我有一个简单的服务器，它为新的套接字连接做fork。
如果我在调用signal(SIGCHLD, SIG_IGN);时设置system()以避免僵尸
在子进程中执行所需的脚本 - 一切都执行得很好，但似乎孩子在退出之前从进程表中删除，所以很奇怪。以下是输出示例：
server started. version 0.20
opening socket
binding
listening
parent process does nothing
client message: print.php
executing php script: "print.php"
full command line of execution: "php print.php" <-- we call system() which executes php script on server
Hello, World! <-- this is output of php script
return value from script execution: -1 <-- should be ok but -1 instead
system returns -1 error: No child processes
child is closing socket