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最新推荐文章于 2022-03-23 22:45:20 发布

原创最新推荐文章于 2022-03-23 22:45:20 发布 · 621 阅读

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CC 4.0 BY-SA版权

文章标签：

#server #buffer #socket #function #path

本文介绍了一个用于控制SI-net接收守护进程的bash脚本。该脚本包括启动、停止和重启守护进程的功能，并检查了离线状态及必要的目录和锁文件的存在情况。

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A contrl script puzzled me lots days. Today I finally got a correct version.

#!/bin/bash
#
# sinetrecvctl      SI-net receiver damon control script
#
# description: SI-net receiver daemon is SI-net communication proccess.

### Source function library.
if [ -f /etc/rc.d/init.d/functions ] ; then
. /etc/rc.d/init.d/functions
else
. /etc/init.d/functions
fi

SERVER=/usr/local/sbin/sinetrecv
SERVER_NAME=sinetrecv
CHECK_PROG=/usr/local/sbin/sinetrecv_check.sh
CHECK_PROG_NAME=sinetrecv_check.sh
prog="$SERVER"

RETVAL=0

umask 077

start() {
# check the existance of offline file.
if [ ! -f /tmp/online ]; then
echo "sinetrecv: This is off-line mode."
return 0
        fi

# make directory for socket path file.
if [ ! -d /tmp/bws ] ; then
mkdir /tmp/bws
fi
if [ ! -d /tmp/bws/socket ] ; then
mkdir /tmp/bws/socket
fi

# check the existance of the lock file.
if [ -f /var/lock/subsys/sinetrecv ]; then
echo "sinetrecv already exists."
else
echo -n $"Starting $prog: "
$prog &
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && touch /var/lock/subsys/sinetrecv
$CHECK_PROG &
fi

        return $RETVAL
}
stop() {
echo -n $"Shutting down $CHECK_PROG: "
killall $CHECK_PROG_NAME
        RETVAL=$?
echo
#[ $RETVAL -eq 0 ] && rm -f /tmp/sinetrecv_check.lock
rm -f /tmp/sinetrecv_check.lock
echo -n $"Shutting down $prog: "
killall sleep
killall $SERVER_NAME
RETVAL=$?
#echo
#[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/sinetrecv
rm -f /var/lock/subsys/sinetrecv
return $RETVAL
}
restart() {
stop
start
}

case "$1" in
start)
start
;;
stop)
stop
;;
restart|reload)
restart
;;
*)
echo $"Usage: $0 {start|stop|restart}"
exit 1
esac

exit $?

There is a trap in code.

if(shmid = shmget(GKCMN_COS_BUFFER_KEY, 0, 0666) >= 0){
...
}

The priority of "=" is lower than ">=", so the variable "shmid" get
the result of "shmget(GKCMN_COS_BUFFER_KEY, 0, 0666) >= 0". That is wrong!
So, this cause the following codes error.