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#include <stdio.h>
int main(void){
int n; // to keep track of num bytes read
int fd[2]; // to hold fds of both ends of pipe
pid_t pid; // pid of child process
char line[80]; // buffer to hold text read/written
if (pipe(fd) < 0) // create the pipe
perror("pipe error");
if ((pid = fork()) < 0) { // fork off a child
perror("fork error");
} else if (pid > 0) { // parent process
close(fd[0]); // close read end
write(fd[1], "hello worldn", 12); // write to it
}else { // child process
close(fd[1]); // close write end
n = read(fd[0], line, 80); // read from pipe
write(1, line, n); // echo to screen
}
exit(0);
}
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