使用getrlimit控制进程使用系统CPU

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <sys/resource.h>#include <signal.h>void sigxcpu_handler(int signum){printf ("SIGXCPU Received!\n");//可以在这里就退出进程 exit(1);}void sigkill_handler(int signum){printf ("SIGKILL received!\n");}int main(void){signal(SIGXCPU, sigxcpu_handler);//无效的,kill信号不允许自定义signal(SIGKILL, sigkill_handler);struct rlimit rl;int ret = getrlimit (RLIMIT_CPU, &rl);if (ret == -1){printf("Failed to getrlimit!\n");exit(-1);}//进程使用cpu时间达到rlim_cur时，操作系统向进程发送SIGXCPU信号，如果进程未终止，则之后每秒发送一次rl.rlim_cur = 1;//进程使用CPU时间达到rlim_max时，操作系统向进程发送SIGKILL信号，终止进程rl.rlim_max = 5;ret = setrlimit (RLIMIT_CPU, &rl);if (ret == -1){printf("Failed to set limit.\n");exit(-1);}while (1);return 0;}