mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-08-17 16:13:29 +02:00
2457 lines
57 KiB
C
2457 lines
57 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* postmaster.c
|
|
* This program acts as a clearing house for requests to the
|
|
* POSTGRES system. Frontend programs send a startup message
|
|
* to the Postmaster and the postmaster uses the info in the
|
|
* message to setup a backend process.
|
|
*
|
|
* The postmaster also manages system-wide operations such as
|
|
* startup, shutdown, and periodic checkpoints. The postmaster
|
|
* itself doesn't do those operations, mind you --- it just forks
|
|
* off a subprocess to do them at the right times. It also takes
|
|
* care of resetting the system if a backend crashes.
|
|
*
|
|
* The postmaster process creates the shared memory and semaphore
|
|
* pools during startup, but as a rule does not touch them itself.
|
|
* In particular, it is not a member of the PROC array of backends
|
|
* and so it cannot participate in lock-manager operations. Keeping
|
|
* the postmaster away from shared memory operations makes it simpler
|
|
* and more reliable. The postmaster is almost always able to recover
|
|
* from crashes of individual backends by resetting shared memory;
|
|
* if it did much with shared memory then it would be prone to crashing
|
|
* along with the backends.
|
|
*
|
|
*
|
|
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
*
|
|
* IDENTIFICATION
|
|
* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.216 2001/06/03 14:53:56 petere Exp $
|
|
*
|
|
* NOTES
|
|
*
|
|
* Initialization:
|
|
* The Postmaster sets up a few shared memory data structures
|
|
* for the backends. It should at the very least initialize the
|
|
* lock manager.
|
|
*
|
|
* Synchronization:
|
|
* The Postmaster shares memory with the backends but should avoid
|
|
* touching shared memory, so as not to become stuck if a crashing
|
|
* backend screws up locks or shared memory. Likewise, the Postmaster
|
|
* should never block on messages from frontend clients.
|
|
*
|
|
* Garbage Collection:
|
|
* The Postmaster cleans up after backends if they have an emergency
|
|
* exit and/or core dump.
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
|
|
#include "postgres.h"
|
|
|
|
#include <unistd.h>
|
|
#include <signal.h>
|
|
#include <sys/wait.h>
|
|
#include <ctype.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/time.h>
|
|
#include <sys/socket.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <time.h>
|
|
#include <sys/param.h>
|
|
/* moved here to prevent double define */
|
|
#include <netdb.h>
|
|
#include <limits.h>
|
|
|
|
#ifdef HAVE_SYS_SELECT_H
|
|
#include <sys/select.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_GETOPT_H
|
|
#include <getopt.h>
|
|
#endif
|
|
|
|
#include "catalog/pg_database.h"
|
|
#include "commands/async.h"
|
|
#include "lib/dllist.h"
|
|
#include "libpq/auth.h"
|
|
#include "libpq/crypt.h"
|
|
#include "libpq/libpq.h"
|
|
#include "libpq/pqcomm.h"
|
|
#include "libpq/pqsignal.h"
|
|
#include "miscadmin.h"
|
|
#include "nodes/nodes.h"
|
|
#include "storage/fd.h"
|
|
#include "storage/ipc.h"
|
|
#include "storage/proc.h"
|
|
#include "access/xlog.h"
|
|
#include "tcop/tcopprot.h"
|
|
#include "utils/exc.h"
|
|
#include "utils/guc.h"
|
|
#include "utils/memutils.h"
|
|
#include "bootstrap/bootstrap.h"
|
|
|
|
#define INVALID_SOCK (-1)
|
|
#define ARGV_SIZE 64
|
|
|
|
#ifdef HAVE_SIGPROCMASK
|
|
sigset_t UnBlockSig,
|
|
BlockSig;
|
|
|
|
#else
|
|
int UnBlockSig,
|
|
BlockSig;
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Info for garbage collection. Whenever a process dies, the Postmaster
|
|
* cleans up after it. Currently, NO information is required for cleanup,
|
|
* but I left this structure around in case that changed.
|
|
*/
|
|
typedef struct bkend
|
|
{
|
|
int pid; /* process id of backend */
|
|
long cancel_key; /* cancel key for cancels for this backend */
|
|
} Backend;
|
|
|
|
/* list of active backends. For garbage collection only now. */
|
|
static Dllist *BackendList;
|
|
|
|
/* list of ports associated with still open, but incomplete connections */
|
|
static Dllist *PortList;
|
|
|
|
/* The socket number we are listening for connections on */
|
|
int PostPortNumber;
|
|
char *UnixSocketDir;
|
|
char *VirtualHost;
|
|
|
|
/*
|
|
* MaxBackends is the actual limit on the number of backends we will
|
|
* start. The default is established by configure, but it can be
|
|
* readjusted from 1..MAXBACKENDS with the postmaster -N switch. Note
|
|
* that a larger MaxBackends value will increase the size of the shared
|
|
* memory area as well as cause the postmaster to grab more kernel
|
|
* semaphores, even if you never actually use that many backends.
|
|
*/
|
|
int MaxBackends = DEF_MAXBACKENDS;
|
|
|
|
|
|
static char *progname = (char *) NULL;
|
|
static char **real_argv;
|
|
static int real_argc;
|
|
|
|
static time_t tnow;
|
|
|
|
/* flag to indicate that SIGHUP arrived during server loop */
|
|
static volatile bool got_SIGHUP = false;
|
|
|
|
/*
|
|
* Default Values
|
|
*/
|
|
static int ServerSock_INET = INVALID_SOCK; /* stream socket server */
|
|
|
|
#ifdef HAVE_UNIX_SOCKETS
|
|
static int ServerSock_UNIX = INVALID_SOCK; /* stream socket server */
|
|
|
|
#endif
|
|
|
|
#ifdef USE_SSL
|
|
static SSL_CTX *SSL_context = NULL; /* Global SSL context */
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Set by the -o option
|
|
*/
|
|
static char ExtraOptions[MAXPGPATH];
|
|
|
|
/*
|
|
* These globals control the behavior of the postmaster in case some
|
|
* backend dumps core. Normally, it kills all peers of the dead backend
|
|
* and reinitializes shared memory. By specifying -s or -n, we can have
|
|
* the postmaster stop (rather than kill) peers and not reinitialize
|
|
* shared data structures.
|
|
*/
|
|
static bool Reinit = true;
|
|
static int SendStop = false;
|
|
|
|
bool NetServer = false; /* listen on TCP/IP */
|
|
bool EnableSSL = false;
|
|
bool SilentMode = false; /* silent mode (-S) */
|
|
|
|
int CheckPointTimeout = 300;
|
|
|
|
static pid_t StartupPID = 0,
|
|
ShutdownPID = 0,
|
|
CheckPointPID = 0;
|
|
static time_t checkpointed = 0;
|
|
|
|
#define NoShutdown 0
|
|
#define SmartShutdown 1
|
|
#define FastShutdown 2
|
|
|
|
static int Shutdown = NoShutdown;
|
|
|
|
static bool FatalError = false; /* T if recovering from backend crash */
|
|
|
|
/*
|
|
* State for assigning random salts and cancel keys.
|
|
* Also, the global MyCancelKey passes the cancel key assigned to a given
|
|
* backend from the postmaster to that backend (via fork).
|
|
*/
|
|
|
|
static unsigned int random_seed = 0;
|
|
|
|
extern char *optarg;
|
|
extern int optind,
|
|
opterr;
|
|
#ifdef HAVE_INT_OPTRESET
|
|
extern int optreset;
|
|
#endif
|
|
|
|
/*
|
|
* postmaster.c - function prototypes
|
|
*/
|
|
static void pmdaemonize(int argc, char *argv[]);
|
|
static Port *ConnCreate(int serverFd);
|
|
static void ConnFree(Port *port);
|
|
static void ClosePostmasterPorts(Port *myConn);
|
|
static void reset_shared(unsigned short port);
|
|
static void SIGHUP_handler(SIGNAL_ARGS);
|
|
static void pmdie(SIGNAL_ARGS);
|
|
static void reaper(SIGNAL_ARGS);
|
|
static void schedule_checkpoint(SIGNAL_ARGS);
|
|
static void dumpstatus(SIGNAL_ARGS);
|
|
static void CleanupProc(int pid, int exitstatus);
|
|
static int DoBackend(Port *port);
|
|
static void ExitPostmaster(int status);
|
|
static void usage(const char *);
|
|
static int ServerLoop(void);
|
|
static int BackendStartup(Port *port);
|
|
static int readStartupPacket(void *arg, PacketLen len, void *pkt);
|
|
static int processCancelRequest(Port *port, PacketLen len, void *pkt);
|
|
static int initMasks(fd_set *rmask, fd_set *wmask);
|
|
static char *canAcceptConnections(void);
|
|
static long PostmasterRandom(void);
|
|
static void RandomSalt(char *salt);
|
|
static void SignalChildren(int signal);
|
|
static int CountChildren(void);
|
|
static bool CreateOptsFile(int argc, char *argv[]);
|
|
static void postmaster_error(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
|
|
|
|
static pid_t SSDataBase(int xlop);
|
|
|
|
#define StartupDataBase() SSDataBase(BS_XLOG_STARTUP)
|
|
#define CheckPointDataBase() SSDataBase(BS_XLOG_CHECKPOINT)
|
|
#define ShutdownDataBase() SSDataBase(BS_XLOG_SHUTDOWN)
|
|
|
|
#ifdef USE_SSL
|
|
static void InitSSL(void);
|
|
|
|
#endif
|
|
|
|
|
|
static void
|
|
checkDataDir(const char *checkdir)
|
|
{
|
|
char path[MAXPGPATH];
|
|
FILE *fp;
|
|
|
|
if (checkdir == NULL)
|
|
{
|
|
fprintf(stderr, gettext(
|
|
"%s does not know where to find the database system data.\n"
|
|
"You must specify the directory that contains the database system\n"
|
|
"either by specifying the -D invocation option or by setting the\n"
|
|
"PGDATA environment variable.\n\n"),
|
|
progname);
|
|
ExitPostmaster(2);
|
|
}
|
|
|
|
snprintf(path, sizeof(path), "%s/global/pg_control", checkdir);
|
|
|
|
fp = AllocateFile(path, PG_BINARY_R);
|
|
if (fp == NULL)
|
|
{
|
|
fprintf(stderr, gettext(
|
|
"%s does not find the database system.\n"
|
|
"Expected to find it in the PGDATA directory \"%s\",\n"
|
|
"but unable to open file \"%s\": %s\n\n"),
|
|
progname, checkdir, path, strerror(errno));
|
|
ExitPostmaster(2);
|
|
}
|
|
|
|
FreeFile(fp);
|
|
|
|
ValidatePgVersion(checkdir);
|
|
}
|
|
|
|
|
|
int
|
|
PostmasterMain(int argc, char *argv[])
|
|
{
|
|
int opt;
|
|
int status;
|
|
char original_extraoptions[MAXPGPATH];
|
|
char *potential_DataDir = NULL;
|
|
|
|
IsUnderPostmaster = true; /* so that backends know this */
|
|
|
|
*original_extraoptions = '\0';
|
|
|
|
progname = argv[0];
|
|
real_argv = argv;
|
|
real_argc = argc;
|
|
|
|
/*
|
|
* Catch standard options before doing much else. This even works on
|
|
* systems without getopt_long.
|
|
*/
|
|
if (argc > 1)
|
|
{
|
|
if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
|
|
{
|
|
usage(progname);
|
|
ExitPostmaster(0);
|
|
}
|
|
if (strcmp(argv[1], "--version") == 0 || strcmp(argv[1], "-V") == 0)
|
|
{
|
|
puts("postmaster (PostgreSQL) " PG_VERSION);
|
|
ExitPostmaster(0);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* for security, no dir or file created can be group or other
|
|
* accessible
|
|
*/
|
|
umask((mode_t) 0077);
|
|
|
|
MyProcPid = getpid();
|
|
|
|
/*
|
|
* Fire up essential subsystems: error and memory management
|
|
*/
|
|
EnableExceptionHandling(true);
|
|
MemoryContextInit();
|
|
|
|
/*
|
|
* By default, palloc() requests in the postmaster will be allocated
|
|
* in the PostmasterContext, which is space that can be recycled by
|
|
* backends. Allocated data that needs to be available to backends
|
|
* should be allocated in TopMemoryContext.
|
|
*/
|
|
PostmasterContext = AllocSetContextCreate(TopMemoryContext,
|
|
"Postmaster",
|
|
ALLOCSET_DEFAULT_MINSIZE,
|
|
ALLOCSET_DEFAULT_INITSIZE,
|
|
ALLOCSET_DEFAULT_MAXSIZE);
|
|
MemoryContextSwitchTo(PostmasterContext);
|
|
|
|
/*
|
|
* Options setup
|
|
*/
|
|
potential_DataDir = getenv("PGDATA"); /* default value */
|
|
|
|
ResetAllOptions();
|
|
|
|
/*
|
|
* First we must scan for a -D argument to get the data dir. Then read
|
|
* the config file. Finally, scan all the other arguments. (Command
|
|
* line switches override config file.)
|
|
*
|
|
* Note: The two lists of options must be exactly the same, even though
|
|
* perhaps the first one would only have to be "D:" with opterr turned
|
|
* off. But some versions of getopt (notably GNU) are going to
|
|
* arbitrarily permute some "non-options" (according to the local
|
|
* world view) which will result in some switches being associated
|
|
* with the wrong argument. Death and destruction will occur.
|
|
*/
|
|
opterr = 1;
|
|
while ((opt = getopt(argc, argv, "A:a:B:b:c:D:d:Fh:ik:lm:MN:no:p:Ss-:")) != EOF)
|
|
{
|
|
switch (opt)
|
|
{
|
|
case 'D':
|
|
potential_DataDir = optarg;
|
|
break;
|
|
|
|
case '?':
|
|
fprintf(stderr, gettext("Try '%s --help' for more information.\n"), progname);
|
|
ExitPostmaster(1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Non-option switch arguments don't exist.
|
|
*/
|
|
if (optind < argc)
|
|
{
|
|
postmaster_error("invalid argument -- %s", argv[optind]);
|
|
fprintf(stderr, gettext("Try '%s --help' for more information.\n"), progname);
|
|
ExitPostmaster(1);
|
|
}
|
|
|
|
checkDataDir(potential_DataDir); /* issues error messages */
|
|
SetDataDir(potential_DataDir);
|
|
|
|
ProcessConfigFile(PGC_POSTMASTER);
|
|
|
|
IgnoreSystemIndexes(false);
|
|
|
|
optind = 1; /* start over */
|
|
#ifdef HAVE_INT_OPTRESET
|
|
optreset = 1;
|
|
#endif
|
|
while ((opt = getopt(argc, argv, "A:a:B:b:c:D:d:Fh:ik:lm:MN:no:p:Ss-:")) != EOF)
|
|
{
|
|
switch (opt)
|
|
{
|
|
case 'A':
|
|
#ifndef USE_ASSERT_CHECKING
|
|
postmaster_error("Assert checking is not compiled in.");
|
|
#else
|
|
assert_enabled = atoi(optarg);
|
|
#endif
|
|
break;
|
|
case 'a':
|
|
/* Can no longer set authentication method. */
|
|
break;
|
|
case 'B':
|
|
NBuffers = atoi(optarg);
|
|
break;
|
|
case 'b':
|
|
/* Can no longer set the backend executable file to use. */
|
|
break;
|
|
case 'D':
|
|
/* already done above */
|
|
break;
|
|
case 'd':
|
|
|
|
/*
|
|
* Turn on debugging for the postmaster and the backend
|
|
* servers descended from it.
|
|
*/
|
|
DebugLvl = atoi(optarg);
|
|
break;
|
|
case 'F':
|
|
enableFsync = false;
|
|
break;
|
|
case 'h':
|
|
VirtualHost = optarg;
|
|
break;
|
|
case 'i':
|
|
NetServer = true;
|
|
break;
|
|
case 'k':
|
|
UnixSocketDir = optarg;
|
|
break;
|
|
#ifdef USE_SSL
|
|
case 'l':
|
|
EnableSSL = true;
|
|
break;
|
|
#endif
|
|
case 'm':
|
|
/* Multiplexed backends no longer supported. */
|
|
break;
|
|
case 'M':
|
|
|
|
/*
|
|
* ignore this flag. This may be passed in because the
|
|
* program was run as 'postgres -M' instead of
|
|
* 'postmaster'
|
|
*/
|
|
break;
|
|
case 'N':
|
|
|
|
/*
|
|
* The max number of backends to start. Can't set to less
|
|
* than 1 or more than compiled-in limit.
|
|
*/
|
|
MaxBackends = atoi(optarg);
|
|
if (MaxBackends < 1)
|
|
MaxBackends = 1;
|
|
if (MaxBackends > MAXBACKENDS)
|
|
MaxBackends = MAXBACKENDS;
|
|
break;
|
|
case 'n':
|
|
/* Don't reinit shared mem after abnormal exit */
|
|
Reinit = false;
|
|
break;
|
|
case 'o':
|
|
|
|
/*
|
|
* Other options to pass to the backend on the command
|
|
* line -- useful only for debugging.
|
|
*/
|
|
strcat(ExtraOptions, " ");
|
|
strcat(ExtraOptions, optarg);
|
|
strcpy(original_extraoptions, optarg);
|
|
break;
|
|
case 'p':
|
|
PostPortNumber = atoi(optarg);
|
|
break;
|
|
case 'S':
|
|
|
|
/*
|
|
* Start in 'S'ilent mode (disassociate from controlling
|
|
* tty). You may also think of this as 'S'ysV mode since
|
|
* it's most badly needed on SysV-derived systems like
|
|
* SVR4 and HP-UX.
|
|
*/
|
|
SilentMode = true;
|
|
break;
|
|
case 's':
|
|
|
|
/*
|
|
* In the event that some backend dumps core, send
|
|
* SIGSTOP, rather than SIGQUIT, to all its peers. This
|
|
* lets the wily post_hacker collect core dumps from
|
|
* everyone.
|
|
*/
|
|
SendStop = true;
|
|
break;
|
|
case 'c':
|
|
case '-':
|
|
{
|
|
char *name,
|
|
*value;
|
|
|
|
ParseLongOption(optarg, &name, &value);
|
|
if (!value)
|
|
{
|
|
if (opt == '-')
|
|
elog(ERROR, "--%s requires argument", optarg);
|
|
else
|
|
elog(ERROR, "-c %s requires argument", optarg);
|
|
}
|
|
|
|
SetConfigOption(name, value, PGC_POSTMASTER);
|
|
free(name);
|
|
if (value)
|
|
free(value);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
/* shouldn't get here */
|
|
fprintf(stderr, gettext("Try '%s --help' for more information.\n"), progname);
|
|
ExitPostmaster(1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check for invalid combinations of switches
|
|
*/
|
|
if (NBuffers < 2 * MaxBackends || NBuffers < 16)
|
|
{
|
|
|
|
/*
|
|
* Do not accept -B so small that backends are likely to starve
|
|
* for lack of buffers. The specific choices here are somewhat
|
|
* arbitrary.
|
|
*/
|
|
postmaster_error("The number of buffers (-B) must be at least twice the number of allowed connections (-N) and at least 16.");
|
|
ExitPostmaster(1);
|
|
}
|
|
|
|
if (DebugLvl > 2)
|
|
{
|
|
extern char **environ;
|
|
char **p;
|
|
|
|
fprintf(stderr, "%s: PostmasterMain: initial environ dump:\n",
|
|
progname);
|
|
fprintf(stderr, "-----------------------------------------\n");
|
|
for (p = environ; *p; ++p)
|
|
fprintf(stderr, "\t%s\n", *p);
|
|
fprintf(stderr, "-----------------------------------------\n");
|
|
}
|
|
|
|
/*
|
|
* Fork away from controlling terminal, if -S specified.
|
|
*
|
|
* Must do this before we grab any interlock files, else the interlocks
|
|
* will show the wrong PID.
|
|
*/
|
|
if (SilentMode)
|
|
pmdaemonize(argc, argv);
|
|
|
|
/*
|
|
* Create lockfile for data directory.
|
|
*
|
|
* We want to do this before we try to grab the input sockets, because
|
|
* the data directory interlock is more reliable than the socket-file
|
|
* interlock (thanks to whoever decided to put socket files in /tmp
|
|
* :-(). For the same reason, it's best to grab the TCP socket before
|
|
* the Unix socket.
|
|
*/
|
|
if (!CreateDataDirLockFile(DataDir, true))
|
|
ExitPostmaster(1);
|
|
|
|
/*
|
|
* Establish input sockets.
|
|
*/
|
|
#ifdef USE_SSL
|
|
if (EnableSSL && !NetServer)
|
|
{
|
|
postmaster_error("For SSL, TCP/IP connections must be enabled.");
|
|
fprintf(stderr, gettext("Try '%s --help' for more information.\n"), progname);
|
|
ExitPostmaster(1);
|
|
}
|
|
if (EnableSSL)
|
|
InitSSL();
|
|
#endif
|
|
|
|
if (NetServer)
|
|
{
|
|
status = StreamServerPort(AF_INET, VirtualHost,
|
|
(unsigned short) PostPortNumber, UnixSocketDir,
|
|
&ServerSock_INET);
|
|
if (status != STATUS_OK)
|
|
{
|
|
postmaster_error("cannot create INET stream port");
|
|
ExitPostmaster(1);
|
|
}
|
|
}
|
|
|
|
#ifdef HAVE_UNIX_SOCKETS
|
|
status = StreamServerPort(AF_UNIX, VirtualHost,
|
|
(unsigned short) PostPortNumber, UnixSocketDir,
|
|
&ServerSock_UNIX);
|
|
if (status != STATUS_OK)
|
|
{
|
|
postmaster_error("cannot create UNIX stream port");
|
|
ExitPostmaster(1);
|
|
}
|
|
#endif
|
|
|
|
XLOGPathInit();
|
|
|
|
/*
|
|
* Set up shared memory and semaphores.
|
|
*/
|
|
reset_shared(PostPortNumber);
|
|
|
|
/*
|
|
* Initialize the list of active backends. This list is only used for
|
|
* garbage collecting the backend processes.
|
|
*/
|
|
BackendList = DLNewList();
|
|
PortList = DLNewList();
|
|
|
|
/*
|
|
* Record postmaster options. We delay this till now to avoid
|
|
* recording bogus options (eg, NBuffers too high for available
|
|
* memory).
|
|
*/
|
|
if (!CreateOptsFile(argc, argv))
|
|
ExitPostmaster(1);
|
|
|
|
/*
|
|
* Set up signal handlers for the postmaster process.
|
|
*/
|
|
pqinitmask();
|
|
PG_SETMASK(&BlockSig);
|
|
|
|
pqsignal(SIGHUP, SIGHUP_handler); /* reread config file and have
|
|
* children do same */
|
|
pqsignal(SIGINT, pmdie); /* send SIGTERM and ShutdownDataBase */
|
|
pqsignal(SIGQUIT, pmdie); /* send SIGQUIT and die */
|
|
pqsignal(SIGTERM, pmdie); /* wait for children and ShutdownDataBase */
|
|
pqsignal(SIGALRM, SIG_IGN); /* ignored */
|
|
pqsignal(SIGPIPE, SIG_IGN); /* ignored */
|
|
pqsignal(SIGUSR1, schedule_checkpoint); /* start a background
|
|
* checkpoint */
|
|
pqsignal(SIGUSR2, pmdie); /* send SIGUSR2, don't die */
|
|
pqsignal(SIGCHLD, reaper); /* handle child termination */
|
|
pqsignal(SIGTTIN, SIG_IGN); /* ignored */
|
|
pqsignal(SIGTTOU, SIG_IGN); /* ignored */
|
|
pqsignal(SIGWINCH, dumpstatus); /* dump port status */
|
|
|
|
/*
|
|
* We're ready to rock and roll...
|
|
*/
|
|
StartupPID = StartupDataBase();
|
|
|
|
status = ServerLoop();
|
|
|
|
/*
|
|
* ServerLoop probably shouldn't ever return, but if it does, close
|
|
* down.
|
|
*/
|
|
ExitPostmaster(status != STATUS_OK);
|
|
|
|
return 0; /* not reached */
|
|
}
|
|
|
|
static void
|
|
pmdaemonize(int argc, char *argv[])
|
|
{
|
|
int i;
|
|
pid_t pid;
|
|
|
|
pid = fork();
|
|
if (pid == (pid_t) -1)
|
|
{
|
|
postmaster_error("fork failed: %s", strerror(errno));
|
|
ExitPostmaster(1);
|
|
return; /* not reached */
|
|
}
|
|
else if (pid)
|
|
{ /* parent */
|
|
/* Parent should just exit, without doing any atexit cleanup */
|
|
_exit(0);
|
|
}
|
|
|
|
MyProcPid = getpid(); /* reset MyProcPid to child */
|
|
|
|
/* GH: If there's no setsid(), we hopefully don't need silent mode.
|
|
* Until there's a better solution.
|
|
*/
|
|
#ifdef HAVE_SETSID
|
|
if (setsid() < 0)
|
|
{
|
|
postmaster_error("cannot disassociate from controlling TTY: %s",
|
|
strerror(errno));
|
|
ExitPostmaster(1);
|
|
}
|
|
#endif
|
|
i = open(NULL_DEV, O_RDWR | PG_BINARY);
|
|
dup2(i, 0);
|
|
dup2(i, 1);
|
|
dup2(i, 2);
|
|
close(i);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Print out help message
|
|
*/
|
|
static void
|
|
usage(const char *progname)
|
|
{
|
|
printf(gettext("%s is the PostgreSQL server.\n\n"), progname);
|
|
printf(gettext("Usage:\n %s [options...]\n\n"), progname);
|
|
printf(gettext("Options:\n"));
|
|
#ifdef USE_ASSERT_CHECKING
|
|
printf(gettext(" -A 1|0 enable/disable run-time assert checking\n"));
|
|
#endif
|
|
printf(gettext(" -B NBUFFERS number of shared buffers (default %d)\n"), DEF_NBUFFERS);
|
|
printf(gettext(" -c NAME=VALUE set run-time parameter\n"));
|
|
printf(gettext(" -d 1-5 debugging level\n"));
|
|
printf(gettext(" -D DATADIR database directory\n"));
|
|
printf(gettext(" -F turn fsync off\n"));
|
|
printf(gettext(" -h HOSTNAME host name or IP address to listen on\n"));
|
|
printf(gettext(" -i enable TCP/IP connections\n"));
|
|
printf(gettext(" -k DIRECTORY Unix-domain socket location\n"));
|
|
#ifdef USE_SSL
|
|
printf(gettext(" -l enable SSL connections\n"));
|
|
#endif
|
|
printf(gettext(" -N MAX-CONNECT maximum number of allowed connections (1..%d, default %d)\n"),
|
|
MAXBACKENDS, DEF_MAXBACKENDS);
|
|
printf(gettext(" -o OPTIONS pass 'OPTIONS' to each backend server\n"));
|
|
printf(gettext(" -p PORT port number to listen on (default %d)\n"), DEF_PGPORT);
|
|
printf(gettext(" -S silent mode (start in background without logging output)\n"));
|
|
|
|
printf(gettext("\nDeveloper options:\n"));
|
|
printf(gettext(" -n do not reinitialize shared memory after abnormal exit\n"));
|
|
printf(gettext(" -s send SIGSTOP to all backend servers if one dies\n"));
|
|
|
|
printf(gettext("\nPlease read the documentation for the complete list of run-time\n"
|
|
"configuration settings and how to set them on the command line or in\n"
|
|
"the configuration file.\n\n"
|
|
"Report bugs to <pgsql-bugs@postgresql.org>.\n"));
|
|
}
|
|
|
|
static int
|
|
ServerLoop(void)
|
|
{
|
|
fd_set readmask,
|
|
writemask;
|
|
int nSockets;
|
|
Dlelem *curr;
|
|
struct timeval now,
|
|
later;
|
|
struct timezone tz;
|
|
|
|
gettimeofday(&now, &tz);
|
|
|
|
nSockets = initMasks(&readmask, &writemask);
|
|
|
|
for (;;)
|
|
{
|
|
Port *port;
|
|
fd_set rmask,
|
|
wmask;
|
|
struct timeval *timeout = NULL;
|
|
struct timeval timeout_tv;
|
|
|
|
if (CheckPointPID == 0 && checkpointed &&
|
|
Shutdown == NoShutdown && !FatalError)
|
|
{
|
|
time_t now = time(NULL);
|
|
|
|
if (CheckPointTimeout + checkpointed > now)
|
|
{
|
|
|
|
/*
|
|
* Not time for checkpoint yet, so set a timeout for
|
|
* select
|
|
*/
|
|
timeout_tv.tv_sec = CheckPointTimeout + checkpointed - now;
|
|
timeout_tv.tv_usec = 0;
|
|
timeout = &timeout_tv;
|
|
}
|
|
else
|
|
{
|
|
/* Time to make the checkpoint... */
|
|
CheckPointPID = CheckPointDataBase();
|
|
|
|
/*
|
|
* if fork failed, schedule another try at 0.1 normal
|
|
* delay
|
|
*/
|
|
if (CheckPointPID == 0)
|
|
checkpointed = now - (9 * CheckPointTimeout) / 10;
|
|
}
|
|
}
|
|
|
|
#ifdef USE_SSL
|
|
|
|
/*
|
|
* If we are using SSL, there may be input data already read and
|
|
* pending in SSL's input buffers. If so, check for additional
|
|
* input from other clients, but don't delay before processing.
|
|
*/
|
|
for (curr = DLGetHead(PortList); curr; curr = DLGetSucc(curr))
|
|
{
|
|
Port *port = (Port *) DLE_VAL(curr);
|
|
|
|
if (port->ssl && SSL_pending(port->ssl))
|
|
{
|
|
timeout_tv.tv_sec = 0;
|
|
timeout_tv.tv_usec = 0;
|
|
timeout = &timeout_tv;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Wait for something to happen.
|
|
*/
|
|
memcpy((char *) &rmask, (char *) &readmask, sizeof(fd_set));
|
|
memcpy((char *) &wmask, (char *) &writemask, sizeof(fd_set));
|
|
|
|
PG_SETMASK(&UnBlockSig);
|
|
|
|
if (select(nSockets, &rmask, &wmask, (fd_set *) NULL, timeout) < 0)
|
|
{
|
|
PG_SETMASK(&BlockSig);
|
|
if (errno == EINTR || errno == EWOULDBLOCK)
|
|
continue;
|
|
postmaster_error("ServerLoop: select failed: %s", strerror(errno));
|
|
return STATUS_ERROR;
|
|
}
|
|
|
|
/*
|
|
* Block all signals until we wait again
|
|
*/
|
|
PG_SETMASK(&BlockSig);
|
|
|
|
/*
|
|
* Respond to signals, if needed
|
|
*/
|
|
if (got_SIGHUP)
|
|
{
|
|
got_SIGHUP = false;
|
|
ProcessConfigFile(PGC_SIGHUP);
|
|
}
|
|
|
|
/*
|
|
* Select a random seed at the time of first receiving a request.
|
|
*/
|
|
while (random_seed == 0)
|
|
{
|
|
gettimeofday(&later, &tz);
|
|
|
|
/*
|
|
* We are not sure how much precision is in tv_usec, so we
|
|
* swap the nibbles of 'later' and XOR them with 'now'. On the
|
|
* off chance that the result is 0, we loop until it isn't.
|
|
*/
|
|
random_seed = now.tv_usec ^
|
|
((later.tv_usec << 16) |
|
|
((later.tv_usec >> 16) & 0xffff));
|
|
}
|
|
|
|
/*
|
|
* new connection pending on our well-known port's socket?
|
|
*/
|
|
|
|
#ifdef HAVE_UNIX_SOCKETS
|
|
if (ServerSock_UNIX != INVALID_SOCK &&
|
|
FD_ISSET(ServerSock_UNIX, &rmask) &&
|
|
(port = ConnCreate(ServerSock_UNIX)) != NULL)
|
|
{
|
|
PacketReceiveSetup(&port->pktInfo,
|
|
readStartupPacket,
|
|
(void *) port);
|
|
}
|
|
#endif
|
|
|
|
if (ServerSock_INET != INVALID_SOCK &&
|
|
FD_ISSET(ServerSock_INET, &rmask) &&
|
|
(port = ConnCreate(ServerSock_INET)) != NULL)
|
|
{
|
|
PacketReceiveSetup(&port->pktInfo,
|
|
readStartupPacket,
|
|
(void *) port);
|
|
}
|
|
|
|
/*
|
|
* Scan active ports, processing any available input. While we
|
|
* are at it, build up new masks for next select().
|
|
*/
|
|
nSockets = initMasks(&readmask, &writemask);
|
|
|
|
curr = DLGetHead(PortList);
|
|
|
|
while (curr)
|
|
{
|
|
Port *port = (Port *) DLE_VAL(curr);
|
|
int status = STATUS_OK;
|
|
Dlelem *next;
|
|
|
|
if (FD_ISSET(port->sock, &rmask)
|
|
#ifdef USE_SSL
|
|
|| (port->ssl && SSL_pending(port->ssl))
|
|
#endif
|
|
)
|
|
{
|
|
if (DebugLvl > 1)
|
|
postmaster_error("ServerLoop: handling reading %d", port->sock);
|
|
|
|
if (PacketReceiveFragment(port) != STATUS_OK)
|
|
status = STATUS_ERROR;
|
|
}
|
|
|
|
if (FD_ISSET(port->sock, &wmask))
|
|
{
|
|
if (DebugLvl > 1)
|
|
postmaster_error("ServerLoop: handling writing %d", port->sock);
|
|
|
|
if (PacketSendFragment(port) != STATUS_OK)
|
|
status = STATUS_ERROR;
|
|
}
|
|
|
|
/* Get this before the connection might be closed. */
|
|
|
|
next = DLGetSucc(curr);
|
|
|
|
/*
|
|
* If there is no error and no outstanding data transfer going
|
|
* on, then the authentication handshake must be complete to
|
|
* the postmaster's satisfaction. So, start the backend.
|
|
*/
|
|
|
|
if (status == STATUS_OK && port->pktInfo.state == Idle)
|
|
{
|
|
|
|
/*
|
|
* Can we accept a connection now?
|
|
*
|
|
* Even though readStartupPacket() already checked, we have
|
|
* to check again in case conditions changed while
|
|
* negotiating authentication.
|
|
*/
|
|
char *rejectMsg = canAcceptConnections();
|
|
|
|
if (rejectMsg != NULL)
|
|
PacketSendError(&port->pktInfo, rejectMsg);
|
|
else
|
|
{
|
|
|
|
/*
|
|
* If the backend start fails then keep the connection
|
|
* open to report it. Otherwise, pretend there is an
|
|
* error to close our descriptor for the connection,
|
|
* which will now be managed by the backend.
|
|
*/
|
|
if (BackendStartup(port) != STATUS_OK)
|
|
PacketSendError(&port->pktInfo,
|
|
"Backend startup failed");
|
|
else
|
|
status = STATUS_ERROR;
|
|
}
|
|
}
|
|
|
|
/* Close the connection if required. */
|
|
|
|
if (status != STATUS_OK)
|
|
{
|
|
StreamClose(port->sock);
|
|
DLRemove(curr);
|
|
ConnFree(port);
|
|
DLFreeElem(curr);
|
|
}
|
|
else
|
|
{
|
|
/* Set the masks for this connection. */
|
|
|
|
if (nSockets <= port->sock)
|
|
nSockets = port->sock + 1;
|
|
|
|
if (port->pktInfo.state == WritingPacket)
|
|
FD_SET(port->sock, &writemask);
|
|
else
|
|
FD_SET(port->sock, &readmask);
|
|
}
|
|
|
|
curr = next;
|
|
} /* loop over active ports */
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Initialise the read and write masks for select() for the well-known ports
|
|
* we are listening on. Return the number of sockets to listen on.
|
|
*/
|
|
|
|
static int
|
|
initMasks(fd_set *rmask, fd_set *wmask)
|
|
{
|
|
int nsocks = -1;
|
|
|
|
FD_ZERO(rmask);
|
|
FD_ZERO(wmask);
|
|
|
|
#ifdef HAVE_UNIX_SOCKETS
|
|
if (ServerSock_UNIX != INVALID_SOCK)
|
|
{
|
|
FD_SET(ServerSock_UNIX, rmask);
|
|
|
|
if (ServerSock_UNIX > nsocks)
|
|
nsocks = ServerSock_UNIX;
|
|
}
|
|
#endif
|
|
|
|
if (ServerSock_INET != INVALID_SOCK)
|
|
{
|
|
FD_SET(ServerSock_INET, rmask);
|
|
if (ServerSock_INET > nsocks)
|
|
nsocks = ServerSock_INET;
|
|
}
|
|
|
|
return nsocks + 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* Called when the startup packet has been read.
|
|
*/
|
|
|
|
static int
|
|
readStartupPacket(void *arg, PacketLen len, void *pkt)
|
|
{
|
|
Port *port;
|
|
StartupPacket *si;
|
|
char *rejectMsg;
|
|
|
|
port = (Port *) arg;
|
|
si = (StartupPacket *) pkt;
|
|
|
|
/*
|
|
* The first field is either a protocol version number or a special
|
|
* request code.
|
|
*/
|
|
|
|
port->proto = ntohl(si->protoVersion);
|
|
|
|
if (port->proto == CANCEL_REQUEST_CODE)
|
|
return processCancelRequest(port, len, pkt);
|
|
|
|
if (port->proto == NEGOTIATE_SSL_CODE)
|
|
{
|
|
char SSLok;
|
|
|
|
#ifdef USE_SSL
|
|
/* No SSL when disabled or on Unix sockets */
|
|
if (!EnableSSL || port->laddr.sa.sa_family != AF_INET)
|
|
SSLok = 'N';
|
|
else
|
|
SSLok = 'S'; /* Support for SSL */
|
|
#else
|
|
SSLok = 'N'; /* No support for SSL */
|
|
#endif
|
|
if (send(port->sock, &SSLok, 1, 0) != 1)
|
|
{
|
|
postmaster_error("failed to send SSL negotiation response: %s",
|
|
strerror(errno));
|
|
return STATUS_ERROR;/* Close connection */
|
|
}
|
|
|
|
#ifdef USE_SSL
|
|
if (SSLok == 'S')
|
|
{
|
|
if (!(port->ssl = SSL_new(SSL_context)) ||
|
|
!SSL_set_fd(port->ssl, port->sock) ||
|
|
SSL_accept(port->ssl) <= 0)
|
|
{
|
|
postmaster_error("failed to initialize SSL connection: %s, errno: %d (%s)",
|
|
ERR_reason_error_string(ERR_get_error()), errno, strerror(errno));
|
|
return STATUS_ERROR;
|
|
}
|
|
}
|
|
#endif
|
|
/* ready for the normal startup packet */
|
|
PacketReceiveSetup(&port->pktInfo,
|
|
readStartupPacket,
|
|
(void *) port);
|
|
return STATUS_OK; /* Do not close connection */
|
|
}
|
|
|
|
/* Could add additional special packet types here */
|
|
|
|
|
|
/* Check we can handle the protocol the frontend is using. */
|
|
|
|
if (PG_PROTOCOL_MAJOR(port->proto) < PG_PROTOCOL_MAJOR(PG_PROTOCOL_EARLIEST) ||
|
|
PG_PROTOCOL_MAJOR(port->proto) > PG_PROTOCOL_MAJOR(PG_PROTOCOL_LATEST) ||
|
|
(PG_PROTOCOL_MAJOR(port->proto) == PG_PROTOCOL_MAJOR(PG_PROTOCOL_LATEST) &&
|
|
PG_PROTOCOL_MINOR(port->proto) > PG_PROTOCOL_MINOR(PG_PROTOCOL_LATEST)))
|
|
{
|
|
PacketSendError(&port->pktInfo, "Unsupported frontend protocol.");
|
|
return STATUS_OK; /* don't close the connection yet */
|
|
}
|
|
|
|
/*
|
|
* Get the parameters from the startup packet as C strings. The
|
|
* packet destination was cleared first so a short packet has zeros
|
|
* silently added and a long packet is silently truncated.
|
|
*/
|
|
|
|
StrNCpy(port->database, si->database, sizeof(port->database));
|
|
StrNCpy(port->user, si->user, sizeof(port->user));
|
|
StrNCpy(port->options, si->options, sizeof(port->options));
|
|
StrNCpy(port->tty, si->tty, sizeof(port->tty));
|
|
|
|
/* The database defaults to the user name. */
|
|
|
|
if (port->database[0] == '\0')
|
|
StrNCpy(port->database, si->user, sizeof(port->database));
|
|
|
|
/*
|
|
* Truncate given database and user names to length of a Postgres
|
|
* name.
|
|
*/
|
|
/* This avoids lookup failures when overlength names are given. */
|
|
|
|
if ((int) sizeof(port->database) >= NAMEDATALEN)
|
|
port->database[NAMEDATALEN - 1] = '\0';
|
|
if ((int) sizeof(port->user) >= NAMEDATALEN)
|
|
port->user[NAMEDATALEN - 1] = '\0';
|
|
|
|
/* Check a user name was given. */
|
|
|
|
if (port->user[0] == '\0')
|
|
{
|
|
PacketSendError(&port->pktInfo,
|
|
"No Postgres username specified in startup packet.");
|
|
return STATUS_OK; /* don't close the connection yet */
|
|
}
|
|
|
|
/*
|
|
* If we're going to reject the connection due to database state, say
|
|
* so now instead of wasting cycles on an authentication exchange.
|
|
* (This also allows a pg_ping utility to be written.)
|
|
*/
|
|
rejectMsg = canAcceptConnections();
|
|
|
|
if (rejectMsg != NULL)
|
|
{
|
|
PacketSendError(&port->pktInfo, rejectMsg);
|
|
return STATUS_OK; /* don't close the connection yet */
|
|
}
|
|
|
|
/* Start the authentication itself. */
|
|
|
|
be_recvauth(port);
|
|
|
|
return STATUS_OK; /* don't close the connection yet */
|
|
}
|
|
|
|
/*
|
|
* The client has sent a cancel request packet, not a normal
|
|
* start-a-new-backend packet. Perform the necessary processing.
|
|
* Note that in any case, we return STATUS_ERROR to close the
|
|
* connection immediately. Nothing is sent back to the client.
|
|
*/
|
|
|
|
static int
|
|
processCancelRequest(Port *port, PacketLen len, void *pkt)
|
|
{
|
|
CancelRequestPacket *canc = (CancelRequestPacket *) pkt;
|
|
int backendPID;
|
|
long cancelAuthCode;
|
|
Dlelem *curr;
|
|
Backend *bp;
|
|
|
|
backendPID = (int) ntohl(canc->backendPID);
|
|
cancelAuthCode = (long) ntohl(canc->cancelAuthCode);
|
|
|
|
if (backendPID == CheckPointPID)
|
|
{
|
|
if (DebugLvl)
|
|
postmaster_error("processCancelRequest: CheckPointPID in cancel request for process %d", backendPID);
|
|
return STATUS_ERROR;
|
|
}
|
|
|
|
/* See if we have a matching backend */
|
|
|
|
for (curr = DLGetHead(BackendList); curr; curr = DLGetSucc(curr))
|
|
{
|
|
bp = (Backend *) DLE_VAL(curr);
|
|
if (bp->pid == backendPID)
|
|
{
|
|
if (bp->cancel_key == cancelAuthCode)
|
|
{
|
|
/* Found a match; signal that backend to cancel current op */
|
|
if (DebugLvl)
|
|
postmaster_error("processCancelRequest: sending SIGINT to process %d", bp->pid);
|
|
kill(bp->pid, SIGINT);
|
|
}
|
|
else
|
|
{
|
|
/* Right PID, wrong key: no way, Jose */
|
|
if (DebugLvl)
|
|
postmaster_error("processCancelRequest: bad key in cancel request for process %d", bp->pid);
|
|
}
|
|
return STATUS_ERROR;
|
|
}
|
|
}
|
|
|
|
/* No matching backend */
|
|
if (DebugLvl)
|
|
postmaster_error("processCancelRequest: bad PID in cancel request for process %d", backendPID);
|
|
|
|
return STATUS_ERROR;
|
|
}
|
|
|
|
/*
|
|
* canAcceptConnections --- check to see if database state allows connections.
|
|
*
|
|
* If we are open for business, return NULL, otherwise return an error message
|
|
* string suitable for rejecting a connection request.
|
|
*/
|
|
static char *
|
|
canAcceptConnections(void)
|
|
{
|
|
/* Can't start backends when in startup/shutdown/recovery state. */
|
|
if (Shutdown > NoShutdown)
|
|
return "The Data Base System is shutting down";
|
|
if (StartupPID)
|
|
return "The Data Base System is starting up";
|
|
if (FatalError)
|
|
return "The Data Base System is in recovery mode";
|
|
/* Can't start backend if max backend count is exceeded. */
|
|
if (CountChildren() >= MaxBackends)
|
|
return "Sorry, too many clients already";
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* ConnCreate -- create a local connection data structure
|
|
*/
|
|
static Port *
|
|
ConnCreate(int serverFd)
|
|
{
|
|
Port *port;
|
|
|
|
if (!(port = (Port *) calloc(1, sizeof(Port))))
|
|
{
|
|
postmaster_error("ConnCreate: malloc failed");
|
|
SignalChildren(SIGQUIT);
|
|
ExitPostmaster(1);
|
|
}
|
|
|
|
if (StreamConnection(serverFd, port) != STATUS_OK)
|
|
{
|
|
StreamClose(port->sock);
|
|
ConnFree(port);
|
|
port = NULL;
|
|
}
|
|
else
|
|
{
|
|
DLAddHead(PortList, DLNewElem(port));
|
|
RandomSalt(port->salt);
|
|
port->pktInfo.state = Idle;
|
|
}
|
|
|
|
return port;
|
|
}
|
|
|
|
/*
|
|
* ConnFree -- free a local connection data structure
|
|
*/
|
|
static void
|
|
ConnFree(Port *conn)
|
|
{
|
|
#ifdef USE_SSL
|
|
if (conn->ssl)
|
|
SSL_free(conn->ssl);
|
|
#endif
|
|
free(conn);
|
|
}
|
|
|
|
/*
|
|
* ClosePostmasterPorts -- close all the postmaster's open sockets
|
|
*
|
|
* This is called during child process startup to release file descriptors
|
|
* that are not needed by that child process. All descriptors other than
|
|
* the one for myConn (if it's not null) are closed.
|
|
*
|
|
* Note that closing the child's descriptor does not destroy the client
|
|
* connection prematurely, since the parent (postmaster) process still
|
|
* has the socket open.
|
|
*/
|
|
static void
|
|
ClosePostmasterPorts(Port *myConn)
|
|
{
|
|
Dlelem *curr;
|
|
|
|
/* Close the listen sockets */
|
|
if (NetServer)
|
|
StreamClose(ServerSock_INET);
|
|
ServerSock_INET = INVALID_SOCK;
|
|
#ifdef HAVE_UNIX_SOCKETS
|
|
StreamClose(ServerSock_UNIX);
|
|
ServerSock_UNIX = INVALID_SOCK;
|
|
#endif
|
|
|
|
/* Close any sockets for other clients, and release memory too */
|
|
curr = DLGetHead(PortList);
|
|
|
|
while (curr)
|
|
{
|
|
Port *port = (Port *) DLE_VAL(curr);
|
|
Dlelem *next = DLGetSucc(curr);
|
|
|
|
if (port != myConn)
|
|
{
|
|
StreamClose(port->sock);
|
|
DLRemove(curr);
|
|
ConnFree(port);
|
|
DLFreeElem(curr);
|
|
}
|
|
|
|
curr = next;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* reset_shared -- reset shared memory and semaphores
|
|
*/
|
|
static void
|
|
reset_shared(unsigned short port)
|
|
{
|
|
|
|
/*
|
|
* Reset assignment of shared mem and semaphore IPC keys. Doing this
|
|
* means that in normal cases we'll assign the same keys on each
|
|
* "cycle of life", and thereby avoid leaving dead IPC objects
|
|
* floating around if the postmaster crashes and is restarted.
|
|
*/
|
|
IpcInitKeyAssignment(port);
|
|
|
|
/*
|
|
* Create or re-create shared memory and semaphores.
|
|
*/
|
|
CreateSharedMemoryAndSemaphores(false, MaxBackends);
|
|
}
|
|
|
|
|
|
/*
|
|
* Set flag if SIGHUP was detected so config file can be reread in
|
|
* main loop
|
|
*/
|
|
static void
|
|
SIGHUP_handler(SIGNAL_ARGS)
|
|
{
|
|
int save_errno = errno;
|
|
|
|
if (Shutdown > SmartShutdown)
|
|
return;
|
|
got_SIGHUP = true;
|
|
SignalChildren(SIGHUP);
|
|
errno = save_errno;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* pmdie -- signal handler for processing various postmaster signals.
|
|
*/
|
|
static void
|
|
pmdie(SIGNAL_ARGS)
|
|
{
|
|
int save_errno = errno;
|
|
|
|
PG_SETMASK(&BlockSig);
|
|
|
|
if (DebugLvl >= 1)
|
|
elog(DEBUG, "pmdie %d", postgres_signal_arg);
|
|
|
|
switch (postgres_signal_arg)
|
|
{
|
|
case SIGUSR2:
|
|
|
|
/*
|
|
* Send SIGUSR2 to all children (AsyncNotifyHandler)
|
|
*/
|
|
if (Shutdown > SmartShutdown)
|
|
{
|
|
errno = save_errno;
|
|
return;
|
|
}
|
|
SignalChildren(SIGUSR2);
|
|
errno = save_errno;
|
|
return;
|
|
|
|
case SIGTERM:
|
|
|
|
/*
|
|
* Smart Shutdown:
|
|
*
|
|
* Wait for children to end their work and ShutdownDataBase.
|
|
*/
|
|
if (Shutdown >= SmartShutdown)
|
|
{
|
|
errno = save_errno;
|
|
return;
|
|
}
|
|
Shutdown = SmartShutdown;
|
|
tnow = time(NULL);
|
|
fprintf(stderr, gettext("Smart Shutdown request at %s"), ctime(&tnow));
|
|
fflush(stderr);
|
|
if (DLGetHead(BackendList)) /* let reaper() handle this */
|
|
{
|
|
errno = save_errno;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* No children left. Shutdown data base system.
|
|
*/
|
|
if (StartupPID > 0 || FatalError) /* let reaper() handle
|
|
* this */
|
|
{
|
|
errno = save_errno;
|
|
return;
|
|
}
|
|
if (ShutdownPID > 0)
|
|
abort();
|
|
|
|
ShutdownPID = ShutdownDataBase();
|
|
errno = save_errno;
|
|
return;
|
|
|
|
case SIGINT:
|
|
|
|
/*
|
|
* Fast Shutdown:
|
|
*
|
|
* abort all children with SIGTERM (rollback active transactions
|
|
* and exit) and ShutdownDataBase when they are gone.
|
|
*/
|
|
if (Shutdown >= FastShutdown)
|
|
{
|
|
errno = save_errno;
|
|
return;
|
|
}
|
|
tnow = time(NULL);
|
|
fprintf(stderr, gettext("Fast Shutdown request at %s"), ctime(&tnow));
|
|
fflush(stderr);
|
|
if (DLGetHead(BackendList)) /* let reaper() handle this */
|
|
{
|
|
Shutdown = FastShutdown;
|
|
if (!FatalError)
|
|
{
|
|
fprintf(stderr, gettext("Aborting any active transaction...\n"));
|
|
fflush(stderr);
|
|
SignalChildren(SIGTERM);
|
|
}
|
|
errno = save_errno;
|
|
return;
|
|
}
|
|
if (Shutdown > NoShutdown)
|
|
{
|
|
Shutdown = FastShutdown;
|
|
errno = save_errno;
|
|
return;
|
|
}
|
|
Shutdown = FastShutdown;
|
|
|
|
/*
|
|
* No children left. Shutdown data base system.
|
|
*/
|
|
if (StartupPID > 0 || FatalError) /* let reaper() handle
|
|
* this */
|
|
{
|
|
errno = save_errno;
|
|
return;
|
|
}
|
|
if (ShutdownPID > 0)
|
|
abort();
|
|
|
|
ShutdownPID = ShutdownDataBase();
|
|
errno = save_errno;
|
|
return;
|
|
|
|
case SIGQUIT:
|
|
|
|
/*
|
|
* Immediate Shutdown:
|
|
*
|
|
* abort all children with SIGQUIT and exit without attempt to
|
|
* properly shutdown data base system.
|
|
*/
|
|
tnow = time(NULL);
|
|
fprintf(stderr, gettext("Immediate Shutdown request at %s"), ctime(&tnow));
|
|
fflush(stderr);
|
|
if (ShutdownPID > 0)
|
|
kill(ShutdownPID, SIGQUIT);
|
|
if (StartupPID > 0)
|
|
kill(StartupPID, SIGQUIT);
|
|
if (DLGetHead(BackendList))
|
|
SignalChildren(SIGQUIT);
|
|
break;
|
|
}
|
|
|
|
/* exit postmaster */
|
|
ExitPostmaster(0);
|
|
}
|
|
|
|
/*
|
|
* Reaper -- signal handler to cleanup after a backend (child) dies.
|
|
*/
|
|
static void
|
|
reaper(SIGNAL_ARGS)
|
|
{
|
|
int save_errno = errno;
|
|
|
|
#ifdef HAVE_WAITPID
|
|
int status; /* backend exit status */
|
|
|
|
#else
|
|
union wait status; /* backend exit status */
|
|
|
|
#endif
|
|
int exitstatus;
|
|
int pid; /* process id of dead backend */
|
|
|
|
PG_SETMASK(&BlockSig);
|
|
/* It's not really necessary to reset the handler each time is it? */
|
|
pqsignal(SIGCHLD, reaper);
|
|
|
|
if (DebugLvl)
|
|
postmaster_error("reaping dead processes");
|
|
#ifdef HAVE_WAITPID
|
|
while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
|
|
{
|
|
exitstatus = status;
|
|
#else
|
|
while ((pid = wait3(&status, WNOHANG, NULL)) > 0)
|
|
{
|
|
exitstatus = status.w_status;
|
|
#endif
|
|
if (ShutdownPID > 0)
|
|
{
|
|
if (pid != ShutdownPID)
|
|
abort();
|
|
if (exitstatus != 0)
|
|
{
|
|
postmaster_error("Shutdown proc %d exited with status %d", pid, exitstatus);
|
|
fflush(stderr);
|
|
ExitPostmaster(1);
|
|
}
|
|
ExitPostmaster(0);
|
|
}
|
|
if (StartupPID > 0)
|
|
{
|
|
if (pid != StartupPID)
|
|
abort();
|
|
if (exitstatus != 0)
|
|
{
|
|
postmaster_error("Startup proc %d exited with status %d - abort",
|
|
pid, exitstatus);
|
|
fflush(stderr);
|
|
ExitPostmaster(1);
|
|
}
|
|
StartupPID = 0;
|
|
FatalError = false; /* done with recovery */
|
|
if (Shutdown > NoShutdown)
|
|
{
|
|
if (ShutdownPID > 0)
|
|
abort();
|
|
ShutdownPID = ShutdownDataBase();
|
|
}
|
|
|
|
/*
|
|
* Startup succeeded - remember its ID and RedoRecPtr
|
|
*/
|
|
SetThisStartUpID();
|
|
|
|
/*
|
|
* Arrange for first checkpoint to occur after standard delay.
|
|
*/
|
|
CheckPointPID = 0;
|
|
checkpointed = time(NULL);
|
|
|
|
errno = save_errno;
|
|
return;
|
|
}
|
|
CleanupProc(pid, exitstatus);
|
|
}
|
|
|
|
if (FatalError)
|
|
{
|
|
|
|
/*
|
|
* Wait for all children exit, then reset shmem and
|
|
* StartupDataBase.
|
|
*/
|
|
if (DLGetHead(BackendList) || StartupPID > 0 || ShutdownPID > 0)
|
|
{
|
|
errno = save_errno;
|
|
return;
|
|
}
|
|
tnow = time(NULL);
|
|
fprintf(stderr, gettext("Server processes were terminated at %s"
|
|
"Reinitializing shared memory and semaphores\n"),
|
|
ctime(&tnow));
|
|
fflush(stderr);
|
|
|
|
shmem_exit(0);
|
|
reset_shared(PostPortNumber);
|
|
|
|
StartupPID = StartupDataBase();
|
|
errno = save_errno;
|
|
return;
|
|
}
|
|
|
|
if (Shutdown > NoShutdown)
|
|
{
|
|
if (DLGetHead(BackendList))
|
|
{
|
|
errno = save_errno;
|
|
return;
|
|
}
|
|
if (StartupPID > 0 || ShutdownPID > 0)
|
|
{
|
|
errno = save_errno;
|
|
return;
|
|
}
|
|
ShutdownPID = ShutdownDataBase();
|
|
}
|
|
|
|
errno = save_errno;
|
|
}
|
|
|
|
/*
|
|
* CleanupProc -- cleanup after terminated backend.
|
|
*
|
|
* Remove all local state associated with backend.
|
|
*
|
|
* Dillon's note: should log child's exit status in the system log.
|
|
*/
|
|
static void
|
|
CleanupProc(int pid,
|
|
int exitstatus) /* child's exit status. */
|
|
{
|
|
Dlelem *curr,
|
|
*next;
|
|
Backend *bp;
|
|
|
|
if (DebugLvl)
|
|
postmaster_error("CleanupProc: pid %d exited with status %d",
|
|
pid, exitstatus);
|
|
|
|
/*
|
|
* If a backend dies in an ugly way (i.e. exit status not 0) then we
|
|
* must signal all other backends to quickdie. If exit status is zero
|
|
* we assume everything is hunky dory and simply remove the backend
|
|
* from the active backend list.
|
|
*/
|
|
if (exitstatus == 0)
|
|
{
|
|
curr = DLGetHead(BackendList);
|
|
while (curr)
|
|
{
|
|
bp = (Backend *) DLE_VAL(curr);
|
|
if (bp->pid == pid)
|
|
{
|
|
DLRemove(curr);
|
|
free(bp);
|
|
DLFreeElem(curr);
|
|
break;
|
|
}
|
|
curr = DLGetSucc(curr);
|
|
}
|
|
|
|
if (pid == CheckPointPID)
|
|
{
|
|
CheckPointPID = 0;
|
|
if (!FatalError)
|
|
{
|
|
checkpointed = time(NULL);
|
|
/* Update RedoRecPtr for future child backends */
|
|
GetRedoRecPtr();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Why is this done here, and not by the backend itself? */
|
|
if (!FatalError)
|
|
ProcRemove(pid);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
if (!FatalError)
|
|
{
|
|
/* Make log entry unless we did so already */
|
|
tnow = time(NULL);
|
|
fprintf(stderr, gettext("Server process (pid %d) exited with status %d at %s"
|
|
"Terminating any active server processes...\n"),
|
|
pid, exitstatus, ctime(&tnow));
|
|
fflush(stderr);
|
|
}
|
|
|
|
curr = DLGetHead(BackendList);
|
|
while (curr)
|
|
{
|
|
next = DLGetSucc(curr);
|
|
bp = (Backend *) DLE_VAL(curr);
|
|
if (bp->pid != pid)
|
|
{
|
|
|
|
/*
|
|
* This backend is still alive. Unless we did so already,
|
|
* tell it to commit hara-kiri.
|
|
*
|
|
* SIGQUIT is the special signal that says exit without proc_exit
|
|
* and let the user know what's going on. But if SendStop is
|
|
* set (-s on command line), then we send SIGSTOP instead, so
|
|
* that we can get core dumps from all backends by hand.
|
|
*/
|
|
if (!FatalError)
|
|
{
|
|
if (DebugLvl)
|
|
postmaster_error("CleanupProc: sending %s to process %d",
|
|
(SendStop ? "SIGSTOP" : "SIGQUIT"),
|
|
bp->pid);
|
|
kill(bp->pid, (SendStop ? SIGSTOP : SIGQUIT));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
|
|
/*
|
|
* Found entry for freshly-dead backend, so remove it.
|
|
*
|
|
* Don't call ProcRemove() here, since shmem may be corrupted! We
|
|
* are going to reinitialize shmem and semaphores anyway once
|
|
* all the children are dead, so no need for it.
|
|
*/
|
|
DLRemove(curr);
|
|
free(bp);
|
|
DLFreeElem(curr);
|
|
}
|
|
curr = next;
|
|
}
|
|
|
|
if (pid == CheckPointPID)
|
|
{
|
|
CheckPointPID = 0;
|
|
checkpointed = 0;
|
|
}
|
|
|
|
FatalError = true;
|
|
}
|
|
|
|
/*
|
|
* Send a signal to all backend children.
|
|
*/
|
|
static void
|
|
SignalChildren(int signal)
|
|
{
|
|
Dlelem *curr,
|
|
*next;
|
|
Backend *bp;
|
|
int mypid = getpid();
|
|
|
|
curr = DLGetHead(BackendList);
|
|
while (curr)
|
|
{
|
|
next = DLGetSucc(curr);
|
|
bp = (Backend *) DLE_VAL(curr);
|
|
|
|
if (bp->pid != mypid)
|
|
{
|
|
if (DebugLvl >= 1)
|
|
elog(DEBUG, "SignalChildren: sending signal %d to process %d",
|
|
signal, bp->pid);
|
|
|
|
kill(bp->pid, signal);
|
|
}
|
|
|
|
curr = next;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* BackendStartup -- start backend process
|
|
*
|
|
* returns: STATUS_ERROR if the fork/exec failed, STATUS_OK
|
|
* otherwise.
|
|
*
|
|
*/
|
|
static int
|
|
BackendStartup(Port *port)
|
|
{
|
|
Backend *bn; /* for backend cleanup */
|
|
int pid;
|
|
|
|
/*
|
|
* Compute the cancel key that will be assigned to this backend. The
|
|
* backend will have its own copy in the forked-off process' value of
|
|
* MyCancelKey, so that it can transmit the key to the frontend.
|
|
*/
|
|
MyCancelKey = PostmasterRandom();
|
|
|
|
/*
|
|
* Flush stdio channels just before fork, to avoid double-output
|
|
* problems. Ideally we'd use fflush(NULL) here, but there are still a
|
|
* few non-ANSI stdio libraries out there (like SunOS 4.1.x) that
|
|
* coredump if we do. Presently stdout and stderr are the only stdio
|
|
* output channels used by the postmaster, so fflush'ing them should
|
|
* be sufficient.
|
|
*/
|
|
fflush(stdout);
|
|
fflush(stderr);
|
|
|
|
#ifdef __BEOS__
|
|
/* Specific beos actions before backend startup */
|
|
beos_before_backend_startup();
|
|
#endif
|
|
|
|
if ((pid = fork()) == 0)
|
|
{ /* child */
|
|
#ifdef __BEOS__
|
|
/* Specific beos backend startup actions */
|
|
beos_backend_startup();
|
|
#endif
|
|
|
|
#ifdef CYR_RECODE
|
|
{
|
|
/* Save charset for this host while we still have client addr */
|
|
char ChTable[80];
|
|
static char cyrEnvironment[100];
|
|
|
|
GetCharSetByHost(ChTable, port->raddr.in.sin_addr.s_addr, DataDir);
|
|
if (*ChTable != '\0')
|
|
{
|
|
snprintf(cyrEnvironment, sizeof(cyrEnvironment),
|
|
"PG_RECODETABLE=%s", ChTable);
|
|
putenv(cyrEnvironment);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (DoBackend(port))
|
|
{
|
|
fprintf(stderr, gettext("%s child[%d]: BackendStartup: backend startup failed\n"),
|
|
progname, (int) getpid());
|
|
ExitPostmaster(1);
|
|
}
|
|
else
|
|
ExitPostmaster(0);
|
|
}
|
|
|
|
/* in parent */
|
|
if (pid < 0)
|
|
{
|
|
#ifdef __BEOS__
|
|
/* Specific beos backend startup actions */
|
|
beos_backend_startup_failed();
|
|
#endif
|
|
fprintf(stderr, gettext("%s: BackendStartup: fork failed: %s\n"),
|
|
progname, strerror(errno));
|
|
return STATUS_ERROR;
|
|
}
|
|
|
|
if (DebugLvl)
|
|
fprintf(stderr, gettext("%s: BackendStartup: pid %d user %s db %s socket %d\n"),
|
|
progname, pid, port->user, port->database,
|
|
port->sock);
|
|
|
|
/*
|
|
* Everything's been successful, it's safe to add this backend to our
|
|
* list of backends.
|
|
*/
|
|
if (!(bn = (Backend *) calloc(1, sizeof(Backend))))
|
|
{
|
|
fprintf(stderr, gettext("%s: BackendStartup: malloc failed\n"),
|
|
progname);
|
|
ExitPostmaster(1);
|
|
}
|
|
|
|
bn->pid = pid;
|
|
bn->cancel_key = MyCancelKey;
|
|
DLAddHead(BackendList, DLNewElem(bn));
|
|
|
|
return STATUS_OK;
|
|
}
|
|
|
|
/*
|
|
* split_opts -- split a string of options and append it to an argv array
|
|
*
|
|
* NB: the string is destructively modified!
|
|
*
|
|
* Since no current POSTGRES arguments require any quoting characters,
|
|
* we can use the simple-minded tactic of assuming each set of space-
|
|
* delimited characters is a separate argv element.
|
|
*
|
|
* If you don't like that, well, we *used* to pass the whole option string
|
|
* as ONE argument to execl(), which was even less intelligent...
|
|
*/
|
|
static void
|
|
split_opts(char **argv, int *argcp, char *s)
|
|
{
|
|
while (s && *s)
|
|
{
|
|
while (isspace((unsigned char) *s))
|
|
++s;
|
|
if (*s == '\0')
|
|
break;
|
|
argv[(*argcp)++] = s;
|
|
while (*s && !isspace((unsigned char) *s))
|
|
++s;
|
|
if (*s)
|
|
*s++ = '\0';
|
|
}
|
|
}
|
|
|
|
/*
|
|
* DoBackend -- set up the backend's argument list and invoke backend main().
|
|
*
|
|
* This used to perform an execv() but we no longer exec the backend;
|
|
* it's the same executable as the postmaster.
|
|
*
|
|
* returns:
|
|
* Shouldn't return at all.
|
|
* If PostgresMain() fails, return status.
|
|
*/
|
|
static int
|
|
DoBackend(Port *port)
|
|
{
|
|
char *av[ARGV_SIZE * 2];
|
|
int ac = 0;
|
|
char debugbuf[ARGV_SIZE];
|
|
char protobuf[ARGV_SIZE];
|
|
char dbbuf[ARGV_SIZE];
|
|
char optbuf[ARGV_SIZE];
|
|
char ttybuf[ARGV_SIZE];
|
|
int i;
|
|
struct timeval now;
|
|
struct timezone tz;
|
|
|
|
/*
|
|
* Let's clean up ourselves as the postmaster child
|
|
*/
|
|
|
|
/* We don't want the postmaster's proc_exit() handlers */
|
|
on_exit_reset();
|
|
|
|
/*
|
|
* Signal handlers setting is moved to tcop/postgres...
|
|
*/
|
|
|
|
/* Save port etc. for ps status */
|
|
MyProcPort = port;
|
|
|
|
/* Reset MyProcPid to new backend's pid */
|
|
MyProcPid = getpid();
|
|
|
|
/* Close the postmaster's other sockets */
|
|
ClosePostmasterPorts(port);
|
|
|
|
/*
|
|
* Don't want backend to be able to see the postmaster random number
|
|
* generator state. We have to clobber the static random_seed *and*
|
|
* start a new random sequence in the random() library function.
|
|
*/
|
|
random_seed = 0;
|
|
gettimeofday(&now, &tz);
|
|
srandom((unsigned int) now.tv_usec);
|
|
|
|
/* ----------------
|
|
* Now, build the argv vector that will be given to PostgresMain.
|
|
*
|
|
* The layout of the command line is
|
|
* postgres [secure switches] -p databasename [insecure switches]
|
|
* where the switches after -p come from the client request.
|
|
* ----------------
|
|
*/
|
|
|
|
av[ac++] = "postgres";
|
|
|
|
/*
|
|
* Pass the requested debugging level along to the backend. Level one
|
|
* debugging in the postmaster traces postmaster connection activity,
|
|
* and levels two and higher are passed along to the backend. This
|
|
* allows us to watch only the postmaster or the postmaster and the
|
|
* backend.
|
|
*/
|
|
if (DebugLvl > 1)
|
|
{
|
|
sprintf(debugbuf, "-d%d", DebugLvl);
|
|
av[ac++] = debugbuf;
|
|
}
|
|
|
|
/*
|
|
* Pass any backend switches specified with -o in the postmaster's own
|
|
* command line. We assume these are secure. (It's OK to mangle
|
|
* ExtraOptions since we are now in the child process; this won't
|
|
* change the postmaster's copy.)
|
|
*/
|
|
split_opts(av, &ac, ExtraOptions);
|
|
|
|
/* Tell the backend what protocol the frontend is using. */
|
|
sprintf(protobuf, "-v%u", port->proto);
|
|
av[ac++] = protobuf;
|
|
|
|
/*
|
|
* Tell the backend it is being called from the postmaster, and which
|
|
* database to use. -p marks the end of secure switches.
|
|
*/
|
|
av[ac++] = "-p";
|
|
|
|
StrNCpy(dbbuf, port->database, ARGV_SIZE);
|
|
av[ac++] = dbbuf;
|
|
|
|
/*
|
|
* Pass the (insecure) option switches from the connection request.
|
|
*/
|
|
StrNCpy(optbuf, port->options, ARGV_SIZE);
|
|
split_opts(av, &ac, optbuf);
|
|
|
|
/*
|
|
* Pass the (insecure) debug output file request.
|
|
*
|
|
* NOTE: currently, this is useless code, since the backend will not
|
|
* honor an insecure -o switch. I left it here since the backend
|
|
* could be modified to allow insecure -o, given adequate checking
|
|
* that the specified filename is something safe to write on.
|
|
*/
|
|
if (port->tty[0])
|
|
{
|
|
StrNCpy(ttybuf, port->tty, ARGV_SIZE);
|
|
av[ac++] = "-o";
|
|
av[ac++] = ttybuf;
|
|
}
|
|
|
|
av[ac] = (char *) NULL;
|
|
|
|
/*
|
|
* Release postmaster's working memory context so that backend can
|
|
* recycle the space. Note this does not trash *MyProcPort, because
|
|
* ConnCreate() allocated that space with malloc() ... else we'd need
|
|
* to copy the Port data here.
|
|
*/
|
|
MemoryContextSwitchTo(TopMemoryContext);
|
|
MemoryContextDelete(PostmasterContext);
|
|
PostmasterContext = NULL;
|
|
|
|
/*
|
|
* Debug: print arguments being passed to backend
|
|
*/
|
|
if (DebugLvl > 1)
|
|
{
|
|
fprintf(stderr, "%s child[%d]: starting with (",
|
|
progname, MyProcPid);
|
|
for (i = 0; i < ac; ++i)
|
|
fprintf(stderr, "%s ", av[i]);
|
|
fprintf(stderr, ")\n");
|
|
}
|
|
|
|
return (PostgresMain(ac, av, real_argc, real_argv, port->user));
|
|
}
|
|
|
|
/*
|
|
* ExitPostmaster -- cleanup
|
|
*
|
|
* Do NOT call exit() directly --- always go through here!
|
|
*/
|
|
static void
|
|
ExitPostmaster(int status)
|
|
{
|
|
/* should cleanup shared memory and kill all backends */
|
|
|
|
/*
|
|
* Not sure of the semantics here. When the Postmaster dies, should
|
|
* the backends all be killed? probably not.
|
|
*
|
|
* MUST -- vadim 05-10-1999
|
|
*/
|
|
if (ServerSock_INET != INVALID_SOCK)
|
|
StreamClose(ServerSock_INET);
|
|
ServerSock_INET = INVALID_SOCK;
|
|
#ifdef HAVE_UNIX_SOCKETS
|
|
if (ServerSock_UNIX != INVALID_SOCK)
|
|
StreamClose(ServerSock_UNIX);
|
|
ServerSock_UNIX = INVALID_SOCK;
|
|
#endif
|
|
|
|
proc_exit(status);
|
|
}
|
|
|
|
/* Request to schedule a checkpoint (no-op if one is currently running) */
|
|
static void
|
|
schedule_checkpoint(SIGNAL_ARGS)
|
|
{
|
|
int save_errno = errno;
|
|
|
|
PG_SETMASK(&BlockSig);
|
|
|
|
/* Ignore request if checkpointing is currently disabled */
|
|
if (CheckPointPID == 0 && checkpointed &&
|
|
Shutdown == NoShutdown && !FatalError)
|
|
{
|
|
CheckPointPID = CheckPointDataBase();
|
|
/* note: if fork fails, CheckPointPID stays 0; nothing happens */
|
|
}
|
|
|
|
errno = save_errno;
|
|
}
|
|
|
|
static void
|
|
dumpstatus(SIGNAL_ARGS)
|
|
{
|
|
int save_errno = errno;
|
|
Dlelem *curr;
|
|
|
|
PG_SETMASK(&BlockSig);
|
|
|
|
fprintf(stderr, "%s: dumpstatus:\n", progname);
|
|
|
|
curr = DLGetHead(PortList);
|
|
while (curr)
|
|
{
|
|
Port *port = DLE_VAL(curr);
|
|
|
|
fprintf(stderr, "\tsock %d\n", port->sock);
|
|
curr = DLGetSucc(curr);
|
|
}
|
|
errno = save_errno;
|
|
}
|
|
|
|
/*
|
|
* CharRemap
|
|
*/
|
|
static char
|
|
CharRemap(long int ch)
|
|
{
|
|
|
|
if (ch < 0)
|
|
ch = -ch;
|
|
|
|
ch = ch % 62;
|
|
if (ch < 26)
|
|
return 'A' + ch;
|
|
|
|
ch -= 26;
|
|
if (ch < 26)
|
|
return 'a' + ch;
|
|
|
|
ch -= 26;
|
|
return '0' + ch;
|
|
}
|
|
|
|
/*
|
|
* RandomSalt
|
|
*/
|
|
static void
|
|
RandomSalt(char *salt)
|
|
{
|
|
long rand = PostmasterRandom();
|
|
|
|
*salt = CharRemap(rand % 62);
|
|
*(salt + 1) = CharRemap(rand / 62);
|
|
}
|
|
|
|
/*
|
|
* PostmasterRandom
|
|
*/
|
|
static long
|
|
PostmasterRandom(void)
|
|
{
|
|
static bool initialized = false;
|
|
|
|
if (!initialized)
|
|
{
|
|
Assert(random_seed != 0);
|
|
srandom(random_seed);
|
|
initialized = true;
|
|
}
|
|
|
|
return random() ^ random_seed;
|
|
}
|
|
|
|
/*
|
|
* Count up number of child processes.
|
|
*/
|
|
static int
|
|
CountChildren(void)
|
|
{
|
|
Dlelem *curr;
|
|
Backend *bp;
|
|
int mypid = getpid();
|
|
int cnt = 0;
|
|
|
|
for (curr = DLGetHead(BackendList); curr; curr = DLGetSucc(curr))
|
|
{
|
|
bp = (Backend *) DLE_VAL(curr);
|
|
if (bp->pid != mypid)
|
|
cnt++;
|
|
}
|
|
if (CheckPointPID != 0)
|
|
cnt--;
|
|
return cnt;
|
|
}
|
|
|
|
#ifdef USE_SSL
|
|
/*
|
|
* Initialize SSL library and structures
|
|
*/
|
|
static void
|
|
InitSSL(void)
|
|
{
|
|
char fnbuf[2048];
|
|
|
|
SSL_load_error_strings();
|
|
SSL_library_init();
|
|
SSL_context = SSL_CTX_new(SSLv23_method());
|
|
if (!SSL_context)
|
|
{
|
|
postmaster_error("failed to create SSL context: %s",
|
|
ERR_reason_error_string(ERR_get_error()));
|
|
ExitPostmaster(1);
|
|
}
|
|
snprintf(fnbuf, sizeof(fnbuf), "%s/server.crt", DataDir);
|
|
if (!SSL_CTX_use_certificate_file(SSL_context, fnbuf, SSL_FILETYPE_PEM))
|
|
{
|
|
postmaster_error("failed to load server certificate (%s): %s",
|
|
fnbuf, ERR_reason_error_string(ERR_get_error()));
|
|
ExitPostmaster(1);
|
|
}
|
|
snprintf(fnbuf, sizeof(fnbuf), "%s/server.key", DataDir);
|
|
if (!SSL_CTX_use_PrivateKey_file(SSL_context, fnbuf, SSL_FILETYPE_PEM))
|
|
{
|
|
postmaster_error("failed to load private key file (%s): %s",
|
|
fnbuf, ERR_reason_error_string(ERR_get_error()));
|
|
ExitPostmaster(1);
|
|
}
|
|
if (!SSL_CTX_check_private_key(SSL_context))
|
|
{
|
|
postmaster_error("check of private key failed: %s",
|
|
ERR_reason_error_string(ERR_get_error()));
|
|
ExitPostmaster(1);
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Fire off a subprocess for startup/shutdown/checkpoint.
|
|
*
|
|
* Return value is subprocess' PID, or 0 if failed to start subprocess
|
|
* (0 is returned only for checkpoint case).
|
|
*/
|
|
static pid_t
|
|
SSDataBase(int xlop)
|
|
{
|
|
pid_t pid;
|
|
Backend *bn;
|
|
|
|
fflush(stdout);
|
|
fflush(stderr);
|
|
|
|
#ifdef __BEOS__
|
|
/* Specific beos actions before backend startup */
|
|
beos_before_backend_startup();
|
|
#endif
|
|
|
|
if ((pid = fork()) == 0) /* child */
|
|
{
|
|
char *av[ARGV_SIZE * 2];
|
|
int ac = 0;
|
|
char nbbuf[ARGV_SIZE];
|
|
char dbbuf[ARGV_SIZE];
|
|
char xlbuf[ARGV_SIZE];
|
|
|
|
#ifdef __BEOS__
|
|
/* Specific beos actions after backend startup */
|
|
beos_backend_startup();
|
|
#endif
|
|
|
|
/* Lose the postmaster's on-exit routines and port connections */
|
|
on_exit_reset();
|
|
|
|
/* Close the postmaster's sockets */
|
|
ClosePostmasterPorts(NULL);
|
|
|
|
/* Set up command-line arguments for subprocess */
|
|
av[ac++] = "postgres";
|
|
|
|
av[ac++] = "-d";
|
|
|
|
sprintf(nbbuf, "-B%u", NBuffers);
|
|
av[ac++] = nbbuf;
|
|
|
|
sprintf(xlbuf, "-x %d", xlop);
|
|
av[ac++] = xlbuf;
|
|
|
|
av[ac++] = "-p";
|
|
|
|
StrNCpy(dbbuf, "template1", ARGV_SIZE);
|
|
av[ac++] = dbbuf;
|
|
|
|
av[ac] = (char *) NULL;
|
|
|
|
optind = 1;
|
|
|
|
BootstrapMain(ac, av);
|
|
ExitPostmaster(0);
|
|
}
|
|
|
|
/* in parent */
|
|
if (pid < 0)
|
|
{
|
|
#ifdef __BEOS__
|
|
/* Specific beos actions before backend startup */
|
|
beos_backend_startup_failed();
|
|
#endif
|
|
|
|
fprintf(stderr, "%s Data Base: fork failed: %s\n",
|
|
((xlop == BS_XLOG_STARTUP) ? "Startup" :
|
|
((xlop == BS_XLOG_CHECKPOINT) ? "CheckPoint" :
|
|
"Shutdown")),
|
|
strerror(errno));
|
|
|
|
/*
|
|
* fork failure is fatal during startup/shutdown, but there's no
|
|
* need to choke if a routine checkpoint fails.
|
|
*/
|
|
if (xlop == BS_XLOG_CHECKPOINT)
|
|
return 0;
|
|
ExitPostmaster(1);
|
|
}
|
|
|
|
/*
|
|
* The startup and shutdown processes are not considered normal
|
|
* backends, but the checkpoint process is. Checkpoint must be added
|
|
* to the list of backends.
|
|
*/
|
|
if (xlop == BS_XLOG_CHECKPOINT)
|
|
{
|
|
if (!(bn = (Backend *) calloc(1, sizeof(Backend))))
|
|
{
|
|
postmaster_error("CheckPointDataBase: malloc failed");
|
|
ExitPostmaster(1);
|
|
}
|
|
|
|
bn->pid = pid;
|
|
bn->cancel_key = PostmasterRandom();
|
|
DLAddHead(BackendList, DLNewElem(bn));
|
|
|
|
/*
|
|
* Since this code is executed periodically, it's a fine place to
|
|
* do other actions that should happen every now and then on no
|
|
* particular schedule. Such as...
|
|
*/
|
|
TouchSocketLockFile();
|
|
}
|
|
|
|
return pid;
|
|
}
|
|
|
|
|
|
/*
|
|
* Create the opts file
|
|
*/
|
|
static bool
|
|
CreateOptsFile(int argc, char *argv[])
|
|
{
|
|
char fullprogname[MAXPGPATH];
|
|
char *filename;
|
|
FILE *fp;
|
|
unsigned i;
|
|
|
|
if (FindExec(fullprogname, argv[0], "postmaster") == -1)
|
|
return false;
|
|
|
|
filename = palloc(strlen(DataDir) + 20);
|
|
sprintf(filename, "%s/postmaster.opts", DataDir);
|
|
|
|
fp = fopen(filename, "w");
|
|
if (fp == NULL)
|
|
{
|
|
postmaster_error("cannot create file %s: %s",
|
|
filename, strerror(errno));
|
|
return false;
|
|
}
|
|
|
|
fprintf(fp, "%s", fullprogname);
|
|
for (i = 1; i < argc; i++)
|
|
fprintf(fp, " '%s'", argv[i]);
|
|
fputs("\n", fp);
|
|
|
|
if (ferror(fp))
|
|
{
|
|
postmaster_error("writing file %s failed", filename);
|
|
fclose(fp);
|
|
return false;
|
|
}
|
|
|
|
fclose(fp);
|
|
return true;
|
|
}
|
|
|
|
|
|
static void
|
|
postmaster_error(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
fprintf(stderr, "%s: ", progname);
|
|
va_start(ap, fmt);
|
|
fprintf(stderr, gettext(fmt), ap);
|
|
va_end(ap);
|
|
fprintf(stderr, "\n");
|
|
}
|