signal的处理(kill命令)以及一些其他的改进 #100
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del: 删除sighand_struct的wqh, 待将来有需要时，替换成rust版本的
bugfix: 解决拷贝sighand时的uaf问题
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暂时不支持用户程序注册自定义的sighandler,且只支持kill信号的默认处理方法.
更改如下
测试方法
1.在DragonOS的控制台输入
exec bin/test_signal.elf &.请注意,一定要输入末尾的&,否则进程不会后台运行2.然后kill对应的进程的pid (上一条命令执行后,将会输出这样一行:
[1] 生成的pid)