#include <sys/types.h> 
#include <sys/stat.h> 
int mknod(const char *path,mode_t mod,dev_t dev); 
int mkfifo(const char *path,mode_t mode); 

umask(0);

if (mknod("/tmp/fifo",S_IFIFO | 0666) == -1)

{

perror("mkfifo error");

exit(1);

} 

umask(0);

if (mkfifo("/tmp/fifo",S_IFIFO|0666) == -1)

{


perror("mkfifo error!");

exit(1);

}

#include<stdlib.h> 
#include<stdio.h> 
#include<sys/types.h> 
#include<sys/stat.h> 
#include<fcntl.h> 
#include<errno.h> 
#define PATH "./fifo" 
#define SIZE 128 
int main() 
{ 
 umask(0); 
 if (mkfifo (PATH,0666|S_IFIFO) == -1) 
 { 
 perror ("mkefifo error"); 
 exit(0); 
 } 
 int fd = open (PATH,O_RDONLY); 
 if (fd<0) 
 { 
  printf("open fd is errorn"); 
  return 0; 
 } 
 
 char Buf[SIZE]; 
 while(1){ 
 ssize_t s = read(fd,Buf,sizeof(Buf)); 
 if (s<0) 
 { 
  perror("read error"); 
  exit(1); 
 } 
 else if (s == 0) 
 { 
  printf("client quit! i shoud quit!n"); 
  break; 
 } 
 else 
 { 
  Buf[s] = ''; 
  printf("client# %s ",Buf); 
  fflush(stdout); 
 } 
 } 
 close (fd); 
 return 3; 
} 

#include<stdlib.h> 
#include<stdio.h> 
#include<unistd.h> 
#include<sys/types.h> 
#include<sys/stat.h> 
#include<string.h> 
#include<errno.h> 
#include<fcntl.h> 
 
#define PATH "./fifo" 
#define SIZE 128 
int main() 
{ 
 int fd = open(PATH,O_WRONLY); 
 if (fd < 0) 
 { 
  perror("open error"); 
  exit(0); 
 } 
 
 char Buf[SIZE]; 
 while(1) 
 { 
  printf("please Enter#:"); 
  fflush(stdout); 
  ssize_t s = read(0,Buf,sizeof(Buf)); 
  if (s<0) 
  { 
   perror("read is failed"); 
   exit(1); 
  } 
  else if(s==0) 
  { 
   printf("read is closed!"); 
   return 1; 
  } 
  else{ 
   Buf[s]= ''; 
   write(fd,Buf,strlen(Buf)); 
  } 
 } 
 return 0; 
}