// A demonstration of unix pipes where string are written

// A demonstration of unix pipes where string are written
// to the input of a child
#include <iostream>
#include <unistd.h>
#include <cstring>
#include <string>

using namespace std;

void parent_main(int fd);
void child_main();

int main(void) {
int p[2];
int i;
int pid;

//create the pipe
pipe(p);

//fork the process
pid = fork();

//set up the pipe
if(pid) {
//close the unused side of the pipe
close(p[0]);

parent_main(p[1]);
} else {
//child process does the reading
dup2(p[0], STDIN_FILENO);

//close the unused side of the pipe
close(p[1]);

child_main();
}

return 0;
}

void
parent_main(int fd) {
const char *s = "Hello, world\n";
for(int i=0; i<10; i++) {
write(fd, s, strlen(s));
}
}

void
child_main() {
//read the entire input stream
string s;

while(!cin.eof()) {
getline(cin, s);
cout << "Child received: " << s << endl;
}

}