Description: Linux software interrupt communications. By the parent process creates two sub-processes, through the terminal input Crtl+ \ key combination to the parent process sends SIGQUIT soft interrupt signal generated by the system clock or soft interrupt SIGALRM signal is sent to the parent process parent process receives one of these two soft interrupt one After two sub-processes are sent to its integer value of 16 and 17 soft interrupt signal, the child process to obtain the corresponding soft interrupt signal, terminate the operation parent process calls wait () function to wait two child process terminates, then the self-termination.
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