c进程学习日志

#include<unistd.h>
#include<sys/types.h>
#include<pwd.h>
#include<stdio.h>
int main(int argc,char **argv)
{
    pid_t my_pid,parent_pid;
    pid_t te ;
    my_pid=getpid();
    parent_pid=getppid();
    printf("mypid is [%d]\t parentid is [%d]\n",my_pid,parent_pid);
    te =  fork();
    printf("*********begin*************\n");
    my_pid=getpid();
    parent_pid=getppid();
    printf("mypid is [%d]\t parentid is [%d]\t te is %d\n",my_pid,parent_pid,te);
    printf("*********end*************\n");
#if 0    
    te =  fork();
    my_pid=getpid(); 
    parent_pid=getppid(); 
    printf("mypid is [%d]\t parentid is [%d]\t te is %d\n",my_pid,parent_pid,te);
    getchar();
#endif

#include<unistd.h>
#include<sys/types.h>
#include<pwd.h>
#include<stdio.h>
int main(int argc,char **argv)
{
    pid_t my_pid,parent_pid;
    pid_t te ;
    my_pid=getpid();
    parent_pid=getppid();
    printf("mypid is [%d]\t parentid is [%d]\n",my_pid,parent_pid);
    te =  fork();
    printf("*********begin*************\n");
    my_pid=getpid();
    parent_pid=getppid();
    printf("mypid is [%d]\t parentid is [%d]\t te is %d\n",my_pid,parent_pid,te);
    printf("*********end*************\n");
#if 1    

    printf("*********2THbegin*************\n");
    te =  fork();
    my_pid=getpid(); 
    parent_pid=getppid(); 
    printf("mypid is [%d]\t parentid is [%d]\t te is %d\n",my_pid,parent_pid,te);

    printf("********2TH*end*************\n");
    getchar();
#endif








}

#include<unistd.h>
#include<sys/types.h>
#include<pwd.h>
#include<stdio.h>
int main(int argc,char **argv)
{
    pid_t my_pid,parent_pid;
    pid_t te ;
    static int count = 0;
    my_pid=getpid();
    parent_pid = getppid();
    int i = 0;
    const char *p = "/usr/lsrcc/dMF/main";
    for(i = 0;i < 2;++i){
        te =  fork();
        if(te < 0){
            printf("fork err!\n");
            return -1;
        }
        if(te > 0){

            printf("i is %i \nmypid is [%d]\t parentid is [%d]\t te is %d\n",i,my_pid,parent_pid,te);
            printf("this is PARENT\n");
            count++;
        }
        else if(0 == te){
            printf("i is %i\nmypid is [%d]\t parentid is [%d]\t te is %d\n",i,my_pid,parent_pid,te);
            printf("this is CHILD\n");
            count++;
            execlp(p,NULL);
        }

    }
    printf("count is %d\n",count);

}