山东大学软件学院_操作系统实验1

/* Author: KMDJ PublishedOn: CSDN Filename: exp1.c */ #include "exp1.h" int main(int argc, char *argv[]){ int i; int pid1; int pid2; int status1; int status2; char *arg1[] = {"/bin/ls", "-a", NULL}; char *arg2[] = {"/bin/ps", "-l", NULL}; signal(SIGINT,(sighandler_t)sigcat); pid1=fork(); if(pid1<0){ printf("Create Process failed!\n"); exit(EXIT_FAILURE); } if(pid1==0){ printf("I am Child process %d\nMy father is %d\nI will execute command 'ls -a' later\n", getpid(), getppid()); printf("\n"); pause(); printf("%d child will Running: \n", getpid()); for(i=0; arg1[i]!=NULL; i++) printf("%s", arg1[i]); printf("\n"); status1=execve(arg1[0], arg1, NULL); } else{ sleep(1); pid2=fork(); if(pid2==0){ printf("I am Child process %d\nMy father is %d\nI will execute command 'ps -l' later\n", getpid(), getppid()); printf("\n"); pause(); printf("%d child will Running: \n", getpid()); for(i=0; arg2[i]!=NULL; i++) printf("%s", arg2[i]); printf("\n"); printf("\n"); status2=execve(arg2[0], arg2, NULL); } else{ sleep(1); printf("\nI am Parent process %d\n", getpid()); if(kill(pid2,SIGINT)>=0) printf("\n%d wakeup %d child.\n", getpid(), pid2); printf("%d wait for child done.\n", getpid()); waitpid(pid2, &status1, 0); printf("%d child process done.\n", pid2); if(kill(pid1,SIGINT)>=0) printf("\n%d wakeup %d child.\n", getpid(), pid1); printf("%d wait for child done.\n", getpid()); waitpid(pid1, &status1, 0); printf("%d child process done.\n", pid1); printf("\nParent process done\n"); } } return EXIT_SUCCESS; }