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通过SIGCHLD 信号进行子进程监听并重启该进程示例

  1. Achieved: a. 父进程监听子进程,如果子进程退出则重启这个子进程; b. 子进程监听父进程,如果父进程退出则子进程也一并被回收;

TODO: a. 该示例中还需要考虑,多子进程情况; b. signal处理函数重入的问题,当多个信号到来重入时需要保存当前errno;

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