mariadb/server-tools/instance-manager/mysqlmanager.cc
unknown f3e4ce926d Merge mysql.com:/home/kent/bk/main/mysql-5.0
into  mysql.com:/home/kent/bk/main/mysql-5.1


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storage/ndb/test/ndbapi/bank/Makefile.am:
  Auto merged
storage/ndb/test/ndbapi/testBasic.cpp:
  Auto merged
storage/ndb/test/ndbapi/testIndex.cpp:
  Auto merged
storage/ndb/test/run-test/Makefile.am:
  Auto merged
storage/ndb/test/run-test/daily-basic-tests.txt:
  Auto merged
storage/ndb/test/src/Makefile.am:
  Auto merged
storage/ndb/test/tools/Makefile.am:
  Auto merged
storage/ndb/tools/Makefile.am:
  Auto merged
strings/Makefile.am:
  Auto merged
strings/ctype-extra.c:
  Auto merged
tests/Makefile.am:
  Auto merged
vio/Makefile.am:
  Auto merged
BitKeeper/deleted/.del-colspec-fix.pl~6c78d3332330b19e:
  Auto merged
BitKeeper/deleted/.del-docbook-fixup.pl~46cf3bdef147084e:
  Auto merged
BitKeeper/deleted/.del-docbook-prefix.pl~876c7d33c68c224a:
  Auto merged
BitKeeper/deleted/.del-docbook-split~be931c3922898d0:
  Auto merged
BitKeeper/deleted/.del-make-docbook~ccac1eb717e92ac9:
  Auto merged
BitKeeper/deleted/.del-make-makefile~39fd454b487126e8:
  Auto merged
BitKeeper/deleted/.del-test-make-manual-de~33cad2886311b8a:
  Auto merged
BitKeeper/deleted/.del-test-make-manual~5da458f958a424ec:
  Auto merged
BitKeeper/deleted/.del-xwf~76b97805d9146b80:
  Auto merged
server-tools/instance-manager/listener.h:
  SCCS merged
server-tools/instance-manager/manager.h:
  SCCS merged
server-tools/instance-manager/mysql_connection.h:
  SCCS merged
server-tools/instance-manager/priv.h:
  SCCS merged
storage/ndb/src/kernel/blocks/dblqh/Makefile.am:
  SCCS merged
2006-12-31 01:32:21 +01:00

394 lines
10 KiB
C++

/* Copyright (C) 2003-2006 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <my_global.h>
#include <my_sys.h>
#include <string.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifndef __WIN__
#include <pwd.h>
#include <grp.h>
#include <sys/wait.h>
#endif
#include "log.h"
#include "manager.h"
#include "options.h"
#include "priv.h"
#include "user_management_commands.h"
#ifdef __WIN__
#include "IMService.h"
#include "WindowsService.h"
#endif
/*
Few notes about Instance Manager architecture:
Instance Manager consisits of two processes: the angel process, and the
instance manager process. Responsibilities of the angel process is to
monitor the instance manager process, and restart it in case of
failure/shutdown. The angel process is started only if startup option
'--run-as-service' is provided.
The Instance Manager process consists of several
subsystems (thread sets):
- the signal handling thread: it's responsibilities are to handle
user signals and propogate them to the other threads. All other threads
are accounted in the signal handler thread Thread Registry.
- the listener: listens all sockets. There is a listening
socket for each (mysql, http, snmp, rendezvous (?)) subsystem.
- mysql subsystem: Instance Manager acts like an ordinary MySQL Server,
but with very restricted command set. Each MySQL client connection is
handled in a separate thread. All MySQL client connections threads
constitute mysql subsystem.
- http subsystem: it is also possible to talk with Instance Manager via
http. One thread per http connection is used. Threads are pooled.
- 'snmp' connections (FIXME: I know nothing about it yet)
- rendezvous threads
*/
static void init_environment(char *progname);
#ifndef __WIN__
static void daemonize(const char *log_file_name);
static void angel();
static struct passwd *check_user(const char *user);
static int set_user(const char *user, struct passwd *user_info);
#endif
/*
main, entry point
- init environment
- handle options
- daemonize and run angel process (if necessary)
- run manager process
*/
int main(int argc, char *argv[])
{
int return_value= 1;
init_environment(argv[0]);
if ((return_value= Options::load(argc, argv)))
goto main_end;
if (Options::User_management::cmd)
{
return_value= Options::User_management::cmd->execute();
goto main_end;
}
#ifndef __WIN__
struct passwd *user_info;
if ((user_info= check_user(Options::Daemon::user)))
{
if (set_user(Options::Daemon::user, user_info))
{
return_value= 1;
goto main_end;
}
}
if (Options::Daemon::run_as_service)
{
/* forks, and returns only in child */
daemonize(Options::Daemon::log_file_name);
/* forks again, and returns only in child: parent becomes angel */
angel();
}
(void) Manager::main(); /* ignore the return value for now */
#else
if (!Options::Service::stand_alone)
{
if (HandleServiceOptions())
{
return_value= 1;
goto main_end;
}
}
else
{
(void) Manager::main(); /* ignore the return value for now */
}
#endif
return_value= 0;
main_end:
Options::cleanup();
my_end(0);
return return_value;
}
/******************* Auxilary functions implementation **********************/
#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
/* Change to run as another user if started with --user */
static struct passwd *check_user(const char *user)
{
struct passwd *user_info;
uid_t user_id= geteuid();
/* Don't bother if we aren't superuser */
if (user_id)
{
if (user)
{
/* Don't give a warning, if real user is same as given with --user */
user_info= getpwnam(user);
if ((!user_info || user_id != user_info->pw_uid))
log_info("One can only use the --user switch if running as root\n");
}
return NULL;
}
if (!user)
{
log_info("You are running mysqlmanager as root! This might introduce security problems. It is safer to use --user option istead.\n");
return NULL;
}
if (!strcmp(user, "root"))
return NULL; /* Avoid problem with dynamic libraries */
if (!(user_info= getpwnam(user)))
{
/* Allow a numeric uid to be used */
const char *pos;
for (pos= user; my_isdigit(default_charset_info, *pos); pos++)
{}
if (*pos) /* Not numeric id */
goto err;
if (!(user_info= getpwuid(atoi(user))))
goto err;
else
return user_info;
}
else
return user_info;
err:
log_error("Can not start under user '%s'.",
(const char *) user);
return NULL;
}
static int set_user(const char *user, struct passwd *user_info)
{
DBUG_ASSERT(user_info);
#ifdef HAVE_INITGROUPS
initgroups((char*) user,user_info->pw_gid);
#endif
if (setgid(user_info->pw_gid) == -1)
{
log_error("setgid() failed");
return 1;
}
if (setuid(user_info->pw_uid) == -1)
{
log_error("setuid() failed");
return 1;
}
return 0;
}
#endif
/*
Init environment, common for daemon and non-daemon
*/
static void init_environment(char *progname)
{
MY_INIT(progname);
log_init();
umask(0117);
srand((unsigned int) time(0));
}
#ifndef __WIN__
/*
Become a UNIX service
SYNOPSIS
daemonize()
*/
static void daemonize(const char *log_file_name)
{
pid_t pid= fork();
switch (pid) {
case -1: // parent, fork error
die("daemonize(): fork failed, %s", strerror(errno));
case 0: // child, fork ok
int fd;
/*
Become a session leader: setsid must succeed because child is
guaranteed not to be a process group leader (it belongs to the
process group of the parent.)
The goal is not to have a controlling terminal.
*/
setsid();
/*
As we now don't have a controlling terminal we will not receive
tty-related signals - no need to ignore them.
*/
close(STDIN_FILENO);
fd= open(log_file_name, O_WRONLY | O_CREAT | O_APPEND | O_NOCTTY,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
if (fd < 0)
die("daemonize(): failed to open log file %s, %s", log_file_name,
strerror(errno));
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
if (fd != STDOUT_FILENO && fd != STDERR_FILENO)
close(fd);
/* TODO: chroot() and/or chdir() here */
break;
default:
/* successfully exit from parent */
exit(0);
}
}
enum { CHILD_OK= 0, CHILD_NEED_RESPAWN, CHILD_EXIT_ANGEL };
static volatile sig_atomic_t child_status= CHILD_OK;
/*
Signal handler for SIGCHLD: reap child, analyze child exit status, and set
child_status appropriately.
*/
void reap_child(int __attribute__((unused)) signo)
{
int child_exit_status;
/* As we have only one child, no need to cycle waitpid */
if (waitpid(0, &child_exit_status, WNOHANG) > 0)
{
if (WIFSIGNALED(child_exit_status))
child_status= CHILD_NEED_RESPAWN;
else
/*
As reap_child is not called for SIGSTOP, we should be here only
if the child exited normally.
*/
child_status= CHILD_EXIT_ANGEL;
}
}
static volatile sig_atomic_t is_terminated= 0;
/*
Signal handler for terminate signals - SIGTERM, SIGHUP, SIGINT.
Set termination status and return.
(q) do we need to handle SIGQUIT?
*/
void terminate(int signo)
{
is_terminated= signo;
}
/*
Fork a child and monitor it.
User can explicitly kill the angel process with SIGTERM/SIGHUP/SIGINT.
Angel process will exit silently if mysqlmanager exits normally.
*/
static void angel()
{
/* install signal handlers */
sigset_t zeromask; // to sigsuspend in parent
struct sigaction sa_chld, sa_term;
struct sigaction sa_chld_out, sa_term_out, sa_int_out, sa_hup_out;
sigemptyset(&zeromask);
sigemptyset(&sa_chld.sa_mask);
sigemptyset(&sa_term.sa_mask);
sa_chld.sa_handler= reap_child;
sa_chld.sa_flags= SA_NOCLDSTOP;
sa_term.sa_handler= terminate;
sa_term.sa_flags= 0;
/* sigaction can fail only on wrong arguments */
sigaction(SIGCHLD, &sa_chld, &sa_chld_out);
sigaction(SIGTERM, &sa_term, &sa_term_out);
sigaction(SIGINT, &sa_term, &sa_int_out);
sigaction(SIGHUP, &sa_term, &sa_hup_out);
/* spawn a child */
spawn:
pid_t pid= fork();
switch (pid) {
case -1:
die("angel(): fork failed, %s", strerror(errno));
case 0: // child, success
/*
restore default actions for signals to let the manager work with
signals as he wishes
*/
sigaction(SIGCHLD, &sa_chld_out, 0);
sigaction(SIGTERM, &sa_term_out, 0);
sigaction(SIGINT, &sa_int_out, 0);
sigaction(SIGHUP, &sa_hup_out, 0);
/* Here we return to main, and fall into manager */
break;
default: // parent, success
pid= getpid(); /* Get our pid. */
log_info("Angel pid file: '%s'; PID: %d.",
(const char *) Options::Daemon::angel_pid_file_name,
(int) pid);
create_pid_file(Options::Daemon::angel_pid_file_name, pid);
while (child_status == CHILD_OK && is_terminated == 0)
sigsuspend(&zeromask);
if (is_terminated)
log_info("angel got signal %d, exiting", is_terminated);
else if (child_status == CHILD_NEED_RESPAWN)
{
child_status= CHILD_OK;
log_error("angel(): mysqlmanager exited abnormally: respawning...");
sleep(1); /* don't respawn too fast */
goto spawn;
}
/*
mysqlmanager successfully exited, let's silently evaporate
If we return to main we will fall into the manager functionality,
so let's simply exit().
*/
exit(0);
}
}
#endif