPointer, s, amount);
1386  PqSendPointer += amount;
1387  s += amount;
1388  len -= amount;
1389  }
1390  return 0;
1391 }
static char * PqSendBuffer
Definition: pqcomm.c:137
static int internal_flush(void)
Definition: pqcomm.c:1422
static void socket_set_nonblocking(bool nonblocking)
Definition: pqcomm.c:922
static int PqSendPointer
Definition: pqcomm.c:139
static int PqSendBufferSize
Definition: pqcomm.c:138

◆ pq_discardbytes()

static int pq_discardbytes ( size_t  len)
static

Definition at line 1128 of file pqcomm.c.

References Assert, pq_recvbuf(), PqCommReadingMsg, PqRecvLength, and PqRecvPointer.

Referenced by pq_getmessage().

1129 {
1130  size_t amount;
1131 
1133 
1134  while (len > 0)
1135  {
1136  while (PqRecvPointer >= PqRecvLength)
1137  {
1138  if (pq_recvbuf()) /* If nothing in buffer, then recv some */
1139  return EOF; /* Failed to recv data */
1140  }
1141  amount = PqRecvLength - PqRecvPointer;
1142  if (amount > len)
1143  amount = len;
1144  PqRecvPointer += amount;
1145  len -= amount;
1146  }
1147  return 0;
1148 }
static int PqRecvLength
Definition: pqcomm.c:144
static int pq_recvbuf(void)
Definition: pqcomm.c:939
#define Assert(condition)
Definition: c.h:670
static int PqRecvPointer
Definition: pqcomm.c:143
static bool PqCommReadingMsg
Definition: pqcomm.c:150

◆ pq_endmsgread()

void pq_endmsgread ( void  )

Definition at line 1234 of file pqcomm.c.

References Assert, and PqCommReadingMsg.

Referenced by CopyFrom(), ProcessRepliesIfAny(), ProcessStartupPacket(), and SocketBackend().

1235 {
1237 
1238  PqCommReadingMsg = false;
1239 }
#define Assert(condition)
Definition: c.h:670
static bool PqCommReadingMsg
Definition: pqcomm.c:150

◆ pq_getbyte()

int pq_getbyte ( void  )

Definition at line 1000 of file pqcomm.c.

References Assert, pq_recvbuf(), PqCommReadingMsg, PqRecvBuffer, PqRecvLength, and PqRecvPointer.

Referenced by CheckSCRAMAuth(), CopyGetData(), recv_password_packet(), and SocketBackend().

1001 {
1003 
1004  while (PqRecvPointer >= PqRecvLength)
1005  {
1006  if (pq_recvbuf()) /* If nothing in buffer, then recv some */
1007  return EOF; /* Failed to recv data */
1008  }
1009  return (unsigned char) PqRecvBuffer[PqRecvPointer++];
1010 }
static char PqRecvBuffer[PQ_RECV_BUFFER_SIZE]
Definition: pqcomm.c:142
static int PqRecvLength
Definition: pqcomm.c:144
static int pq_recvbuf(void)
Definition: pqcomm.c:939
#define Assert(condition)
Definition: c.h:670
static int PqRecvPointer
Definition: pqcomm.c:143
static bool PqCommReadingMsg
Definition: pqcomm.c:150

◆ pq_getbyte_if_available()

int pq_getbyte_if_available ( unsigned char *  c)

Definition at line 1040 of file pqcomm.c.

References Assert, COMMERROR, EAGAIN, EINTR, ereport, errcode_for_socket_access(), errmsg(), EWOULDBLOCK, MyProcPort, PqCommReadingMsg, PqRecvBuffer, PqRecvLength, PqRecvPointer, secure_read(), and socket_set_nonblocking().

Referenced by ProcessRepliesIfAny().

1041 {
1042  int r;
1043 
1045 
1047  {
1049  return 1;
1050  }
1051 
1052  /* Put the socket into non-blocking mode */
1053  socket_set_nonblocking(true);
1054 
1055  r = secure_read(MyProcPort, c, 1);
1056  if (r < 0)
1057  {
1058  /*
1059  * Ok if no data available without blocking or interrupted (though
1060  * EINTR really shouldn't happen with a non-blocking socket). Report
1061  * other errors.
1062  */
1063  if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
1064  r = 0;
1065  else
1066  {
1067  /*
1068  * Careful: an ereport() that tries to write to the client would
1069  * cause recursion to here, leading to stack overflow and core
1070  * dump! This message must go *only* to the postmaster log.
1071  */
1074  errmsg("could not receive data from client: %m")));
1075  r = EOF;
1076  }
1077  }
1078  else if (r == 0)
1079  {
1080  /* EOF detected */
1081  r = EOF;
1082  }
1083 
1084  return r;
1085 }
static char PqRecvBuffer[PQ_RECV_BUFFER_SIZE]
Definition: pqcomm.c:142
struct Port * MyProcPort
Definition: globals.c:41
#define EAGAIN
Definition: win32_port.h:332
ssize_t secure_read(Port *port, void *ptr, size_t len)
Definition: be-secure.c:138
static void socket_set_nonblocking(bool nonblocking)
Definition: pqcomm.c:922
static int PqRecvLength
Definition: pqcomm.c:144
char * c
#define COMMERROR
Definition: elog.h:30
#define ereport(elevel, rest)
Definition: elog.h:122
int errcode_for_socket_access(void)
Definition: elog.c:669
#define Assert(condition)
Definition: c.h:670
int errmsg(const char *fmt,...)
Definition: elog.c:797
static int PqRecvPointer
Definition: pqcomm.c:143
#define EWOULDBLOCK
Definition: win32_port.h:340
static bool PqCommReadingMsg
Definition: pqcomm.c:150
#define EINTR
Definition: win32_port.h:334

◆ pq_getbytes()

int pq_getbytes ( char *  s,
size_t  len 
)

Definition at line 1094 of file pqcomm.c.

References Assert, pq_recvbuf(), PqCommReadingMsg, PqRecvBuffer, PqRecvLength, and PqRecvPointer.

Referenced by CopyGetData(), GetOldFunctionMessage(), pq_getmessage(), and ProcessStartupPacket().

1095 {
1096  size_t amount;
1097 
1099 
1100  while (len > 0)
1101  {
1102  while (PqRecvPointer >= PqRecvLength)
1103  {
1104  if (pq_recvbuf()) /* If nothing in buffer, then recv some */
1105  return EOF; /* Failed to recv data */
1106  }
1107  amount = PqRecvLength - PqRecvPointer;
1108  if (amount > len)
1109  amount = len;
1110  memcpy(s, PqRecvBuffer + PqRecvPointer, amount);
1111  PqRecvPointer += amount;
1112  s += amount;
1113  len -= amount;
1114  }
1115  return 0;
1116 }
static char PqRecvBuffer[PQ_RECV_BUFFER_SIZE]
Definition: pqcomm.c:142
static int PqRecvLength
Definition: pqcomm.c:144
static int pq_recvbuf(void)
Definition: pqcomm.c:939
#define Assert(condition)
Definition: c.h:670
static int PqRecvPointer
Definition: pqcomm.c:143
static bool PqCommReadingMsg
Definition: pqcomm.c:150

◆ pq_getkeepalivescount()

int pq_getkeepalivescount ( Port port)

Definition at line 1859 of file pqcomm.c.

References SockAddr::addr, Port::default_keepalives_count, elog, IS_AF_UNIX, Port::keepalives_count, Port::laddr, LOG, and Port::sock.

Referenced by pq_setkeepalivescount(), and show_tcp_keepalives_count().

1860 {
1861 #ifdef TCP_KEEPCNT
1862  if (port == NULL || IS_AF_UNIX(port->laddr.addr.ss_family))
1863  return 0;
1864 
1865  if (port->keepalives_count != 0)
1866  return port->keepalives_count;
1867 
1868  if (port->default_keepalives_count == 0)
1869  {
1870  ACCEPT_TYPE_ARG3 size = sizeof(port->default_keepalives_count);
1871 
1872  if (getsockopt(port->sock, IPPROTO_TCP, TCP_KEEPCNT,
1873  (char *) &port->default_keepalives_count,
1874  &size) < 0)
1875  {
1876  elog(LOG, "getsockopt(%s) failed: %m", "TCP_KEEPCNT");
1877  port->default_keepalives_count = -1; /* don't know */
1878  }
1879  }
1880 
1881  return port->default_keepalives_count;
1882 #else
1883  return 0;
1884 #endif
1885 }
struct sockaddr_storage addr
Definition: pqcomm.h:64
#define LOG
Definition: elog.h:26
int default_keepalives_count
Definition: libpq-be.h:162
pgsocket sock
Definition: libpq-be.h:118
int keepalives_count
Definition: libpq-be.h:165
#define IS_AF_UNIX(fam)
Definition: ip.h:24
SockAddr laddr
Definition: libpq-be.h:121
#define elog
Definition: elog.h:219

◆ pq_getkeepalivesidle()

int pq_getkeepalivesidle ( Port port)

Definition at line 1696 of file pqcomm.c.

References SockAddr::addr, Port::default_keepalives_idle, elog, IS_AF_UNIX, Port::keepalives_idle, Port::laddr, LOG, and Port::sock.

Referenced by pq_setkeepalivesidle(), and show_tcp_keepalives_idle().

1697 {
1698 #if defined(PG_TCP_KEEPALIVE_IDLE) || defined(SIO_KEEPALIVE_VALS)
1699  if (port == NULL || IS_AF_UNIX(port->laddr.addr.ss_family))
1700  return 0;
1701 
1702  if (port->keepalives_idle != 0)
1703  return port->keepalives_idle;
1704 
1705  if (port->default_keepalives_idle == 0)
1706  {
1707 #ifndef WIN32
1708  ACCEPT_TYPE_ARG3 size = sizeof(port->default_keepalives_idle);
1709 
1710  if (getsockopt(port->sock, IPPROTO_TCP, PG_TCP_KEEPALIVE_IDLE,
1711  (char *) &port->default_keepalives_idle,
1712  &size) < 0)
1713  {
1714  elog(LOG, "getsockopt(%s) failed: %m", PG_TCP_KEEPALIVE_IDLE_STR);
1715  port->default_keepalives_idle = -1; /* don't know */
1716  }
1717 #else /* WIN32 */
1718  /* We can't get the defaults on Windows, so return "don't know" */
1719  port->default_keepalives_idle = -1;
1720 #endif /* WIN32 */
1721  }
1722 
1723  return port->default_keepalives_idle;
1724 #else
1725  return 0;
1726 #endif
1727 }
int keepalives_idle
Definition: libpq-be.h:163
struct sockaddr_storage addr
Definition: pqcomm.h:64
#define LOG
Definition: elog.h:26
pgsocket sock
Definition: libpq-be.h:118
#define IS_AF_UNIX(fam)
Definition: ip.h:24
SockAddr laddr
Definition: libpq-be.h:121
int default_keepalives_idle
Definition: libpq-be.h:160
#define elog
Definition: elog.h:219

◆ pq_getkeepalivesinterval()

int pq_getkeepalivesinterval ( Port port)

Definition at line 1778 of file pqcomm.c.

References SockAddr::addr, Port::default_keepalives_interval, elog, IS_AF_UNIX, Port::keepalives_interval, Port::laddr, LOG, and Port::sock.

Referenced by pq_setkeepalivesinterval(), and show_tcp_keepalives_interval().

1779 {
1780 #if defined(TCP_KEEPINTVL) || defined(SIO_KEEPALIVE_VALS)
1781  if (port == NULL || IS_AF_UNIX(port->laddr.addr.ss_family))
1782  return 0;
1783 
1784  if (port->keepalives_interval != 0)
1785  return port->keepalives_interval;
1786 
1787  if (port->default_keepalives_interval == 0)
1788  {
1789 #ifndef WIN32
1790  ACCEPT_TYPE_ARG3 size = sizeof(port->default_keepalives_interval);
1791 
1792  if (getsockopt(port->sock, IPPROTO_TCP, TCP_KEEPINTVL,
1793  (char *) &port->default_keepalives_interval,
1794  &size) < 0)
1795  {
1796  elog(LOG, "getsockopt(%s) failed: %m", "TCP_KEEPINTVL");
1797  port->default_keepalives_interval = -1; /* don't know */
1798  }
1799 #else
1800  /* We can't get the defaults on Windows, so return "don't know" */
1801  port->default_keepalives_interval = -1;
1802 #endif /* WIN32 */
1803  }
1804 
1805  return port->default_keepalives_interval;
1806 #else
1807  return 0;
1808 #endif
1809 }
struct sockaddr_storage addr
Definition: pqcomm.h:64
#define LOG
Definition: elog.h:26
int default_keepalives_interval
Definition: libpq-be.h:161
pgsocket sock
Definition: libpq-be.h:118
#define IS_AF_UNIX(fam)
Definition: ip.h:24
SockAddr laddr
Definition: libpq-be.h:121
#define elog
Definition: elog.h:219
int keepalives_interval
Definition: libpq-be.h:164

◆ pq_getmessage()

int pq_getmessage ( StringInfo  s,
int  maxlen 
)

Definition at line 1272 of file pqcomm.c.

References Assert, COMMERROR, StringInfoData::data, enlargeStringInfo(), ereport, errcode(), errmsg(), StringInfoData::len, PG_CATCH, PG_END_TRY, pg_ntoh32, PG_RE_THROW, PG_TRY, pq_discardbytes(), pq_getbytes(), PqCommReadingMsg, and resetStringInfo().

Referenced by CheckSCRAMAuth(), CopyGetData(), ProcessRepliesIfAny(), recv_password_packet(), and SocketBackend().

1273 {
1274  int32 len;
1275 
1277 
1278  resetStringInfo(s);
1279 
1280  /* Read message length word */
1281  if (pq_getbytes((char *) &len, 4) == EOF)
1282  {
1284  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1285  errmsg("unexpected EOF within message length word")));
1286  return EOF;
1287  }
1288 
1289  len = pg_ntoh32(len);
1290 
1291  if (len < 4 ||
1292  (maxlen > 0 && len > maxlen))
1293  {
1295  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1296  errmsg("invalid message length")));
1297  return EOF;
1298  }
1299 
1300  len -= 4; /* discount length itself */
1301 
1302  if (len > 0)
1303  {
1304  /*
1305  * Allocate space for message. If we run out of room (ridiculously
1306  * large message), we will elog(ERROR), but we want to discard the
1307  * message body so as not to lose communication sync.
1308  */
1309  PG_TRY();
1310  {
1311  enlargeStringInfo(s, len);
1312  }
1313  PG_CATCH();
1314  {
1315  if (pq_discardbytes(len) == EOF)
1317  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1318  errmsg("incomplete message from client")));
1319 
1320  /* we discarded the rest of the message so we're back in sync. */
1321  PqCommReadingMsg = false;
1322  PG_RE_THROW();
1323  }
1324  PG_END_TRY();
1325 
1326  /* And grab the message */
1327  if (pq_getbytes(s->data, len) == EOF)
1328  {
1330  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1331  errmsg("incomplete message from client")));
1332  return EOF;
1333  }
1334  s->len = len;
1335  /* Place a trailing null per StringInfo convention */
1336  s->data[len] = '\0';
1337  }
1338 
1339  /* finished reading the message. */
1340  PqCommReadingMsg = false;
1341 
1342  return 0;
1343 }
static int pq_discardbytes(size_t len)
Definition: pqcomm.c:1128
int errcode(int sqlerrcode)
Definition: elog.c:575
signed int int32
Definition: c.h:284
#define pg_ntoh32(x)
Definition: pg_bswap.h:125
int pq_getbytes(char *s, size_t len)
Definition: pqcomm.c:1094
#define COMMERROR
Definition: elog.h:30
void enlargeStringInfo(StringInfo str, int needed)
Definition: stringinfo.c:264
void resetStringInfo(StringInfo str)
Definition: stringinfo.c:62
#define ereport(elevel, rest)
Definition: elog.h:122
#define PG_CATCH()
Definition: elog.h:293
#define Assert(condition)
Definition: c.h:670
#define PG_RE_THROW()
Definition: elog.h:314
int errmsg(const char *fmt,...)
Definition: elog.c:797
static bool PqCommReadingMsg
Definition: pqcomm.c:150
#define PG_TRY()
Definition: elog.h:284
#define PG_END_TRY()
Definition: elog.h:300

◆ pq_getstring()

int pq_getstring ( StringInfo  s)

Definition at line 1166 of file pqcomm.c.

References appendBinaryStringInfo(), Assert, i, pq_recvbuf(), PqCommReadingMsg, PqRecvBuffer, PqRecvLength, PqRecvPointer, and resetStringInfo().

Referenced by GetOldFunctionMessage(), and SocketBackend().

1167 {
1168  int i;
1169 
1171 
1172  resetStringInfo(s);
1173 
1174  /* Read until we get the terminating '\0' */
1175  for (;;)
1176  {
1177  while (PqRecvPointer >= PqRecvLength)
1178  {
1179  if (pq_recvbuf()) /* If nothing in buffer, then recv some */
1180  return EOF; /* Failed to recv data */
1181  }
1182 
1183  for (i = PqRecvPointer; i < PqRecvLength; i++)
1184  {
1185  if (PqRecvBuffer[i] == '\0')
1186  {
1187  /* include the '\0' in the copy */
1189  i - PqRecvPointer + 1);
1190  PqRecvPointer = i + 1; /* advance past \0 */
1191  return 0;
1192  }
1193  }
1194 
1195  /* If we're here we haven't got the \0 in the buffer yet. */
1197  PqRecvLength - PqRecvPointer);
1199  }
1200 }
static char PqRecvBuffer[PQ_RECV_BUFFER_SIZE]
Definition: pqcomm.c:142
static int PqRecvLength
Definition: pqcomm.c:144
static int pq_recvbuf(void)
Definition: pqcomm.c:939
void resetStringInfo(StringInfo str)
Definition: stringinfo.c:62
#define Assert(condition)
Definition: c.h:670
int i
static int PqRecvPointer
Definition: pqcomm.c:143
static bool PqCommReadingMsg
Definition: pqcomm.c:150
void appendBinaryStringInfo(StringInfo str, const char *data, int datalen)
Definition: stringinfo.c:208

◆ pq_init()

void pq_init ( void  )

Definition at line 194 of file pqcomm.c.

References AddWaitEventToSet(), COMMERROR, CreateWaitEventSet(), DoingCopyOut, ereport, errmsg(), MemoryContextAlloc(), MyLatch, MyProcPort, on_proc_exit(), pg_set_noblock(), PQ_SEND_BUFFER_SIZE, PqCommBusy, PqCommReadingMsg, PqRecvLength, PqRecvPointer, PqSendBuffer, PqSendBufferSize, PqSendPointer, PqSendStart, Port::sock, socket_close(), TopMemoryContext, WL_LATCH_SET, WL_POSTMASTER_DEATH, and WL_SOCKET_WRITEABLE.

Referenced by BackendInitialize().

195 {
196  /* initialize state variables */
200  PqCommBusy = false;
201  PqCommReadingMsg = false;
202  DoingCopyOut = false;
203 
204  /* set up process-exit hook to close the socket */
206 
207  /*
208  * In backends (as soon as forked) we operate the underlying socket in
209  * nonblocking mode and use latches to implement blocking semantics if
210  * needed. That allows us to provide safely interruptible reads and
211  * writes.
212  *
213  * Use COMMERROR on failure, because ERROR would try to send the error to
214  * the client, which might require changing the mode again, leading to
215  * infinite recursion.
216  */
217 #ifndef WIN32
220  (errmsg("could not set socket to nonblocking mode: %m")));
221 #endif
222 
225  NULL, NULL);
228 }
#define WL_SOCKET_WRITEABLE
Definition: latch.h:126
static bool DoingCopyOut
Definition: pqcomm.c:151
struct Port * MyProcPort
Definition: globals.c:41
int AddWaitEventToSet(WaitEventSet *set, uint32 events, pgsocket fd, Latch *latch, void *user_data)
Definition: latch.c:666
void on_proc_exit(pg_on_exit_callback function, Datum arg)
Definition: ipc.c:292
static char * PqSendBuffer
Definition: pqcomm.c:137
static int PqSendStart
Definition: pqcomm.c:140
WaitEventSet * FeBeWaitSet
Definition: pqcomm.c:186
pgsocket sock
Definition: libpq-be.h:118
WaitEventSet * CreateWaitEventSet(MemoryContext context, int nevents)
Definition: latch.c:520
static int PqRecvLength
Definition: pqcomm.c:144
static int PqSendPointer
Definition: pqcomm.c:139
#define COMMERROR
Definition: elog.h:30
#define ereport(elevel, rest)
Definition: elog.h:122
MemoryContext TopMemoryContext
Definition: mcxt.c:43
static int PqSendBufferSize
Definition: pqcomm.c:138
static bool PqCommBusy
Definition: pqcomm.c:149
#define WL_POSTMASTER_DEATH
Definition: latch.h:128
bool pg_set_noblock(pgsocket sock)
Definition: noblock.c:25
static void socket_close(int code, Datum arg)
Definition: pqcomm.c:256
int errmsg(const char *fmt,...)
Definition: elog.c:797
void * MemoryContextAlloc(MemoryContext context, Size size)
Definition: mcxt.c:706
struct Latch * MyLatch
Definition: globals.c:52
static int PqRecvPointer
Definition: pqcomm.c:143
static bool PqCommReadingMsg
Definition: pqcomm.c:150
#define WL_LATCH_SET
Definition: latch.h:124
#define PQ_SEND_BUFFER_SIZE
Definition: pqcomm.c:134

◆ pq_is_reading_msg()

bool pq_is_reading_msg ( void  )

Definition at line 1250 of file pqcomm.c.

References PqCommReadingMsg.

Referenced by PostgresMain().

1251 {
1252  return PqCommReadingMsg;
1253 }
static bool PqCommReadingMsg
Definition: pqcomm.c:150

◆ pq_peekbyte()

int pq_peekbyte ( void  )

Definition at line 1019 of file pqcomm.c.

References Assert, pq_recvbuf(), PqCommReadingMsg, PqRecvBuffer, PqRecvLength, and PqRecvPointer.

Referenced by recv_password_packet().

1020 {
1022 
1023  while (PqRecvPointer >= PqRecvLength)
1024  {
1025  if (pq_recvbuf()) /* If nothing in buffer, then recv some */
1026  return EOF; /* Failed to recv data */
1027  }
1028  return (unsigned char) PqRecvBuffer[PqRecvPointer];
1029 }
static char PqRecvBuffer[PQ_RECV_BUFFER_SIZE]
Definition: pqcomm.c:142
static int PqRecvLength
Definition: pqcomm.c:144
static int pq_recvbuf(void)
Definition: pqcomm.c:939
#define Assert(condition)
Definition: c.h:670
static int PqRecvPointer
Definition: pqcomm.c:143
static bool PqCommReadingMsg
Definition: pqcomm.c:150

◆ pq_putbytes()

int pq_putbytes ( const char *  s,
size_t  len 
)

Definition at line 1353 of file pqcomm.c.

References Assert, DoingCopyOut, internal_putbytes(), and PqCommBusy.

Referenced by CopySendEndOfRow(), and socket_endcopyout().

1354 {
1355  int res;
1356 
1357  /* Should only be called by old-style COPY OUT */
1359  /* No-op if reentrant call */
1360  if (PqCommBusy)
1361  return 0;
1362  PqCommBusy = true;
1363  res = internal_putbytes(s, len);
1364  PqCommBusy = false;
1365  return res;
1366 }
static bool DoingCopyOut
Definition: pqcomm.c:151
static int internal_putbytes(const char *s, size_t len)
Definition: pqcomm.c:1369
static bool PqCommBusy
Definition: pqcomm.c:149
#define Assert(condition)
Definition: c.h:670

◆ pq_recvbuf()

static int pq_recvbuf ( void  )
static

Definition at line 939 of file pqcomm.c.

References COMMERROR, EINTR, ereport, errcode_for_socket_access(), errmsg(), memmove, MyProcPort, PQ_RECV_BUFFER_SIZE, PqRecvBuffer, PqRecvLength, PqRecvPointer, secure_read(), and socket_set_nonblocking().

Referenced by pq_discardbytes(), pq_getbyte(), pq_getbytes(), pq_getstring(), and pq_peekbyte().

940 {
941  if (PqRecvPointer > 0)
942  {
944  {
945  /* still some unread data, left-justify it in the buffer */
949  PqRecvPointer = 0;
950  }
951  else
953  }
954 
955  /* Ensure that we're in blocking mode */
956  socket_set_nonblocking(false);
957 
958  /* Can fill buffer from PqRecvLength and upwards */
959  for (;;)
960  {
961  int r;
962 
965 
966  if (r < 0)
967  {
968  if (errno == EINTR)
969  continue; /* Ok if interrupted */
970 
971  /*
972  * Careful: an ereport() that tries to write to the client would
973  * cause recursion to here, leading to stack overflow and core
974  * dump! This message must go *only* to the postmaster log.
975  */
978  errmsg("could not receive data from client: %m")));
979  return EOF;
980  }
981  if (r == 0)
982  {
983  /*
984  * EOF detected. We used to write a log message here, but it's
985  * better to expect the ultimate caller to do that.
986  */
987  return EOF;
988  }
989  /* r contains number of bytes read, so just incr length */
990  PqRecvLength += r;
991  return 0;
992  }
993 }
static char PqRecvBuffer[PQ_RECV_BUFFER_SIZE]
Definition: pqcomm.c:142
struct Port * MyProcPort
Definition: globals.c:41
ssize_t secure_read(Port *port, void *ptr, size_t len)
Definition: be-secure.c:138
static void socket_set_nonblocking(bool nonblocking)
Definition: pqcomm.c:922
static int PqRecvLength
Definition: pqcomm.c:144
#define memmove(d, s, c)
Definition: c.h:1045
#define COMMERROR
Definition: elog.h:30
#define ereport(elevel, rest)
Definition: elog.h:122
int errcode_for_socket_access(void)
Definition: elog.c:669
int errmsg(const char *fmt,...)
Definition: elog.c:797
#define PQ_RECV_BUFFER_SIZE
Definition: pqcomm.c:135
static int PqRecvPointer
Definition: pqcomm.c:143
#define EINTR
Definition: win32_port.h:334

◆ pq_setkeepalivescount()

int pq_setkeepalivescount ( int  count,
Port port 
)

Definition at line 1888 of file pqcomm.c.

References SockAddr::addr, Port::default_keepalives_count, elog, IS_AF_UNIX, Port::keepalives_count, Port::laddr, LOG, pq_getkeepalivescount(), Port::sock, STATUS_ERROR, and STATUS_OK.

Referenced by assign_tcp_keepalives_count(), and StreamConnection().

1889 {
1890  if (port == NULL || IS_AF_UNIX(port->laddr.addr.ss_family))
1891  return STATUS_OK;
1892 
1893 #ifdef TCP_KEEPCNT
1894  if (count == port->keepalives_count)
1895  return STATUS_OK;
1896 
1897  if (port->default_keepalives_count <= 0)
1898  {
1899  if (pq_getkeepalivescount(port) < 0)
1900  {
1901  if (count == 0)
1902  return STATUS_OK; /* default is set but unknown */
1903  else
1904  return STATUS_ERROR;
1905  }
1906  }
1907 
1908  if (count == 0)
1909  count = port->default_keepalives_count;
1910 
1911  if (setsockopt(port->sock, IPPROTO_TCP, TCP_KEEPCNT,
1912  (char *) &count, sizeof(count)) < 0)
1913  {
1914  elog(LOG, "setsockopt(%s) failed: %m", "TCP_KEEPCNT");
1915  return STATUS_ERROR;
1916  }
1917 
1918  port->keepalives_count = count;
1919 #else
1920  if (count != 0)
1921  {
1922  elog(LOG, "setsockopt(%s) not supported", "TCP_KEEPCNT");
1923  return STATUS_ERROR;
1924  }
1925 #endif
1926 
1927  return STATUS_OK;
1928 }
struct sockaddr_storage addr
Definition: pqcomm.h:64
#define STATUS_ERROR
Definition: c.h:954
#define LOG
Definition: elog.h:26
int default_keepalives_count
Definition: libpq-be.h:162
pgsocket sock
Definition: libpq-be.h:118
int keepalives_count
Definition: libpq-be.h:165
#define IS_AF_UNIX(fam)
Definition: ip.h:24
#define STATUS_OK
Definition: c.h:953
SockAddr laddr
Definition: libpq-be.h:121
int pq_getkeepalivescount(Port *port)
Definition: pqcomm.c:1859
#define elog
Definition: elog.h:219

◆ pq_setkeepalivesidle()

int pq_setkeepalivesidle ( int  idle,
Port port 
)

Definition at line 1730 of file pqcomm.c.

References SockAddr::addr, Port::default_keepalives_idle, elog, IS_AF_UNIX, Port::keepalives_idle, Port::keepalives_interval, Port::laddr, LOG, pq_getkeepalivesidle(), Port::sock, STATUS_ERROR, and STATUS_OK.

Referenced by assign_tcp_keepalives_idle(), and StreamConnection().

1731 {
1732  if (port == NULL || IS_AF_UNIX(port->laddr.addr.ss_family))
1733  return STATUS_OK;
1734 
1735 /* check SIO_KEEPALIVE_VALS here, not just WIN32, as some toolchains lack it */
1736 #if defined(PG_TCP_KEEPALIVE_IDLE) || defined(SIO_KEEPALIVE_VALS)
1737  if (idle == port->keepalives_idle)
1738  return STATUS_OK;
1739 
1740 #ifndef WIN32
1741  if (port->default_keepalives_idle <= 0)
1742  {
1743  if (pq_getkeepalivesidle(port) < 0)
1744  {
1745  if (idle == 0)
1746  return STATUS_OK; /* default is set but unknown */
1747  else
1748  return STATUS_ERROR;
1749  }
1750  }
1751 
1752  if (idle == 0)
1753  idle = port->default_keepalives_idle;
1754 
1755  if (setsockopt(port->sock, IPPROTO_TCP, PG_TCP_KEEPALIVE_IDLE,
1756  (char *) &idle, sizeof(idle)) < 0)
1757  {
1758  elog(LOG, "setsockopt(%s) failed: %m", PG_TCP_KEEPALIVE_IDLE_STR);
1759  return STATUS_ERROR;
1760  }
1761 
1762  port->keepalives_idle = idle;
1763 #else /* WIN32 */
1764  return pq_setkeepaliveswin32(port, idle, port->keepalives_interval);
1765 #endif
1766 #else
1767  if (idle != 0)
1768  {
1769  elog(LOG, "setting the keepalive idle time is not supported");
1770  return STATUS_ERROR;
1771  }
1772 #endif
1773 
1774  return STATUS_OK;
1775 }
int keepalives_idle
Definition: libpq-be.h:163
struct sockaddr_storage addr
Definition: pqcomm.h:64
#define STATUS_ERROR
Definition: c.h:954
#define LOG
Definition: elog.h:26
pgsocket sock
Definition: libpq-be.h:118
#define IS_AF_UNIX(fam)
Definition: ip.h:24
#define STATUS_OK
Definition: c.h:953
SockAddr laddr
Definition: libpq-be.h:121
int default_keepalives_idle
Definition: libpq-be.h:160
int pq_getkeepalivesidle(Port *port)
Definition: pqcomm.c:1696
#define elog
Definition: elog.h:219
int keepalives_interval
Definition: libpq-be.h:164

◆ pq_setkeepalivesinterval()

int pq_setkeepalivesinterval ( int  interval,
Port port 
)

Definition at line 1812 of file pqcomm.c.

References SockAddr::addr, Port::default_keepalives_interval, elog, IS_AF_UNIX, Port::keepalives_idle, Port::keepalives_interval, Port::laddr, LOG, pq_getkeepalivesinterval(), Port::sock, STATUS_ERROR, and STATUS_OK.

Referenced by assign_tcp_keepalives_interval(), and StreamConnection().

1813 {
1814  if (port == NULL || IS_AF_UNIX(port->laddr.addr.ss_family))
1815  return STATUS_OK;
1816 
1817 #if defined(TCP_KEEPINTVL) || defined(SIO_KEEPALIVE_VALS)
1818  if (interval == port->keepalives_interval)
1819  return STATUS_OK;
1820 
1821 #ifndef WIN32
1822  if (port->default_keepalives_interval <= 0)
1823  {
1824  if (pq_getkeepalivesinterval(port) < 0)
1825  {
1826  if (interval == 0)
1827  return STATUS_OK; /* default is set but unknown */
1828  else
1829  return STATUS_ERROR;
1830  }
1831  }
1832 
1833  if (interval == 0)
1835 
1836  if (setsockopt(port->sock, IPPROTO_TCP, TCP_KEEPINTVL,
1837  (char *) &interval, sizeof(interval)) < 0)
1838  {
1839  elog(LOG, "setsockopt(%s) failed: %m", "TCP_KEEPINTVL");
1840  return STATUS_ERROR;
1841  }
1842 
1843  port->keepalives_interval = interval;
1844 #else /* WIN32 */
1845  return pq_setkeepaliveswin32(port, port->keepalives_idle, interval);
1846 #endif
1847 #else
1848  if (interval != 0)
1849  {
1850  elog(LOG, "setsockopt(%s) not supported", "TCP_KEEPINTVL");
1851  return STATUS_ERROR;
1852  }
1853 #endif
1854 
1855  return STATUS_OK;
1856 }
int keepalives_idle
Definition: libpq-be.h:163
int pq_getkeepalivesinterval(Port *port)
Definition: pqcomm.c:1778
struct sockaddr_storage addr
Definition: pqcomm.h:64
#define STATUS_ERROR
Definition: c.h:954
#define LOG
Definition: elog.h:26
int default_keepalives_interval
Definition: libpq-be.h:161
pgsocket sock
Definition: libpq-be.h:118
#define IS_AF_UNIX(fam)
Definition: ip.h:24
#define STATUS_OK
Definition: c.h:953
SockAddr laddr
Definition: libpq-be.h:121
#define elog
Definition: elog.h:219
int keepalives_interval
Definition: libpq-be.h:164

◆ pq_startmsgread()

void pq_startmsgread ( void  )

Definition at line 1210 of file pqcomm.c.

References ereport, errcode(), errmsg(), FATAL, and PqCommReadingMsg.

Referenced by CheckSCRAMAuth(), CopyGetData(), ProcessRepliesIfAny(), ProcessStartupPacket(), ReceiveCopyBegin(), recv_password_packet(), and SocketBackend().

1211 {
1212  /*
1213  * There shouldn't be a read active already, but let's check just to be
1214  * sure.
1215  */
1216  if (PqCommReadingMsg)
1217  ereport(FATAL,
1218  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1219  errmsg("terminating connection because protocol synchronization was lost")));
1220 
1221  PqCommReadingMsg = true;
1222 }
int errcode(int sqlerrcode)
Definition: elog.c:575
#define FATAL
Definition: elog.h:52
#define ereport(elevel, rest)
Definition: elog.h:122
int errmsg(const char *fmt,...)
Definition: elog.c:797
static bool PqCommReadingMsg
Definition: pqcomm.c:150

◆ RemoveSocketFiles()

void RemoveSocketFiles ( void  )

Definition at line 889 of file pqcomm.c.

References lfirst, and NIL.

Referenced by CloseServerPorts().

890 {
891  ListCell *l;
892 
893  /* Loop through all created sockets... */
894  foreach(l, sock_paths)
895  {
896  char *sock_path = (char *) lfirst(l);
897 
898  /* Ignore any error. */
899  (void) unlink(sock_path);
900  }
901  /* Since we're about to exit, no need to reclaim storage */
902  sock_paths = NIL;
903 }
#define NIL
Definition: pg_list.h:69
static List * sock_paths
Definition: pqcomm.c:125
#define lfirst(lc)
Definition: pg_list.h:106

◆ socket_close()

static void socket_close ( int  code,
Datum  arg 
)
static

Definition at line 256 of file pqcomm.c.

References free, Port::gss, MyProcPort, PGINVALID_SOCKET, secure_close(), and Port::sock.

Referenced by pq_init().

257 {
258  /* Nothing to do in a standalone backend, where MyProcPort is NULL. */
259  if (MyProcPort != NULL)
260  {
261 #if defined(ENABLE_GSS) || defined(ENABLE_SSPI)
262 #ifdef ENABLE_GSS
263  OM_uint32 min_s;
264 
265  /*
266  * Shutdown GSSAPI layer. This section does nothing when interrupting
267  * BackendInitialize(), because pg_GSS_recvauth() makes first use of
268  * "ctx" and "cred".
269  */
270  if (MyProcPort->gss->ctx != GSS_C_NO_CONTEXT)
271  gss_delete_sec_context(&min_s, &MyProcPort->gss->ctx, NULL);
272 
273  if (MyProcPort->gss->cred != GSS_C_NO_CREDENTIAL)
274  gss_release_cred(&min_s, &MyProcPort->gss->cred);
275 #endif /* ENABLE_GSS */
276 
277  /*
278  * GSS and SSPI share the port->gss struct. Since nowhere else does a
279  * postmaster child free this, doing so is safe when interrupting
280  * BackendInitialize().
281  */
282  free(MyProcPort->gss);
283 #endif /* ENABLE_GSS || ENABLE_SSPI */
284 
285  /*
286  * Cleanly shut down SSL layer. Nowhere else does a postmaster child
287  * call this, so this is safe when interrupting BackendInitialize().
288  */
290 
291  /*
292  * Formerly we did an explicit close() here, but it seems better to
293  * leave the socket open until the process dies. This allows clients
294  * to perform a "synchronous close" if they care --- wait till the
295  * transport layer reports connection closure, and you can be sure the
296  * backend has exited.
297  *
298  * We do set sock to PGINVALID_SOCKET to prevent any further I/O,
299  * though.
300  */
302  }
303 }
struct Port * MyProcPort
Definition: globals.c:41
pgsocket sock
Definition: libpq-be.h:118
#define PGINVALID_SOCKET
Definition: port.h:33
#define free(a)
Definition: header.h:65
void secure_close(Port *port)
Definition: be-secure.c:126
void * gss
Definition: libpq-be.h:175

◆ socket_comm_reset()

static void socket_comm_reset ( void  )
static

Definition at line 239 of file pqcomm.c.

References pq_endcopyout, and PqCommBusy.

240 {
241  /* Do not throw away pending data, but do reset the busy flag */
242  PqCommBusy = false;
243  /* We can abort any old-style COPY OUT, too */
244  pq_endcopyout(true);
245 }
static bool PqCommBusy
Definition: pqcomm.c:149
#define pq_endcopyout(errorAbort)
Definition: libpq.h:47

◆ socket_endcopyout()

static void socket_endcopyout ( bool  errorAbort)
static

Definition at line 1636 of file pqcomm.c.

References DoingCopyOut, elog, Port::keepalives_idle, Port::keepalives_interval, LOG, port, pq_putbytes(), Port::sock, STATUS_ERROR, and STATUS_OK.

1637 {
1638  if (!DoingCopyOut)
1639  return;
1640  if (errorAbort)
1641  pq_putbytes("\n\n\\.\n", 5);
1642  /* in non-error case, copy.c will have emitted the terminator line */
1643  DoingCopyOut = false;
1644 }
static bool DoingCopyOut
Definition: pqcomm.c:151
int pq_putbytes(const char *s, size_t len)
Definition: pqcomm.c:1353

◆ socket_flush()

static int socket_flush ( void  )
static

Definition at line 1400 of file pqcomm.c.

References internal_flush(), PqCommBusy, and socket_set_nonblocking().

1401 {
1402  int res;
1403 
1404  /* No-op if reentrant call */
1405  if (PqCommBusy)
1406  return 0;
1407  PqCommBusy = true;
1408  socket_set_nonblocking(false);
1409  res = internal_flush();
1410  PqCommBusy = false;
1411  return res;
1412 }
static int internal_flush(void)
Definition: pqcomm.c:1422
static void socket_set_nonblocking(bool nonblocking)
Definition: pqcomm.c:922
static bool PqCommBusy
Definition: pqcomm.c:149

◆ socket_flush_if_writable()

static int socket_flush_if_writable ( void  )
static

Definition at line 1495 of file pqcomm.c.

References internal_flush(), PqCommBusy, PqSendPointer, PqSendStart, and socket_set_nonblocking().

1496 {
1497  int res;
1498 
1499  /* Quick exit if nothing to do */
1500  if (PqSendPointer == PqSendStart)
1501  return 0;
1502 
1503  /* No-op if reentrant call */
1504  if (PqCommBusy)
1505  return 0;
1506 
1507  /* Temporarily put the socket into non-blocking mode */
1508  socket_set_nonblocking(true);
1509 
1510  PqCommBusy = true;
1511  res = internal_flush();
1512  PqCommBusy = false;
1513  return res;
1514 }
static int PqSendStart
Definition: pqcomm.c:140
static int internal_flush(void)
Definition: pqcomm.c:1422
static void socket_set_nonblocking(bool nonblocking)
Definition: pqcomm.c:922
static int PqSendPointer
Definition: pqcomm.c:139
static bool PqCommBusy
Definition: pqcomm.c:149

◆ socket_is_send_pending()

static bool socket_is_send_pending ( void  )
static

Definition at line 1521 of file pqcomm.c.

References PqSendPointer, and PqSendStart.

1522 {
1523  return (PqSendStart < PqSendPointer);
1524 }
static int PqSendStart
Definition: pqcomm.c:140
static int PqSendPointer
Definition: pqcomm.c:139

◆ socket_putmessage()

static int socket_putmessage ( char  msgtype,
const char *  s,
size_t  len 
)
static

Definition at line 1560 of file pqcomm.c.

References DoingCopyOut, FrontendProtocol, internal_putbytes(), pg_hton32, PG_PROTOCOL_MAJOR, and PqCommBusy.

1561 {
1562  if (DoingCopyOut || PqCommBusy)
1563  return 0;
1564  PqCommBusy = true;
1565  if (msgtype)
1566  if (internal_putbytes(&msgtype, 1))
1567  goto fail;
1569  {
1570  uint32 n32;
1571 
1572  n32 = pg_hton32((uint32) (len + 4));
1573  if (internal_putbytes((char *) &n32, 4))
1574  goto fail;
1575  }
1576  if (internal_putbytes(s, len))
1577  goto fail;
1578  PqCommBusy = false;
1579  return 0;
1580 
1581 fail:
1582  PqCommBusy = false;
1583  return EOF;
1584 }
static bool DoingCopyOut
Definition: pqcomm.c:151
#define PG_PROTOCOL_MAJOR(v)
Definition: pqcomm.h:104
#define pg_hton32(x)
Definition: pg_bswap.h:121
unsigned int uint32
Definition: c.h:296
static int internal_putbytes(const char *s, size_t len)
Definition: pqcomm.c:1369
static bool PqCommBusy
Definition: pqcomm.c:149
ProtocolVersion FrontendProtocol
Definition: globals.c:27

◆ socket_putmessage_noblock()

static void socket_putmessage_noblock ( char  msgtype,
const char *  s,
size_t  len 
)
static

Definition at line 1593 of file pqcomm.c.

References Assert, PG_USED_FOR_ASSERTS_ONLY, pq_putmessage, PqSendBuffer, PqSendBufferSize, PqSendPointer, repalloc(), and generate_unaccent_rules::required.

1594 {
1595  int res PG_USED_FOR_ASSERTS_ONLY;
1596  int required;
1597 
1598  /*
1599  * Ensure we have enough space in the output buffer for the message header
1600  * as well as the message itself.
1601  */
1602  required = PqSendPointer + 1 + 4 + len;
1603  if (required > PqSendBufferSize)
1604  {
1605  PqSendBuffer = repalloc(PqSendBuffer, required);
1607  }
1608  res = pq_putmessage(msgtype, s, len);
1609  Assert(res == 0); /* should not fail when the message fits in
1610  * buffer */
1611 }
static char * PqSendBuffer
Definition: pqcomm.c:137
static int PqSendPointer
Definition: pqcomm.c:139
static int PqSendBufferSize
Definition: pqcomm.c:138
#define Assert(condition)
Definition: c.h:670
void * repalloc(void *pointer, Size size)
Definition: mcxt.c:962
#define pq_putmessage(msgtype, s, len)
Definition: libpq.h:42
#define PG_USED_FOR_ASSERTS_ONLY
Definition: c.h:122

◆ socket_set_nonblocking()

static void socket_set_nonblocking ( bool  nonblocking)
static

Definition at line 922 of file pqcomm.c.

References ereport, errcode(), errmsg(), ERROR, MyProcPort, and Port::noblock.

Referenced by internal_putbytes(), pq_getbyte_if_available(), pq_recvbuf(), socket_flush(), and socket_flush_if_writable().

923 {
924  if (MyProcPort == NULL)
925  ereport(ERROR,
926  (errcode(ERRCODE_CONNECTION_DOES_NOT_EXIST),
927  errmsg("there is no client connection")));
928 
929  MyProcPort->noblock = nonblocking;
930 }
struct Port * MyProcPort
Definition: globals.c:41
int errcode(int sqlerrcode)
Definition: elog.c:575
#define ERROR
Definition: elog.h:43
#define ereport(elevel, rest)
Definition: elog.h:122
bool noblock
Definition: libpq-be.h:119
int errmsg(const char *fmt,...)
Definition: elog.c:797

◆ socket_startcopyout()

static void socket_startcopyout ( void  )
static

Definition at line 1620 of file pqcomm.c.

References DoingCopyOut.

1621 {
1622  DoingCopyOut = true;
1623 }
static bool DoingCopyOut
Definition: pqcomm.c:151

◆ StreamClose()

void StreamClose ( pgsocket  sock)

Definition at line 844 of file pqcomm.c.

References closesocket.

Referenced by ClosePostmasterPorts(), CloseServerPorts(), ConnCreate(), and ServerLoop().

845 {
846  closesocket(sock);
847 }
#define closesocket
Definition: port.h:292

◆ StreamConnection()

int StreamConnection ( pgsocket  server_fd,
Port port 
)

Definition at line 716 of file pqcomm.c.

References accept, SockAddr::addr, elog, ereport, errcode_for_socket_access(), errmsg(), IS_AF_UNIX, Port::laddr, LOG, pg_usleep(), PGINVALID_SOCKET, PQ_SEND_BUFFER_SIZE, pq_setkeepalivescount(), pq_setkeepalivesidle(), pq_setkeepalivesinterval(), Port::raddr, SockAddr::salen, Port::sock, STATUS_ERROR, STATUS_OK, tcp_keepalives_count, tcp_keepalives_idle, and tcp_keepalives_interval.

Referenced by ConnCreate().

717 {
718  /* accept connection and fill in the client (remote) address */
719  port->raddr.salen = sizeof(port->raddr.addr);
720  if ((port->sock = accept(server_fd,
721  (struct sockaddr *) &port->raddr.addr,
722  &port->raddr.salen)) == PGINVALID_SOCKET)
723  {
724  ereport(LOG,
726  errmsg("could not accept new connection: %m")));
727 
728  /*
729  * If accept() fails then postmaster.c will still see the server
730  * socket as read-ready, and will immediately try again. To avoid
731  * uselessly sucking lots of CPU, delay a bit before trying again.
732  * (The most likely reason for failure is being out of kernel file
733  * table slots; we can do little except hope some will get freed up.)
734  */
735  pg_usleep(100000L); /* wait 0.1 sec */
736  return STATUS_ERROR;
737  }
738 
739  /* fill in the server (local) address */
740  port->laddr.salen = sizeof(port->laddr.addr);
741  if (getsockname(port->sock,
742  (struct sockaddr *) &port->laddr.addr,
743  &port->laddr.salen) < 0)
744  {
745  elog(LOG, "getsockname() failed: %m");
746  return STATUS_ERROR;
747  }
748 
749  /* select NODELAY and KEEPALIVE options if it's a TCP connection */
750  if (!IS_AF_UNIX(port->laddr.addr.ss_family))
751  {
752  int on;
753 #ifdef WIN32
754  int oldopt;
755  int optlen;
756  int newopt;
757 #endif
758 
759 #ifdef TCP_NODELAY
760  on = 1;
761  if (setsockopt(port->sock, IPPROTO_TCP, TCP_NODELAY,
762  (char *) &on, sizeof(on)) < 0)
763  {
764  elog(LOG, "setsockopt(%s) failed: %m", "TCP_NODELAY");
765  return STATUS_ERROR;
766  }
767 #endif
768  on = 1;
769  if (setsockopt(port->sock, SOL_SOCKET, SO_KEEPALIVE,
770  (char *) &on, sizeof(on)) < 0)
771  {
772  elog(LOG, "setsockopt(%s) failed: %m", "SO_KEEPALIVE");
773  return STATUS_ERROR;
774  }
775 
776 #ifdef WIN32
777 
778  /*
779  * This is a Win32 socket optimization. The OS send buffer should be
780  * large enough to send the whole Postgres send buffer in one go, or
781  * performance suffers. The Postgres send buffer can be enlarged if a
782  * very large message needs to be sent, but we won't attempt to
783  * enlarge the OS buffer if that happens, so somewhat arbitrarily
784  * ensure that the OS buffer is at least PQ_SEND_BUFFER_SIZE * 4.
785  * (That's 32kB with the current default).
786  *
787  * The default OS buffer size used to be 8kB in earlier Windows
788  * versions, but was raised to 64kB in Windows 2012. So it shouldn't
789  * be necessary to change it in later versions anymore. Changing it
790  * unnecessarily can even reduce performance, because setting
791  * SO_SNDBUF in the application disables the "dynamic send buffering"
792  * feature that was introduced in Windows 7. So before fiddling with
793  * SO_SNDBUF, check if the current buffer size is already large enough
794  * and only increase it if necessary.
795  *
796  * See https://support.microsoft.com/kb/823764/EN-US/ and
797  * https://msdn.microsoft.com/en-us/library/bb736549%28v=vs.85%29.aspx
798  */
799  optlen = sizeof(oldopt);
800  if (getsockopt(port->sock, SOL_SOCKET, SO_SNDBUF, (char *) &oldopt,
801  &optlen) < 0)
802  {
803  elog(LOG, "getsockopt(%s) failed: %m", "SO_SNDBUF");
804  return STATUS_ERROR;
805  }
806  newopt = PQ_SEND_BUFFER_SIZE * 4;
807  if (oldopt < newopt)
808  {
809  if (setsockopt(port->sock, SOL_SOCKET, SO_SNDBUF, (char *) &newopt,
810  sizeof(newopt)) < 0)
811  {
812  elog(LOG, "setsockopt(%s) failed: %m", "SO_SNDBUF");
813  return STATUS_ERROR;
814  }
815  }
816 #endif
817 
818  /*
819  * Also apply the current keepalive parameters. If we fail to set a
820  * parameter, don't error out, because these aren't universally
821  * supported. (Note: you might think we need to reset the GUC
822  * variables to 0 in such a case, but it's not necessary because the
823  * show hooks for these variables report the truth anyway.)
824  */
828  }
829 
830  return STATUS_OK;
831 }
#define accept(s, addr, addrlen)
Definition: win32_port.h:445
int pq_setkeepalivesinterval(int interval, Port *port)
Definition: pqcomm.c:1812
struct sockaddr_storage addr
Definition: pqcomm.h:64
#define STATUS_ERROR
Definition: c.h:954
#define LOG
Definition: elog.h:26
pgsocket sock
Definition: libpq-be.h:118
int tcp_keepalives_idle
Definition: guc.c:472
SockAddr raddr
Definition: libpq-be.h:122
void pg_usleep(long microsec)
Definition: signal.c:53
int pq_setkeepalivesidle(int idle, Port *port)
Definition: pqcomm.c:1730
#define IS_AF_UNIX(fam)
Definition: ip.h:24
ACCEPT_TYPE_ARG3 salen
Definition: pqcomm.h:65
#define ereport(elevel, rest)
Definition: elog.h:122
#define STATUS_OK
Definition: c.h:953
int tcp_keepalives_interval
Definition: guc.c:473
int errcode_for_socket_access(void)
Definition: elog.c:669
SockAddr laddr
Definition: libpq-be.h:121
#define PGINVALID_SOCKET
Definition: port.h:33
int pq_setkeepalivescount(int count, Port *port)
Definition: pqcomm.c:1888
int errmsg(const char *fmt,...)
Definition: elog.c:797
int tcp_keepalives_count
Definition: guc.c:474
#define elog
Definition: elog.h:219
#define PQ_SEND_BUFFER_SIZE
Definition: pqcomm.c:134

◆ StreamServerPort()

int StreamServerPort ( int  family,
char *  hostName,
unsigned short  portNumber,
char *  unixSocketDir,
pgsocket  ListenSocket[],
int  MaxListen 
)

Definition at line 330 of file pqcomm.c.

References _, addrinfo::ai_family, addrinfo::ai_flags, addrinfo::ai_next, AI_PASSIVE, addrinfo::ai_socktype, Assert, bind, closesocket, CreateSocketLockFile(), elog, ereport, errcode_for_file_access(), errcode_for_socket_access(), errhint(), errmsg(), fd(), gai_strerror, IS_AF_UNIX, lappend(), listen, LOG, MaxBackends, MAXPGPATH, MemSet, NI_MAXHOST, NI_NUMERICHOST, pg_freeaddrinfo_all(), pg_getaddrinfo_all(), pg_getnameinfo_all(), PG_SOMAXCONN, PGINVALID_SOCKET, pstrdup(), snprintf(), socket, STATUS_ERROR, STATUS_OK, Unix_socket_group, Unix_socket_permissions, UNIXSOCK_PATH, UNIXSOCK_PATH_BUFLEN, val, and WARNING.

Referenced by PostmasterMain().

333 {
334  pgsocket fd;
335  int err;
336  int maxconn;
337  int ret;
338  char portNumberStr[32];
339  const char *familyDesc;
340  char familyDescBuf[64];
341  const char *addrDesc;
342  char addrBuf[NI_MAXHOST];
343  char *service;
344  struct addrinfo *addrs = NULL,
345  *addr;
346  struct addrinfo hint;
347  int listen_index = 0;
348  int added = 0;
349 
350 #ifdef HAVE_UNIX_SOCKETS
351  char unixSocketPath[MAXPGPATH];
352 #endif
353 #if !defined(WIN32) || defined(IPV6_V6ONLY)
354  int one = 1;
355 #endif
356 
357  /* Initialize hint structure */
358  MemSet(&hint, 0, sizeof(hint));
359  hint.ai_family = family;
360  hint.ai_flags = AI_PASSIVE;
361  hint.ai_socktype = SOCK_STREAM;
362 
363 #ifdef HAVE_UNIX_SOCKETS
364  if (family == AF_UNIX)
365  {
366  /*
367  * Create unixSocketPath from portNumber and unixSocketDir and lock
368  * that file path
369  */
370  UNIXSOCK_PATH(unixSocketPath, portNumber, unixSocketDir);
371  if (strlen(unixSocketPath) >= UNIXSOCK_PATH_BUFLEN)
372  {
373  ereport(LOG,
374  (errmsg("Unix-domain socket path \"%s\" is too long (maximum %d bytes)",
375  unixSocketPath,
376  (int) (UNIXSOCK_PATH_BUFLEN - 1))));
377  return STATUS_ERROR;
378  }
379  if (Lock_AF_UNIX(unixSocketDir, unixSocketPath) != STATUS_OK)
380  return STATUS_ERROR;
381  service = unixSocketPath;
382  }
383  else
384 #endif /* HAVE_UNIX_SOCKETS */
385  {
386  snprintf(portNumberStr, sizeof(portNumberStr), "%d", portNumber);
387  service = portNumberStr;
388  }
389 
390  ret = pg_getaddrinfo_all(hostName, service, &hint, &addrs);
391  if (ret || !addrs)
392  {
393  if (hostName)
394  ereport(LOG,
395  (errmsg("could not translate host name \"%s\", service \"%s\" to address: %s",
396  hostName, service, gai_strerror(ret))));
397  else
398  ereport(LOG,
399  (errmsg("could not translate service \"%s\" to address: %s",
400  service, gai_strerror(ret))));
401  if (addrs)
402  pg_freeaddrinfo_all(hint.ai_family, addrs);
403  return STATUS_ERROR;
404  }
405 
406  for (addr = addrs; addr; addr = addr->ai_next)
407  {
408  if (!IS_AF_UNIX(family) && IS_AF_UNIX(addr->ai_family))
409  {
410  /*
411  * Only set up a unix domain socket when they really asked for it.
412  * The service/port is different in that case.
413  */
414  continue;
415  }
416 
417  /* See if there is still room to add 1 more socket. */
418  for (; listen_index < MaxListen; listen_index++)
419  {
420  if (ListenSocket[listen_index] == PGINVALID_SOCKET)
421  break;
422  }
423  if (listen_index >= MaxListen)
424  {
425  ereport(LOG,
426  (errmsg("could not bind to all requested addresses: MAXLISTEN (%d) exceeded",
427  MaxListen)));
428  break;
429  }
430 
431  /* set up address family name for log messages */
432  switch (addr->ai_family)
433  {
434  case AF_INET:
435  familyDesc = _("IPv4");
436  break;
437 #ifdef HAVE_IPV6
438  case AF_INET6:
439  familyDesc = _("IPv6");
440  break;
441 #endif
442 #ifdef HAVE_UNIX_SOCKETS
443  case AF_UNIX:
444  familyDesc = _("Unix");
445  break;
446 #endif
447  default:
448  snprintf(familyDescBuf, sizeof(familyDescBuf),
449  _("unrecognized address family %d"),
450  addr->ai_family);
451  familyDesc = familyDescBuf;
452  break;
453  }
454 
455  /* set up text form of address for log messages */
456 #ifdef HAVE_UNIX_SOCKETS
457  if (addr->ai_family == AF_UNIX)
458  addrDesc = unixSocketPath;
459  else
460 #endif
461  {
462  pg_getnameinfo_all((const struct sockaddr_storage *) addr->ai_addr,
463  addr->ai_addrlen,
464  addrBuf, sizeof(addrBuf),
465  NULL, 0,
467  addrDesc = addrBuf;
468  }
469 
470  if ((fd = socket(addr->ai_family, SOCK_STREAM, 0)) == PGINVALID_SOCKET)
471  {
472  ereport(LOG,
474  /* translator: first %s is IPv4, IPv6, or Unix */
475  errmsg("could not create %s socket for address \"%s\": %m",
476  familyDesc, addrDesc)));
477  continue;
478  }
479 
480 #ifndef WIN32
481 
482  /*
483  * Without the SO_REUSEADDR flag, a new postmaster can't be started
484  * right away after a stop or crash, giving "address already in use"
485  * error on TCP ports.
486  *
487  * On win32, however, this behavior only happens if the
488  * SO_EXLUSIVEADDRUSE is set. With SO_REUSEADDR, win32 allows multiple
489  * servers to listen on the same address, resulting in unpredictable
490  * behavior. With no flags at all, win32 behaves as Unix with
491  * SO_REUSEADDR.
492  */
493  if (!IS_AF_UNIX(addr->ai_family))
494  {
495  if ((setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
496  (char *) &one, sizeof(one))) == -1)
497  {
498  ereport(LOG,
500  /* translator: first %s is IPv4, IPv6, or Unix */
501  errmsg("setsockopt(SO_REUSEADDR) failed for %s address \"%s\": %m",
502  familyDesc, addrDesc)));
503  closesocket(fd);
504  continue;
505  }
506  }
507 #endif
508 
509 #ifdef IPV6_V6ONLY
510  if (addr->ai_family == AF_INET6)
511  {
512  if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY,
513  (char *) &one, sizeof(one)) == -1)
514  {
515  ereport(LOG,
517  /* translator: first %s is IPv4, IPv6, or Unix */
518  errmsg("setsockopt(IPV6_V6ONLY) failed for %s address \"%s\": %m",
519  familyDesc, addrDesc)));
520  closesocket(fd);
521  continue;
522  }
523  }
524 #endif
525 
526  /*
527  * Note: This might fail on some OS's, like Linux older than
528  * 2.4.21-pre3, that don't have the IPV6_V6ONLY socket option, and map
529  * ipv4 addresses to ipv6. It will show ::ffff:ipv4 for all ipv4
530  * connections.
531  */
532  err = bind(fd, addr->ai_addr, addr->ai_addrlen);
533  if (err < 0)
534  {
535  ereport(LOG,
537  /* translator: first %s is IPv4, IPv6, or Unix */
538  errmsg("could not bind %s address \"%s\": %m",
539  familyDesc, addrDesc),
540  (IS_AF_UNIX(addr->ai_family)) ?
541  errhint("Is another postmaster already running on port %d?"
542  " If not, remove socket file \"%s\" and retry.",
543  (int) portNumber, service) :
544  errhint("Is another postmaster already running on port %d?"
545  " If not, wait a few seconds and retry.",
546  (int) portNumber)));
547  closesocket(fd);
548  continue;
549  }
550 
551 #ifdef HAVE_UNIX_SOCKETS
552  if (addr->ai_family == AF_UNIX)
553  {
554  if (Setup_AF_UNIX(service) != STATUS_OK)
555  {
556  closesocket(fd);
557  break;
558  }
559  }
560 #endif
561 
562  /*
563  * Select appropriate accept-queue length limit. PG_SOMAXCONN is only
564  * intended to provide a clamp on the request on platforms where an
565  * overly large request provokes a kernel error (are there any?).
566  */
567  maxconn = MaxBackends * 2;
568  if (maxconn > PG_SOMAXCONN)
569  maxconn = PG_SOMAXCONN;
570 
571  err = listen(fd, maxconn);
572  if (err < 0)
573  {
574  ereport(LOG,
576  /* translator: first %s is IPv4, IPv6, or Unix */
577  errmsg("could not listen on %s address \"%s\": %m",
578  familyDesc, addrDesc)));
579  closesocket(fd);
580  continue;
581  }
582 
583 #ifdef HAVE_UNIX_SOCKETS
584  if (addr->ai_family == AF_UNIX)
585  ereport(LOG,
586  (errmsg("listening on Unix socket \"%s\"",
587  addrDesc)));
588  else
589 #endif
590  ereport(LOG,
591  /* translator: first %s is IPv4 or IPv6 */
592  (errmsg("listening on %s address \"%s\", port %d",
593  familyDesc, addrDesc, (int) portNumber)));
594 
595  ListenSocket[listen_index] = fd;
596  added++;
597  }
598 
599  pg_freeaddrinfo_all(hint.ai_family, addrs);
600 
601  if (!added)
602  return STATUS_ERROR;
603 
604  return STATUS_OK;
605 }
void pg_freeaddrinfo_all(int hint_ai_family, struct addrinfo *ai)
Definition: ip.c:88
#define UNIXSOCK_PATH(path, port, sockdir)
Definition: pqcomm.h:70
int errhint(const char *fmt,...)
Definition: elog.c:987
#define NI_NUMERICHOST
Definition: getaddrinfo.h:78
#define UNIXSOCK_PATH_BUFLEN
Definition: pqcomm.h:86
#define closesocket
Definition: port.h:292
#define STATUS_ERROR
Definition: c.h:954
#define MemSet(start, val, len)
Definition: c.h:853
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
#define LOG
Definition: elog.h:26
#define bind(s, addr, addrlen)
Definition: win32_port.h:443
static int fd(const char *x, int i)
Definition: preproc-init.c:105
#define gai_strerror
Definition: getaddrinfo.h:146
int pg_getaddrinfo_all(const char *hostname, const char *servname, const struct addrinfo *hintp, struct addrinfo **result)
Definition: ip.c:57
#define NI_MAXHOST
Definition: getaddrinfo.h:88
#define IS_AF_UNIX(fam)
Definition: ip.h:24
#define MAXPGPATH
int MaxBackends
Definition: globals.c:126
#define AI_PASSIVE
Definition: getaddrinfo.h:62
int pgsocket
Definition: port.h:31
#define ereport(elevel, rest)
Definition: elog.h:122
#define STATUS_OK
Definition: c.h:953
int errcode_for_socket_access(void)
Definition: elog.c:669
#define listen(s, backlog)
Definition: win32_port.h:444
static pgsocket ListenSocket[MAXLISTEN]
Definition: postmaster.c:215
#define socket(af, type, protocol)
Definition: win32_port.h:442
#define PGINVALID_SOCKET
Definition: port.h:33
#define PG_SOMAXCONN
int pg_getnameinfo_all(const struct sockaddr_storage *addr, int salen, char *node, int nodelen, char *service, int servicelen, int flags)
Definition: ip.c:122
struct addrinfo * ai_next
Definition: getaddrinfo.h:107
int errmsg(const char *fmt,...)
Definition: elog.c:797
#define _(x)
Definition: elog.c:84

◆ TouchSocketFiles()

void TouchSocketFiles ( void  )

Definition at line 859 of file pqcomm.c.

References lfirst.

Referenced by ServerLoop().

860 {
861  ListCell *l;
862 
863  /* Loop through all created sockets... */
864  foreach(l, sock_paths)
865  {
866  char *sock_path = (char *) lfirst(l);
867 
868  /*
869  * utime() is POSIX standard, utimes() is a common alternative. If we
870  * have neither, there's no way to affect the mod or access time of
871  * the socket :-(
872  *
873  * In either path, we ignore errors; there's no point in complaining.
874  */
875 #ifdef HAVE_UTIME
876  utime(sock_path, NULL);
877 #else /* !HAVE_UTIME */
878 #ifdef HAVE_UTIMES
879  utimes(sock_path, NULL);
880 #endif /* HAVE_UTIMES */
881 #endif /* HAVE_UTIME */
882  }
883 }
static List * sock_paths
Definition: pqcomm.c:125
#define lfirst(lc)
Definition: pg_list.h:106

Variable Documentation

◆ DoingCopyOut

bool DoingCopyOut
static

◆ FeBeWaitSet

WaitEventSet* FeBeWaitSet

Definition at line 186 of file pqcomm.c.

Referenced by secure_read(), secure_write(), SwitchBackToLocalLatch(), and SwitchToSharedLatch().

◆ PqCommBusy

bool PqCommBusy
static

◆ PqCommMethods

Definition at line 184 of file pqcomm.c.

Referenced by pq_redirect_to_shm_mq(), and pq_set_parallel_master().

◆ PqCommReadingMsg

◆ PqCommSocketMethods

PQcommMethods PqCommSocketMethods
static
Initial value:
= {
}
static int socket_flush_if_writable(void)
Definition: pqcomm.c:1495
static bool socket_is_send_pending(void)
Definition: pqcomm.c:1521
static void socket_comm_reset(void)
Definition: pqcomm.c:239
static void socket_startcopyout(void)
Definition: pqcomm.c:1620
static void socket_endcopyout(bool errorAbort)
Definition: pqcomm.c:1636
static int socket_putmessage(char msgtype, const char *s, size_t len)
Definition: pqcomm.c:1560
static int socket_flush(void)
Definition: pqcomm.c:1400
static void socket_putmessage_noblock(char msgtype, const char *s, size_t len)
Definition: pqcomm.c:1593

Definition at line 173 of file pqcomm.c.

◆ PqRecvBuffer

char PqRecvBuffer[PQ_RECV_BUFFER_SIZE]
static

◆ PqRecvLength

int PqRecvLength
static

◆ PqRecvPointer

int PqRecvPointer
static

◆ PqSendBuffer

char* PqSendBuffer
static

Definition at line 137 of file pqcomm.c.

Referenced by internal_flush(), internal_putbytes(), pq_init(), and socket_putmessage_noblock().

◆ PqSendBufferSize

int PqSendBufferSize
static

Definition at line 138 of file pqcomm.c.

Referenced by internal_putbytes(), pq_init(), and socket_putmessage_noblock().

◆ PqSendPointer

◆ PqSendStart

int PqSendStart
static

◆ sock_paths

List* sock_paths = NIL
static

Definition at line 125 of file pqcomm.c.

◆ Unix_socket_group

char* Unix_socket_group

Definition at line 122 of file pqcomm.c.

Referenced by StreamServerPort().

◆ Unix_socket_permissions

int Unix_socket_permissions

Definition at line 121 of file pqcomm.c.

Referenced by show_unix_socket_permissions(), and StreamServerPort().