fork笔记

frenchleaf

#include <sys/types.h>#include <unistd.h>#include <stdio.h>#include <stdlib.h>int main(void){pid_t result;result=fork();if(result==-1){//perrer("fork");exit;}else if(result==0){printf("result=%d,ppid=%d,pid=%d\n",result,getppid(),getpid());}else{printf("result=%d,ppid=%d,pid=%d\n",result,getppid(),getpid());}}

#include <sys/types.h>#include <unistd.h>#include <stdio.h>#include <stdlib.h>int main(void){pid_t result;result=fork();if(result==-1){//perrer("fork");exit;}else if(result==0){printf("result=%d,ppid=%d,pid=%d\n",result,getppid(),getpid());if(execlp("ps","ps","-ef",NULL)<0){printf("error");exit;}}else{printf("result=%d,ppid=%d,pid=%d\n",result,getppid(),getpid());}}