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这篇文章是上一篇博客的后续分析，主要介绍向init进程发送热拔插信息后init进程的处理流程

首先我们来了解一个数据结构，uevent，如下

struct uevent {                                                                                

    const char *action;                                                                        

    const char *path;                                                                          

    const char *subsystem;                                                                     

    const char *firmware;                                                                      

    int major;                                                                                 

    int minor;                                                                                 

};  

static void parse_event(const char *msg, struct uevent *uevent) 

{

 

    while(*msg) {                                                                              

        if(!strncmp(msg, "ACTION=", 7)) {                                                      

            msg += 7;                                                                          

            uevent->action = msg;                                                              

        } else if(!strncmp(msg, "DEVPATH=", 8)) {                                              

            msg += 8;                                                                          

            uevent->path = msg;                                                                

        } else if(!strncmp(msg, "SUBSYSTEM=", 10)) {                                           

            msg += 10;                                                                         

            uevent->subsystem = msg;                                                           

        } else if(!strncmp(msg, "FIRMWARE=", 9)) {                                             

            msg += 9;                                                                          

            uevent->firmware = msg;                                                            

        } else if(!strncmp(msg, "MAJOR=", 6)) {                                                

            msg += 6;                                                                          

            uevent->major = atoi(msg);                                                         

        } else if(!strncmp(msg, "MINOR=", 6)) {                                                

            msg += 6;                                                                          

            uevent->minor = atoi(msg);                                                         

        }

         while(*msg++)；

    }           

}

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