linux进程控制开发实例-白红宇

linux进程控制开发实例

阅读量：7139 次

发布时间：2019-06-28

本文共 1677 字，大约阅读时间需要 5 分钟。

fork.c

#include 
     
      #include 
      
       #include 
       
        #include 
        
         int main(void){    pid_t result;        result = fork();        if (result == -1)    {        printf("Fork Error!\n");    }    else    {        if (result == 0)        {            printf("The returned value is %d\nThe child process!!\nMy PID is %d\n", result, getpid());        }        else        {            printf("The returned value is %d\nThe father process!!\nMy PID is %d\n", result, getpid());        }    }        return 0;}

exec.c

#include 
     
      #include 
      
       #include 
       
        int main(void){    pid_t result;        result = fork();        if (result == 0)    {        if (execlp("ps", "ps", "-ef", NULL) < 0)        {            printf("Execlp error\n");        }    }        return 0;}

waitpid.c

#include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          int main(void){    pid_t pc, pr;        pc = fork();        if (pc < 0)    {        printf("Error fork\n");    }    else if (pc == 0)    {        sleep(5);        exit(0);    }    else    {        do        {            pr = waitpid(pc, NULL, WNOHANG);                        if(pr == 0)            {                printf("The child process has not exited!\n");                sleep(1);            }        }while (pr == 0);                if (pr == pc)        {            printf("Get child exit code: %d\n", pr);        }        else        {            printf("Some error occured.\n");        }    }        return 0;}