#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] = "Hello";
char read msg[BUFFER SIZE];
int fd[2];
pid t pid;
/* create the pipe */
if (pipe(fd) == -1) {
fprintf(stderr,"Pipe failed");
return 1;
}
/* fork a child process */
pid = fork();
if (pid < 0) { /* error occurred */
fprintf(stderr, "Fork Failed");
return 1;
}
if (pid > 0) { /* parent process */
/* close the unused end of the pipe */
close(fd[READ END]); /*must close before the next action*/
/* write to the pipe */
write(fd[WRITE END], write msg, strlen(write msg)+1);
/* close the write end of the pipe */
close(fd[WRITE END]);
}
else { /* child process */
/* close the unused end of the pipe */
close(fd[WRITE END]);
/* read from the pipe */
read(fd[READ END], read msg, BUFFER SIZE); /*buffer size to make sure exact
size here*/
printf("read %s",read msg);
/* close the read end of the pipe */
close(fd[READ END]);
}
return 0;
}
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