first version of the universal paraslash scheduler
[paraslash.git] / dccp.c
1 /*
2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /** \file dccp.c common functions of the dccp sender/receiver */
20
21 /*
22 * based on common.c of dccp-cs-0.01.tar.bz2,
23 * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
24 */
25
26 #include "para.h"
27 #include "error.h"
28 #include "dccp.h"
29
30 /** \cond some magic dccp constants */
31 #define SOL_DCCP 269
32 #define SOCK_DCCP 6
33 #define IPPROTO_DCCP 33
34 #define DCCP_SOCKOPT_PACKET_SIZE 1
35 #define DCCP_SOCKOPT_SERVICE 2
36 /** \endcond */
37
38 /**
39 * obtain a dccp socket for sending/receiving
40 *
41 * \return the file descriptor of the new socket or \p -E_DCCP_SOCKET
42 * on errors.
43 */
44 int dccp_get_socket(void)
45 {
46 int s = socket(AF_INET, SOCK_DCCP, IPPROTO_DCCP);
47
48 if (s < 0)
49 return -E_DCCP_SOCKET;
50 return s;
51 }
52
53 /**
54 * prepare a dccp socket
55 *
56 * \param fd the file descriptor of the socket
57 *
58 * \returns positive on success, negative on errors.
59 */
60 int dccp_set_socket(int fd)
61 {
62 int pkt_size = 256, ret;
63
64 /* hack to get a service code */
65 ret = setsockopt(fd, SOL_DCCP, DCCP_SOCKOPT_PACKET_SIZE,
66 (char*)&pkt_size, sizeof(pkt_size));
67 if (ret < 0)
68 return -E_DCCP_PACKET_SIZE;
69 ret = setsockopt(fd, SOL_DCCP, DCCP_SOCKOPT_SERVICE,
70 (char*)&pkt_size, sizeof(pkt_size));
71 if (ret < 0)
72 return -E_DCCP_SERVICE;
73 return 1;
74 }