司机和售票员问题 信号signal注册一例

 

 

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>pid_t pid;void driver_handler(int signo)  //司机的信号处理函数
{if (signo == SIGUSR1)printf("Let's go!\n");if (signo == SIGUSR2)printf("Stop the bus!\n");if (signo == SIGTSTP)kill(pid, SIGUSR1);
}void conductor_handler(int signo)  //售票员的信号处理函数
{if (signo == SIGINT)kill(getppid(), SIGUSR1);if (signo == SIGQUIT)kill(getppid(), SIGUSR2);if (signo == SIGUSR1){printf("Please get off the bus!\n");kill(getppid(), SIGKILL);exit(0);}
}int main()
{if ((pid = fork()) == -1){perror("fork");exit(-1);}if (pid == 0)//conductor{signal(SIGINT,conductor_handler);signal(SIGQUIT,conductor_handler);signal(SIGUSR1,conductor_handler);signal(SIGTSTP, SIG_IGN);}else//driver{signal(SIGUSR1, driver_handler);signal(SIGUSR2, driver_handler);signal(SIGTSTP, driver_handler);signal(SIGINT,SIG_IGN);signal(SIGQUIT,SIG_IGN);}while (1);return 0;
}