Linux c Pipe Example using read() & write()

Linux c Pipe Example using read() & write()

05:52

#include <sys/types.h>

#include <stdio.h>

#include <string.h>

#include <unistd.h>

#define BUFFER_SIZE 25

#define READ_END 0

#define WRITE_END 1

int main(void)

{

   char write_msg[BUFFER_SIZE] = "HaZa CS is AweSome";

   char read_msg[BUFFER_SIZE];

   int fd[2];

   pid_t pid;

  

   if(pipe(fd) == -1){

      fprintf(stderr,"Pipe Failed");

      return 1;

   }

   

   pid = fork();             //forking a child process

  

   if(pid < 0){              //error occured

      fprintf(stderr,"Fork Failed");

      return 1;

   }

  

   else if(pid>0){           //Parent Process

      close(fd[READ_END]);  //Close the unused end of the pipe

      write(fd[WRITE_END],write_msg,strlen(write_msg)+1);

      close(fd[WRITE_END]); //Close the write end

   }

  

   else{                     // CHILD PROCESS //

      close(fd[WRITE_END]); // Close the unused end of the pipe

      read(fd[READ_END],read_msg,BUFFER_SIZE);//Read from the pipe

      printf("\nRead Message: %s\n",read_msg); 

      close(fd[READ_END]);  //Close the write end

   }

   return 0;

}