greenplumn ic_common 源码
greenplumn ic_common 代码
文件路径：/src/backend/cdb/motion/ic_common.c
/*-------------------------------------------------------------------------
* ic_common.c
* Interconnect code shared between UDP, and TCP IPC Layers.
*
* Portions Copyright (c) 2005-2008, Greenplum
* Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
*
*
* IDENTIFICATION
* src/backend/cdb/motion/ic_common.c
*
* Reviewers: jzhang, tkordas
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "common/ip.h"
#include "nodes/execnodes.h" /* ExecSlice, SliceTable */
#include "miscadmin.h"
#include "libpq/libpq-be.h"
#include "utils/builtins.h"
#include "utils/memutils.h"
#include "cdb/ml_ipc.h"
#include "cdb/cdbvars.h"
#include "cdb/cdbdisp.h"
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <netinet/in.h>
/*
#define AMS_VERBOSE_LOGGING
*/
/*=========================================================================
* STRUCTS
*/
typedef struct interconnect_handle_t
{
ChunkTransportState *interconnect_context; /* Interconnect state */
ResourceOwner owner; /* owner of this handle */
struct interconnect_handle_t *next;
struct interconnect_handle_t *prev;
} interconnect_handle_t;
/*=========================================================================
* GLOBAL STATE VARIABLES
*/
/* Socket file descriptor for the listener. */
int TCP_listenerFd;
int UDP_listenerFd;
static interconnect_handle_t *open_interconnect_handles;
static bool interconnect_resowner_callback_registered;
/*=========================================================================
* FUNCTIONS PROTOTYPES
*/
static void interconnect_abort_callback(ResourceReleasePhase phase,
bool isCommit,
bool isTopLevel,
void *arg);
static void cleanup_interconnect_handle(interconnect_handle_t *h);
static interconnect_handle_t *allocate_interconnect_handle(void);
static void destroy_interconnect_handle(interconnect_handle_t *h);
static interconnect_handle_t *find_interconnect_handle(ChunkTransportState *icContext);
static void
logChunkParseDetails(MotionConn *conn, uint32 ic_instance_id)
{
struct icpkthdr *pkt;
Assert(conn != NULL);
Assert(conn->pBuff != NULL);
pkt = (struct icpkthdr *) conn->pBuff;
elog(LOG, "Interconnect parse details: pkt->len %d pkt->seq %d pkt->flags 0x%x conn->active %d conn->stopRequest %d pkt->icId %d my_icId %d",
pkt->len, pkt->seq, pkt->flags, conn->stillActive, conn->stopRequested, pkt->icId, ic_instance_id);
elog(LOG, "Interconnect parse details continued: peer: srcpid %d dstpid %d recvslice %d sendslice %d srccontent %d dstcontent %d",
pkt->srcPid, pkt->dstPid, pkt->recvSliceIndex, pkt->sendSliceIndex, pkt->srcContentId, pkt->dstContentId);
}
TupleChunkListItem
RecvTupleChunk(MotionConn *conn, ChunkTransportState *transportStates)
{
TupleChunkListItem tcItem;
TupleChunkListItem firstTcItem = NULL;
TupleChunkListItem lastTcItem = NULL;
uint32 tcSize;
int bytesProcessed = 0;
if (Gp_interconnect_type == INTERCONNECT_TYPE_TCP ||
Gp_interconnect_type == INTERCONNECT_TYPE_PROXY)
{
/* read the packet in from the network. */
readPacket(conn, transportStates);
/* go through and form us some TupleChunks. */
bytesProcessed = PACKET_HEADER_SIZE;
}
else
{
/* go through and form us some TupleChunks. */
bytesProcessed = sizeof(struct icpkthdr);
}
#ifdef AMS_VERBOSE_LOGGING
elog(DEBUG5, "recvtuple chunk recv bytes %d msgsize %d conn->pBuff %p conn->msgPos: %p",
conn->recvBytes, conn->msgSize, conn->pBuff, conn->msgPos);
#endif
while (bytesProcessed != conn->msgSize)
{
if (conn->msgSize - bytesProcessed < TUPLE_CHUNK_HEADER_SIZE)
{
logChunkParseDetails(conn, transportStates->sliceTable->ic_instance_id);
ereport(ERROR,
(errcode(ERRCODE_GP_INTERCONNECTION_ERROR),
errmsg("interconnect error parsing message: insufficient data received"),
errdetail("conn->msgSize %d bytesProcessed %d < chunk-header %d",
conn->msgSize, bytesProcessed, TUPLE_CHUNK_HEADER_SIZE)));
}
tcSize = TUPLE_CHUNK_HEADER_SIZE + (*(uint16 *) (conn->msgPos + bytesProcessed));
/* sanity check */
if (tcSize > Gp_max_packet_size)
{
/*
* see MPP-720: it is possible that our message got messed up by a
* cancellation ?
*/
ML_CHECK_FOR_INTERRUPTS(transportStates->teardownActive);
/*
* MPP-4010: add some extra debugging.
*/
if (lastTcItem != NULL)
elog(LOG, "Interconnect error parsing message: last item length %d inplace %p", lastTcItem->chunk_length, lastTcItem->inplace);
else
elog(LOG, "Interconnect error parsing message: no last item");
logChunkParseDetails(conn, transportStates->sliceTable->ic_instance_id);
ereport(ERROR,
(errcode(ERRCODE_GP_INTERCONNECTION_ERROR),
errmsg("interconnect error parsing message"),
errdetail("tcSize %d > max %d header %d processed %d/%d from %p",
tcSize, Gp_max_packet_size,
TUPLE_CHUNK_HEADER_SIZE, bytesProcessed,
conn->msgSize, conn->msgPos)));
}
/*
* we only check for interrupts here when we don't have a guaranteed
* full-message
*/
if (Gp_interconnect_type == INTERCONNECT_TYPE_TCP ||
Gp_interconnect_type == INTERCONNECT_TYPE_PROXY)
{
if (tcSize >= conn->msgSize)
{
/*
* see MPP-720: it is possible that our message got messed up
* by a cancellation ?
*/
ML_CHECK_FOR_INTERRUPTS(transportStates->teardownActive);
logChunkParseDetails(conn, transportStates->sliceTable->ic_instance_id);
ereport(ERROR,
(errcode(ERRCODE_GP_INTERCONNECTION_ERROR),
errmsg("interconnect error parsing message"),
errdetail("tcSize %d >= conn->msgSize %d",
tcSize, conn->msgSize)));
}
}
Assert(tcSize < conn->msgSize);
/*
* We store the data inplace, and handle any necessary copying later
* on
*/
tcItem = (TupleChunkListItem) palloc(sizeof(TupleChunkListItemData));
tcItem->p_next = NULL;
tcItem->chunk_length = tcSize;
tcItem->inplace = (char *) (conn->msgPos + bytesProcessed);
bytesProcessed += tcSize;
if (firstTcItem == NULL)
{
firstTcItem = tcItem;
lastTcItem = tcItem;
}
else
{
lastTcItem->p_next = tcItem;
lastTcItem = tcItem;
}
}
conn->recvBytes -= conn->msgSize;
if (conn->recvBytes != 0)
{
#ifdef AMS_VERBOSE_LOGGING
elog(DEBUG5, "residual message %d bytes", conn->recvBytes);
#endif
conn->msgPos += conn->msgSize;
}
conn->msgSize = 0;
return firstTcItem;
}
/*=========================================================================
* VISIBLE FUNCTIONS
*/
/* See ml_ipc.h */
void
InitMotionLayerIPC(void)
{
uint16 tcp_listener = 0;
uint16 udp_listener = 0;
/* activated = false; */
if (Gp_interconnect_type == INTERCONNECT_TYPE_TCP ||
Gp_interconnect_type == INTERCONNECT_TYPE_PROXY)
InitMotionTCP(&TCP_listenerFd, &tcp_listener);
else if (Gp_interconnect_type == INTERCONNECT_TYPE_UDPIFC)
InitMotionUDPIFC(&UDP_listenerFd, &udp_listener);
Gp_listener_port = (udp_listener << 16) | tcp_listener;
elog(DEBUG1, "Interconnect listening on tcp port %d udp port %d (0x%x)", tcp_listener, udp_listener, Gp_listener_port);
}
/* See ml_ipc.h */
void
CleanUpMotionLayerIPC(void)
{
if (gp_log_interconnect >= GPVARS_VERBOSITY_DEBUG)
elog(DEBUG3, "Cleaning Up Motion Layer IPC...");
if (Gp_interconnect_type == INTERCONNECT_TYPE_TCP ||
Gp_interconnect_type == INTERCONNECT_TYPE_PROXY)
CleanupMotionTCP();
else if (Gp_interconnect_type == INTERCONNECT_TYPE_UDPIFC)
CleanupMotionUDPIFC();
/* close down the Interconnect listener socket. */
if (TCP_listenerFd >= 0)
closesocket(TCP_listenerFd);
if (UDP_listenerFd >= 0)
closesocket(UDP_listenerFd);
/* be safe and reset global state variables. */
Gp_listener_port = 0;
TCP_listenerFd = -1;
UDP_listenerFd = -1;
}
/* See ml_ipc.h */
bool
SendTupleChunkToAMS(MotionLayerState *mlStates,
ChunkTransportState *transportStates,
int16 motNodeID,
int16 targetRoute,
TupleChunkListItem tcItem)
{
int i,
recount = 0;
ChunkTransportStateEntry *pEntry = NULL;
MotionConn *conn;
TupleChunkListItem currItem;
if (!transportStates)
elog(FATAL, "SendTupleChunkToAMS: no transport-states.");
if (!transportStates->activated)
elog(FATAL, "SendTupleChunkToAMS: transport states inactive");
/* check em' */
ML_CHECK_FOR_INTERRUPTS(transportStates->teardownActive);
#ifdef AMS_VERBOSE_LOGGING
elog(DEBUG3, "sendtuplechunktoams: calling get_transport_state"
"w/transportStates %p transportState->size %d motnodeid %d route %d",
transportStates, transportStates->size, motNodeID, targetRoute);
#endif
getChunkTransportState(transportStates, motNodeID, &pEntry);
/*
* tcItem can actually be a chain of tcItems. we need to send out all of
* them.
*/
currItem = tcItem;
for (currItem = tcItem; currItem != NULL; currItem = currItem->p_next)
{
#ifdef AMS_VERBOSE_LOGGING
elog(DEBUG5, "SendTupleChunkToAMS: chunk length %d", currItem->chunk_length);
#endif
if (targetRoute == BROADCAST_SEGIDX)
{
doBroadcast(transportStates, pEntry, currItem, &recount);
}
else
{
/* handle pt-to-pt message. Primary */
Assert(targetRoute >= 0);
Assert(targetRoute < pEntry->numConns);
conn = pEntry->conns + targetRoute;
/* only send to interested connections */
if (conn->stillActive)
{
transportStates->SendChunk(transportStates, pEntry, conn, currItem, motNodeID);
if (!conn->stillActive)
recount = 1;
}
/* in 4.0 logical mirror xmit eliminated. */
}
}
if (recount == 0)
return true;
/* if we don't have any connections active, return false */
for (i = 0; i < pEntry->numConns; i++)
{
conn = pEntry->conns + i;
if (conn->stillActive)
break;
}
/* if we found an active connection we're not done */
return (i < pEntry->numConns);
}
/*
* The fetches a direct pointer into our transmit buffers, along with
* an indication as to how much data can be safely shoved into the
* buffer (started at the pointed location).
*
* This works a lot like SendTupleChunkToAMS().
*/
void
getTransportDirectBuffer(ChunkTransportState *transportStates,
int16 motNodeID,
int16 targetRoute,
struct directTransportBuffer *b)
{
ChunkTransportStateEntry *pEntry = NULL;
MotionConn *conn;
if (!transportStates)
{
elog(FATAL, "getTransportDirectBuffer: no transport states");
}
else if (!transportStates->activated)
{
elog(FATAL, "getTransportDirectBuffer: inactive transport states");
}
else if (targetRoute == BROADCAST_SEGIDX)
{
elog(FATAL, "getTransportDirectBuffer: can't direct-transport to broadcast");
}
Assert(b != NULL);
do
{
getChunkTransportState(transportStates, motNodeID, &pEntry);
/* handle pt-to-pt message. Primary */
conn = pEntry->conns + targetRoute;
/* only send to interested connections */
if (!conn->stillActive)
{
break;
}
b->pri = conn->pBuff + conn->msgSize;
b->prilen = Gp_max_packet_size - conn->msgSize;
/* got buffer. */
return;
}
while (0);
/* buffer is missing ? */
b->pri = NULL;
b->prilen = 0;
return;
}
/*
* The fetches a direct pointer into our transmit buffers, along with
* an indication as to how much data can be safely shoved into the
* buffer (started at the pointed location).
*
* This works a lot like SendTupleChunkToAMS().
*/
void
putTransportDirectBuffer(ChunkTransportState *transportStates,
int16 motNodeID,
int16 targetRoute, int length)
{
ChunkTransportStateEntry *pEntry = NULL;
MotionConn *conn;
if (!transportStates)
{
elog(FATAL, "putTransportDirectBuffer: no transport states");
}
else if (!transportStates->activated)
{
elog(FATAL, "putTransportDirectBuffer: inactive transport states");
}
else if (targetRoute == BROADCAST_SEGIDX)
{
elog(FATAL, "putTransportDirectBuffer: can't direct-transport to broadcast");
}
getChunkTransportState(transportStates, motNodeID, &pEntry);
/* handle pt-to-pt message. Primary */
conn = pEntry->conns + targetRoute;
/* only send to interested connections */
if (conn->stillActive)
{
conn->msgSize += length;
conn->tupleCount++;
}
/* put buffer. */
return;
}
/*
* DeregisterReadInterest is called on receiving nodes when they
* believe that they're done with the receiver
*/
void
DeregisterReadInterest(ChunkTransportState *transportStates,
int motNodeID,
int srcRoute,
const char *reason)
{
ChunkTransportStateEntry *pEntry = NULL;
MotionConn *conn;
if (!transportStates)
{
elog(FATAL, "DeregisterReadInterest: no transport states");
}
if (!transportStates->activated)
return;
getChunkTransportState(transportStates, motNodeID, &pEntry);
conn = pEntry->conns + srcRoute;
if (gp_log_interconnect >= GPVARS_VERBOSITY_DEBUG)
{
elog(DEBUG3, "Interconnect finished receiving "
"from seg%d slice%d %s pid=%d sockfd=%d; %s",
conn->remoteContentId,
pEntry->sendSlice->sliceIndex,
conn->remoteHostAndPort,
conn->cdbProc->pid,
conn->sockfd,
reason);
}
if (Gp_interconnect_type == INTERCONNECT_TYPE_UDPIFC)
{
#ifdef AMS_VERBOSE_LOGGING
elog(LOG, "deregisterReadInterest set stillactive = false for node %d route %d (%s)", motNodeID, srcRoute, reason);
#endif
markUDPConnInactiveIFC(conn);
}
else
{
/*
* we also mark the connection as "done." The way synchronization
* works is strange. On QDs the "teardown" doesn't get called until
* all segments are finished, which means that we need some way for
* the QEs to know that Teardown should complete, otherwise we
* deadlock the entire query (QEs wait in their Teardown calls, while
* the QD waits for them to finish)
*/
shutdown(conn->sockfd, SHUT_WR);
MPP_FD_CLR(conn->sockfd, &pEntry->readSet);
}
return;
}
void
SetupInterconnect(EState *estate)
{
interconnect_handle_t *h;
MemoryContext oldContext;
if (estate->interconnect_context)
{
elog(ERROR, "SetupInterconnect: already initialized.");
}
else if (!estate->es_sliceTable)
{
elog(ERROR, "SetupInterconnect: no slice table ?");
}
h = allocate_interconnect_handle();
Assert(InterconnectContext != NULL);
oldContext = MemoryContextSwitchTo(InterconnectContext);
if (Gp_interconnect_type == INTERCONNECT_TYPE_UDPIFC)
SetupUDPIFCInterconnect(estate);
else if (Gp_interconnect_type == INTERCONNECT_TYPE_TCP ||
Gp_interconnect_type == INTERCONNECT_TYPE_PROXY)
SetupTCPInterconnect(estate);
else
elog(ERROR, "unsupported expected interconnect type");
MemoryContextSwitchTo(oldContext);
h->interconnect_context = estate->interconnect_context;
}
/* TeardownInterconnect() function is used to cleanup interconnect resources that
* were allocated during SetupInterconnect(). This function should ALWAYS be
* called after SetupInterconnect to avoid leaking resources (like sockets)
* even if SetupInterconnect did not complete correctly.
*/
void
TeardownInterconnect(ChunkTransportState *transportStates, bool hasErrors)
{
interconnect_handle_t *h = find_interconnect_handle(transportStates);
if (Gp_interconnect_type == INTERCONNECT_TYPE_UDPIFC)
{
TeardownUDPIFCInterconnect(transportStates, hasErrors);
}
else if (Gp_interconnect_type == INTERCONNECT_TYPE_TCP ||
Gp_interconnect_type == INTERCONNECT_TYPE_PROXY)
{
TeardownTCPInterconnect(transportStates, hasErrors);
}
if (h != NULL)
destroy_interconnect_handle(h);
}
/*=========================================================================
* HELPER FUNCTIONS
*/
/* Function createChunkTransportState() is used to create a ChunkTransportState struct and
* place it in the hashtab hashtable based on the motNodeID.
*
* PARAMETERS
*
* motNodeID - motion node ID for this ChunkTransportState.
*
* numConns - number of primary connections for this motion node.
* All are incoming if this is a receiving motion node.
* All are outgoing if this is a sending motion node.
*
* RETURNS
* An empty and initialized ChunkTransportState struct for the given motion node. If
* a ChuckTransportState struct is already registered for the motNodeID an ERROR is
* thrown.
*/
ChunkTransportStateEntry *
createChunkTransportState(ChunkTransportState *transportStates,
ExecSlice *sendSlice,
ExecSlice *recvSlice,
int numConns)
{
ChunkTransportStateEntry *pEntry;
int motNodeID;
int i;
Assert(recvSlice->sliceIndex >= 0);
Assert(sendSlice->sliceIndex > 0);
motNodeID = sendSlice->sliceIndex;
if (motNodeID > transportStates->size)
{
/* increase size of our table */
ChunkTransportStateEntry *newTable;
newTable = repalloc(transportStates->states, motNodeID * sizeof(ChunkTransportStateEntry));
transportStates->states = newTable;
/* zero-out the new piece at the end */
MemSet(&transportStates->states[transportStates->size], 0, (motNodeID - transportStates->size) * sizeof(ChunkTransportStateEntry));
transportStates->size = motNodeID;
}
pEntry = &transportStates->states[motNodeID - 1];
if (pEntry->valid)
{
ereport(ERROR,
(errcode(ERRCODE_GP_INTERCONNECTION_ERROR),
errmsg("interconnect error: A HTAB entry for motion node %d already exists",
motNodeID),
errdetail("conns %p numConns %d first sock %d",
pEntry->conns, pEntry->numConns,
pEntry->conns[0].sockfd)));
}
pEntry->valid = true;
pEntry->motNodeId = motNodeID;
pEntry->numConns = numConns;
pEntry->scanStart = 0;
pEntry->sendSlice = sendSlice;
pEntry->recvSlice = recvSlice;
pEntry->conns = palloc0(pEntry->numConns * sizeof(pEntry->conns[0]));
for (i = 0; i < pEntry->numConns; i++)
{
MotionConn *conn = &pEntry->conns[i];
/* Initialize MotionConn entry. */
conn->state = mcsNull;
conn->sockfd = -1;
conn->msgSize = 0;
conn->tupleCount = 0;
conn->stillActive = false;
conn->stopRequested = false;
conn->wakeup_ms = 0;
conn->cdbProc = NULL;
conn->sent_record_typmod = 0;
conn->remapper = NULL;
}
return pEntry;
}
/* Function removeChunkTransportState() is used to remove a ChunkTransportState struct from
* the hashtab hashtable.
*
* This should only be called after createChunkTransportState().
*
* PARAMETERS
*
* motNodeID - motion node ID to lookup the ChunkTransportState.
* pIncIdx - parent slice idx in child slice. If not multiplexed, should be 1.
*
* RETURNS
* The ChunkTransportState that was removed from the hashtab hashtable.
*/
ChunkTransportStateEntry *
removeChunkTransportState(ChunkTransportState *transportStates,
int16 motNodeID)
{
ChunkTransportStateEntry *pEntry = NULL;
if (motNodeID > transportStates->size)
{
ereport(ERROR,
(errcode(ERRCODE_GP_INTERCONNECTION_ERROR),
errmsg("interconnect error: Unexpected Motion Node Id: %d",
motNodeID),
errdetail("During remove. (size %d)", transportStates->size)));
}
else if (!transportStates->states[motNodeID - 1].valid)
{
ereport(ERROR,
(errcode(ERRCODE_GP_INTERCONNECTION_ERROR),
errmsg("interconnect error: Unexpected Motion Node Id: %d",
motNodeID),
errdetail("During remove. State not valid")));
}
else
{
transportStates->states[motNodeID - 1].valid = false;
pEntry = &transportStates->states[motNodeID - 1];
}
MPP_FD_ZERO(&pEntry->readSet);
return pEntry;
}
/*
* checkForCancelFromQD
* Check for cancel from QD.
*
* Should be called only inside the dispatcher
*/
void
checkForCancelFromQD(ChunkTransportState *pTransportStates)
{
Assert(Gp_role == GP_ROLE_DISPATCH);
Assert(pTransportStates);
Assert(pTransportStates->estate);
if (cdbdisp_checkForCancel(pTransportStates->estate->dispatcherState))
{
ereport(ERROR, (errcode(ERRCODE_GP_INTERCONNECTION_ERROR),
errmsg(CDB_MOTION_LOST_CONTACT_STRING)));
/* not reached */
}
}
/*
* WaitInterconnectQuit
*
* Wait for the ic thread to quit, don't clean any resource owned by ic thread
*/
void
WaitInterconnectQuit(void)
{
if (Gp_interconnect_type == INTERCONNECT_TYPE_UDPIFC)
{
WaitInterconnectQuitUDPIFC();
}
}
interconnect_handle_t *
allocate_interconnect_handle(void)
{
interconnect_handle_t *h;
if (InterconnectContext == NULL)
InterconnectContext = AllocSetContextCreate(TopMemoryContext,
"Interconnect Context",
ALLOCSET_DEFAULT_MINSIZE,
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE);
h = MemoryContextAllocZero(InterconnectContext, sizeof(interconnect_handle_t));
h->owner = CurrentResourceOwner;
h->next = open_interconnect_handles;
h->prev = NULL;
if (open_interconnect_handles)
open_interconnect_handles->prev = h;
open_interconnect_handles = h;
if (!interconnect_resowner_callback_registered)
{
RegisterResourceReleaseCallback(interconnect_abort_callback, NULL);
interconnect_resowner_callback_registered = true;
}
return h;
}
static void
destroy_interconnect_handle(interconnect_handle_t *h)
{
h->interconnect_context = NULL;
/* unlink from linked list first */
if (h->prev)
h->prev->next = h->next;
else
open_interconnect_handles = h->next;
if (h->next)
h->next->prev = h->prev;
pfree(h);
if (open_interconnect_handles == NULL)
MemoryContextReset(InterconnectContext);
}
static interconnect_handle_t *
find_interconnect_handle(ChunkTransportState *icContext)
{
interconnect_handle_t *head = open_interconnect_handles;
while (head != NULL)
{
if (head->interconnect_context == icContext)
return head;
head = head->next;
}
return NULL;
}
static void
cleanup_interconnect_handle(interconnect_handle_t *h)
{
if (h->interconnect_context == NULL)
{
destroy_interconnect_handle(h);
return;
}
TeardownInterconnect(h->interconnect_context, true);
}
static void
interconnect_abort_callback(ResourceReleasePhase phase,
bool isCommit,
bool isTopLevel,
void *arg)
{
interconnect_handle_t *curr;
interconnect_handle_t *next;
if (phase != RESOURCE_RELEASE_AFTER_LOCKS)
return;
next = open_interconnect_handles;
while (next)
{
curr = next;
next = curr->next;
if (curr->owner == CurrentResourceOwner)
{
if (isCommit)
elog(WARNING, "interconnect reference leak: %p still referenced", curr);
cleanup_interconnect_handle(curr);
}
}
}
/*
* format_sockaddr
* Format a sockaddr to a human readable string
*
* This function must be kept threadsafe, elog/ereport/palloc etc are not
* allowed within this function.
*/
char *
format_sockaddr(struct sockaddr_storage *sa, char *buf, size_t len)
{
int ret;
char remote_host[NI_MAXHOST];
char remote_port[NI_MAXSERV];
ret = pg_getnameinfo_all(sa, sizeof(struct sockaddr_storage),
remote_host, sizeof(remote_host),
remote_port, sizeof(remote_port),
NI_NUMERICHOST | NI_NUMERICSERV);
if (ret != 0)
snprintf(buf, len, "?host?:?port?");
else
{
#ifdef HAVE_IPV6
if (sa->ss_family == AF_INET6)
snprintf(buf, len, "[%s]:%s", remote_host, remote_port);
else
#endif
snprintf(buf, len, "%s:%s", remote_host, remote_port);
}
return buf;
}
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