guandao.txt

关于操作系统实验的文件~~~很实用的~~~财操作系统

#include <unistd.h>

#include <signal.h> 

#include <stdio.h>

int pid1,pid2;

int main()

 {   

            int fd[2];  

           char OutPipe[100], InPipe[100];    

           pipe(fd);   

            while((pid1 = fork()) == -1); 

            if( pid1 == 0)   

            {   

                     lockf( fd[1], 1, 0 ); 

                    sprintf(OutPipe, "\n Child process 1 is sending message!\n");    

                    write( fd[1], OutPipe, 50);

                    sleep(5);   

                    lockf(fd[1], 0 , 0);   

                   exit(0);   

              }

              else      

              {      

                       while((pid2 = fork()) == -1);  

                       if( pid2 == 0)    

                       {        

                                lockf( fd[1], 1, 0 );  

                                sprintf(OutPipe, "\n Child process 2 is sending message!\n");       

                                 write( fd[1], OutPipe, 50);

                                sleep(3);   

                                 lockf(fd[1], 0 , 0);  

                                exit(0);

                          }       

                         else

                         {   

                                wait(0);     

                                read(fd[0], InPipe, 50);        

                                printf("%s\n", InPipe);    

                                wait(0);   

                                 read(fd[0], InPipe, 50); 

                                 printf("%s\n", InPipe);  

                                  exit(0);  

                             }

           }

         return 0; 

}