Texas Instruments matrix-gui-2.0 hacking -- execute_command.sh

#!/bin/sh

#Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ 
#
# 
# Redistribution and use in source and binary forms, with or without 
# modification, are permitted provided that the following conditions 
# are met:
#
# Redistributions of source code must retain the above copyright 
# notice, this list of conditions and the following disclaimer.
#
# Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the 
# documentation and/or other materials provided with the   
# distribution.
#
# Neither the name of Texas Instruments Incorporated nor the names of
# its contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

mkdir -p tmp                # 创建tmp目录
mkdir -p lock               # 创建lock目录

i=0

for item in "$@"            # 迭代传入的参数
do

  if [ $i -eq 0 ]
  then
      
    filename=$item          # 获取文件名
  fi
 
  if [ $i -eq 1 ] 
  then
        
    outputfilename=$item    # 获取输出文件名
  fi

  if [ $i -gt 1 ]
  then
    touch "lock/"$item      # 创建lock文件,这个好象是暗个随机生成的数字字符串

   fi
 i=`expr $i + 1`            # i++

done

echo "Filename:"$filename
echo "Output:"$outputfilename
# 1. 执行程序,程序会卡在这里?以下是run_script.php运行程序：
#   $script_link = $found_app["Exec"];
#   # strval(): 用于获取变量对应的字符串值
#   # rand(): 返回随机整数
#   $random_string = strval(rand());
#   $random_string .= strval(rand());
#   # addslashes(): 在指定的预定义字符前添加反斜杠
#   $script_command = "./execute_command.sh "".addslashes($script_link). "" ".$random_string.".txt ".$lock_list;
#   # 获取系统执行结果最后一行
#   # system()第二个参数：如果提供的return_var参数，则外部命令执行后的
#   # 返回状态将会被设置到此变量中
#   $last_line = system($script_command." > /dev/null 2>/dev/null & ", $retval);
# 2. 对于Qt应用程序，个人觉得这里还是堵塞 
eval $filename > "tmp/"$outputfilename 2>&1

#Using a more unique string to detect if the script is completed
# 这行文字重定向到tmp下的输出文件尾
echo "_?!!MATRIX_SCRIPT_COMPLETED!!?_" >> "tmp/"$outputfilename

# 清一下屏,没找到这条命令
refresh_screen &

i=0
for item in "$@"
do

  if [ $i -gt 1 ]
  then
    rm -f "lock/"$item          # 删除lock下的文件

   fi
 i=`expr $i + 1`                # i++

done

sleep 20
rm "tmp/"$outputfilename        # 删除tmp下的文件