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mariadb/scripts/mysqld_safe.sh
Sergei Golubchik d3935adf7a mysql-5.5.29 merge
2013-01-15 19:13:32 +01:00

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#!/bin/sh
# Copyright Abandoned 1996 TCX DataKonsult AB & Monty Program KB & Detron HB
# This file is public domain and comes with NO WARRANTY of any kind
#
# Script to start the MySQL daemon and restart it if it dies unexpectedly
#
# This should be executed in the MySQL base directory if you are using a
# binary installation that is not installed in its compile-time default
# location
#
# mysql.server works by first doing a cd to the base directory and from there
# executing mysqld_safe
# Initialize script globals
KILL_MYSQLD=1;
MYSQLD=
niceness=0
nowatch=0
mysqld_ld_preload=
mysqld_ld_library_path=
# Initial logging status: error log is not open, and not using syslog
logging=init
want_syslog=0
syslog_tag=
user='@MYSQLD_USER@'
pid_file=
err_log=
syslog_tag_mysqld=mysqld
syslog_tag_mysqld_safe=mysqld_safe
trap '' 1 2 3 15 # we shouldn't let anyone kill us
# MySQL-specific environment variable. First off, it's not really a umask,
# it's the desired mode. Second, it follows umask(2), not umask(3) in that
# octal needs to be explicit. Our shell might be a proper sh without printf,
# multiple-base arithmetic, and binary arithmetic, so this will get ugly.
# We reject decimal values to keep things at least half-sane.
umask 007 # fallback
UMASK="${UMASK-0640}"
fmode=`echo "$UMASK" | sed -e 's/[^0246]//g'`
octalp=`echo "$fmode"|cut -c1`
fmlen=`echo "$fmode"|wc -c|sed -e 's/ //g'`
if [ "x$octalp" != "x0" -o "x$UMASK" != "x$fmode" -o "x$fmlen" != "x5" ]
then
fmode=0640
echo "UMASK must be a 3-digit mode with an additional leading 0 to indicate octal." >&2
echo "The first digit will be corrected to 6, the others may be 0, 2, 4, or 6." >&2
fi
fmode=`echo "$fmode"|cut -c3-4`
fmode="6$fmode"
if [ "x$UMASK" != "x0$fmode" ]
then
echo "UMASK corrected from $UMASK to 0$fmode ..."
fi
defaults=
case "$1" in
--no-defaults|--defaults-file=*|--defaults-extra-file=*)
defaults="$1"; shift
;;
esac
usage () {
cat <<EOF
Usage: $0 [OPTIONS]
--no-defaults Don't read the system defaults file
--core-file-size=LIMIT Limit core files to the specified size
--defaults-file=FILE Use the specified defaults file
--defaults-extra-file=FILE Also use defaults from the specified file
--ledir=DIRECTORY Look for mysqld in the specified directory
--open-files-limit=LIMIT Limit the number of open files
--timezone=TZ Set the system timezone
--malloc-lib=LIB Preload shared library LIB if available
--mysqld=FILE Use the specified file as mysqld
--mysqld-version=VERSION Use "mysqld-VERSION" as mysqld
--nice=NICE Set the scheduling priority of mysqld
--no-auto-restart Exit after starting mysqld
--nowatch Exit after starting mysqld
--plugin-dir=DIR Plugins are under DIR or DIR/VERSION, if
VERSION is given
--skip-kill-mysqld Don't try to kill stray mysqld processes
--syslog Log messages to syslog with 'logger'
--skip-syslog Log messages to error log (default)
--syslog-tag=TAG Pass -t "mysqld-TAG" to 'logger'
All other options are passed to the mysqld program.
EOF
exit 1
}
my_which ()
{
save_ifs="${IFS-UNSET}"
IFS=:
ret=0
for file
do
for dir in $PATH
do
if [ -f "$dir/$file" ]
then
echo "$dir/$file"
continue 2
fi
done
ret=1 #signal an error
break
done
if [ "$save_ifs" = UNSET ]
then
unset IFS
else
IFS="$save_ifs"
fi
return $ret # Success
}
log_generic () {
priority="$1"
shift
msg="`date +'%y%m%d %H:%M:%S'` mysqld_safe $*"
echo "$msg"
case $logging in
init) ;; # Just echo the message, don't save it anywhere
file) echo "$msg" >> "$err_log" ;;
syslog) logger -t "$syslog_tag_mysqld_safe" -p "$priority" "$*" ;;
*)
echo "Internal program error (non-fatal):" \
" unknown logging method '$logging'" >&2
;;
esac
}
log_error () {
log_generic daemon.error "$@" >&2
}
log_notice () {
log_generic daemon.notice "$@"
}
eval_log_error () {
cmd="$1"
case $logging in
file) cmd="$cmd >> "`shell_quote_string "$err_log"`" 2>&1" ;;
syslog)
# mysqld often prefixes its messages with a timestamp, which is
# redundant when logging to syslog (which adds its own timestamp)
# However, we don't strip the timestamp with sed here, because
# sed buffers output (only GNU sed supports a -u (unbuffered) option)
# which means that messages may not get sent to syslog until the
# mysqld process quits.
cmd="$cmd 2>&1 | logger -t '$syslog_tag_mysqld' -p daemon.error"
;;
*)
echo "Internal program error (non-fatal):" \
" unknown logging method '$logging'" >&2
;;
esac
if test $nowatch -eq 1
then
# We'd prefer to exec $cmd here, but SELinux needs to be fixed first
#/usr/bin/logger "Running mysqld: $cmd"
eval "$cmd &"
exit 0
else
#echo "Running mysqld: [$cmd]"
eval "$cmd"
fi
}
shell_quote_string() {
# This sed command makes sure that any special chars are quoted,
# so the arg gets passed exactly to the server.
echo "$1" | sed -e 's,\([^a-zA-Z0-9/_.=-]\),\\\1,g'
}
parse_arguments() {
# We only need to pass arguments through to the server if we don't
# handle them here. So, we collect unrecognized options (passed on
# the command line) into the args variable.
pick_args=
if test "$1" = PICK-ARGS-FROM-ARGV
then
pick_args=1
shift
fi
for arg do
# the parameter after "=", or the whole $arg if no match
val=`echo "$arg" | sed -e 's;^--[^=]*=;;'`
# what's before "=", or the whole $arg if no match
optname=`echo "$arg" | sed -e 's/^\(--[^=]*\)=.*$/\1/'`
# replace "_" by "-" ; mysqld_safe must accept "_" like mysqld does.
optname_subst=`echo "$optname" | sed 's/_/-/g'`
arg=`echo $arg | sed "s/^$optname/$optname_subst/"`
case "$arg" in
# these get passed explicitly to mysqld
--basedir=*) MY_BASEDIR_VERSION="$val" ;;
--datadir=*|--data=*) DATADIR="$val" ;;
--pid-file=*) pid_file="$val" ;;
--plugin-dir=*) PLUGIN_DIR="$val" ;;
--user=*) user="$val"; SET_USER=1 ;;
--log-basename=*|--hostname=*|--loose-log-basename=*)
pid_file="$val.pid";
err_log="$val.err";
;;
# these might have been set in a [mysqld_safe] section of my.cnf
# they are added to mysqld command line to override settings from my.cnf
--log-error=*) err_log="$val" ;;
--port=*) mysql_tcp_port="$val" ;;
--socket=*) mysql_unix_port="$val" ;;
# mysqld_safe-specific options - must be set in my.cnf ([mysqld_safe])!
--core-file-size=*) core_file_size="$val" ;;
--ledir=*) ledir="$val" ;;
--malloc-lib=*) set_malloc_lib "$val" ;;
--mysqld=*) MYSQLD="$val" ;;
--mysqld-version=*)
if test -n "$val"
then
MYSQLD="mysqld-$val"
PLUGIN_VARIANT="/$val"
else
MYSQLD="mysqld"
fi
;;
--nice=*) niceness="$val" ;;
--nowatch|--no-watch|--no-auto-restart) nowatch=1 ;;
--open-files-limit=*) open_files="$val" ;;
--open_files_limit=*) open_files="$val" ;;
--skip-kill-mysqld*) KILL_MYSQLD=0 ;;
--syslog) want_syslog=1 ;;
--skip-syslog) want_syslog=0 ;;
--syslog-tag=*) syslog_tag="$val" ;;
--timezone=*) TZ="$val"; export TZ; ;;
--help) usage ;;
*)
if test -n "$pick_args"
then
append_arg_to_args "$arg"
fi
;;
esac
done
}
# Add a single shared library to the list of libraries which will be added to
# LD_PRELOAD for mysqld
#
# Since LD_PRELOAD is a space-separated value (for historical reasons), if a
# shared lib's path contains spaces, that path will be prepended to
# LD_LIBRARY_PATH and stripped from the lib value.
add_mysqld_ld_preload() {
lib_to_add="$1"
log_notice "Adding '$lib_to_add' to LD_PRELOAD for mysqld"
case "$lib_to_add" in
*' '*)
# Must strip path from lib, and add it to LD_LIBRARY_PATH
lib_file=`basename "$lib_to_add"`
case "$lib_file" in
*' '*)
# The lib file itself has a space in its name, and can't
# be used in LD_PRELOAD
log_error "library name '$lib_to_add' contains spaces and can not be used with LD_PRELOAD"
exit 1
;;
esac
lib_path=`dirname "$lib_to_add"`
lib_to_add="$lib_file"
[ -n "$mysqld_ld_library_path" ] && mysqld_ld_library_path="$mysqld_ld_library_path:"
mysqld_ld_library_path="$mysqld_ld_library_path$lib_path"
;;
esac
# LD_PRELOAD is a space-separated
[ -n "$mysqld_ld_preload" ] && mysqld_ld_preload="$mysqld_ld_preload "
mysqld_ld_preload="${mysqld_ld_preload}$lib_to_add"
}
# Returns LD_PRELOAD (and LD_LIBRARY_PATH, if needed) text, quoted to be
# suitable for use in the eval that calls mysqld.
#
# All values in mysqld_ld_preload are prepended to LD_PRELOAD.
mysqld_ld_preload_text() {
text=
if [ -n "$mysqld_ld_preload" ]; then
new_text="$mysqld_ld_preload"
[ -n "$LD_PRELOAD" ] && new_text="$new_text $LD_PRELOAD"
text="${text}LD_PRELOAD="`shell_quote_string "$new_text"`' '
fi
if [ -n "$mysqld_ld_library_path" ]; then
new_text="$mysqld_ld_library_path"
[ -n "$LD_LIBRARY_PATH" ] && new_text="$new_text:$LD_LIBRARY_PATH"
text="${text}LD_LIBRARY_PATH="`shell_quote_string "$new_text"`' '
fi
echo "$text"
}
mysql_config=
get_mysql_config() {
if [ -z "$mysql_config" ]; then
mysql_config=`echo "$0" | sed 's,/[^/][^/]*$,/mysql_config,'`
if [ ! -x "$mysql_config" ]; then
log_error "Can not run mysql_config $@ from '$mysql_config'"
exit 1
fi
fi
"$mysql_config" "$@"
}
# set_malloc_lib LIB
# - If LIB is empty, do nothing and return
# - If LIB is 'tcmalloc', look for tcmalloc shared library in /usr/lib
# then pkglibdir. tcmalloc is part of the Google perftools project.
# - If LIB is an absolute path, assume it is a malloc shared library
#
# Put LIB in mysqld_ld_preload, which will be added to LD_PRELOAD when
# running mysqld. See ld.so for details.
set_malloc_lib() {
malloc_lib="$1"
if [ "$malloc_lib" = tcmalloc ]; then
pkglibdir=`get_mysql_config --variable=pkglibdir`
malloc_lib=
# This list is kept intentionally simple. Simply set --malloc-lib
# to a full path if another location is desired.
for libdir in /usr/lib "$pkglibdir" "$pkglibdir/mysql"; do
for flavor in _minimal '' _and_profiler _debug; do
tmp="$libdir/libtcmalloc$flavor.so"
#log_notice "DEBUG: Checking for malloc lib '$tmp'"
[ -r "$tmp" ] || continue
malloc_lib="$tmp"
break 2
done
done
if [ -z "$malloc_lib" ]; then
log_error "no shared library for --malloc-lib=tcmalloc found in /usr/lib or $pkglibdir"
exit 1
fi
fi
# Allow --malloc-lib='' to override other settings
[ -z "$malloc_lib" ] && return
case "$malloc_lib" in
/*)
if [ ! -r "$malloc_lib" ]; then
log_error "--malloc-lib '$malloc_lib' can not be read and will not be used"
exit 1
fi
;;
*)
log_error "--malloc-lib must be an absolute path or 'tcmalloc'; " \
"ignoring value '$malloc_lib'"
exit 1
;;
esac
add_mysqld_ld_preload "$malloc_lib"
}
#
# First, try to find BASEDIR and ledir (where mysqld is)
#
if echo '@pkgdatadir@' | grep '^@prefix@' > /dev/null
then
relpkgdata=`echo '@pkgdatadir@' | sed -e 's,^@prefix@,,' -e 's,^/,,' -e 's,^,./,'`
else
# pkgdatadir is not relative to prefix
relpkgdata='@pkgdatadir@'
fi
MY_PWD=`pwd`
# Check for the directories we would expect from a binary release install
if test -n "$MY_BASEDIR_VERSION" -a -d "$MY_BASEDIR_VERSION"
then
# BASEDIR is already overridden on command line. Do not re-set.
# Use BASEDIR to discover le.
if test -x "$MY_BASEDIR_VERSION/libexec/mysqld"
then
ledir="$MY_BASEDIR_VERSION/libexec"
elif test -x "$MY_BASEDIR_VERSION/sbin/mysqld"
then
ledir="$MY_BASEDIR_VERSION/sbin"
else
ledir="$MY_BASEDIR_VERSION/bin"
fi
elif test -f "$relpkgdata"/english/errmsg.sys -a -x "$MY_PWD/bin/mysqld"
then
MY_BASEDIR_VERSION="$MY_PWD" # Where bin, share and data are
ledir="$MY_PWD/bin" # Where mysqld is
# Check for the directories we would expect from a source install
elif test -f "$relpkgdata"/english/errmsg.sys -a -x "$MY_PWD/libexec/mysqld"
then
MY_BASEDIR_VERSION="$MY_PWD" # Where libexec, share and var are
ledir="$MY_PWD/libexec" # Where mysqld is
elif test -f "$relpkgdata"/english/errmsg.sys -a -x "$MY_PWD/sbin/mysqld"
then
MY_BASEDIR_VERSION="$MY_PWD" # Where sbin, share and var are
ledir="$MY_PWD/sbin" # Where mysqld is
# Since we didn't find anything, used the compiled-in defaults
else
MY_BASEDIR_VERSION='@prefix@'
ledir='@libexecdir@'
fi
#
# Second, try to find the data directory
#
# Try where the binary installs put it
if test -d $MY_BASEDIR_VERSION/data/mysql
then
DATADIR=$MY_BASEDIR_VERSION/data
if test -z "$defaults" -a -r "$DATADIR/my.cnf"
then
defaults="--defaults-extra-file=$DATADIR/my.cnf"
fi
# Next try where the source installs put it
elif test -d $MY_BASEDIR_VERSION/var/mysql
then
DATADIR=$MY_BASEDIR_VERSION/var
# Or just give up and use our compiled-in default
else
DATADIR=@localstatedir@
fi
if test -z "$MYSQL_HOME"
then
if test -r "$MY_BASEDIR_VERSION/my.cnf" && test -r "$DATADIR/my.cnf"
then
log_error "WARNING: Found two instances of my.cnf -
$MY_BASEDIR_VERSION/my.cnf and
$DATADIR/my.cnf
IGNORING $DATADIR/my.cnf"
MYSQL_HOME=$MY_BASEDIR_VERSION
elif test -r "$DATADIR/my.cnf"
then
log_error "WARNING: Found $DATADIR/my.cnf
The data directory is a deprecated location for my.cnf, please move it to
$MY_BASEDIR_VERSION/my.cnf"
MYSQL_HOME=$DATADIR
else
MYSQL_HOME=$MY_BASEDIR_VERSION
fi
fi
export MYSQL_HOME
# Get first arguments from the my.cnf file, groups [mysqld] and [mysqld_safe]
# and then merge with the command line arguments
if test -x "$MY_BASEDIR_VERSION/bin/my_print_defaults"
then
print_defaults="$MY_BASEDIR_VERSION/bin/my_print_defaults"
elif test -x `dirname $0`/my_print_defaults
then
print_defaults="`dirname $0`/my_print_defaults"
elif test -x ./bin/my_print_defaults
then
print_defaults="./bin/my_print_defaults"
elif test -x @bindir@/my_print_defaults
then
print_defaults="@bindir@/my_print_defaults"
elif test -x @bindir@/mysql_print_defaults
then
print_defaults="@bindir@/mysql_print_defaults"
else
print_defaults="my_print_defaults"
fi
append_arg_to_args () {
args="$args "`shell_quote_string "$1"`
}
args=
SET_USER=2
parse_arguments `$print_defaults $defaults --loose-verbose mysqld mariadb server client-server`
if test $SET_USER -eq 2
then
SET_USER=0
fi
parse_arguments `$print_defaults $defaults --loose-verbose mysqld_safe safe_mysqld`
parse_arguments PICK-ARGS-FROM-ARGV "$@"
#
# Try to find the plugin directory
#
# Use user-supplied argument
if [ -n "${PLUGIN_DIR}" ]; then
plugin_dir="${PLUGIN_DIR}"
else
# Try to find plugin dir relative to basedir
for dir in lib/mysql/plugin lib/plugin
do
if [ -d "${MY_BASEDIR_VERSION}/${dir}" ]; then
plugin_dir="${MY_BASEDIR_VERSION}/${dir}"
break
fi
done
# Give up and use compiled-in default
if [ -z "${plugin_dir}" ]; then
plugin_dir='@pkgplugindir@'
fi
fi
plugin_dir="${plugin_dir}${PLUGIN_VARIANT}"
# Determine what logging facility to use
# Ensure that 'logger' exists, if it's requested
if [ $want_syslog -eq 1 ]
then
my_which logger > /dev/null 2>&1
if [ $? -ne 0 ]
then
log_error "--syslog requested, but no 'logger' program found. Please ensure that 'logger' is in your PATH, or do not specify the --syslog option to mysqld_safe."
exit 1
fi
fi
if [ -n "$err_log" -o $want_syslog -eq 0 ]
then
if [ -n "$err_log" ]
then
# mysqld adds ".err" if there is no extension on the --log-error
# argument; must match that here, or mysqld_safe will write to a
# different log file than mysqld
# mysqld does not add ".err" to "--log-error=foo."; it considers a
# trailing "." as an extension
if expr "$err_log" : '.*\.[^/]*$' > /dev/null
then
:
else
err_log="$err_log".err
fi
case "$err_log" in
/* ) ;;
* ) err_log="$DATADIR/$err_log" ;;
esac
else
err_log=$DATADIR/`@HOSTNAME@`.err
fi
append_arg_to_args "--log-error=$err_log"
if [ $want_syslog -eq 1 ]
then
# User explicitly asked for syslog, so warn that it isn't used
log_error "Can't log to error log and syslog at the same time. Remove all --log-error configuration options for --syslog to take effect."
fi
# Log to err_log file
log_notice "Logging to '$err_log'."
logging=file
if [ ! -e "$err_log" ]; then # if error log already exists,
touch "$err_log" # we just append. otherwise,
chmod "$fmode" "$err_log" # fix the permissions here!
fi
else
if [ -n "$syslog_tag" ]
then
# Sanitize the syslog tag
syslog_tag=`echo "$syslog_tag" | sed -e 's/[^a-zA-Z0-9_-]/_/g'`
syslog_tag_mysqld_safe="${syslog_tag_mysqld_safe}-$syslog_tag"
syslog_tag_mysqld="${syslog_tag_mysqld}-$syslog_tag"
fi
log_notice "Logging to syslog."
logging=syslog
fi
USER_OPTION=""
if test -w / -o "$USER" = "root"
then
if test "$user" != "root" -o $SET_USER = 1
then
USER_OPTION="--user=$user"
fi
# Change the err log to the right user, if it is in use
if [ $want_syslog -eq 0 ]; then
touch "$err_log"
chown $user "$err_log"
fi
if test -n "$open_files"
then
ulimit -n $open_files
fi
fi
if test -n "$open_files"
then
append_arg_to_args "--open-files-limit=$open_files"
fi
safe_mysql_unix_port=${mysql_unix_port:-${MYSQL_UNIX_PORT:-@MYSQL_UNIX_ADDR@}}
# Make sure that directory for $safe_mysql_unix_port exists
mysql_unix_port_dir=`dirname $safe_mysql_unix_port`
if [ ! -d $mysql_unix_port_dir ]
then
if ! `mkdir -p $mysql_unix_port_dir`
then
echo "Fatal error Can't create database directory '$mysql_unix_port'"
exit 1
fi
chown $user $mysql_unix_port_dir
chmod 755 $mysql_unix_port_dir
fi
# If the user doesn't specify a binary, we assume name "mysqld"
if test -z "$MYSQLD"
then
MYSQLD=mysqld
fi
if test ! -x "$ledir/$MYSQLD"
then
log_error "The file $ledir/$MYSQLD
does not exist or is not executable. Please cd to the mysql installation
directory and restart this script from there as follows:
./bin/mysqld_safe&
See http://dev.mysql.com/doc/mysql/en/mysqld-safe.html for more information"
exit 1
fi
if test -z "$pid_file"
then
pid_file="`@HOSTNAME@`.pid"
fi
# MariaDB wants pid file without datadir
append_arg_to_args "--pid-file=$pid_file"
case "$pid_file" in
/* ) ;;
* ) pid_file="$DATADIR/$pid_file" ;;
esac
if test -n "$mysql_unix_port"
then
append_arg_to_args "--socket=$mysql_unix_port"
fi
if test -n "$mysql_tcp_port"
then
append_arg_to_args "--port=$mysql_tcp_port"
fi
if test $niceness -eq 0
then
NOHUP_NICENESS="nohup"
else
NOHUP_NICENESS="nohup nice -$niceness"
fi
# Using nice with no args to get the niceness level is GNU-specific.
# This check could be extended for other operating systems (e.g.,
# BSD could use "nohup sh -c 'ps -o nice -p $$' | tail -1").
# But, it also seems that GNU nohup is the only one which messes
# with the priority, so this is okay.
if nohup nice > /dev/null 2>&1
then
normal_niceness=`nice`
nohup_niceness=`nohup nice 2>/dev/null`
numeric_nice_values=1
for val in $normal_niceness $nohup_niceness
do
case "$val" in
-[0-9] | -[0-9][0-9] | -[0-9][0-9][0-9] | \
[0-9] | [0-9][0-9] | [0-9][0-9][0-9] )
;;
* )
numeric_nice_values=0 ;;
esac
done
if test $numeric_nice_values -eq 1
then
nice_value_diff=`expr $nohup_niceness - $normal_niceness`
if test $? -eq 0 && test $nice_value_diff -gt 0 && \
nice --$nice_value_diff echo testing > /dev/null 2>&1
then
# nohup increases the priority (bad), and we are permitted
# to lower the priority with respect to the value the user
# might have been given
niceness=`expr $niceness - $nice_value_diff`
NOHUP_NICENESS="nice -$niceness nohup"
fi
fi
else
if nohup echo testing > /dev/null 2>&1
then
:
else
# nohup doesn't work on this system
NOHUP_NICENESS=""
fi
fi
# Try to set the core file size (even if we aren't root) because many systems
# don't specify a hard limit on core file size.
if test -n "$core_file_size"
then
ulimit -c $core_file_size
fi
#
# If there exists an old pid file, check if the daemon is already running
# Note: The switches to 'ps' may depend on your operating system
if test -f "$pid_file"
then
PID=`cat "$pid_file"`
if @CHECK_PID@
then
if @FIND_PROC@
then # The pid contains a mysqld process
log_error "A mysqld process already exists"
exit 1
fi
fi
rm -f "$pid_file"
if test -f "$pid_file"
then
log_error "Fatal error: Can't remove the pid file:
$pid_file
Please remove it manually and start $0 again;
mysqld daemon not started"
exit 1
fi
fi
#
# Uncomment the following lines if you want all tables to be automatically
# checked and repaired during startup. You should add sensible key_buffer
# and sort_buffer values to my.cnf to improve check performance or require
# less disk space.
# Alternatively, you can start mysqld with the "myisam-recover" option. See
# the manual for details.
#
# echo "Checking tables in $DATADIR"
# $MY_BASEDIR_VERSION/bin/myisamchk --silent --force --fast --medium-check $DATADIR/*/*.MYI
# $MY_BASEDIR_VERSION/bin/isamchk --silent --force $DATADIR/*/*.ISM
# Does this work on all systems?
#if type ulimit | grep "shell builtin" > /dev/null
#then
# ulimit -n 256 > /dev/null 2>&1 # Fix for BSD and FreeBSD systems
#fi
cmd="`mysqld_ld_preload_text`$NOHUP_NICENESS"
for i in "$ledir/$MYSQLD" "$defaults" "--basedir=$MY_BASEDIR_VERSION" \
"--datadir=$DATADIR" "--plugin-dir=$plugin_dir" "$USER_OPTION"
do
cmd="$cmd "`shell_quote_string "$i"`
done
cmd="$cmd $args"
# Avoid 'nohup: ignoring input' warning
test -n "$NOHUP_NICENESS" && cmd="$cmd < /dev/null"
log_notice "Starting $MYSQLD daemon with databases from $DATADIR"
# variable to track the current number of "fast" (a.k.a. subsecond) restarts
fast_restart=0
# maximum number of restarts before trottling kicks in
max_fast_restarts=5
# flag whether a usable sleep command exists
have_sleep=1
while true
do
rm -f $safe_mysql_unix_port "$pid_file" # Some extra safety
start_time=`date +%M%S`
eval_log_error "$cmd"
if [ $want_syslog -eq 0 -a ! -e "$err_log" ]; then
touch "$err_log" # hypothetical: log was renamed but not
chown $user "$err_log" # flushed yet. we'd recreate it with
chmod "$fmode" "$err_log" # wrong owner next time we log, so set
fi # it up correctly while we can!
end_time=`date +%M%S`
if test ! -f "$pid_file" # This is removed if normal shutdown
then
break
fi
# sanity check if time reading is sane and there's sleep
if test $end_time -gt 0 -a $have_sleep -gt 0
then
# throttle down the fast restarts
if test $end_time -eq $start_time
then
fast_restart=`expr $fast_restart + 1`
if test $fast_restart -ge $max_fast_restarts
then
log_notice "The server is respawning too fast. Sleeping for 1 second."
sleep 1
sleep_state=$?
if test $sleep_state -gt 0
then
log_notice "The server is respawning too fast and no working sleep command. Turning off trottling."
have_sleep=0
fi
fast_restart=0
fi
else
fast_restart=0
fi
fi
if @TARGET_LINUX@ && test $KILL_MYSQLD -eq 1
then
# Test if one process was hanging.
# This is only a fix for Linux (running as base 3 mysqld processes)
# but should work for the rest of the servers.
# The only thing is ps x => redhat 5 gives warnings when using ps -x.
# kill -9 is used or the process won't react on the kill.
numofproces=`ps xaww | grep -v "grep" | grep "$ledir/$MYSQLD\>" | grep -c "pid-file=$pid_file"`
log_notice "Number of processes running now: $numofproces"
I=1
while test "$I" -le "$numofproces"
do
PROC=`ps xaww | grep "$ledir/$MYSQLD\>" | grep -v "grep" | grep "pid-file=$pid_file" | sed -n '$p'`
for T in $PROC
do
break
done
# echo "TEST $I - $T **"
if kill -9 $T
then
log_error "$MYSQLD process hanging, pid $T - killed"
else
break
fi
I=`expr $I + 1`
done
fi
log_notice "mysqld restarted"
done
log_notice "mysqld from pid file $pid_file ended"
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