编写一个多进程并发执行程序。父进程首先创建一个执行ls命令的子进程然后再创建一个执行ps命令的子进程，并控制 ps 命令总在 ls 命令之前执行。

#include<sys/types.h> #include<wait.h> #include<unistd.h> #include<signal.h> #include<stdio.h> #include<stdlib.h> typedef void(*sighandler_t)(int); void sigcat() {printf("No.%d Process continue\n",getpid()); } int main(int argc,char*argv[]) { int status_1,status_2;signal(SIGINT,(sighandler_t)sigcat);char *args1[]={"/bin/ls","-a",NULL};char *args2[]={"/bin/ps","-a",NULL};int pid1=fork();if(pid1<0){printf("Create Process fail\n");} if(pid1==0){printf("No.%d ls the child process starting\n",getpid());pause();printf("No.%d ls the child process waking\n",getpid());status_1=execve(args1[0],args1,NULL);exit(0);}else{printf("\nNo.%d Father Process starting\n",getpid());int pid2=fork();if(pid2>0){printf("No.%d ls pause\n",pid1);waitpid(pid2,&status_2,0);printf("No.%d ps over\n",pid2);printf("No.%d ls waking\n",pid1);kill(pid1,SIGINT);waitpid(pid1,&status_1,0);printf("No.%d ls over\n",pid1);printf("No.%d Father process over\n",getpid());exit(0); }if(pid2<0){printf("Process2 fails\n");}if(pid2==0){printf("No.%d ps starting\n ",getpid());status_2=execve(args2[0],args2,NULL); } }return 0; }

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