/*
	This program tests the functionality of the pipes.

	It opens a pipe, forks and executes cat after dup-ing
	the output end to stdin.

	Afterwards the parent spews a pile of data into the input end,
	closes the pipe and waits for cat to exit.
*/
#include "api.h"
#include "lib.h"
// the array indicies that pipe() returns.
#define READ 0
#define WRITE 1
// the data to send over the pipe.
const char* teststr="This is a drill, this is a drill\n";

int main(int argc,char**argv) {
	int len=strlen(teststr)+1;
	print("Pipe test 1\n");
	int fds[2];	// open a pipe
	if(sys_pipe(fds)==-1) {
		printf("Error creating pipes: %d\n",errno);
		return 1;
	}
	printf("Got FDs in:%d\tout=%d\n",fds[READ],fds[WRITE]);
	if(sys_fork()==0) { // dup it and fork off to cat.
		sys_close(fds[WRITE]);
		sys_dup(fds[READ],stdin);
		int fd=sys_open("bin/cat",0);
		if(fd==-1) {
			printf("Couldn't open cat file: %d.\n",errno);
			return 1;
		}
		sys_execve(fd,argv);
	} else {	// close the other end of the pipe
		sys_close(fds[READ]);
		for(int i=0;i<5;++i)	// spew some data down it.
			sys_write(fds[WRITE],teststr,len);
		sys_close(fds[WRITE]);
		// close it and wait.
		int c;
		sys_wait(&c);
		printf("Cat returned %d.\n",c);
	}
	return 0;
}