mirror of
https://github.com/postgres/postgres.git
synced 2025-04-22 23:02:54 +03:00
dcb09b595f
Add support for collecting "minidump" style crash dumps on Windows, by setting up an exception handling filter. Crash dumps will be generated in PGDATA/crashdumps if the directory is created (the existance of the directory is used as on/off switch for the generation of the dumps). Craig Ringer and Magnus Hagander
410 lines
12 KiB
C
410 lines
12 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) 1996-2010, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
*
|
|
* IDENTIFICATION
|
|
* src/backend/main/main.c
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#include "postgres.h"
|
|
|
|
#include <pwd.h>
|
|
#include <unistd.h>
|
|
|
|
#if defined(__alpha) && defined(__osf__) /* no __alpha__ ? */
|
|
#include <sys/sysinfo.h>
|
|
#include "machine/hal_sysinfo.h"
|
|
#define ASSEMBLER
|
|
#include <sys/proc.h>
|
|
#undef ASSEMBLER
|
|
#endif
|
|
|
|
#if defined(__NetBSD__)
|
|
#include <sys/param.h>
|
|
#endif
|
|
|
|
#include "bootstrap/bootstrap.h"
|
|
#include "postmaster/postmaster.h"
|
|
#include "tcop/tcopprot.h"
|
|
#include "utils/help_config.h"
|
|
#include "utils/pg_locale.h"
|
|
#include "utils/ps_status.h"
|
|
#ifdef WIN32
|
|
#include "libpq/pqsignal.h"
|
|
#endif
|
|
|
|
|
|
const char *progname;
|
|
|
|
|
|
static void startup_hacks(const char *progname);
|
|
static void help(const char *progname);
|
|
static void check_root(const char *progname);
|
|
static char *get_current_username(const char *progname);
|
|
|
|
|
|
/*
|
|
* Any Postgres server process begins execution here.
|
|
*/
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
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);
|
|
|
|
/*
|
|
* If supported on the current platform, set up a handler to be called if
|
|
* the backend/postmaster crashes with a fatal signal or exception.
|
|
*/
|
|
#ifdef WIN32
|
|
pgwin32_install_crashdump_handler();
|
|
#endif
|
|
|
|
/*
|
|
* Set up locale information from environment. Note that LC_CTYPE and
|
|
* LC_COLLATE will be overridden later from pg_control if we are in an
|
|
* already-initialized database. We set them here so that they will be
|
|
* available to fill pg_control during initdb. LC_MESSAGES will get set
|
|
* later during GUC option processing, but we set it here to allow startup
|
|
* error messages to be localized.
|
|
*/
|
|
|
|
set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("postgres"));
|
|
|
|
#ifdef WIN32
|
|
|
|
/*
|
|
* Windows uses codepages rather than the environment, so we work around
|
|
* that by querying the environment explicitly first for LC_COLLATE and
|
|
* LC_CTYPE. We have to do this because initdb passes those values in the
|
|
* environment. If there is nothing there we fall back on the codepage.
|
|
*/
|
|
{
|
|
char *env_locale;
|
|
|
|
if ((env_locale = getenv("LC_COLLATE")) != NULL)
|
|
pg_perm_setlocale(LC_COLLATE, env_locale);
|
|
else
|
|
pg_perm_setlocale(LC_COLLATE, "");
|
|
|
|
if ((env_locale = getenv("LC_CTYPE")) != NULL)
|
|
pg_perm_setlocale(LC_CTYPE, env_locale);
|
|
else
|
|
pg_perm_setlocale(LC_CTYPE, "");
|
|
}
|
|
#else
|
|
pg_perm_setlocale(LC_COLLATE, "");
|
|
pg_perm_setlocale(LC_CTYPE, "");
|
|
#endif
|
|
|
|
#ifdef LC_MESSAGES
|
|
pg_perm_setlocale(LC_MESSAGES, "");
|
|
#endif
|
|
|
|
/*
|
|
* We keep these set to "C" always, except transiently in pg_locale.c; see
|
|
* that file for explanations.
|
|
*/
|
|
pg_perm_setlocale(LC_MONETARY, "C");
|
|
pg_perm_setlocale(LC_NUMERIC, "C");
|
|
pg_perm_setlocale(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");
|
|
|
|
/*
|
|
* Catch standard options before doing much else
|
|
*/
|
|
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)
|
|
{
|
|
puts("postgres (PostgreSQL) " PG_VERSION);
|
|
exit(0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Make sure we are not running as 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)
|
|
exit(SubPostmasterMain(argc, argv));
|
|
#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 */
|
|
|
|
if (argc > 1 && strcmp(argv[1], "--describe-config") == 0)
|
|
exit(GucInfoMain());
|
|
|
|
if (argc > 1 && strcmp(argv[1], "--single") == 0)
|
|
exit(PostgresMain(argc, argv, get_current_username(progname)));
|
|
|
|
exit(PostmasterMain(argc, argv));
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
/*
|
|
* On some platforms, unaligned memory accesses result in a kernel trap;
|
|
* the default kernel behavior is to emulate the memory access, but this
|
|
* results in a significant performance penalty. We want PG never to
|
|
* make such unaligned memory accesses, so this code disables the kernel
|
|
* emulation: unaligned accesses will result in SIGBUS instead.
|
|
*/
|
|
#ifdef NOFIXADE
|
|
|
|
#if defined(ultrix4)
|
|
syscall(SYS_sysmips, MIPS_FIXADE, 0, NULL, NULL, NULL);
|
|
#endif
|
|
|
|
#if defined(__alpha) /* no __alpha__ ? */
|
|
{
|
|
int buffer[] = {SSIN_UACPROC, UAC_SIGBUS | UAC_NOPRINT};
|
|
|
|
if (setsysinfo(SSI_NVPAIRS, buffer, 1, (caddr_t) NULL,
|
|
(unsigned long) NULL) < 0)
|
|
write_stderr("%s: setsysinfo failed: %s\n",
|
|
progname, strerror(errno));
|
|
}
|
|
#endif /* __alpha */
|
|
|
|
#endif /* NOFIXADE */
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
#endif /* WIN32 */
|
|
}
|
|
|
|
|
|
/*
|
|
* Help display should match the options accepted by PostmasterMain()
|
|
* and PostgresMain().
|
|
*/
|
|
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"));
|
|
#ifdef USE_ASSERT_CHECKING
|
|
printf(_(" -A 1|0 enable/disable run-time assert checking\n"));
|
|
#endif
|
|
printf(_(" -B NBUFFERS number of shared buffers\n"));
|
|
printf(_(" -c NAME=VALUE set run-time parameter\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(_(" --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(_(" --version output version information, 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 servers 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 <pgsql-bugs@postgresql.org>.\n"));
|
|
}
|
|
|
|
|
|
|
|
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 */
|
|
}
|
|
|
|
|
|
|
|
static char *
|
|
get_current_username(const char *progname)
|
|
{
|
|
#ifndef WIN32
|
|
struct passwd *pw;
|
|
|
|
pw = getpwuid(geteuid());
|
|
if (pw == NULL)
|
|
{
|
|
write_stderr("%s: invalid effective UID: %d\n",
|
|
progname, (int) geteuid());
|
|
exit(1);
|
|
}
|
|
/* Allocate new memory because later getpwuid() calls can overwrite it. */
|
|
return strdup(pw->pw_name);
|
|
#else
|
|
long namesize = 256 /* UNLEN */ + 1;
|
|
char *name;
|
|
|
|
name = malloc(namesize);
|
|
if (!GetUserName(name, &namesize))
|
|
{
|
|
write_stderr("%s: could not determine user name (GetUserName failed)\n",
|
|
progname);
|
|
exit(1);
|
|
}
|
|
|
|
return name;
|
|
#endif
|
|
}
|