sigaction

引自：https://blog.csdn.net/qq_20853741/article/details/113547906

SIGPIPE

https://www.cnblogs.com/lit10050528/p/5116566.html

sem_init

引自：https://blog.csdn.net/qq_33527943/article/details/80457903

pthread_create

socketpair

转自：https://blog.csdn.net/wufuhuai/article/details/79747912

EAGAIN

转自：https://www.cnblogs.com/big-xuyue/p/3905597.html