pipe.c

操作系统Interprocess Communication（IPC）实验源码。 在Unix的内核环境中

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <errno.h>

#define FD_READ  0
#define FD_WRITE 1
#define BUF_LEN 100

int main()
{
  pid_t pid;
  int fildes[2];
  char buf[BUF_LEN];

  if (pipe(fildes)<0) {
    perror("pipe");
    exit(1);
  }

  if ((pid=fork())<0) {
    perror("fork");
    exit(1);
  }

  /* create a pipe from father to child */

  if (pid>0) {     /*in child process*/
    printf("In child process\n");
    close(fildes[FD_WRITE]);  /* close write fd */
    if (read(fildes[FD_READ],buf,sizeof(buf))>0) {
      printf("Read String:%s\n",buf);
    }
  } else {
    printf("In father process\n");
    close(fildes[FD_READ]);   /* close read fd */
    if (write(fildes[FD_WRITE],"Hello World",sizeof("Hello World"))<0) {
      perror("write");
    }
  }
  return 0;
}