Myexec(linux).txt

#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>

int main()
{
        pid_t id=fork();
        if(id==0)
        {//child
            printf("i am child my id is: %d\n",getpid());
        //int ret=execlp("ls","ls","-a","-l","-n",NULL);

                char* argv[]={ "ls","-a","-l","-n",NULL};

        int ret = execv("/bin/ls",argv);
         // printf("i am child my id:%d\n",getpid());
                if(ret==-1)
                {
                        perror("execerror!\n");
                        exit(1);
                }
                exit(0);
        }
        else
        {//father
           pid_t ret=wait(NULL);
           if(ret>0)
           {
                   printf("child exit success! id:%d\n",ret);
                   printf("my child pid is:%d\n",id);
           }
        }
  return 0;
}