PostgreSQL Source Code  git master
pqcomm.c File Reference
#include "postgres.h"
#include <poll.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 <netinet/tcp.h>
#include <utime.h>
#include "common/ip.h"
#include "libpq/libpq.h"
#include "miscadmin.h"
#include "port/pg_bswap.h"
#include "storage/ipc.h"
#include "utils/guc_hooks.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 int internal_putbytes (const char *s, size_t len)
 
static int internal_flush (void)
 
static int Lock_AF_UNIX (const char *unixSocketDir, const char *unixSocketPath)
 
static int Setup_AF_UNIX (const char *sock_path)
 
void pq_init (void)
 
int StreamServerPort (int family, const char *hostName, unsigned short portNumber, const 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)
 
bool pq_buffer_has_data (void)
 
void pq_startmsgread (void)
 
void pq_endmsgread (void)
 
bool pq_is_reading_msg (void)
 
int pq_getmessage (StringInfo s, int maxlen)
 
int pq_putmessage_v2 (char msgtype, 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)
 
int pq_gettcpusertimeout (Port *port)
 
int pq_settcpusertimeout (int timeout, Port *port)
 
void assign_tcp_keepalives_idle (int newval, void *extra)
 
const char * show_tcp_keepalives_idle (void)
 
void assign_tcp_keepalives_interval (int newval, void *extra)
 
const char * show_tcp_keepalives_interval (void)
 
void assign_tcp_keepalives_count (int newval, void *extra)
 
const char * show_tcp_keepalives_count (void)
 
void assign_tcp_user_timeout (int newval, void *extra)
 
const char * show_tcp_user_timeout (void)
 
bool pq_check_connection (void)
 

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 const PQcommMethods PqCommSocketMethods
 
const PQcommMethodsPqCommMethods = &PqCommSocketMethods
 
WaitEventSetFeBeWaitSet
 

Macro Definition Documentation

◆ PQ_RECV_BUFFER_SIZE

#define PQ_RECV_BUFFER_SIZE   8192

Definition at line 120 of file pqcomm.c.

◆ PQ_SEND_BUFFER_SIZE

#define PQ_SEND_BUFFER_SIZE   8192

Definition at line 119 of file pqcomm.c.

Function Documentation

◆ assign_tcp_keepalives_count()

void assign_tcp_keepalives_count ( int  newval,
void *  extra 
)

Definition at line 1977 of file pqcomm.c.

1978 {
1979  /* See comments in assign_tcp_keepalives_idle */
1981 }
struct Port * MyProcPort
Definition: globals.c:47
#define newval
int pq_setkeepalivescount(int count, Port *port)
Definition: pqcomm.c:1798

References MyProcPort, newval, and pq_setkeepalivescount().

◆ assign_tcp_keepalives_idle()

void assign_tcp_keepalives_idle ( int  newval,
void *  extra 
)

Definition at line 1921 of file pqcomm.c.

1922 {
1923  /*
1924  * The kernel API provides no way to test a value without setting it; and
1925  * once we set it we might fail to unset it. So there seems little point
1926  * in fully implementing the check-then-assign GUC API for these
1927  * variables. Instead we just do the assignment on demand.
1928  * pq_setkeepalivesidle reports any problems via ereport(LOG).
1929  *
1930  * This approach means that the GUC value might have little to do with the
1931  * actual kernel value, so we use a show_hook that retrieves the kernel
1932  * value rather than trusting GUC's copy.
1933  */
1935 }
int pq_setkeepalivesidle(int idle, Port *port)
Definition: pqcomm.c:1634

References MyProcPort, newval, and pq_setkeepalivesidle().

◆ assign_tcp_keepalives_interval()

void assign_tcp_keepalives_interval ( int  newval,
void *  extra 
)

Definition at line 1954 of file pqcomm.c.

1955 {
1956  /* See comments in assign_tcp_keepalives_idle */
1958 }
int pq_setkeepalivesinterval(int interval, Port *port)
Definition: pqcomm.c:1719

References MyProcPort, newval, and pq_setkeepalivesinterval().

◆ assign_tcp_user_timeout()

void assign_tcp_user_timeout ( int  newval,
void *  extra 
)

Definition at line 2000 of file pqcomm.c.

2001 {
2002  /* See comments in assign_tcp_keepalives_idle */
2004 }
int pq_settcpusertimeout(int timeout, Port *port)
Definition: pqcomm.c:1873

References MyProcPort, newval, and pq_settcpusertimeout().

◆ internal_flush()

static int internal_flush ( void  )
static

Definition at line 1329 of file pqcomm.c.

1330 {
1331  static int last_reported_send_errno = 0;
1332 
1333  char *bufptr = PqSendBuffer + PqSendStart;
1334  char *bufend = PqSendBuffer + PqSendPointer;
1335 
1336  while (bufptr < bufend)
1337  {
1338  int r;
1339 
1340  r = secure_write(MyProcPort, bufptr, bufend - bufptr);
1341 
1342  if (r <= 0)
1343  {
1344  if (errno == EINTR)
1345  continue; /* Ok if we were interrupted */
1346 
1347  /*
1348  * Ok if no data writable without blocking, and the socket is in
1349  * non-blocking mode.
1350  */
1351  if (errno == EAGAIN ||
1352  errno == EWOULDBLOCK)
1353  {
1354  return 0;
1355  }
1356 
1357  /*
1358  * Careful: an ereport() that tries to write to the client would
1359  * cause recursion to here, leading to stack overflow and core
1360  * dump! This message must go *only* to the postmaster log.
1361  *
1362  * If a client disconnects while we're in the midst of output, we
1363  * might write quite a bit of data before we get to a safe query
1364  * abort point. So, suppress duplicate log messages.
1365  */
1366  if (errno != last_reported_send_errno)
1367  {
1368  last_reported_send_errno = errno;
1371  errmsg("could not send data to client: %m")));
1372  }
1373 
1374  /*
1375  * We drop the buffered data anyway so that processing can
1376  * continue, even though we'll probably quit soon. We also set a
1377  * flag that'll cause the next CHECK_FOR_INTERRUPTS to terminate
1378  * the connection.
1379  */
1380  PqSendStart = PqSendPointer = 0;
1382  InterruptPending = 1;
1383  return EOF;
1384  }
1385 
1386  last_reported_send_errno = 0; /* reset after any successful send */
1387  bufptr += r;
1388  PqSendStart += r;
1389  }
1390 
1391  PqSendStart = PqSendPointer = 0;
1392  return 0;
1393 }
ssize_t secure_write(Port *port, void *ptr, size_t len)
Definition: be-secure.c:258
int errcode_for_socket_access(void)
Definition: elog.c:829
int errmsg(const char *fmt,...)
Definition: elog.c:946
#define COMMERROR
Definition: elog.h:29
#define ereport(elevel,...)
Definition: elog.h:145
volatile sig_atomic_t InterruptPending
Definition: globals.c:30
volatile sig_atomic_t ClientConnectionLost
Definition: globals.c:34
static int PqSendStart
Definition: pqcomm.c:125
static int PqSendPointer
Definition: pqcomm.c:124
static char * PqSendBuffer
Definition: pqcomm.c:122
#define EINTR
Definition: win32_port.h:369
#define EWOULDBLOCK
Definition: win32_port.h:375
#define EAGAIN
Definition: win32_port.h:367

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().

◆ internal_putbytes()

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

Definition at line 1276 of file pqcomm.c.

1277 {
1278  size_t amount;
1279 
1280  while (len > 0)
1281  {
1282  /* If buffer is full, then flush it out */
1284  {
1285  socket_set_nonblocking(false);
1286  if (internal_flush())
1287  return EOF;
1288  }
1289  amount = PqSendBufferSize - PqSendPointer;
1290  if (amount > len)
1291  amount = len;
1292  memcpy(PqSendBuffer + PqSendPointer, s, amount);
1293  PqSendPointer += amount;
1294  s += amount;
1295  len -= amount;
1296  }
1297  return 0;
1298 }
const void size_t len
static int internal_flush(void)
Definition: pqcomm.c:1329
static void socket_set_nonblocking(bool nonblocking)
Definition: pqcomm.c:892
static int PqSendBufferSize
Definition: pqcomm.c:123

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

Referenced by pq_putmessage_v2(), and socket_putmessage().

◆ Lock_AF_UNIX()

static int Lock_AF_UNIX ( const char *  unixSocketDir,
const char *  unixSocketPath 
)
static

Definition at line 583 of file pqcomm.c.

584 {
585  /* no lock file for abstract sockets */
586  if (unixSocketPath[0] == '@')
587  return STATUS_OK;
588 
589  /*
590  * Grab an interlock file associated with the socket file.
591  *
592  * Note: there are two reasons for using a socket lock file, rather than
593  * trying to interlock directly on the socket itself. First, it's a lot
594  * more portable, and second, it lets us remove any pre-existing socket
595  * file without race conditions.
596  */
597  CreateSocketLockFile(unixSocketPath, true, unixSocketDir);
598 
599  /*
600  * Once we have the interlock, we can safely delete any pre-existing
601  * socket file to avoid failure at bind() time.
602  */
603  (void) unlink(unixSocketPath);
604 
605  /*
606  * Remember socket file pathnames for later maintenance.
607  */
608  sock_paths = lappend(sock_paths, pstrdup(unixSocketPath));
609 
610  return STATUS_OK;
611 }
#define STATUS_OK
Definition: c.h:1108
List * lappend(List *list, void *datum)
Definition: list.c:338
char * pstrdup(const char *in)
Definition: mcxt.c:1483
void CreateSocketLockFile(const char *socketfile, bool amPostmaster, const char *socketDir)
Definition: miscinit.c:1451
static List * sock_paths
Definition: pqcomm.c:110

References CreateSocketLockFile(), lappend(), pstrdup(), sock_paths, and STATUS_OK.

Referenced by StreamServerPort().

◆ pq_buffer_has_data()

bool pq_buffer_has_data ( void  )

Definition at line 1127 of file pqcomm.c.

1128 {
1129  return (PqRecvPointer < PqRecvLength);
1130 }
static int PqRecvLength
Definition: pqcomm.c:129
static int PqRecvPointer
Definition: pqcomm.c:128

References PqRecvLength, and PqRecvPointer.

Referenced by ProcessStartupPacket().

◆ pq_check_connection()

bool pq_check_connection ( void  )

Definition at line 2023 of file pqcomm.c.

2024 {
2025  WaitEvent events[FeBeWaitSetNEvents];
2026  int rc;
2027 
2028  /*
2029  * It's OK to modify the socket event filter without restoring, because
2030  * all FeBeWaitSet socket wait sites do the same.
2031  */
2033 
2034 retry:
2035  rc = WaitEventSetWait(FeBeWaitSet, 0, events, lengthof(events), 0);
2036  for (int i = 0; i < rc; ++i)
2037  {
2038  if (events[i].events & WL_SOCKET_CLOSED)
2039  return false;
2040  if (events[i].events & WL_LATCH_SET)
2041  {
2042  /*
2043  * A latch event might be preventing other events from being
2044  * reported. Reset it and poll again. No need to restore it
2045  * because no code should expect latches to survive across
2046  * CHECK_FOR_INTERRUPTS().
2047  */
2049  goto retry;
2050  }
2051  }
2052 
2053  return true;
2054 }
#define lengthof(array)
Definition: c.h:724
struct Latch * MyLatch
Definition: globals.c:58
int i
Definition: isn.c:73
void ModifyWaitEvent(WaitEventSet *set, int pos, uint32 events, Latch *latch)
Definition: latch.c:972
int WaitEventSetWait(WaitEventSet *set, long timeout, WaitEvent *occurred_events, int nevents, uint32 wait_event_info)
Definition: latch.c:1345
void ResetLatch(Latch *latch)
Definition: latch.c:683
#define WL_SOCKET_CLOSED
Definition: latch.h:137
#define WL_LATCH_SET
Definition: latch.h:125
#define FeBeWaitSetNEvents
Definition: libpq.h:65
#define FeBeWaitSetSocketPos
Definition: libpq.h:63
WaitEventSet * FeBeWaitSet
Definition: pqcomm.c:164

References FeBeWaitSet, FeBeWaitSetNEvents, FeBeWaitSetSocketPos, i, lengthof, ModifyWaitEvent(), MyLatch, ResetLatch(), WaitEventSetWait(), WL_LATCH_SET, and WL_SOCKET_CLOSED.

Referenced by ProcessInterrupts().

◆ pq_discardbytes()

static int pq_discardbytes ( size_t  len)
static

Definition at line 1098 of file pqcomm.c.

1099 {
1100  size_t amount;
1101 
1103 
1104  while (len > 0)
1105  {
1106  while (PqRecvPointer >= PqRecvLength)
1107  {
1108  if (pq_recvbuf()) /* If nothing in buffer, then recv some */
1109  return EOF; /* Failed to recv data */
1110  }
1111  amount = PqRecvLength - PqRecvPointer;
1112  if (amount > len)
1113  amount = len;
1114  PqRecvPointer += amount;
1115  len -= amount;
1116  }
1117  return 0;
1118 }
Assert(fmt[strlen(fmt) - 1] !='\n')
static int pq_recvbuf(void)
Definition: pqcomm.c:909
static bool PqCommReadingMsg
Definition: pqcomm.c:135

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

Referenced by pq_getmessage().

◆ pq_endmsgread()

void pq_endmsgread ( void  )

Definition at line 1164 of file pqcomm.c.

1165 {
1167 
1168  PqCommReadingMsg = false;
1169 }

References Assert(), and PqCommReadingMsg.

Referenced by ProcessRepliesIfAny(), and ProcessStartupPacket().

◆ pq_getbyte()

int pq_getbyte ( void  )

Definition at line 970 of file pqcomm.c.

971 {
973 
974  while (PqRecvPointer >= PqRecvLength)
975  {
976  if (pq_recvbuf()) /* If nothing in buffer, then recv some */
977  return EOF; /* Failed to recv data */
978  }
979  return (unsigned char) PqRecvBuffer[PqRecvPointer++];
980 }
static char PqRecvBuffer[PQ_RECV_BUFFER_SIZE]
Definition: pqcomm.c:127

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

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

◆ pq_getbyte_if_available()

int pq_getbyte_if_available ( unsigned char *  c)

Definition at line 1010 of file pqcomm.c.

1011 {
1012  int r;
1013 
1015 
1017  {
1019  return 1;
1020  }
1021 
1022  /* Put the socket into non-blocking mode */
1023  socket_set_nonblocking(true);
1024 
1025  r = secure_read(MyProcPort, c, 1);
1026  if (r < 0)
1027  {
1028  /*
1029  * Ok if no data available without blocking or interrupted (though
1030  * EINTR really shouldn't happen with a non-blocking socket). Report
1031  * other errors.
1032  */
1033  if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
1034  r = 0;
1035  else
1036  {
1037  /*
1038  * Careful: an ereport() that tries to write to the client would
1039  * cause recursion to here, leading to stack overflow and core
1040  * dump! This message must go *only* to the postmaster log.
1041  */
1044  errmsg("could not receive data from client: %m")));
1045  r = EOF;
1046  }
1047  }
1048  else if (r == 0)
1049  {
1050  /* EOF detected */
1051  r = EOF;
1052  }
1053 
1054  return r;
1055 }
ssize_t secure_read(Port *port, void *ptr, size_t len)
Definition: be-secure.c:145
char * 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().

◆ pq_getbytes()

int pq_getbytes ( char *  s,
size_t  len 
)

Definition at line 1064 of file pqcomm.c.

1065 {
1066  size_t amount;
1067 
1069 
1070  while (len > 0)
1071  {
1072  while (PqRecvPointer >= PqRecvLength)
1073  {
1074  if (pq_recvbuf()) /* If nothing in buffer, then recv some */
1075  return EOF; /* Failed to recv data */
1076  }
1077  amount = PqRecvLength - PqRecvPointer;
1078  if (amount > len)
1079  amount = len;
1080  memcpy(s, PqRecvBuffer + PqRecvPointer, amount);
1081  PqRecvPointer += amount;
1082  s += amount;
1083  len -= amount;
1084  }
1085  return 0;
1086 }

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

Referenced by pq_getmessage(), and ProcessStartupPacket().

◆ pq_getkeepalivescount()

int pq_getkeepalivescount ( Port port)

Definition at line 1768 of file pqcomm.c.

1769 {
1770 #ifdef TCP_KEEPCNT
1771  if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1772  return 0;
1773 
1774  if (port->keepalives_count != 0)
1775  return port->keepalives_count;
1776 
1777  if (port->default_keepalives_count == 0)
1778  {
1779  socklen_t size = sizeof(port->default_keepalives_count);
1780 
1781  if (getsockopt(port->sock, IPPROTO_TCP, TCP_KEEPCNT,
1782  (char *) &port->default_keepalives_count,
1783  &size) < 0)
1784  {
1785  ereport(LOG,
1786  (errmsg("%s(%s) failed: %m", "getsockopt", "TCP_KEEPCNT")));
1787  port->default_keepalives_count = -1; /* don't know */
1788  }
1789  }
1790 
1791  return port->default_keepalives_count;
1792 #else
1793  return 0;
1794 #endif
1795 }
#define LOG
Definition: elog.h:27
static int port
Definition: pg_regress.c:90
unsigned int socklen_t
Definition: port.h:40

References ereport, errmsg(), LOG, and port.

Referenced by pq_setkeepalivescount(), and show_tcp_keepalives_count().

◆ pq_getkeepalivesidle()

int pq_getkeepalivesidle ( Port port)

Definition at line 1599 of file pqcomm.c.

1600 {
1601 #if defined(PG_TCP_KEEPALIVE_IDLE) || defined(SIO_KEEPALIVE_VALS)
1602  if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1603  return 0;
1604 
1605  if (port->keepalives_idle != 0)
1606  return port->keepalives_idle;
1607 
1608  if (port->default_keepalives_idle == 0)
1609  {
1610 #ifndef WIN32
1611  socklen_t size = sizeof(port->default_keepalives_idle);
1612 
1613  if (getsockopt(port->sock, IPPROTO_TCP, PG_TCP_KEEPALIVE_IDLE,
1614  (char *) &port->default_keepalives_idle,
1615  &size) < 0)
1616  {
1617  ereport(LOG,
1618  (errmsg("%s(%s) failed: %m", "getsockopt", PG_TCP_KEEPALIVE_IDLE_STR)));
1619  port->default_keepalives_idle = -1; /* don't know */
1620  }
1621 #else /* WIN32 */
1622  /* We can't get the defaults on Windows, so return "don't know" */
1623  port->default_keepalives_idle = -1;
1624 #endif /* WIN32 */
1625  }
1626 
1627  return port->default_keepalives_idle;
1628 #else
1629  return 0;
1630 #endif
1631 }

References ereport, errmsg(), LOG, and port.

Referenced by pq_setkeepalivesidle(), and show_tcp_keepalives_idle().

◆ pq_getkeepalivesinterval()

int pq_getkeepalivesinterval ( Port port)

Definition at line 1684 of file pqcomm.c.

1685 {
1686 #if defined(TCP_KEEPINTVL) || defined(SIO_KEEPALIVE_VALS)
1687  if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1688  return 0;
1689 
1690  if (port->keepalives_interval != 0)
1691  return port->keepalives_interval;
1692 
1693  if (port->default_keepalives_interval == 0)
1694  {
1695 #ifndef WIN32
1696  socklen_t size = sizeof(port->default_keepalives_interval);
1697 
1698  if (getsockopt(port->sock, IPPROTO_TCP, TCP_KEEPINTVL,
1699  (char *) &port->default_keepalives_interval,
1700  &size) < 0)
1701  {
1702  ereport(LOG,
1703  (errmsg("%s(%s) failed: %m", "getsockopt", "TCP_KEEPINTVL")));
1704  port->default_keepalives_interval = -1; /* don't know */
1705  }
1706 #else
1707  /* We can't get the defaults on Windows, so return "don't know" */
1708  port->default_keepalives_interval = -1;
1709 #endif /* WIN32 */
1710  }
1711 
1712  return port->default_keepalives_interval;
1713 #else
1714  return 0;
1715 #endif
1716 }

References ereport, errmsg(), LOG, and port.

Referenced by pq_setkeepalivesinterval(), and show_tcp_keepalives_interval().

◆ pq_getmessage()

int pq_getmessage ( StringInfo  s,
int  maxlen 
)

Definition at line 1202 of file pqcomm.c.

1203 {
1204  int32 len;
1205 
1207 
1208  resetStringInfo(s);
1209 
1210  /* Read message length word */
1211  if (pq_getbytes((char *) &len, 4) == EOF)
1212  {
1214  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1215  errmsg("unexpected EOF within message length word")));
1216  return EOF;
1217  }
1218 
1219  len = pg_ntoh32(len);
1220 
1221  if (len < 4 || len > maxlen)
1222  {
1224  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1225  errmsg("invalid message length")));
1226  return EOF;
1227  }
1228 
1229  len -= 4; /* discount length itself */
1230 
1231  if (len > 0)
1232  {
1233  /*
1234  * Allocate space for message. If we run out of room (ridiculously
1235  * large message), we will elog(ERROR), but we want to discard the
1236  * message body so as not to lose communication sync.
1237  */
1238  PG_TRY();
1239  {
1240  enlargeStringInfo(s, len);
1241  }
1242  PG_CATCH();
1243  {
1244  if (pq_discardbytes(len) == EOF)
1246  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1247  errmsg("incomplete message from client")));
1248 
1249  /* we discarded the rest of the message so we're back in sync. */
1250  PqCommReadingMsg = false;
1251  PG_RE_THROW();
1252  }
1253  PG_END_TRY();
1254 
1255  /* And grab the message */
1256  if (pq_getbytes(s->data, len) == EOF)
1257  {
1259  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1260  errmsg("incomplete message from client")));
1261  return EOF;
1262  }
1263  s->len = len;
1264  /* Place a trailing null per StringInfo convention */
1265  s->data[len] = '\0';
1266  }
1267 
1268  /* finished reading the message. */
1269  PqCommReadingMsg = false;
1270 
1271  return 0;
1272 }
signed int int32
Definition: c.h:430
int errcode(int sqlerrcode)
Definition: elog.c:735
#define PG_RE_THROW()
Definition: elog.h:350
#define PG_TRY(...)
Definition: elog.h:309
#define PG_END_TRY(...)
Definition: elog.h:334
#define PG_CATCH(...)
Definition: elog.h:319
#define pg_ntoh32(x)
Definition: pg_bswap.h:125
static int pq_discardbytes(size_t len)
Definition: pqcomm.c:1098
int pq_getbytes(char *s, size_t len)
Definition: pqcomm.c:1064
void resetStringInfo(StringInfo str)
Definition: stringinfo.c:75
void enlargeStringInfo(StringInfo str, int needed)
Definition: stringinfo.c:283

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

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

◆ pq_gettcpusertimeout()

int pq_gettcpusertimeout ( Port port)

Definition at line 1843 of file pqcomm.c.

1844 {
1845 #ifdef TCP_USER_TIMEOUT
1846  if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1847  return 0;
1848 
1849  if (port->tcp_user_timeout != 0)
1850  return port->tcp_user_timeout;
1851 
1852  if (port->default_tcp_user_timeout == 0)
1853  {
1854  socklen_t size = sizeof(port->default_tcp_user_timeout);
1855 
1856  if (getsockopt(port->sock, IPPROTO_TCP, TCP_USER_TIMEOUT,
1857  (char *) &port->default_tcp_user_timeout,
1858  &size) < 0)
1859  {
1860  ereport(LOG,
1861  (errmsg("%s(%s) failed: %m", "getsockopt", "TCP_USER_TIMEOUT")));
1862  port->default_tcp_user_timeout = -1; /* don't know */
1863  }
1864  }
1865 
1866  return port->default_tcp_user_timeout;
1867 #else
1868  return 0;
1869 #endif
1870 }

References ereport, errmsg(), LOG, and port.

Referenced by pq_settcpusertimeout(), and show_tcp_user_timeout().

◆ pq_init()

void pq_init ( void  )

Definition at line 172 of file pqcomm.c.

173 {
174  int socket_pos PG_USED_FOR_ASSERTS_ONLY;
175  int latch_pos PG_USED_FOR_ASSERTS_ONLY;
176 
177  /* initialize state variables */
181  PqCommBusy = false;
182  PqCommReadingMsg = false;
183 
184  /* set up process-exit hook to close the socket */
186 
187  /*
188  * In backends (as soon as forked) we operate the underlying socket in
189  * nonblocking mode and use latches to implement blocking semantics if
190  * needed. That allows us to provide safely interruptible reads and
191  * writes.
192  *
193  * Use COMMERROR on failure, because ERROR would try to send the error to
194  * the client, which might require changing the mode again, leading to
195  * infinite recursion.
196  */
197 #ifndef WIN32
200  (errmsg("could not set socket to nonblocking mode: %m")));
201 #endif
202 
205  MyProcPort->sock, NULL, NULL);
207  MyLatch, NULL);
209  NULL, NULL);
210 
211  /*
212  * The event positions match the order we added them, but let's sanity
213  * check them to be sure.
214  */
215  Assert(socket_pos == FeBeWaitSetSocketPos);
216  Assert(latch_pos == FeBeWaitSetLatchPos);
217 }
#define PG_USED_FOR_ASSERTS_ONLY
Definition: c.h:166
void on_proc_exit(pg_on_exit_callback function, Datum arg)
Definition: ipc.c:305
WaitEventSet * CreateWaitEventSet(MemoryContext context, int nevents)
Definition: latch.c:707
int AddWaitEventToSet(WaitEventSet *set, uint32 events, pgsocket fd, Latch *latch, void *user_data)
Definition: latch.c:886
#define WL_POSTMASTER_DEATH
Definition: latch.h:129
#define WL_SOCKET_WRITEABLE
Definition: latch.h:127
#define FeBeWaitSetLatchPos
Definition: libpq.h:64
MemoryContext TopMemoryContext
Definition: mcxt.c:130
void * MemoryContextAlloc(MemoryContext context, Size size)
Definition: mcxt.c:994
bool pg_set_noblock(pgsocket sock)
Definition: noblock.c:25
#define PGINVALID_SOCKET
Definition: port.h:31
#define PQ_SEND_BUFFER_SIZE
Definition: pqcomm.c:119
static bool PqCommBusy
Definition: pqcomm.c:134
static void socket_close(int code, Datum arg)
Definition: pqcomm.c:243
pgsocket sock
Definition: libpq-be.h:147

References AddWaitEventToSet(), Assert(), COMMERROR, CreateWaitEventSet(), ereport, errmsg(), FeBeWaitSet, FeBeWaitSetLatchPos, FeBeWaitSetNEvents, FeBeWaitSetSocketPos, MemoryContextAlloc(), MyLatch, MyProcPort, on_proc_exit(), pg_set_noblock(), PG_USED_FOR_ASSERTS_ONLY, PGINVALID_SOCKET, 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().

◆ pq_is_reading_msg()

bool pq_is_reading_msg ( void  )

Definition at line 1180 of file pqcomm.c.

1181 {
1182  return PqCommReadingMsg;
1183 }

References PqCommReadingMsg.

Referenced by PostgresMain().

◆ pq_peekbyte()

int pq_peekbyte ( void  )

Definition at line 989 of file pqcomm.c.

990 {
992 
993  while (PqRecvPointer >= PqRecvLength)
994  {
995  if (pq_recvbuf()) /* If nothing in buffer, then recv some */
996  return EOF; /* Failed to recv data */
997  }
998  return (unsigned char) PqRecvBuffer[PqRecvPointer];
999 }

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

◆ pq_putmessage_v2()

int pq_putmessage_v2 ( char  msgtype,
const char *  s,
size_t  len 
)

Definition at line 1528 of file pqcomm.c.

1529 {
1530  Assert(msgtype != 0);
1531 
1532  if (PqCommBusy)
1533  return 0;
1534  PqCommBusy = true;
1535  if (internal_putbytes(&msgtype, 1))
1536  goto fail;
1537 
1538  if (internal_putbytes(s, len))
1539  goto fail;
1540  PqCommBusy = false;
1541  return 0;
1542 
1543 fail:
1544  PqCommBusy = false;
1545  return EOF;
1546 }
static int internal_putbytes(const char *s, size_t len)
Definition: pqcomm.c:1276

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

Referenced by send_message_to_frontend().

◆ pq_recvbuf()

static int pq_recvbuf ( void  )
static

Definition at line 909 of file pqcomm.c.

910 {
911  if (PqRecvPointer > 0)
912  {
914  {
915  /* still some unread data, left-justify it in the buffer */
919  PqRecvPointer = 0;
920  }
921  else
923  }
924 
925  /* Ensure that we're in blocking mode */
926  socket_set_nonblocking(false);
927 
928  /* Can fill buffer from PqRecvLength and upwards */
929  for (;;)
930  {
931  int r;
932 
935 
936  if (r < 0)
937  {
938  if (errno == EINTR)
939  continue; /* Ok if interrupted */
940 
941  /*
942  * Careful: an ereport() that tries to write to the client would
943  * cause recursion to here, leading to stack overflow and core
944  * dump! This message must go *only* to the postmaster log.
945  */
948  errmsg("could not receive data from client: %m")));
949  return EOF;
950  }
951  if (r == 0)
952  {
953  /*
954  * EOF detected. We used to write a log message here, but it's
955  * better to expect the ultimate caller to do that.
956  */
957  return EOF;
958  }
959  /* r contains number of bytes read, so just incr length */
960  PqRecvLength += r;
961  return 0;
962  }
963 }
#define PQ_RECV_BUFFER_SIZE
Definition: pqcomm.c:120

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

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

◆ pq_setkeepalivescount()

int pq_setkeepalivescount ( int  count,
Port port 
)

Definition at line 1798 of file pqcomm.c.

1799 {
1800  if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1801  return STATUS_OK;
1802 
1803 #ifdef TCP_KEEPCNT
1804  if (count == port->keepalives_count)
1805  return STATUS_OK;
1806 
1807  if (port->default_keepalives_count <= 0)
1808  {
1809  if (pq_getkeepalivescount(port) < 0)
1810  {
1811  if (count == 0)
1812  return STATUS_OK; /* default is set but unknown */
1813  else
1814  return STATUS_ERROR;
1815  }
1816  }
1817 
1818  if (count == 0)
1819  count = port->default_keepalives_count;
1820 
1821  if (setsockopt(port->sock, IPPROTO_TCP, TCP_KEEPCNT,
1822  (char *) &count, sizeof(count)) < 0)
1823  {
1824  ereport(LOG,
1825  (errmsg("%s(%s) failed: %m", "setsockopt", "TCP_KEEPCNT")));
1826  return STATUS_ERROR;
1827  }
1828 
1829  port->keepalives_count = count;
1830 #else
1831  if (count != 0)
1832  {
1833  ereport(LOG,
1834  (errmsg("%s(%s) not supported", "setsockopt", "TCP_KEEPCNT")));
1835  return STATUS_ERROR;
1836  }
1837 #endif
1838 
1839  return STATUS_OK;
1840 }
#define STATUS_ERROR
Definition: c.h:1109
int pq_getkeepalivescount(Port *port)
Definition: pqcomm.c:1768

References ereport, errmsg(), LOG, port, pq_getkeepalivescount(), STATUS_ERROR, and STATUS_OK.

Referenced by assign_tcp_keepalives_count(), and StreamConnection().

◆ pq_setkeepalivesidle()

int pq_setkeepalivesidle ( int  idle,
Port port 
)

Definition at line 1634 of file pqcomm.c.

1635 {
1636  if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1637  return STATUS_OK;
1638 
1639 /* check SIO_KEEPALIVE_VALS here, not just WIN32, as some toolchains lack it */
1640 #if defined(PG_TCP_KEEPALIVE_IDLE) || defined(SIO_KEEPALIVE_VALS)
1641  if (idle == port->keepalives_idle)
1642  return STATUS_OK;
1643 
1644 #ifndef WIN32
1645  if (port->default_keepalives_idle <= 0)
1646  {
1647  if (pq_getkeepalivesidle(port) < 0)
1648  {
1649  if (idle == 0)
1650  return STATUS_OK; /* default is set but unknown */
1651  else
1652  return STATUS_ERROR;
1653  }
1654  }
1655 
1656  if (idle == 0)
1657  idle = port->default_keepalives_idle;
1658 
1659  if (setsockopt(port->sock, IPPROTO_TCP, PG_TCP_KEEPALIVE_IDLE,
1660  (char *) &idle, sizeof(idle)) < 0)
1661  {
1662  ereport(LOG,
1663  (errmsg("%s(%s) failed: %m", "setsockopt", PG_TCP_KEEPALIVE_IDLE_STR)));
1664  return STATUS_ERROR;
1665  }
1666 
1667  port->keepalives_idle = idle;
1668 #else /* WIN32 */
1669  return pq_setkeepaliveswin32(port, idle, port->keepalives_interval);
1670 #endif
1671 #else
1672  if (idle != 0)
1673  {
1674  ereport(LOG,
1675  (errmsg("setting the keepalive idle time is not supported")));
1676  return STATUS_ERROR;
1677  }
1678 #endif
1679 
1680  return STATUS_OK;
1681 }
int pq_getkeepalivesidle(Port *port)
Definition: pqcomm.c:1599

References ereport, errmsg(), LOG, port, pq_getkeepalivesidle(), STATUS_ERROR, and STATUS_OK.

Referenced by assign_tcp_keepalives_idle(), and StreamConnection().

◆ pq_setkeepalivesinterval()

int pq_setkeepalivesinterval ( int  interval,
Port port 
)

Definition at line 1719 of file pqcomm.c.

1720 {
1721  if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1722  return STATUS_OK;
1723 
1724 #if defined(TCP_KEEPINTVL) || defined(SIO_KEEPALIVE_VALS)
1725  if (interval == port->keepalives_interval)
1726  return STATUS_OK;
1727 
1728 #ifndef WIN32
1729  if (port->default_keepalives_interval <= 0)
1730  {
1731  if (pq_getkeepalivesinterval(port) < 0)
1732  {
1733  if (interval == 0)
1734  return STATUS_OK; /* default is set but unknown */
1735  else
1736  return STATUS_ERROR;
1737  }
1738  }
1739 
1740  if (interval == 0)
1741  interval = port->default_keepalives_interval;
1742 
1743  if (setsockopt(port->sock, IPPROTO_TCP, TCP_KEEPINTVL,
1744  (char *) &interval, sizeof(interval)) < 0)
1745  {
1746  ereport(LOG,
1747  (errmsg("%s(%s) failed: %m", "setsockopt", "TCP_KEEPINTVL")));
1748  return STATUS_ERROR;
1749  }
1750 
1751  port->keepalives_interval = interval;
1752 #else /* WIN32 */
1753  return pq_setkeepaliveswin32(port, port->keepalives_idle, interval);
1754 #endif
1755 #else
1756  if (interval != 0)
1757  {
1758  ereport(LOG,
1759  (errmsg("%s(%s) not supported", "setsockopt", "TCP_KEEPINTVL")));
1760  return STATUS_ERROR;
1761  }
1762 #endif
1763 
1764  return STATUS_OK;
1765 }
int pq_getkeepalivesinterval(Port *port)
Definition: pqcomm.c:1684

References ereport, errmsg(), LOG, port, pq_getkeepalivesinterval(), STATUS_ERROR, and STATUS_OK.

Referenced by assign_tcp_keepalives_interval(), and StreamConnection().

◆ pq_settcpusertimeout()

int pq_settcpusertimeout ( int  timeout,
Port port 
)

Definition at line 1873 of file pqcomm.c.

1874 {
1875  if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1876  return STATUS_OK;
1877 
1878 #ifdef TCP_USER_TIMEOUT
1879  if (timeout == port->tcp_user_timeout)
1880  return STATUS_OK;
1881 
1882  if (port->default_tcp_user_timeout <= 0)
1883  {
1884  if (pq_gettcpusertimeout(port) < 0)
1885  {
1886  if (timeout == 0)
1887  return STATUS_OK; /* default is set but unknown */
1888  else
1889  return STATUS_ERROR;
1890  }
1891  }
1892 
1893  if (timeout == 0)
1894  timeout = port->default_tcp_user_timeout;
1895 
1896  if (setsockopt(port->sock, IPPROTO_TCP, TCP_USER_TIMEOUT,
1897  (char *) &timeout, sizeof(timeout)) < 0)
1898  {
1899  ereport(LOG,
1900  (errmsg("%s(%s) failed: %m", "setsockopt", "TCP_USER_TIMEOUT")));
1901  return STATUS_ERROR;
1902  }
1903 
1904  port->tcp_user_timeout = timeout;
1905 #else
1906  if (timeout != 0)
1907  {
1908  ereport(LOG,
1909  (errmsg("%s(%s) not supported", "setsockopt", "TCP_USER_TIMEOUT")));
1910  return STATUS_ERROR;
1911  }
1912 #endif
1913 
1914  return STATUS_OK;
1915 }
int pq_gettcpusertimeout(Port *port)
Definition: pqcomm.c:1843

References ereport, errmsg(), LOG, port, pq_gettcpusertimeout(), STATUS_ERROR, and STATUS_OK.

Referenced by assign_tcp_user_timeout(), and StreamConnection().

◆ pq_startmsgread()

void pq_startmsgread ( void  )

Definition at line 1140 of file pqcomm.c.

1141 {
1142  /*
1143  * There shouldn't be a read active already, but let's check just to be
1144  * sure.
1145  */
1146  if (PqCommReadingMsg)
1147  ereport(FATAL,
1148  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1149  errmsg("terminating connection because protocol synchronization was lost")));
1150 
1151  PqCommReadingMsg = true;
1152 }
#define FATAL
Definition: elog.h:37

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

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

◆ RemoveSocketFiles()

void RemoveSocketFiles ( void  )

Definition at line 859 of file pqcomm.c.

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  /* Ignore any error. */
869  (void) unlink(sock_path);
870  }
871  /* Since we're about to exit, no need to reclaim storage */
872  sock_paths = NIL;
873 }
#define lfirst(lc)
Definition: pg_list.h:170
#define NIL
Definition: pg_list.h:66

References lfirst, NIL, and sock_paths.

Referenced by CloseServerPorts().

◆ Setup_AF_UNIX()

static int Setup_AF_UNIX ( const char *  sock_path)
static

Definition at line 618 of file pqcomm.c.

619 {
620  /* no file system permissions for abstract sockets */
621  if (sock_path[0] == '@')
622  return STATUS_OK;
623 
624  /*
625  * Fix socket ownership/permission if requested. Note we must do this
626  * before we listen() to avoid a window where unwanted connections could
627  * get accepted.
628  */
630  if (Unix_socket_group[0] != '\0')
631  {
632 #ifdef WIN32
633  elog(WARNING, "configuration item unix_socket_group is not supported on this platform");
634 #else
635  char *endptr;
636  unsigned long val;
637  gid_t gid;
638 
639  val = strtoul(Unix_socket_group, &endptr, 10);
640  if (*endptr == '\0')
641  { /* numeric group id */
642  gid = val;
643  }
644  else
645  { /* convert group name to id */
646  struct group *gr;
647 
648  gr = getgrnam(Unix_socket_group);
649  if (!gr)
650  {
651  ereport(LOG,
652  (errmsg("group \"%s\" does not exist",
654  return STATUS_ERROR;
655  }
656  gid = gr->gr_gid;
657  }
658  if (chown(sock_path, -1, gid) == -1)
659  {
660  ereport(LOG,
662  errmsg("could not set group of file \"%s\": %m",
663  sock_path)));
664  return STATUS_ERROR;
665  }
666 #endif
667  }
668 
669  if (chmod(sock_path, Unix_socket_permissions) == -1)
670  {
671  ereport(LOG,
673  errmsg("could not set permissions of file \"%s\": %m",
674  sock_path)));
675  return STATUS_ERROR;
676  }
677  return STATUS_OK;
678 }
int errcode_for_file_access(void)
Definition: elog.c:758
#define WARNING
Definition: elog.h:32
long val
Definition: informix.c:664
int Unix_socket_permissions
Definition: pqcomm.c:106
char * Unix_socket_group
Definition: pqcomm.c:107
int gid_t
Definition: win32_port.h:247

References Assert(), elog(), ereport, errcode_for_file_access(), errmsg(), LOG, STATUS_ERROR, STATUS_OK, Unix_socket_group, Unix_socket_permissions, val, and WARNING.

Referenced by StreamServerPort().

◆ show_tcp_keepalives_count()

const char* show_tcp_keepalives_count ( void  )

Definition at line 1987 of file pqcomm.c.

1988 {
1989  /* See comments in assign_tcp_keepalives_idle */
1990  static char nbuf[16];
1991 
1992  snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivescount(MyProcPort));
1993  return nbuf;
1994 }
#define snprintf
Definition: port.h:238

References MyProcPort, pq_getkeepalivescount(), and snprintf.

◆ show_tcp_keepalives_idle()

const char* show_tcp_keepalives_idle ( void  )

Definition at line 1941 of file pqcomm.c.

1942 {
1943  /* See comments in assign_tcp_keepalives_idle */
1944  static char nbuf[16];
1945 
1946  snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivesidle(MyProcPort));
1947  return nbuf;
1948 }

References MyProcPort, pq_getkeepalivesidle(), and snprintf.

◆ show_tcp_keepalives_interval()

const char* show_tcp_keepalives_interval ( void  )

Definition at line 1964 of file pqcomm.c.

1965 {
1966  /* See comments in assign_tcp_keepalives_idle */
1967  static char nbuf[16];
1968 
1969  snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivesinterval(MyProcPort));
1970  return nbuf;
1971 }

References MyProcPort, pq_getkeepalivesinterval(), and snprintf.

◆ show_tcp_user_timeout()

const char* show_tcp_user_timeout ( void  )

Definition at line 2010 of file pqcomm.c.

2011 {
2012  /* See comments in assign_tcp_keepalives_idle */
2013  static char nbuf[16];
2014 
2015  snprintf(nbuf, sizeof(nbuf), "%d", pq_gettcpusertimeout(MyProcPort));
2016  return nbuf;
2017 }

References MyProcPort, pq_gettcpusertimeout(), and snprintf.

◆ socket_close()

static void socket_close ( int  code,
Datum  arg 
)
static

Definition at line 243 of file pqcomm.c.

244 {
245  /* Nothing to do in a standalone backend, where MyProcPort is NULL. */
246  if (MyProcPort != NULL)
247  {
248 #ifdef ENABLE_GSS
249  /*
250  * Shutdown GSSAPI layer. This section does nothing when interrupting
251  * BackendInitialize(), because pg_GSS_recvauth() makes first use of
252  * "ctx" and "cred".
253  *
254  * Note that we don't bother to free MyProcPort->gss, since we're
255  * about to exit anyway.
256  */
257  if (MyProcPort->gss)
258  {
259  OM_uint32 min_s;
260 
261  if (MyProcPort->gss->ctx != GSS_C_NO_CONTEXT)
262  gss_delete_sec_context(&min_s, &MyProcPort->gss->ctx, NULL);
263 
264  if (MyProcPort->gss->cred != GSS_C_NO_CREDENTIAL)
265  gss_release_cred(&min_s, &MyProcPort->gss->cred);
266  }
267 #endif /* ENABLE_GSS */
268 
269  /*
270  * Cleanly shut down SSL layer. Nowhere else does a postmaster child
271  * call this, so this is safe when interrupting BackendInitialize().
272  */
274 
275  /*
276  * Formerly we did an explicit close() here, but it seems better to
277  * leave the socket open until the process dies. This allows clients
278  * to perform a "synchronous close" if they care --- wait till the
279  * transport layer reports connection closure, and you can be sure the
280  * backend has exited.
281  *
282  * We do set sock to PGINVALID_SOCKET to prevent any further I/O,
283  * though.
284  */
286  }
287 }
void secure_close(Port *port)
Definition: be-secure.c:133
void * gss
Definition: libpq-be.h:210

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

Referenced by pq_init().

◆ socket_comm_reset()

static void socket_comm_reset ( void  )
static

Definition at line 228 of file pqcomm.c.

229 {
230  /* Do not throw away pending data, but do reset the busy flag */
231  PqCommBusy = false;
232 }

References PqCommBusy.

◆ socket_flush()

static int socket_flush ( void  )
static

Definition at line 1307 of file pqcomm.c.

1308 {
1309  int res;
1310 
1311  /* No-op if reentrant call */
1312  if (PqCommBusy)
1313  return 0;
1314  PqCommBusy = true;
1315  socket_set_nonblocking(false);
1316  res = internal_flush();
1317  PqCommBusy = false;
1318  return res;
1319 }

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

◆ socket_flush_if_writable()

static int socket_flush_if_writable ( void  )
static

Definition at line 1402 of file pqcomm.c.

1403 {
1404  int res;
1405 
1406  /* Quick exit if nothing to do */
1407  if (PqSendPointer == PqSendStart)
1408  return 0;
1409 
1410  /* No-op if reentrant call */
1411  if (PqCommBusy)
1412  return 0;
1413 
1414  /* Temporarily put the socket into non-blocking mode */
1415  socket_set_nonblocking(true);
1416 
1417  PqCommBusy = true;
1418  res = internal_flush();
1419  PqCommBusy = false;
1420  return res;
1421 }

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

◆ socket_is_send_pending()

static bool socket_is_send_pending ( void  )
static

Definition at line 1428 of file pqcomm.c.

1429 {
1430  return (PqSendStart < PqSendPointer);
1431 }

References PqSendPointer, and PqSendStart.

◆ socket_putmessage()

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

Definition at line 1458 of file pqcomm.c.

1459 {
1460  uint32 n32;
1461 
1462  Assert(msgtype != 0);
1463 
1464  if (PqCommBusy)
1465  return 0;
1466  PqCommBusy = true;
1467  if (internal_putbytes(&msgtype, 1))
1468  goto fail;
1469 
1470  n32 = pg_hton32((uint32) (len + 4));
1471  if (internal_putbytes((char *) &n32, 4))
1472  goto fail;
1473 
1474  if (internal_putbytes(s, len))
1475  goto fail;
1476  PqCommBusy = false;
1477  return 0;
1478 
1479 fail:
1480  PqCommBusy = false;
1481  return EOF;
1482 }
unsigned int uint32
Definition: c.h:442
#define pg_hton32(x)
Definition: pg_bswap.h:121

References Assert(), internal_putbytes(), len, pg_hton32, and PqCommBusy.

◆ socket_putmessage_noblock()

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

Definition at line 1491 of file pqcomm.c.

1492 {
1494  int required;
1495 
1496  /*
1497  * Ensure we have enough space in the output buffer for the message header
1498  * as well as the message itself.
1499  */
1500  required = PqSendPointer + 1 + 4 + len;
1501  if (required > PqSendBufferSize)
1502  {
1505  }
1506  res = pq_putmessage(msgtype, s, len);
1507  Assert(res == 0); /* should not fail when the message fits in
1508  * buffer */
1509 }
#define pq_putmessage(msgtype, s, len)
Definition: libpq.h:49
void * repalloc(void *pointer, Size size)
Definition: mcxt.c:1321

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

◆ socket_set_nonblocking()

static void socket_set_nonblocking ( bool  nonblocking)
static

Definition at line 892 of file pqcomm.c.

893 {
894  if (MyProcPort == NULL)
895  ereport(ERROR,
896  (errcode(ERRCODE_CONNECTION_DOES_NOT_EXIST),
897  errmsg("there is no client connection")));
898 
899  MyProcPort->noblock = nonblocking;
900 }
#define ERROR
Definition: elog.h:35
bool noblock
Definition: libpq-be.h:148

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().

◆ StreamClose()

void StreamClose ( pgsocket  sock)

Definition at line 826 of file pqcomm.c.

827 {
828  closesocket(sock);
829 }
#define closesocket
Definition: port.h:349

References closesocket.

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

◆ StreamConnection()

int StreamConnection ( pgsocket  server_fd,
Port port 
)

Definition at line 692 of file pqcomm.c.

693 {
694  /* accept connection and fill in the client (remote) address */
695  port->raddr.salen = sizeof(port->raddr.addr);
696  if ((port->sock = accept(server_fd,
697  (struct sockaddr *) &port->raddr.addr,
698  &port->raddr.salen)) == PGINVALID_SOCKET)
699  {
700  ereport(LOG,
702  errmsg("could not accept new connection: %m")));
703 
704  /*
705  * If accept() fails then postmaster.c will still see the server
706  * socket as read-ready, and will immediately try again. To avoid
707  * uselessly sucking lots of CPU, delay a bit before trying again.
708  * (The most likely reason for failure is being out of kernel file
709  * table slots; we can do little except hope some will get freed up.)
710  */
711  pg_usleep(100000L); /* wait 0.1 sec */
712  return STATUS_ERROR;
713  }
714 
715  /* fill in the server (local) address */
716  port->laddr.salen = sizeof(port->laddr.addr);
717  if (getsockname(port->sock,
718  (struct sockaddr *) &port->laddr.addr,
719  &port->laddr.salen) < 0)
720  {
721  ereport(LOG,
722  (errmsg("%s() failed: %m", "getsockname")));
723  return STATUS_ERROR;
724  }
725 
726  /* select NODELAY and KEEPALIVE options if it's a TCP connection */
727  if (port->laddr.addr.ss_family != AF_UNIX)
728  {
729  int on;
730 #ifdef WIN32
731  int oldopt;
732  int optlen;
733  int newopt;
734 #endif
735 
736 #ifdef TCP_NODELAY
737  on = 1;
738  if (setsockopt(port->sock, IPPROTO_TCP, TCP_NODELAY,
739  (char *) &on, sizeof(on)) < 0)
740  {
741  ereport(LOG,
742  (errmsg("%s(%s) failed: %m", "setsockopt", "TCP_NODELAY")));
743  return STATUS_ERROR;
744  }
745 #endif
746  on = 1;
747  if (setsockopt(port->sock, SOL_SOCKET, SO_KEEPALIVE,
748  (char *) &on, sizeof(on)) < 0)
749  {
750  ereport(LOG,
751  (errmsg("%s(%s) failed: %m", "setsockopt", "SO_KEEPALIVE")));
752  return STATUS_ERROR;
753  }
754 
755 #ifdef WIN32
756 
757  /*
758  * This is a Win32 socket optimization. The OS send buffer should be
759  * large enough to send the whole Postgres send buffer in one go, or
760  * performance suffers. The Postgres send buffer can be enlarged if a
761  * very large message needs to be sent, but we won't attempt to
762  * enlarge the OS buffer if that happens, so somewhat arbitrarily
763  * ensure that the OS buffer is at least PQ_SEND_BUFFER_SIZE * 4.
764  * (That's 32kB with the current default).
765  *
766  * The default OS buffer size used to be 8kB in earlier Windows
767  * versions, but was raised to 64kB in Windows 2012. So it shouldn't
768  * be necessary to change it in later versions anymore. Changing it
769  * unnecessarily can even reduce performance, because setting
770  * SO_SNDBUF in the application disables the "dynamic send buffering"
771  * feature that was introduced in Windows 7. So before fiddling with
772  * SO_SNDBUF, check if the current buffer size is already large enough
773  * and only increase it if necessary.
774  *
775  * See https://support.microsoft.com/kb/823764/EN-US/ and
776  * https://msdn.microsoft.com/en-us/library/bb736549%28v=vs.85%29.aspx
777  */
778  optlen = sizeof(oldopt);
779  if (getsockopt(port->sock, SOL_SOCKET, SO_SNDBUF, (char *) &oldopt,
780  &optlen) < 0)
781  {
782  ereport(LOG,
783  (errmsg("%s(%s) failed: %m", "getsockopt", "SO_SNDBUF")));
784  return STATUS_ERROR;
785  }
786  newopt = PQ_SEND_BUFFER_SIZE * 4;
787  if (oldopt < newopt)
788  {
789  if (setsockopt(port->sock, SOL_SOCKET, SO_SNDBUF, (char *) &newopt,
790  sizeof(newopt)) < 0)
791  {
792  ereport(LOG,
793  (errmsg("%s(%s) failed: %m", "setsockopt", "SO_SNDBUF")));
794  return STATUS_ERROR;
795  }
796  }
797 #endif
798 
799  /*
800  * Also apply the current keepalive parameters. If we fail to set a
801  * parameter, don't error out, because these aren't universally
802  * supported. (Note: you might think we need to reset the GUC
803  * variables to 0 in such a case, but it's not necessary because the
804  * show hooks for these variables report the truth anyway.)
805  */
810  }
811 
812  return STATUS_OK;
813 }
int tcp_keepalives_idle
Definition: guc_tables.c:512
int tcp_keepalives_interval
Definition: guc_tables.c:513
int tcp_keepalives_count
Definition: guc_tables.c:514
int tcp_user_timeout
Definition: guc_tables.c:515
void pg_usleep(long microsec)
Definition: signal.c:53
#define accept(s, addr, addrlen)
Definition: win32_port.h:490

References accept, ereport, errcode_for_socket_access(), errmsg(), LOG, pg_usleep(), PGINVALID_SOCKET, port, PQ_SEND_BUFFER_SIZE, pq_setkeepalivescount(), pq_setkeepalivesidle(), pq_setkeepalivesinterval(), pq_settcpusertimeout(), STATUS_ERROR, STATUS_OK, tcp_keepalives_count, tcp_keepalives_idle, tcp_keepalives_interval, and tcp_user_timeout.

Referenced by ConnCreate().

◆ StreamServerPort()

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

Definition at line 314 of file pqcomm.c.

317 {
318  pgsocket fd;
319  int err;
320  int maxconn;
321  int ret;
322  char portNumberStr[32];
323  const char *familyDesc;
324  char familyDescBuf[64];
325  const char *addrDesc;
326  char addrBuf[NI_MAXHOST];
327  char *service;
328  struct addrinfo *addrs = NULL,
329  *addr;
330  struct addrinfo hint;
331  int listen_index = 0;
332  int added = 0;
333  char unixSocketPath[MAXPGPATH];
334 #if !defined(WIN32) || defined(IPV6_V6ONLY)
335  int one = 1;
336 #endif
337 
338  /* Initialize hint structure */
339  MemSet(&hint, 0, sizeof(hint));
340  hint.ai_family = family;
341  hint.ai_flags = AI_PASSIVE;
342  hint.ai_socktype = SOCK_STREAM;
343 
344  if (family == AF_UNIX)
345  {
346  /*
347  * Create unixSocketPath from portNumber and unixSocketDir and lock
348  * that file path
349  */
350  UNIXSOCK_PATH(unixSocketPath, portNumber, unixSocketDir);
351  if (strlen(unixSocketPath) >= UNIXSOCK_PATH_BUFLEN)
352  {
353  ereport(LOG,
354  (errmsg("Unix-domain socket path \"%s\" is too long (maximum %d bytes)",
355  unixSocketPath,
356  (int) (UNIXSOCK_PATH_BUFLEN - 1))));
357  return STATUS_ERROR;
358  }
359  if (Lock_AF_UNIX(unixSocketDir, unixSocketPath) != STATUS_OK)
360  return STATUS_ERROR;
361  service = unixSocketPath;
362  }
363  else
364  {
365  snprintf(portNumberStr, sizeof(portNumberStr), "%d", portNumber);
366  service = portNumberStr;
367  }
368 
369  ret = pg_getaddrinfo_all(hostName, service, &hint, &addrs);
370  if (ret || !addrs)
371  {
372  if (hostName)
373  ereport(LOG,
374  (errmsg("could not translate host name \"%s\", service \"%s\" to address: %s",
375  hostName, service, gai_strerror(ret))));
376  else
377  ereport(LOG,
378  (errmsg("could not translate service \"%s\" to address: %s",
379  service, gai_strerror(ret))));
380  if (addrs)
381  pg_freeaddrinfo_all(hint.ai_family, addrs);
382  return STATUS_ERROR;
383  }
384 
385  for (addr = addrs; addr; addr = addr->ai_next)
386  {
387  if (family != AF_UNIX && addr->ai_family == AF_UNIX)
388  {
389  /*
390  * Only set up a unix domain socket when they really asked for it.
391  * The service/port is different in that case.
392  */
393  continue;
394  }
395 
396  /* See if there is still room to add 1 more socket. */
397  for (; listen_index < MaxListen; listen_index++)
398  {
399  if (ListenSocket[listen_index] == PGINVALID_SOCKET)
400  break;
401  }
402  if (listen_index >= MaxListen)
403  {
404  ereport(LOG,
405  (errmsg("could not bind to all requested addresses: MAXLISTEN (%d) exceeded",
406  MaxListen)));
407  break;
408  }
409 
410  /* set up address family name for log messages */
411  switch (addr->ai_family)
412  {
413  case AF_INET:
414  familyDesc = _("IPv4");
415  break;
416  case AF_INET6:
417  familyDesc = _("IPv6");
418  break;
419  case AF_UNIX:
420  familyDesc = _("Unix");
421  break;
422  default:
423  snprintf(familyDescBuf, sizeof(familyDescBuf),
424  _("unrecognized address family %d"),
425  addr->ai_family);
426  familyDesc = familyDescBuf;
427  break;
428  }
429 
430  /* set up text form of address for log messages */
431  if (addr->ai_family == AF_UNIX)
432  addrDesc = unixSocketPath;
433  else
434  {
435  pg_getnameinfo_all((const struct sockaddr_storage *) addr->ai_addr,
436  addr->ai_addrlen,
437  addrBuf, sizeof(addrBuf),
438  NULL, 0,
439  NI_NUMERICHOST);
440  addrDesc = addrBuf;
441  }
442 
443  if ((fd = socket(addr->ai_family, SOCK_STREAM, 0)) == PGINVALID_SOCKET)
444  {
445  ereport(LOG,
447  /* translator: first %s is IPv4, IPv6, or Unix */
448  errmsg("could not create %s socket for address \"%s\": %m",
449  familyDesc, addrDesc)));
450  continue;
451  }
452 
453 #ifndef WIN32
454 
455  /*
456  * Without the SO_REUSEADDR flag, a new postmaster can't be started
457  * right away after a stop or crash, giving "address already in use"
458  * error on TCP ports.
459  *
460  * On win32, however, this behavior only happens if the
461  * SO_EXCLUSIVEADDRUSE is set. With SO_REUSEADDR, win32 allows
462  * multiple servers to listen on the same address, resulting in
463  * unpredictable behavior. With no flags at all, win32 behaves as Unix
464  * with SO_REUSEADDR.
465  */
466  if (addr->ai_family != AF_UNIX)
467  {
468  if ((setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
469  (char *) &one, sizeof(one))) == -1)
470  {
471  ereport(LOG,
473  /* translator: third %s is IPv4, IPv6, or Unix */
474  errmsg("%s(%s) failed for %s address \"%s\": %m",
475  "setsockopt", "SO_REUSEADDR",
476  familyDesc, addrDesc)));
477  closesocket(fd);
478  continue;
479  }
480  }
481 #endif
482 
483 #ifdef IPV6_V6ONLY
484  if (addr->ai_family == AF_INET6)
485  {
486  if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY,
487  (char *) &one, sizeof(one)) == -1)
488  {
489  ereport(LOG,
491  /* translator: third %s is IPv4, IPv6, or Unix */
492  errmsg("%s(%s) failed for %s address \"%s\": %m",
493  "setsockopt", "IPV6_V6ONLY",
494  familyDesc, addrDesc)));
495  closesocket(fd);
496  continue;
497  }
498  }
499 #endif
500 
501  /*
502  * Note: This might fail on some OS's, like Linux older than
503  * 2.4.21-pre3, that don't have the IPV6_V6ONLY socket option, and map
504  * ipv4 addresses to ipv6. It will show ::ffff:ipv4 for all ipv4
505  * connections.
506  */
507  err = bind(fd, addr->ai_addr, addr->ai_addrlen);
508  if (err < 0)
509  {
510  int saved_errno = errno;
511 
512  ereport(LOG,
514  /* translator: first %s is IPv4, IPv6, or Unix */
515  errmsg("could not bind %s address \"%s\": %m",
516  familyDesc, addrDesc),
517  saved_errno == EADDRINUSE ?
518  (addr->ai_family == AF_UNIX ?
519  errhint("Is another postmaster already running on port %d?",
520  (int) portNumber) :
521  errhint("Is another postmaster already running on port %d?"
522  " If not, wait a few seconds and retry.",
523  (int) portNumber)) : 0));
524  closesocket(fd);
525  continue;
526  }
527 
528  if (addr->ai_family == AF_UNIX)
529  {
530  if (Setup_AF_UNIX(service) != STATUS_OK)
531  {
532  closesocket(fd);
533  break;
534  }
535  }
536 
537  /*
538  * Select appropriate accept-queue length limit. It seems reasonable
539  * to use a value similar to the maximum number of child processes
540  * that the postmaster will permit.
541  */
542  maxconn = MaxConnections * 2;
543 
544  err = listen(fd, maxconn);
545  if (err < 0)
546  {
547  ereport(LOG,
549  /* translator: first %s is IPv4, IPv6, or Unix */
550  errmsg("could not listen on %s address \"%s\": %m",
551  familyDesc, addrDesc)));
552  closesocket(fd);
553  continue;
554  }
555 
556  if (addr->ai_family == AF_UNIX)
557  ereport(LOG,
558  (errmsg("listening on Unix socket \"%s\"",
559  addrDesc)));
560  else
561  ereport(LOG,
562  /* translator: first %s is IPv4 or IPv6 */
563  (errmsg("listening on %s address \"%s\", port %d",
564  familyDesc, addrDesc, (int) portNumber)));
565 
566  ListenSocket[listen_index] = fd;
567  added++;
568  }
569 
570  pg_freeaddrinfo_all(hint.ai_family, addrs);
571 
572  if (!added)
573  return STATUS_ERROR;
574 
575  return STATUS_OK;
576 }
#define MemSet(start, val, len)
Definition: c.h:953
int errhint(const char *fmt,...)
Definition: elog.c:1193
#define _(x)
Definition: elog.c:90
int MaxConnections
Definition: globals.c:137
void pg_freeaddrinfo_all(int hint_ai_family, struct addrinfo *ai)
Definition: ip.c:82
int pg_getnameinfo_all(const struct sockaddr_storage *addr, int salen, char *node, int nodelen, char *service, int servicelen, int flags)
Definition: ip.c:114
int pg_getaddrinfo_all(const char *hostname, const char *servname, const struct addrinfo *hintp, struct addrinfo **result)
Definition: ip.c:53
#define MAXPGPATH
int pgsocket
Definition: port.h:29
static pgsocket ListenSocket[MAXLISTEN]
Definition: postmaster.c:220
static int Lock_AF_UNIX(const char *unixSocketDir, const char *unixSocketPath)
Definition: pqcomm.c:583
static int Setup_AF_UNIX(const char *sock_path)
Definition: pqcomm.c:618
#define UNIXSOCK_PATH(path, port, sockdir)
Definition: pqcomm.h:32
#define UNIXSOCK_PATH_BUFLEN
Definition: pqcomm.h:48
static int fd(const char *x, int i)
Definition: preproc-init.c:105
#define bind(s, addr, addrlen)
Definition: win32_port.h:488
#define EADDRINUSE
Definition: win32_port.h:395
#define socket(af, type, protocol)
Definition: win32_port.h:487
#define listen(s, backlog)
Definition: win32_port.h:489

References _, bind, closesocket, EADDRINUSE, ereport, errcode_for_socket_access(), errhint(), errmsg(), fd(), listen, ListenSocket, Lock_AF_UNIX(), LOG, MaxConnections, MAXPGPATH, MemSet, pg_freeaddrinfo_all(), pg_getaddrinfo_all(), pg_getnameinfo_all(), PGINVALID_SOCKET, Setup_AF_UNIX(), snprintf, socket, STATUS_ERROR, STATUS_OK, UNIXSOCK_PATH, and UNIXSOCK_PATH_BUFLEN.

Referenced by PostmasterMain().

◆ TouchSocketFiles()

void TouchSocketFiles ( void  )

Definition at line 841 of file pqcomm.c.

842 {
843  ListCell *l;
844 
845  /* Loop through all created sockets... */
846  foreach(l, sock_paths)
847  {
848  char *sock_path = (char *) lfirst(l);
849 
850  /* Ignore errors; there's no point in complaining */
851  (void) utime(sock_path, NULL);
852  }
853 }

References lfirst, and sock_paths.

Referenced by ServerLoop().

Variable Documentation

◆ FeBeWaitSet

◆ PqCommBusy

bool PqCommBusy
static

◆ PqCommMethods

const PQcommMethods* PqCommMethods = &PqCommSocketMethods

Definition at line 162 of file pqcomm.c.

Referenced by pq_redirect_to_shm_mq(), and pq_set_parallel_leader().

◆ PqCommReadingMsg

◆ PqCommSocketMethods

const PQcommMethods PqCommSocketMethods
static
Initial value:
= {
}
static int socket_flush_if_writable(void)
Definition: pqcomm.c:1402
static int socket_flush(void)
Definition: pqcomm.c:1307
static void socket_comm_reset(void)
Definition: pqcomm.c:228
static bool socket_is_send_pending(void)
Definition: pqcomm.c:1428
static int socket_putmessage(char msgtype, const char *s, size_t len)
Definition: pqcomm.c:1458
static void socket_putmessage_noblock(char msgtype, const char *s, size_t len)
Definition: pqcomm.c:1491

Definition at line 153 of file pqcomm.c.

◆ PqRecvBuffer

char PqRecvBuffer[PQ_RECV_BUFFER_SIZE]
static

Definition at line 127 of file pqcomm.c.

Referenced by pq_getbyte(), pq_getbyte_if_available(), pq_getbytes(), pq_peekbyte(), and pq_recvbuf().

◆ PqRecvLength

int PqRecvLength
static

◆ PqRecvPointer

int PqRecvPointer
static

◆ PqSendBuffer

char* PqSendBuffer
static

Definition at line 122 of file pqcomm.c.

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

◆ PqSendBufferSize

int PqSendBufferSize
static

Definition at line 123 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 110 of file pqcomm.c.

Referenced by Lock_AF_UNIX(), RemoveSocketFiles(), and TouchSocketFiles().

◆ Unix_socket_group

char* Unix_socket_group

Definition at line 107 of file pqcomm.c.

Referenced by Setup_AF_UNIX().

◆ Unix_socket_permissions

int Unix_socket_permissions

Definition at line 106 of file pqcomm.c.

Referenced by Setup_AF_UNIX(), and show_unix_socket_permissions().