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@ -10,7 +10,7 @@ |
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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 1.77 1998/05/27 18:32:02 momjian Exp $ |
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* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.78 1998/05/29 17:00:09 momjian Exp $ |
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* |
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* NOTES |
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* |
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@ -82,6 +82,8 @@ |
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#include "miscadmin.h" |
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#include "version.h" |
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#include "lib/dllist.h" |
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#include "tcop/tcopprot.h" |
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#include "commands/async.h" |
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#include "nodes/nodes.h" |
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#include "utils/mcxt.h" |
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#include "storage/proc.h" |
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@ -91,16 +93,6 @@ |
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#endif |
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#include "storage/fd.h" |
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#if defined(DBX_VERSION) |
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#define FORK() (0) |
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#else |
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#ifndef HAVE_VFORK |
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#define FORK() fork() |
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#else |
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#define FORK() vfork() |
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#endif |
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#endif |
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#if !defined(MAXINT) |
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#define MAXINT INT_MAX |
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#endif |
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@ -165,6 +157,7 @@ static IpcMemoryKey ipc_key; |
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static int NextBackendId = MAXINT; /* XXX why? */ |
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static char *progname = (char *) NULL; |
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static char **argv_name; |
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/*
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* Default Values |
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@ -192,6 +185,19 @@ static int SendStop = false; |
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static bool NetServer = false; /* if not zero, postmaster listen for
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* non-local connections */ |
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/*
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* GH: For !HAVE_SIGPROCMASK (NEXTSTEP), TRH implemented an |
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* alternative interface. |
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*/ |
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#ifdef HAVE_SIGPROCMASK |
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static sigset_t oldsigmask, |
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newsigmask; |
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#else |
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static int orgsigmask = sigblock(0); |
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#endif |
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/*
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* postmaster.c - function prototypes |
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*/ |
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@ -202,7 +208,7 @@ static void pmdie(SIGNAL_ARGS); |
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static void reaper(SIGNAL_ARGS); |
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static void dumpstatus(SIGNAL_ARGS); |
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static void CleanupProc(int pid, int exitstatus); |
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static int DoExec(Port *port); |
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static int DoBackend(Port *port); |
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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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@ -284,7 +290,6 @@ int |
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PostmasterMain(int argc, char *argv[]) |
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{ |
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extern int NBuffers; /* from buffer/bufmgr.c */ |
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extern bool IsPostmaster; /* from smgr/mm.c */ |
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int opt; |
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char *hostName; |
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int status; |
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@ -293,9 +298,8 @@ PostmasterMain(int argc, char *argv[]) |
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char hostbuf[MAXHOSTNAMELEN]; |
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progname = argv[0]; |
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IsPostmaster = true; |
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argv_name = &argv[0]; |
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/*
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* for security, no dir or file created can be group or other |
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* accessible |
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@ -531,26 +535,14 @@ ServerLoop(void) |
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int nSockets; |
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Dlelem *curr; |
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/*
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* GH: For !HAVE_SIGPROCMASK (NEXTSTEP), TRH implemented an |
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* alternative interface. |
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*/ |
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#ifdef HAVE_SIGPROCMASK |
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sigset_t oldsigmask, |
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newsigmask; |
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#else |
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int orgsigmask = sigblock(0); |
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#endif |
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nSockets = initMasks(&readmask, &writemask); |
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#ifdef HAVE_SIGPROCMASK |
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sigprocmask(0, 0, &oldsigmask); |
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sigprocmask(0, NULL, &oldsigmask); |
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sigemptyset(&newsigmask); |
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sigaddset(&newsigmask, SIGCHLD); |
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#endif |
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for (;;) |
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{ |
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Port *port; |
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@ -1048,13 +1040,17 @@ BackendStartup(Port *port) |
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fprintf(stderr, "-----------------------------------------\n"); |
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} |
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if ((pid = FORK()) == 0) |
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{ /* child */ |
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if (DoExec(port)) |
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fprintf(stderr, "%s child[%d]: BackendStartup: execv failed\n", |
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progname, pid); |
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/* use _exit to keep from double-flushing stdio */ |
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_exit(1); |
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if ((pid = fork()) == 0) |
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{ /* child */ |
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if (DoBackend(port)) |
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{ |
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fprintf(stderr, "%s child[%d]: BackendStartup: backend startup failed\n", |
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progname, pid); |
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/* use _exit to keep from double-flushing stdio */ |
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_exit(1); |
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} |
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else |
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_exit(0); |
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} |
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/* in parent */ |
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@ -1123,19 +1119,14 @@ split_opts(char **argv, int *argcp, char *s) |
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} |
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/*
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* DoExec -- set up the argument list and perform an execv system call |
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* |
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* Tries fairly hard not to dork with anything that isn't automatically |
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* allocated so we don't do anything weird to the postmaster when it gets |
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* its thread back. (This is vfork() we're talking about. If we're using |
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* fork() because we don't have vfork(), then we don't really care.) |
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* DoBackend -- set up the argument list and perform an execv system call |
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* |
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* returns: |
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* Shouldn't return at all. |
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* If execv() fails, return status. |
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* returns:
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* Shouldn't return at all. |
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* If execv() fails, return status. |
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*/ |
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static int |
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DoExec(Port *port) |
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DoBackend(Port *port) |
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{ |
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char execbuf[MAXPATHLEN]; |
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char portbuf[ARGV_SIZE]; |
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@ -1154,9 +1145,58 @@ DoExec(Port *port) |
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int ac = 0; |
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int i; |
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/*
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* Let's clean up ourselves as the postmaster child |
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*/ |
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clear_exitpg(); /* we don't want the postmaster's exitpg() handlers */ |
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/* ----------------
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* register signal handlers. |
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* Thanks to the postmaster, these are currently blocked. |
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* ---------------- |
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*/ |
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pqsignal(SIGINT, die); |
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pqsignal(SIGHUP, die); |
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pqsignal(SIGTERM, die); |
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pqsignal(SIGPIPE, die); |
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pqsignal(SIGUSR1, quickdie); |
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pqsignal(SIGUSR2, Async_NotifyHandler); |
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pqsignal(SIGFPE, FloatExceptionHandler); |
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pqsignal(SIGCHLD, SIG_DFL); |
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pqsignal(SIGTTIN, SIG_DFL); |
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pqsignal(SIGTTOU, SIG_DFL); |
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pqsignal(SIGCONT, SIG_DFL); |
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/* OK, let's unblock our signals, all together now... */ |
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sigprocmask(SIG_SETMASK, &oldsigmask, 0); |
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/* Close the postmater sockets */ |
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if (NetServer) |
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StreamClose(ServerSock_INET); |
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StreamClose(ServerSock_UNIX); |
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/* Now, on to standard postgres stuff */ |
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MyProcPid = getpid(); |
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strncpy(execbuf, Execfile, MAXPATHLEN - 1); |
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av[ac++] = execbuf; |
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/*
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* We need to set our argv[0] to an absolute path name because |
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* some OS's use this for dynamic loading, like BSDI. Without it, |
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* when we change directories to the database dir, the dynamic |
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* loader can't find the base executable and fails. |
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* Another advantage is that this changes the 'ps' displayed |
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* process name on some platforms. It does on BSDI. That's |
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* a big win. |
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*/ |
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*argv_name = Execfile; |
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/* Tell the backend it is being called from the postmaster */ |
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av[ac++] = "-p"; |
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@ -1195,7 +1235,7 @@ DoExec(Port *port) |
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/* Tell the backend what protocol the frontend is using. */ |
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sprintf(protobuf, "-v %u", port->proto); |
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sprintf(protobuf, "-v%u", port->proto); |
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av[ac++] = protobuf; |
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StrNCpy(dbbuf, port->database, ARGV_SIZE); |
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@ -1205,14 +1245,14 @@ DoExec(Port *port) |
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if (DebugLvl > 1) |
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{ |
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fprintf(stderr, "%s child[%ld]: execv(", |
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progname, (long) MyProcPid); |
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fprintf(stderr, "%s child[%d]: starting with (", |
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progname, MyProcPid); |
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for (i = 0; i < ac; ++i) |
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fprintf(stderr, "%s, ", av[i]); |
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fprintf(stderr, ")\n"); |
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} |
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return (execv(av[0], av)); |
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return(PostgresMain(ac, av)); |
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} |
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/*
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@ -1228,9 +1268,9 @@ ExitPostmaster(int status) |
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* the backends all be killed? probably not. |
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*/ |
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if (ServerSock_INET != INVALID_SOCK) |
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close(ServerSock_INET); |
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StreamClose(ServerSock_INET); |
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if (ServerSock_UNIX != INVALID_SOCK) |
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close(ServerSock_UNIX); |
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StreamClose(ServerSock_UNIX); |
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exitpg(status); |
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} |
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Bruce Momjian
28 years ago