AIX，子进程退出时，父进程无法捕获SIGCHLD

Question

我的父进程无法捕获SIGCHLD，即使它在waitpid（SIGCHLD ...）上也是如此。尝试从孩子给父进程一个明确的kill（SIGCHLD ..）以测试父进程没有收到信号。风味是AIX ...我们需要用一些标志或一些环境设置来编译它吗？

Answer 1

You need to register a signal handler to catch SIGCHLD. waitpid is related but different from SIGCHLD. Use either signal(3) or sigaction(2) to register your signal handler.

To use waitpid do:

pid_t x = fork();
...
pid_t y = waitpid(x, &status, options);

SIGCHLD really just tells you that you need to call one of the wait functions.