process_pipe.c

进程管道通信

#include<unistd.h>

#include<sys/types.h>

#include<sys/wait.h>

#include<stdio.h>

#include<errno.h>

#define INPUT 0

#define OUTPUT 1


int main(){


  int file1[3];

  //int file2[2];

  pid_t child1,child2;

  char buf1[256];

  char buf2[256];

  int returned_count;

  pipe(file1);

  // pipe(file2);

 
  if((child1=fork())==-1){

    printf("Fork Error:%s\n",strerror(errno));
    exit(1);

  }

  if(child1==0){
 
    close(file1[INPUT]);

     write(file1[OUTPUT],"child1",6);

	      exit(0);
}
  //close(file1[OUTPUT]);

  read(file1[INPUT],buf1,sizeof(buf1));
  // printf("%s\n",buf2);
  open(file1[OUTPUT]);
  child2=fork();
	if(child2==0){
	  close(file1[INPUT]);
       write(file1[OUTPUT],"child2",6);
	      exit(0);}
	close(file1[OUTPUT]);
	read(file1[INPUT],buf2,sizeof(buf2));

	printf("received from spawned process:\n%s\n%s\n",buf1,buf2);
       return 1;
       }