A bit of code beautification/cleanup of obsolete comments. Rethink
ordering of startup operations in one or two places.
This commit is contained in:
Tom Lane
parent
90e2663313
commit
f3868f8af9
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@ -22,13 +22,22 @@
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* if it did much with shared memory then it would be prone to crashing
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* along with the backends.
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*
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* When a request message is received, we now fork() immediately.
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* The child process performs authentication of the request, and
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* then becomes a backend if successful. This allows the auth code
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* to be written in a simple single-threaded style (as opposed to the
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* crufty "poor man's multitasking" code that used to be needed).
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* More importantly, it ensures that blockages in non-multithreaded
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* libraries like SSL or PAM cannot cause denial of service to other
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* clients.
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*
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*
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.224 2001/06/20 18:07:55 petere Exp $
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* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.225 2001/06/21 16:43:24 tgl Exp $
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*
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* NOTES
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*
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@ -102,17 +111,16 @@
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#ifdef HAVE_SIGPROCMASK
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sigset_t UnBlockSig,
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BlockSig;
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#else
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int UnBlockSig,
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BlockSig;
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#endif
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/*
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* Info for garbage collection. Whenever a process dies, the Postmaster
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* cleans up after it. Currently, NO information is required for cleanup,
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* but I left this structure around in case that changed.
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* List of active backends (or child processes anyway; we don't actually
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* know whether a given child has become a backend or is still in the
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* authorization phase). This is used mainly to keep track of how many
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* children we have and send them appropriate signals when necessary.
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*/
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typedef struct bkend
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{
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@ -120,7 +128,6 @@ typedef struct bkend
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long cancel_key; /* cancel key for cancels for this backend */
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} Backend;
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/* list of active backends. For garbage collection only now. */
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static Dllist *BackendList;
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/* The socket number we are listening for connections on */
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@ -155,12 +162,10 @@ static int ServerSock_INET = INVALID_SOCK; /* stream socket server */
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#ifdef HAVE_UNIX_SOCKETS
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static int ServerSock_UNIX = INVALID_SOCK; /* stream socket server */
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#endif
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#ifdef USE_SSL
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static SSL_CTX *SSL_context = NULL; /* Global SSL context */
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#endif
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/*
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@ -178,12 +183,14 @@ static char ExtraOptions[MAXPGPATH];
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static bool Reinit = true;
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static int SendStop = false;
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/* still more option variables */
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bool NetServer = false; /* listen on TCP/IP */
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bool EnableSSL = false;
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bool SilentMode = false; /* silent mode (-S) */
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int CheckPointTimeout = 300;
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/* Startup/shutdown state */
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static pid_t StartupPID = 0,
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ShutdownPID = 0,
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CheckPointPID = 0;
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@ -230,7 +237,7 @@ static void ExitPostmaster(int status);
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static void usage(const char *);
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static int ServerLoop(void);
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static int BackendStartup(Port *port);
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static int ProcessStartupPacket(Port *port);
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static int ProcessStartupPacket(Port *port, bool SSLdone);
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static void processCancelRequest(Port *port, void *pkt);
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static int initMasks(fd_set *rmask, fd_set *wmask);
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static char *canAcceptConnections(void);
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@ -579,6 +586,20 @@ PostmasterMain(int argc, char *argv[])
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fprintf(stderr, "-----------------------------------------\n");
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}
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/*
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* Initialize SSL library, if specified.
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*/
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#ifdef USE_SSL
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if (EnableSSL && !NetServer)
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{
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postmaster_error("For SSL, TCP/IP connections must be enabled.");
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fprintf(stderr, gettext("Try '%s --help' for more information.\n"), progname);
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ExitPostmaster(1);
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}
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if (EnableSSL)
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InitSSL();
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#endif
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/*
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* Fork away from controlling terminal, if -S specified.
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*
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@ -609,17 +630,6 @@ PostmasterMain(int argc, char *argv[])
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/*
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* Establish input sockets.
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*/
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#ifdef USE_SSL
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if (EnableSSL && !NetServer)
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{
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postmaster_error("For SSL, TCP/IP connections must be enabled.");
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fprintf(stderr, gettext("Try '%s --help' for more information.\n"), progname);
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ExitPostmaster(1);
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}
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if (EnableSSL)
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InitSSL();
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#endif
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if (NetServer)
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{
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status = StreamServerPort(AF_INET, VirtualHost,
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@ -653,8 +663,7 @@ PostmasterMain(int argc, char *argv[])
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reset_shared(PostPortNumber);
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/*
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* Initialize the list of active backends. This list is only used for
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* garbage collecting the backend processes.
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* Initialize the list of active backends.
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*/
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BackendList = DLNewList();
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@ -811,7 +820,6 @@ ServerLoop(void)
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if (CheckPointTimeout + checkpointed > now)
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{
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/*
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* Not time for checkpoint yet, so set a timeout for
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* select
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@ -883,7 +891,8 @@ ServerLoop(void)
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}
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/*
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* new connection pending on our well-known port's socket?
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* New connection pending on our well-known port's socket?
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* If so, fork a child process to deal with it.
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*/
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#ifdef HAVE_UNIX_SOCKETS
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@ -892,9 +901,15 @@ ServerLoop(void)
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{
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port = ConnCreate(ServerSock_UNIX);
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if (port)
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{
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BackendStartup(port);
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StreamClose(port->sock);
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ConnFree(port);
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/*
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* We no longer need the open socket or port structure
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* in this process
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*/
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StreamClose(port->sock);
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ConnFree(port);
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}
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}
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#endif
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@ -903,9 +918,15 @@ ServerLoop(void)
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{
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port = ConnCreate(ServerSock_INET);
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if (port)
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{
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BackendStartup(port);
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StreamClose(port->sock);
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ConnFree(port);
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/*
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* We no longer need the open socket or port structure
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* in this process
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*/
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StreamClose(port->sock);
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ConnFree(port);
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}
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}
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}
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}
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@ -952,7 +973,7 @@ initMasks(fd_set *rmask, fd_set *wmask)
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* not return at all.
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*/
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static int
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ProcessStartupPacket(Port *port)
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ProcessStartupPacket(Port *port, bool SSLdone)
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{
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StartupPacket *packet;
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char *rejectMsg;
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@ -983,7 +1004,7 @@ ProcessStartupPacket(Port *port)
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return 127; /* XXX */
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}
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if (port->proto == NEGOTIATE_SSL_CODE)
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if (port->proto == NEGOTIATE_SSL_CODE && !SSLdone)
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{
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char SSLok;
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@ -1016,10 +1037,9 @@ ProcessStartupPacket(Port *port)
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}
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}
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#endif
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/* regular startup packet should follow... */
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/* FIXME: by continuing to send SSL negotiation packets, a
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client could run us out of stack space */
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return ProcessStartupPacket(port);
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/* regular startup packet, cancel, etc packet should follow... */
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/* but not another SSL negotiation request */
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return ProcessStartupPacket(port, true);
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}
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/* Could add additional special packet types here */
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@ -1211,11 +1231,8 @@ ConnFree(Port *conn)
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* ClosePostmasterPorts -- close all the postmaster's open sockets
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*
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* This is called during child process startup to release file descriptors
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* that are not needed by that child process.
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*
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* Note that closing the child's descriptor does not destroy the client
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* connection prematurely, since the parent (postmaster) process still
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* has the socket open.
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* that are not needed by that child process. The postmaster still has
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* them open, of course.
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*/
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static void
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ClosePostmasterPorts(void)
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@ -1685,9 +1702,7 @@ SignalChildren(int signal)
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/*
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* BackendStartup -- start backend process
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*
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* returns: STATUS_ERROR if the fork/exec failed, STATUS_OK
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* otherwise.
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*
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* returns: STATUS_ERROR if the fork/exec failed, STATUS_OK otherwise.
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*/
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static int
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BackendStartup(Port *port)
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@ -1814,7 +1829,8 @@ split_opts(char **argv, int *argcp, char *s)
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}
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/*
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* DoBackend -- set up the backend's argument list and invoke backend main().
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* DoBackend -- perform authentication, and if successful, set up the
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* backend's argument list and invoke backend main().
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*
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* This used to perform an execv() but we no longer exec the backend;
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* it's the same executable as the postmaster.
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@ -1849,6 +1865,9 @@ DoBackend(Port *port)
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* Signal handlers setting is moved to tcop/postgres...
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*/
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/* Close the postmaster's other sockets */
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ClosePostmasterPorts();
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SetProcessingMode(InitProcessing);
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/* Save port etc. for ps status */
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@ -1859,13 +1878,10 @@ DoBackend(Port *port)
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whereToSendOutput = Remote;
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status = ProcessStartupPacket(port);
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status = ProcessStartupPacket(port, false);
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if (status == 127)
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return 0; /* cancel request processed */
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/* Close the postmaster's other sockets */
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ClosePostmasterPorts();
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/*
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* Don't want backend to be able to see the postmaster random number
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* generator state. We have to clobber the static random_seed *and*
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