406 lines
13 KiB
C
406 lines
13 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* main.c
|
|
* Stub main() routine for the postgres executable.
|
|
*
|
|
* This does some essential startup tasks for any incarnation of postgres
|
|
* (postmaster, standalone backend, standalone bootstrap process, or a
|
|
* separately exec'd child of a postmaster) and then dispatches to the
|
|
* proper FooMain() routine for the incarnation.
|
|
*
|
|
*
|
|
* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
*
|
|
* IDENTIFICATION
|
|
* src/backend/main/main.c
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#include "postgres.h"
|
|
|
|
#include <unistd.h>
|
|
|
|
#if defined(__NetBSD__)
|
|
#include <sys/param.h>
|
|
#endif
|
|
|
|
#if defined(_M_AMD64) && _MSC_VER == 1800
|
|
#include <math.h>
|
|
#include <versionhelpers.h>
|
|
#endif
|
|
|
|
#include "bootstrap/bootstrap.h"
|
|
#include "common/username.h"
|
|
#include "port/atomics.h"
|
|
#include "postmaster/postmaster.h"
|
|
#include "storage/s_lock.h"
|
|
#include "storage/spin.h"
|
|
#include "tcop/tcopprot.h"
|
|
#include "utils/help_config.h"
|
|
#include "utils/memutils.h"
|
|
#include "utils/pg_locale.h"
|
|
#include "utils/ps_status.h"
|
|
|
|
|
|
const char *progname;
|
|
|
|
|
|
static void startup_hacks(const char *progname);
|
|
static void init_locale(const char *categoryname, int category, const char *locale);
|
|
static void help(const char *progname);
|
|
static void check_root(const char *progname);
|
|
|
|
|
|
/*
|
|
* Any Postgres server process begins execution here.
|
|
*/
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
bool do_check_root = true;
|
|
|
|
/*
|
|
* If supported on the current platform, set up a handler to be called if
|
|
* the backend/postmaster crashes with a fatal signal or exception.
|
|
*/
|
|
#if defined(WIN32) && defined(HAVE_MINIDUMP_TYPE)
|
|
pgwin32_install_crashdump_handler();
|
|
#endif
|
|
|
|
progname = get_progname(argv[0]);
|
|
|
|
/*
|
|
* Platform-specific startup hacks
|
|
*/
|
|
startup_hacks(progname);
|
|
|
|
/*
|
|
* Remember the physical location of the initially given argv[] array for
|
|
* possible use by ps display. On some platforms, the argv[] storage must
|
|
* be overwritten in order to set the process title for ps. In such cases
|
|
* save_ps_display_args makes and returns a new copy of the argv[] array.
|
|
*
|
|
* save_ps_display_args may also move the environment strings to make
|
|
* extra room. Therefore this should be done as early as possible during
|
|
* startup, to avoid entanglements with code that might save a getenv()
|
|
* result pointer.
|
|
*/
|
|
argv = save_ps_display_args(argc, argv);
|
|
|
|
/*
|
|
* Fire up essential subsystems: error and memory management
|
|
*
|
|
* Code after this point is allowed to use elog/ereport, though
|
|
* localization of messages may not work right away, and messages won't go
|
|
* anywhere but stderr until GUC settings get loaded.
|
|
*/
|
|
MemoryContextInit();
|
|
|
|
/*
|
|
* Set up locale information
|
|
*/
|
|
set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("postgres"));
|
|
|
|
/*
|
|
* In the postmaster, absorb the environment values for LC_COLLATE and
|
|
* LC_CTYPE. Individual backends will change these later to settings
|
|
* taken from pg_database, but the postmaster cannot do that. If we leave
|
|
* these set to "C" then message localization might not work well in the
|
|
* postmaster.
|
|
*/
|
|
init_locale("LC_COLLATE", LC_COLLATE, "");
|
|
init_locale("LC_CTYPE", LC_CTYPE, "");
|
|
|
|
/*
|
|
* LC_MESSAGES will get set later during GUC option processing, but we set
|
|
* it here to allow startup error messages to be localized.
|
|
*/
|
|
#ifdef LC_MESSAGES
|
|
init_locale("LC_MESSAGES", LC_MESSAGES, "");
|
|
#endif
|
|
|
|
/*
|
|
* We keep these set to "C" always, except transiently in pg_locale.c; see
|
|
* that file for explanations.
|
|
*/
|
|
init_locale("LC_MONETARY", LC_MONETARY, "C");
|
|
init_locale("LC_NUMERIC", LC_NUMERIC, "C");
|
|
init_locale("LC_TIME", LC_TIME, "C");
|
|
|
|
/*
|
|
* Now that we have absorbed as much as we wish to from the locale
|
|
* environment, remove any LC_ALL setting, so that the environment
|
|
* variables installed by pg_perm_setlocale have force.
|
|
*/
|
|
unsetenv("LC_ALL");
|
|
|
|
check_strxfrm_bug();
|
|
|
|
/*
|
|
* Catch standard options before doing much else, in particular before we
|
|
* insist on not being root.
|
|
*/
|
|
if (argc > 1)
|
|
{
|
|
if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
|
|
{
|
|
help(progname);
|
|
exit(0);
|
|
}
|
|
if (strcmp(argv[1], "--version") == 0 || strcmp(argv[1], "-V") == 0)
|
|
{
|
|
fputs(PG_BACKEND_VERSIONSTR, stdout);
|
|
exit(0);
|
|
}
|
|
|
|
/*
|
|
* In addition to the above, we allow "--describe-config" and "-C var"
|
|
* to be called by root. This is reasonably safe since these are
|
|
* read-only activities. The -C case is important because pg_ctl may
|
|
* try to invoke it while still holding administrator privileges on
|
|
* Windows. Note that while -C can normally be in any argv position,
|
|
* if you want to bypass the root check you must put it first. This
|
|
* reduces the risk that we might misinterpret some other mode's -C
|
|
* switch as being the postmaster/postgres one.
|
|
*/
|
|
if (strcmp(argv[1], "--describe-config") == 0)
|
|
do_check_root = false;
|
|
else if (argc > 2 && strcmp(argv[1], "-C") == 0)
|
|
do_check_root = false;
|
|
}
|
|
|
|
/*
|
|
* Make sure we are not running as root, unless it's safe for the selected
|
|
* option.
|
|
*/
|
|
if (do_check_root)
|
|
check_root(progname);
|
|
|
|
/*
|
|
* Dispatch to one of various subprograms depending on first argument.
|
|
*/
|
|
|
|
#ifdef EXEC_BACKEND
|
|
if (argc > 1 && strncmp(argv[1], "--fork", 6) == 0)
|
|
SubPostmasterMain(argc, argv); /* does not return */
|
|
#endif
|
|
|
|
#ifdef WIN32
|
|
|
|
/*
|
|
* Start our win32 signal implementation
|
|
*
|
|
* SubPostmasterMain() will do this for itself, but the remaining modes
|
|
* need it here
|
|
*/
|
|
pgwin32_signal_initialize();
|
|
#endif
|
|
|
|
if (argc > 1 && strcmp(argv[1], "--boot") == 0)
|
|
AuxiliaryProcessMain(argc, argv); /* does not return */
|
|
else if (argc > 1 && strcmp(argv[1], "--describe-config") == 0)
|
|
GucInfoMain(); /* does not return */
|
|
else if (argc > 1 && strcmp(argv[1], "--single") == 0)
|
|
PostgresMain(argc, argv,
|
|
NULL, /* no dbname */
|
|
strdup(get_user_name_or_exit(progname))); /* does not return */
|
|
else
|
|
PostmasterMain(argc, argv); /* does not return */
|
|
abort(); /* should not get here */
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Place platform-specific startup hacks here. This is the right
|
|
* place to put code that must be executed early in the launch of any new
|
|
* server process. Note that this code will NOT be executed when a backend
|
|
* or sub-bootstrap process is forked, unless we are in a fork/exec
|
|
* environment (ie EXEC_BACKEND is defined).
|
|
*
|
|
* XXX The need for code here is proof that the platform in question
|
|
* is too brain-dead to provide a standard C execution environment
|
|
* without help. Avoid adding more here, if you can.
|
|
*/
|
|
static void
|
|
startup_hacks(const char *progname)
|
|
{
|
|
/*
|
|
* Windows-specific execution environment hacking.
|
|
*/
|
|
#ifdef WIN32
|
|
{
|
|
WSADATA wsaData;
|
|
int err;
|
|
|
|
/* Make output streams unbuffered by default */
|
|
setvbuf(stdout, NULL, _IONBF, 0);
|
|
setvbuf(stderr, NULL, _IONBF, 0);
|
|
|
|
/* Prepare Winsock */
|
|
err = WSAStartup(MAKEWORD(2, 2), &wsaData);
|
|
if (err != 0)
|
|
{
|
|
write_stderr("%s: WSAStartup failed: %d\n",
|
|
progname, err);
|
|
exit(1);
|
|
}
|
|
|
|
/* In case of general protection fault, don't show GUI popup box */
|
|
SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOGPFAULTERRORBOX);
|
|
|
|
#if defined(_M_AMD64) && _MSC_VER == 1800
|
|
|
|
/*----------
|
|
* Avoid crashing in certain floating-point operations if we were
|
|
* compiled for x64 with MS Visual Studio 2013 and are running on
|
|
* Windows prior to 7/2008R2 SP1 on an AVX2-capable CPU.
|
|
*
|
|
* Ref: https://connect.microsoft.com/VisualStudio/feedback/details/811093/visual-studio-2013-rtm-c-x64-code-generation-bug-for-avx2-instructions
|
|
*----------
|
|
*/
|
|
if (!IsWindows7SP1OrGreater())
|
|
{
|
|
_set_FMA3_enable(0);
|
|
}
|
|
#endif /* defined(_M_AMD64) && _MSC_VER == 1800 */
|
|
|
|
}
|
|
#endif /* WIN32 */
|
|
|
|
/*
|
|
* Initialize dummy_spinlock, in case we are on a platform where we have
|
|
* to use the fallback implementation of pg_memory_barrier().
|
|
*/
|
|
SpinLockInit(&dummy_spinlock);
|
|
}
|
|
|
|
|
|
/*
|
|
* Make the initial permanent setting for a locale category. If that fails,
|
|
* perhaps due to LC_foo=invalid in the environment, use locale C. If even
|
|
* that fails, perhaps due to out-of-memory, the entire startup fails with it.
|
|
* When this returns, we are guaranteed to have a setting for the given
|
|
* category's environment variable.
|
|
*/
|
|
static void
|
|
init_locale(const char *categoryname, int category, const char *locale)
|
|
{
|
|
if (pg_perm_setlocale(category, locale) == NULL &&
|
|
pg_perm_setlocale(category, "C") == NULL)
|
|
elog(FATAL, "could not adopt \"%s\" locale nor C locale for %s",
|
|
locale, categoryname);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Help display should match the options accepted by PostmasterMain()
|
|
* and PostgresMain().
|
|
*
|
|
* XXX On Windows, non-ASCII localizations of these messages only display
|
|
* correctly if the console output code page covers the necessary characters.
|
|
* Messages emitted in write_console() do not exhibit this problem.
|
|
*/
|
|
static void
|
|
help(const char *progname)
|
|
{
|
|
printf(_("%s is the PostgreSQL server.\n\n"), progname);
|
|
printf(_("Usage:\n %s [OPTION]...\n\n"), progname);
|
|
printf(_("Options:\n"));
|
|
printf(_(" -B NBUFFERS number of shared buffers\n"));
|
|
printf(_(" -c NAME=VALUE set run-time parameter\n"));
|
|
printf(_(" -C NAME print value of run-time parameter, then exit\n"));
|
|
printf(_(" -d 1-5 debugging level\n"));
|
|
printf(_(" -D DATADIR database directory\n"));
|
|
printf(_(" -e use European date input format (DMY)\n"));
|
|
printf(_(" -F turn fsync off\n"));
|
|
printf(_(" -h HOSTNAME host name or IP address to listen on\n"));
|
|
printf(_(" -i enable TCP/IP connections\n"));
|
|
printf(_(" -k DIRECTORY Unix-domain socket location\n"));
|
|
#ifdef USE_SSL
|
|
printf(_(" -l enable SSL connections\n"));
|
|
#endif
|
|
printf(_(" -N MAX-CONNECT maximum number of allowed connections\n"));
|
|
printf(_(" -o OPTIONS pass \"OPTIONS\" to each server process (obsolete)\n"));
|
|
printf(_(" -p PORT port number to listen on\n"));
|
|
printf(_(" -s show statistics after each query\n"));
|
|
printf(_(" -S WORK-MEM set amount of memory for sorts (in kB)\n"));
|
|
printf(_(" -V, --version output version information, then exit\n"));
|
|
printf(_(" --NAME=VALUE set run-time parameter\n"));
|
|
printf(_(" --describe-config describe configuration parameters, then exit\n"));
|
|
printf(_(" -?, --help show this help, then exit\n"));
|
|
|
|
printf(_("\nDeveloper options:\n"));
|
|
printf(_(" -f s|i|n|m|h forbid use of some plan types\n"));
|
|
printf(_(" -n do not reinitialize shared memory after abnormal exit\n"));
|
|
printf(_(" -O allow system table structure changes\n"));
|
|
printf(_(" -P disable system indexes\n"));
|
|
printf(_(" -t pa|pl|ex show timings after each query\n"));
|
|
printf(_(" -T send SIGSTOP to all backend processes if one dies\n"));
|
|
printf(_(" -W NUM wait NUM seconds to allow attach from a debugger\n"));
|
|
|
|
printf(_("\nOptions for single-user mode:\n"));
|
|
printf(_(" --single selects single-user mode (must be first argument)\n"));
|
|
printf(_(" DBNAME database name (defaults to user name)\n"));
|
|
printf(_(" -d 0-5 override debugging level\n"));
|
|
printf(_(" -E echo statement before execution\n"));
|
|
printf(_(" -j do not use newline as interactive query delimiter\n"));
|
|
printf(_(" -r FILENAME send stdout and stderr to given file\n"));
|
|
|
|
printf(_("\nOptions for bootstrapping mode:\n"));
|
|
printf(_(" --boot selects bootstrapping mode (must be first argument)\n"));
|
|
printf(_(" DBNAME database name (mandatory argument in bootstrapping mode)\n"));
|
|
printf(_(" -r FILENAME send stdout and stderr to given file\n"));
|
|
printf(_(" -x NUM internal use\n"));
|
|
|
|
printf(_("\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 <%s>.\n"), PACKAGE_BUGREPORT);
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
check_root(const char *progname)
|
|
{
|
|
#ifndef WIN32
|
|
if (geteuid() == 0)
|
|
{
|
|
write_stderr("\"root\" execution of the PostgreSQL server is not permitted.\n"
|
|
"The server must be started under an unprivileged user ID to prevent\n"
|
|
"possible system security compromise. See the documentation for\n"
|
|
"more information on how to properly start the server.\n");
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* Also make sure that real and effective uids are the same. Executing as
|
|
* a setuid program from a root shell is a security hole, since on many
|
|
* platforms a nefarious subroutine could setuid back to root if real uid
|
|
* is root. (Since nobody actually uses postgres as a setuid program,
|
|
* trying to actively fix this situation seems more trouble than it's
|
|
* worth; we'll just expend the effort to check for it.)
|
|
*/
|
|
if (getuid() != geteuid())
|
|
{
|
|
write_stderr("%s: real and effective user IDs must match\n",
|
|
progname);
|
|
exit(1);
|
|
}
|
|
#else /* WIN32 */
|
|
if (pgwin32_is_admin())
|
|
{
|
|
write_stderr("Execution of PostgreSQL by a user with administrative permissions is not\n"
|
|
"permitted.\n"
|
|
"The server must be started under an unprivileged user ID to prevent\n"
|
|
"possible system security compromises. See the documentation for\n"
|
|
"more information on how to properly start the server.\n");
|
|
exit(1);
|
|
}
|
|
#endif /* WIN32 */
|
|
}
|