code:ipc - ikarishinjieva/unixV6-code-analyze-chs GitHub Wiki
- 全局变量，用于跟踪系统进程间传递参数
3924
3925 /*
3926 * Tracing variables.
3927 * Used to pass trace command from
3928 * parent to child being traced.
3929 * This data base cannot be
3930 * shared and is locked
3931 * per user.
3932 */
3933 struct
3934 {
3935 int ip_lock;
3936 int ip_req;
- ipc 的锁变量
- 进程 锁 ipc，置此值为进程号n
3937 int ip_addr;
3938 int ip_data;
3939 } ipc;
3940 /* ------------------------- */