#include "config.h"
#include <stdio.h>
#include <string.h>

/**
 * io/fdpass - IO helper for passing file descriptors across local sockets
 *
 * This code adds the ability to pass file descriptors to ccan/io.
 *
 * License: LGPL (v2.1 or any later version)
 * Author: Rusty Russell <rusty@rustcorp.com.au>
 *
 * Example:
 *	// Given "hello" outputs hello
 *	#include <ccan/io/fdpass/fdpass.h>
 *	#include <sys/types.h>
 *	#include <sys/socket.h>
 *	#include <sys/un.h>
 *	#include <stdio.h>
 *	#include <stdlib.h>
 *	#include <unistd.h>
 *
 *	// Child reads stdin into the buffer, prints it out.
 *	struct buf {
 *		size_t used;
 *		char c[100];
 *	};
 *	static struct io_plan *read_more(struct io_conn *conn, struct buf *buf)
 *	{
 *		printf("%.*s", (int)buf->used, buf->c);
 *		return io_read_partial(conn, buf->c, sizeof(buf->c), &buf->used,
 *					read_more, buf);
 *	}
 *
 *	// Clean up allocation so -fsanitize=address doesn't see leak!
 *	static void free_buf(struct io_conn *c, struct buf *buf)
 *	{
 *		free(buf);
 *	}
 *
 *	// Child has received fd, start reading loop.
 *	static struct io_plan *got_infd(struct io_conn *conn, int *infd)
 *	{
 *		struct buf *buf = calloc(1, sizeof(*buf));
 *		struct io_conn *new_conn;
 *
 *		new_conn = io_new_conn(NULL, *infd, read_more, buf);
 *		io_set_finish(new_conn, free_buf, buf);
 *		return io_close(conn);
 *	}
 *	// Child is receiving the fd to read into. 
 *	static struct io_plan *recv_infd(struct io_conn *conn, int *infd)
 *	{
 *		return io_recv_fd(conn, infd, got_infd, infd);
 *	}
 *
 *	// Gets passed fd (stdin), which it reads from.
 *	static void child(int sockfd)
 *	{
 *		int infd;
 *
 *		io_new_conn(NULL, sockfd, recv_infd, &infd);
 *		io_loop(NULL, NULL);
 *		exit(0);
 *	}
 *
 *	static struct io_plan *send_stdin(struct io_conn *conn, void *unused)
 *	{
 *		return io_send_fd(conn, STDIN_FILENO, false, io_close_cb, NULL);
 *	}
 *
 *	static void parent(int sockfd)
 *	{
 *		io_new_conn(NULL, sockfd, send_stdin, NULL);
 *		io_loop(NULL, NULL);
 *		exit(0);
 *	}
 *	
 *	int main(void)
 *	{
 *		int sv[2];
 *	
 *		socketpair(AF_UNIX, SOCK_STREAM, 0, sv);
 *		if (fork() == 0)
 *			child(sv[0]);
 *		else
 *			parent(sv[1]);
 *	}
 */
int main(int argc, char *argv[])
{
	/* Expect exactly one argument */
	if (argc != 2)
		return 1;

	if (strcmp(argv[1], "depends") == 0) {
		printf("ccan/fdpass\n");
		printf("ccan/io\n");
		return 0;
	}

	return 1;
}