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Move initialization of the Port struct to the child process

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In postmaster, use a more lightweight ClientSocket struct that
encapsulates just the socket itself and the remote endpoint's address
that you get from accept() call. ClientSocket is passed to the child
process, which initializes the bigger Port struct. This makes it more
clear what information postmaster initializes, and what is left to the
child process.

Rename the StreamServerPort and StreamConnection functions to make it
more clear what they do. Remove StreamClose, replacing it with plain
closesocket() calls.

Reviewed-by: Tristan Partin, Andres Freund
Discussion: https://www.postgresql.org/message-id/7a59b073-5b5b-151e-7ed3-8b01ff7ce9ef@iki.fi
This commit is contained in:
Heikki Linnakangas
2024-03-12 13:42:38 +02:00
parent d162c3a73b
commit 4945e4ed4a
6 changed files with 142 additions and 185 deletions
Download Patch File Download Diff File Expand all files Collapse all files

63
src/backend/libpq/pqcomm.c
View File

@ -29,9 +29,8 @@
* INTERFACE ROUTINES
*
* setup/teardown:
* StreamServerPort - Open postmaster's server port
* StreamConnection - Create new connection with client
* StreamClose - Close a client/backend connection
* ListenServerPort - Open postmaster's server port
* AcceptConnection - Accept new connection with client
* TouchSocketFiles - Protect socket files against /tmp cleaners
* pq_init - initialize libpq at backend startup
* socket_comm_reset - reset libpq during error recovery
@ -168,13 +167,18 @@ WaitEventSet *FeBeWaitSet;
* pq_init - initialize libpq at backend startup
* --------------------------------
*/
void
pq_init(void)
Port *
pq_init(ClientSocket *client_sock)
{
Port *port = MyProcPort;
Port *port;
int socket_pos PG_USED_FOR_ASSERTS_ONLY;
int latch_pos PG_USED_FOR_ASSERTS_ONLY;
/* allocate the Port struct and copy the ClientSocket contents to it */
port = palloc0(sizeof(Port));
port->sock = client_sock->sock;
port->raddr = client_sock->raddr;
/* fill in the server (local) address */
port->laddr.salen = sizeof(port->laddr.addr);
if (getsockname(port->sock,
@ -310,6 +314,8 @@ pq_init(void)
*/
Assert(socket_pos == FeBeWaitSetSocketPos);
Assert(latch_pos == FeBeWaitSetLatchPos);
return port;
}
/* --------------------------------
@ -384,16 +390,13 @@ socket_close(int code, Datum arg)
/*
* Streams -- wrapper around Unix socket system calls
*
*
* Stream functions are used for vanilla TCP connection protocol.
/* --------------------------------
* Postmaster functions to handle sockets.
* --------------------------------
*/
/*
* StreamServerPort -- open a "listening" port to accept connections.
* ListenServerPort -- open a "listening" port to accept connections.
*
* family should be AF_UNIX or AF_UNSPEC; portNumber is the port number.
* For AF_UNIX ports, hostName should be NULL and unixSocketDir must be
@ -408,7 +411,7 @@ socket_close(int code, Datum arg)
* RETURNS: STATUS_OK or STATUS_ERROR
*/
int
StreamServerPort(int family, const char *hostName, unsigned short portNumber,
ListenServerPort(int family, const char *hostName, unsigned short portNumber,
const char *unixSocketDir,
pgsocket ListenSockets[], int *NumListenSockets, int MaxListen)
{
@ -774,8 +777,9 @@ Setup_AF_UNIX(const char *sock_path)
/*
* StreamConnection -- create a new connection with client using
* server port. Set port->sock to the FD of the new connection.
* AcceptConnection -- accept a new connection with client using
* server port. Fills *client_sock with the FD and endpoint info
* of the new connection.
*
* ASSUME: that this doesn't need to be non-blocking because
* the Postmaster waits for the socket to be ready to accept().
@ -783,13 +787,13 @@ Setup_AF_UNIX(const char *sock_path)
* RETURNS: STATUS_OK or STATUS_ERROR
*/
int
StreamConnection(pgsocket server_fd, Port *port)
AcceptConnection(pgsocket server_fd, ClientSocket *client_sock)
{
/* accept connection and fill in the client (remote) address */
port->raddr.salen = sizeof(port->raddr.addr);
if ((port->sock = accept(server_fd,
(struct sockaddr *) &port->raddr.addr,
&port->raddr.salen)) == PGINVALID_SOCKET)
client_sock->raddr.salen = sizeof(client_sock->raddr.addr);
if ((client_sock->sock = accept(server_fd,
(struct sockaddr *) &client_sock->raddr.addr,
&client_sock->raddr.salen)) == PGINVALID_SOCKET)
{
ereport(LOG,
(errcode_for_socket_access(),
@ -809,23 +813,6 @@ StreamConnection(pgsocket server_fd, Port *port)
return STATUS_OK;
}
/*
* StreamClose -- close a client/backend connection
*
* NOTE: this is NOT used to terminate a session; it is just used to release
* the file descriptor in a process that should no longer have the socket
* open. (For example, the postmaster calls this after passing ownership
* of the connection to a child process.) It is expected that someone else
* still has the socket open. So, we only want to close the descriptor,
* we do NOT want to send anything to the far end.
*/
void
StreamClose(pgsocket sock)
{
if (closesocket(sock) != 0)
elog(LOG, "could not close client or listen socket: %m");
}
/*
* TouchSocketFiles -- mark socket files as recently accessed
*

229
src/backend/postmaster/postmaster.c
View File

@ -399,8 +399,6 @@ static void CloseServerPorts(int status, Datum arg);
static void unlink_external_pid_file(int status, Datum arg);
static void getInstallationPaths(const char *argv0);
static void checkControlFile(void);
static Port *ConnCreate(int serverFd);
static void ConnFree(Port *port);
static void handle_pm_pmsignal_signal(SIGNAL_ARGS);
static void handle_pm_child_exit_signal(SIGNAL_ARGS);
static void handle_pm_reload_request_signal(SIGNAL_ARGS);
@ -430,15 +428,15 @@ typedef enum CAC_state
CAC_TOOMANY,
} CAC_state;
static void BackendInitialize(Port *port, CAC_state cac);
static void BackendRun(Port *port) pg_attribute_noreturn();
static void BackendInitialize(ClientSocket *client_sock, CAC_state cac);
static void BackendRun(void) pg_attribute_noreturn();
static void ExitPostmaster(int status) pg_attribute_noreturn();
static int ServerLoop(void);
static int BackendStartup(Port *port);
static int BackendStartup(ClientSocket *client_sock);
static int ProcessStartupPacket(Port *port, bool ssl_done, bool gss_done);
static void SendNegotiateProtocolVersion(List *unrecognized_protocol_options);
static void processCancelRequest(Port *port, void *pkt);
static void report_fork_failure_to_client(Port *port, int errnum);
static void report_fork_failure_to_client(ClientSocket *client_sock, int errnum);
static CAC_state canAcceptConnections(int backend_type);
static bool RandomCancelKey(int32 *cancel_key);
static void signal_child(pid_t pid, int signal);
@ -489,8 +487,8 @@ typedef struct
} win32_deadchild_waitinfo;
#endif /* WIN32 */
static pid_t backend_forkexec(Port *port, CAC_state cac);
static pid_t internal_forkexec(int argc, char *argv[], Port *port, BackgroundWorker *worker);
static pid_t backend_forkexec(ClientSocket *client_sock, CAC_state cac);
static pid_t internal_forkexec(int argc, char *argv[], ClientSocket *client_sock, BackgroundWorker *worker);
/* Type for a socket that can be inherited to a client process */
#ifdef WIN32
@ -509,9 +507,9 @@ typedef int InheritableSocket;
*/
typedef struct
{
bool has_port;
Port port;
InheritableSocket portsocket;
bool has_client_sock;
ClientSocket client_sock;
InheritableSocket inh_sock;
bool has_bgworker;
BackgroundWorker bgworker;
@ -560,13 +558,13 @@ typedef struct
char pkglib_path[MAXPGPATH];
} BackendParameters;
static void read_backend_variables(char *id, Port **port, BackgroundWorker **worker);
static void restore_backend_variables(BackendParameters *param, Port **port, BackgroundWorker **worker);
static void read_backend_variables(char *id, ClientSocket **client_sock, BackgroundWorker **worker);
static void restore_backend_variables(BackendParameters *param, ClientSocket **client_sock, BackgroundWorker **worker);
#ifndef WIN32
static bool save_backend_variables(BackendParameters *param, Port *port, BackgroundWorker *worker);
static bool save_backend_variables(BackendParameters *param, ClientSocket *client_sock, BackgroundWorker *worker);
#else
static bool save_backend_variables(BackendParameters *param, Port *port, BackgroundWorker *worker,
static bool save_backend_variables(BackendParameters *param, ClientSocket *client_sock, BackgroundWorker *worker,
HANDLE childProcess, pid_t childPid);
#endif
@ -1222,14 +1220,14 @@ PostmasterMain(int argc, char *argv[])
char *curhost = (char *) lfirst(l);
if (strcmp(curhost, "*") == 0)
status = StreamServerPort(AF_UNSPEC, NULL,
status = ListenServerPort(AF_UNSPEC, NULL,
(unsigned short) PostPortNumber,
NULL,
ListenSockets,
&NumListenSockets,
MAXLISTEN);
else
status = StreamServerPort(AF_UNSPEC, curhost,
status = ListenServerPort(AF_UNSPEC, curhost,
(unsigned short) PostPortNumber,
NULL,
ListenSockets,
@ -1323,7 +1321,7 @@ PostmasterMain(int argc, char *argv[])
{
char *socketdir = (char *) lfirst(l);
status = StreamServerPort(AF_UNIX, NULL,
status = ListenServerPort(AF_UNIX, NULL,
(unsigned short) PostPortNumber,
socketdir,
ListenSockets,
@ -1503,7 +1501,10 @@ CloseServerPorts(int status, Datum arg)
* condition if a new postmaster wants to re-use the TCP port number.
*/
for (i = 0; i < NumListenSockets; i++)
StreamClose(ListenSockets[i]);
{
if (closesocket(ListenSockets[i]) != 0)
elog(LOG, "could not close listen socket: %m");
}
NumListenSockets = 0;
/*
@ -1773,19 +1774,16 @@ ServerLoop(void)
if (events[i].events & WL_SOCKET_ACCEPT)
{
Port *port;
ClientSocket s;
port = ConnCreate(events[i].fd);
if (port)
if (AcceptConnection(events[i].fd, &s) == STATUS_OK)
BackendStartup(&s);
/* We no longer need the open socket in this process */
if (s.sock != PGINVALID_SOCKET)
{
BackendStartup(port);
/*
* We no longer need the open socket or port structure in
* this process
*/
StreamClose(port->sock);
ConnFree(port);
if (closesocket(s.sock) != 0)
elog(LOG, "could not close client socket: %m");
}
}
}
@ -2157,11 +2155,7 @@ retry1:
/*
* Now fetch parameters out of startup packet and save them into the Port
* structure. All data structures attached to the Port struct must be
* allocated in TopMemoryContext so that they will remain available in a
* running backend (even after PostmasterContext is destroyed). We need
* not worry about leaking this storage on failure, since we aren't in the
* postmaster process anymore.
* structure.
*/
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
@ -2297,7 +2291,7 @@ retry1:
port->database_name[0] = '\0';
/*
* Done putting stuff in TopMemoryContext.
* Done filling the Port structure
*/
MemoryContextSwitchTo(oldcontext);
@ -2454,50 +2448,6 @@ canAcceptConnections(int backend_type)
return result;
}
/*
* ConnCreate -- create a local connection data structure
*
* Returns NULL on failure, other than out-of-memory which is fatal.
*/
static Port *
ConnCreate(int serverFd)
{
Port *port;
if (!(port = (Port *) calloc(1, sizeof(Port))))
{
ereport(LOG,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
ExitPostmaster(1);
}
if (StreamConnection(serverFd, port) != STATUS_OK)
{
if (port->sock != PGINVALID_SOCKET)
StreamClose(port->sock);
ConnFree(port);
return NULL;
}
return port;
}
/*
* ConnFree -- free a local connection data structure
*
* Caller has already closed the socket if any, so there's not much
* to do here.
*/
static void
ConnFree(Port *port)
{
free(port);
}
/*
* ClosePostmasterPorts -- close all the postmaster's open sockets
*
@ -2545,7 +2495,10 @@ ClosePostmasterPorts(bool am_syslogger)
if (ListenSockets)
{
for (int i = 0; i < NumListenSockets; i++)
StreamClose(ListenSockets[i]);
{
if (closesocket(ListenSockets[i]) != 0)
elog(LOG, "could not close listen socket: %m");
}
pfree(ListenSockets);
}
NumListenSockets = 0;
@ -4095,7 +4048,7 @@ TerminateChildren(int signal)
* Note: if you change this code, also consider StartAutovacuumWorker.
*/
static int
BackendStartup(Port *port)
BackendStartup(ClientSocket *client_sock)
{
Backend *bn; /* for backend cleanup */
pid_t pid;
@ -4146,7 +4099,7 @@ BackendStartup(Port *port)
bn->bgworker_notify = false;
#ifdef EXEC_BACKEND
pid = backend_forkexec(port, cac);
pid = backend_forkexec(client_sock, cac);
#else /* !EXEC_BACKEND */
pid = fork_process();
if (pid == 0) /* child */
@ -4158,10 +4111,10 @@ BackendStartup(Port *port)
ClosePostmasterPorts(false);
/* Perform additional initialization and collect startup packet */
BackendInitialize(port, cac);
BackendInitialize(client_sock, cac);
/* And run the backend */
BackendRun(port);
BackendRun();
}
#endif /* EXEC_BACKEND */
@ -4176,14 +4129,14 @@ BackendStartup(Port *port)
errno = save_errno;
ereport(LOG,
(errmsg("could not fork new process for connection: %m")));
report_fork_failure_to_client(port, save_errno);
report_fork_failure_to_client(client_sock, save_errno);
return STATUS_ERROR;
}
/* in parent, successful fork */
ereport(DEBUG2,
(errmsg_internal("forked new backend, pid=%d socket=%d",
(int) pid, (int) port->sock)));
(int) pid, (int) client_sock->sock)));
/*
* Everything's been successful, it's safe to add this backend to our list
@ -4210,7 +4163,7 @@ BackendStartup(Port *port)
* it's not up and running.
*/
static void
report_fork_failure_to_client(Port *port, int errnum)
report_fork_failure_to_client(ClientSocket *client_sock, int errnum)
{
char buffer[1000];
int rc;
@ -4221,13 +4174,13 @@ report_fork_failure_to_client(Port *port, int errnum)
strerror(errnum));
/* Set port to non-blocking. Don't do send() if this fails */
if (!pg_set_noblock(port->sock))
if (!pg_set_noblock(client_sock->sock))
return;
/* We'll retry after EINTR, but ignore all other failures */
do
{
rc = send(port->sock, buffer, strlen(buffer) + 1, 0);
rc = send(client_sock->sock, buffer, strlen(buffer) + 1, 0);
} while (rc < 0 && errno == EINTR);
}
@ -4245,18 +4198,17 @@ report_fork_failure_to_client(Port *port, int errnum)
* but have not yet set up most of our local pointers to shmem structures.
*/
static void
BackendInitialize(Port *port, CAC_state cac)
BackendInitialize(ClientSocket *client_sock, CAC_state cac)
{
int status;
int ret;
Port *port;
char remote_host[NI_MAXHOST];
char remote_port[NI_MAXSERV];
StringInfoData ps_data;
MemoryContext oldcontext;
/* Save port etc. for ps status */
MyProcPort = port;
/* Tell fd.c about the long-lived FD associated with the port */
/* Tell fd.c about the long-lived FD associated with the client_sock */
ReserveExternalFD();
/*
@ -4272,17 +4224,25 @@ BackendInitialize(Port *port, CAC_state cac)
/* This flag will remain set until InitPostgres finishes authentication */
ClientAuthInProgress = true; /* limit visibility of log messages */
/* set these to empty in case they are needed before we set them up */
port->remote_host = "";
port->remote_port = "";
/*
* Initialize libpq and enable reporting of ereport errors to the client.
* Must do this now because authentication uses libpq to send messages.
*
* The Port structure and all data structures attached to it are allocated
* in TopMemoryContext, so that they survive into PostgresMain execution.
* We need not worry about leaking this storage on failure, since we
* aren't in the postmaster process anymore.
*/
pq_init(); /* initialize libpq to talk to client */
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
port = MyProcPort = pq_init(client_sock);
MemoryContextSwitchTo(oldcontext);
whereToSendOutput = DestRemote; /* now safe to ereport to client */
/* set these to empty in case they are needed before we set them up */
port->remote_host = "";
port->remote_port = "";
/*
* We arrange to do _exit(1) if we receive SIGTERM or timeout while trying
* to collect the startup packet; while SIGQUIT results in _exit(2).
@ -4315,8 +4275,9 @@ BackendInitialize(Port *port, CAC_state cac)
* Save remote_host and remote_port in port structure (after this, they
* will appear in log_line_prefix data for log messages).
*/
port->remote_host = strdup(remote_host);
port->remote_port = strdup(remote_port);
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
port->remote_host = pstrdup(remote_host);
port->remote_port = pstrdup(remote_port);
/* And now we can issue the Log_connections message, if wanted */
if (Log_connections)
@ -4347,7 +4308,10 @@ BackendInitialize(Port *port, CAC_state cac)
ret == 0 &&
strspn(remote_host, "0123456789.") < strlen(remote_host) &&
strspn(remote_host, "0123456789ABCDEFabcdef:") < strlen(remote_host))
port->remote_hostname = strdup(remote_host);
{
port->remote_hostname = pstrdup(remote_host);
}
MemoryContextSwitchTo(oldcontext);
/*
* Ready to begin client interaction. We will give up and _exit(1) after
@ -4471,7 +4435,7 @@ BackendInitialize(Port *port, CAC_state cac)
* Doesn't return at all.
*/
static void
BackendRun(Port *port)
BackendRun(void)
{
/*
* Create a per-backend PGPROC struct in shared memory. We must do this
@ -4485,7 +4449,7 @@ BackendRun(Port *port)
*/
MemoryContextSwitchTo(TopMemoryContext);
PostgresMain(port->database_name, port->user_name);
PostgresMain(MyProcPort->database_name, MyProcPort->user_name);
}
@ -4519,7 +4483,7 @@ postmaster_forkexec(int argc, char *argv[])
* returns the pid of the fork/exec'd process, or -1 on failure
*/
static pid_t
backend_forkexec(Port *port, CAC_state cac)
backend_forkexec(ClientSocket *client_sock, CAC_state cac)
{
char *av[5];
int ac = 0;
@ -4535,7 +4499,7 @@ backend_forkexec(Port *port, CAC_state cac)
av[ac] = NULL;
Assert(ac < lengthof(av));
return internal_forkexec(ac, av, port, NULL);
return internal_forkexec(ac, av, client_sock, NULL);
}
#ifndef WIN32
@ -4547,7 +4511,7 @@ backend_forkexec(Port *port, CAC_state cac)
* - fork():s, and then exec():s the child process
*/
static pid_t
internal_forkexec(int argc, char *argv[], Port *port, BackgroundWorker *worker)
internal_forkexec(int argc, char *argv[], ClientSocket *client_sock, BackgroundWorker *worker)
{
static unsigned long tmpBackendFileNum = 0;
pid_t pid;
@ -4563,7 +4527,7 @@ internal_forkexec(int argc, char *argv[], Port *port, BackgroundWorker *worker)
*/
memset(&param, 0, sizeof(BackendParameters));
if (!save_backend_variables(&param, port, worker))
if (!save_backend_variables(&param, client_sock, worker))
return -1; /* log made by save_backend_variables */
/* Calculate name for temp file */
@ -4647,7 +4611,7 @@ internal_forkexec(int argc, char *argv[], Port *port, BackgroundWorker *worker)
* file is complete.
*/
static pid_t
internal_forkexec(int argc, char *argv[], Port *port, BackgroundWorker *worker)
internal_forkexec(int argc, char *argv[], ClientSocket *client_sock, BackgroundWorker *worker)
{
int retry_count = 0;
STARTUPINFO si;
@ -4744,7 +4708,7 @@ retry:
return -1;
}
if (!save_backend_variables(param, port, worker, pi.hProcess, pi.dwProcessId))
if (!save_backend_variables(param, client_sock, worker, pi.hProcess, pi.dwProcessId))
{
/*
* log made by save_backend_variables, but we have to clean up the
@ -4861,7 +4825,7 @@ retry:
void
SubPostmasterMain(int argc, char *argv[])
{
Port *port;
ClientSocket *client_sock;
BackgroundWorker *worker;
/* In EXEC_BACKEND case we will not have inherited these settings */
@ -4876,7 +4840,7 @@ SubPostmasterMain(int argc, char *argv[])
elog(FATAL, "invalid subpostmaster invocation");
/* Read in the variables file */
read_backend_variables(argv[2], &port, &worker);
read_backend_variables(argv[2], &client_sock, &worker);
/* Close the postmaster's sockets (as soon as we know them) */
ClosePostmasterPorts(strcmp(argv[1], "--forklog") == 0);
@ -4975,13 +4939,14 @@ SubPostmasterMain(int argc, char *argv[])
* PGPROC slots, we have already initialized libpq and are able to
* report the error to the client.
*/
BackendInitialize(port, cac);
BackendInitialize(client_sock, cac);
/* Restore basic shared memory pointers */
InitShmemAccess(UsedShmemSegAddr);
/* And run the backend */
BackendRun(port); /* does not return */
BackendRun(); /* does not return */
}
if (strcmp(argv[1], "--forkaux") == 0)
{
@ -6101,24 +6066,24 @@ static void read_inheritable_socket(SOCKET *dest, InheritableSocket *src);
/* Save critical backend variables into the BackendParameters struct */
#ifndef WIN32
static bool
save_backend_variables(BackendParameters *param, Port *port, BackgroundWorker *worker)
save_backend_variables(BackendParameters *param, ClientSocket *client_sock, BackgroundWorker *worker)
#else
static bool
save_backend_variables(BackendParameters *param, Port *port, BackgroundWorker *worker,
save_backend_variables(BackendParameters *param, ClientSocket *client_sock, BackgroundWorker *worker,
HANDLE childProcess, pid_t childPid)
#endif
{
if (port)
if (client_sock)
{
memcpy(&param->port, port, sizeof(Port));
if (!write_inheritable_socket(&param->portsocket, port->sock, childPid))
memcpy(&param->client_sock, client_sock, sizeof(ClientSocket));
if (!write_inheritable_socket(&param->inh_sock, client_sock->sock, childPid))
return false;
param->has_port = true;
param->has_client_sock = true;
}
else
{
memset(&param->port, 0, sizeof(Port));
param->has_port = false;
memset(&param->client_sock, 0, sizeof(ClientSocket));
param->has_client_sock = false;
}
if (worker)
@ -6285,7 +6250,7 @@ read_inheritable_socket(SOCKET *dest, InheritableSocket *src)
#endif
static void
read_backend_variables(char *id, Port **port, BackgroundWorker **worker)
read_backend_variables(char *id, ClientSocket **client_sock, BackgroundWorker **worker)
{
BackendParameters param;
@ -6349,21 +6314,21 @@ read_backend_variables(char *id, Port **port, BackgroundWorker **worker)
}
#endif
restore_backend_variables(&param, port, worker);
restore_backend_variables(&param, client_sock, worker);
}
/* Restore critical backend variables from the BackendParameters struct */
static void
restore_backend_variables(BackendParameters *param, Port **port, BackgroundWorker **worker)
restore_backend_variables(BackendParameters *param, ClientSocket **client_sock, BackgroundWorker **worker)
{
if (param->has_port)
if (param->has_client_sock)
{
*port = (Port *) MemoryContextAlloc(TopMemoryContext, sizeof(Port));
memcpy(*port, &param->port, sizeof(Port));
read_inheritable_socket(&(*port)->sock, &param->portsocket);
*client_sock = (ClientSocket *) MemoryContextAlloc(TopMemoryContext, sizeof(ClientSocket));
memcpy(*client_sock, &param->client_sock, sizeof(ClientSocket));
read_inheritable_socket(&(*client_sock)->sock, &param->inh_sock);
}
else
*port = NULL;
*client_sock = NULL;
if (param->has_bgworker)
{
@ -6429,7 +6394,7 @@ restore_backend_variables(BackendParameters *param, Port **port, BackgroundWorke
/*
* We need to restore fd.c's counts of externally-opened FDs; to avoid
* confusion, be sure to do this after restoring max_safe_fds. (Note:
* BackendInitialize will handle this for port->sock.)
* BackendInitialize will handle this for (*client_sock)->sock.)
*/
#ifndef WIN32
if (postmaster_alive_fds[0] >= 0)

5
src/backend/tcop/postgres.c
View File

@ -4233,10 +4233,7 @@ PostgresMain(const char *dbname, const char *username)
/*
* If the PostmasterContext is still around, recycle the space; we don't
* need it anymore after InitPostgres completes. Note this does not trash
* *MyProcPort, because ConnCreate() allocated that space with malloc()
* ... else we'd need to copy the Port data first. Also, subsidiary data
* such as the username isn't lost either; see ProcessStartupPacket().
* need it anymore after InitPostgres completes.
*/
if (PostmasterContext)
{

20
src/include/libpq/libpq-be.h
View File

@ -110,12 +110,9 @@ typedef struct ClientConnectionInfo
} ClientConnectionInfo;
/*
* This is used by the postmaster in its communication with frontends. It
* contains all state information needed during this communication before the
* backend is run. The Port structure is kept in malloc'd memory and is
* still available when a backend is running (see MyProcPort). The data
* it points to must also be malloc'd, or else palloc'd in TopMemoryContext,
* so that it survives into PostgresMain execution!
* The Port structure holds state information about a client connection in a
* backend process. It is available in the global variable MyProcPort. The
* struct and all the data it points are kept in TopMemoryContext.
*
* remote_hostname is set if we did a successful reverse lookup of the
* client's IP address during connection setup.
@ -217,6 +214,17 @@ typedef struct Port
#endif
} Port;
/*
* ClientSocket holds a socket for an accepted connection, along with the
* information about the remote endpoint. This is passed from postmaster to
* the backend process.
*/
typedef struct ClientSocket
{
pgsocket sock; /* File descriptor */
SockAddr raddr; /* remote addr (client) */
} ClientSocket;
#ifdef USE_SSL
/*
* Hardcoded DH parameters, used in ephemeral DH keying. (See also

7
src/include/libpq/libpq.h
View File

@ -64,14 +64,13 @@ extern PGDLLIMPORT WaitEventSet *FeBeWaitSet;
#define FeBeWaitSetLatchPos 1
#define FeBeWaitSetNEvents 3
extern int StreamServerPort(int family, const char *hostName,
extern int ListenServerPort(int family, const char *hostName,
unsigned short portNumber, const char *unixSocketDir,
pgsocket ListenSocket[], int *NumListenSockets, int MaxListen);
extern int StreamConnection(pgsocket server_fd, Port *port);
extern void StreamClose(pgsocket sock);
extern int AcceptConnection(pgsocket server_fd, ClientSocket *client_sock);
extern void TouchSocketFiles(void);
extern void RemoveSocketFiles(void);
extern void pq_init(void);
extern Port *pq_init(ClientSocket *client_sock);
extern int pq_getbytes(char *s, size_t len);
extern void pq_startmsgread(void);
extern void pq_endmsgread(void);

1
src/tools/pgindent/typedefs.list
View File

@ -388,6 +388,7 @@ ClientCertMode
ClientCertName
ClientConnectionInfo
ClientData
ClientSocket
ClonePtrType
ClosePortalStmt
ClosePtrType