dccp_recv.c: Reformat comment.
[paraslash.git] / dccp_recv.c
1 /*
2 * Copyright (C) 2006-2008 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file dccp_recv.c paraslash's dccp receiver */
8
9 /*
10 * based on client.c of dccp-cs-0.01.tar.bz2,
11 * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
12 */
13
14 #include <sys/types.h>
15 #include <dirent.h>
16
17 #include "para.h"
18 #include "error.h"
19 #include "list.h"
20 #include "sched.h"
21 #include "recv.h"
22 #include "string.h"
23 #include "net.h"
24 #include "fd.h"
25
26 #include "dccp_recv.cmdline.h"
27
28 /** the size of the output buffer */
29 #define DCCP_BUFSIZE 40960
30
31 /**
32 * data specific to the dccp receiver
33 *
34 * \sa receiver receiver_node
35 */
36 struct private_dccp_recv_data {
37 /** the file descriptor for the dccp socket */
38 int fd;
39 };
40
41
42 static void dccp_recv_close(struct receiver_node *rn)
43 {
44
45 struct private_dccp_recv_data *pdd = rn->private_data;
46
47 if (pdd && pdd->fd > 0)
48 close(pdd->fd);
49 free(rn->buf);
50 rn->buf = NULL;
51 free(rn->private_data);
52 rn->private_data = NULL;
53 }
54
55
56 static int dccp_recv_open(struct receiver_node *rn)
57 {
58 struct private_dccp_recv_data *pdd;
59 struct dccp_recv_args_info *conf = rn->conf;
60 int ret = makesock(AF_UNSPEC, IPPROTO_DCCP, 0, conf->host_arg, conf->port_arg);
61
62 if (ret < 0)
63 return ret;
64 /*
65 * Disable unused CCIDs: the receiver does not send any application
66 * data to the server. By shutting down this unused path we reduce
67 * internal processing costs, as the unused CCIDs (in the kernel) are
68 * then bypassed.
69 */
70 if (shutdown(ret, SHUT_WR) < 0)
71 return -ERRNO_TO_PARA_ERROR(errno);
72
73 rn->buf = para_calloc(DCCP_BUFSIZE);
74 rn->private_data = pdd = para_calloc(sizeof(struct private_dccp_recv_data));
75
76 pdd->fd = ret;
77 mark_fd_nonblocking(pdd->fd);
78 return 1;
79 }
80
81 static void dccp_shutdown(void)
82 {
83 ; /* nothing to do */
84 }
85
86 static void *dccp_recv_parse_config(int argc, char **argv)
87 {
88 struct dccp_recv_args_info *tmp = para_calloc(sizeof(struct dccp_recv_args_info));
89
90 if (!dccp_recv_cmdline_parser(argc, argv, tmp))
91 return tmp;
92 free(tmp);
93 return NULL;
94 }
95
96 static void dccp_recv_pre_select(struct sched *s, struct task *t)
97 {
98 struct receiver_node *rn = t->private_data;
99 struct private_dccp_recv_data *pdd = rn->private_data;
100
101 t->ret = 1;
102 para_fd_set(pdd->fd, &s->rfds, &s->max_fileno);
103 }
104
105 static void dccp_recv_post_select(struct sched *s, struct task *t)
106 {
107 struct receiver_node *rn = t->private_data;
108 struct private_dccp_recv_data *pdd = rn->private_data;
109
110 if (rn->output_error && *rn->output_error) {
111 t->ret = *rn->output_error;
112 goto out;
113 }
114 t->ret = 1;
115 if (!s->select_ret || !FD_ISSET(pdd->fd, &s->rfds))
116 goto out; /* nothing to do */
117 t->ret = -E_DCCP_OVERRUN;
118 if (rn->loaded >= DCCP_BUFSIZE)
119 goto out;
120 t->ret = recv_bin_buffer(pdd->fd, rn->buf + rn->loaded,
121 DCCP_BUFSIZE - rn->loaded);
122 if (t->ret <= 0) {
123 if (!t->ret)
124 t->ret = -E_RECV_EOF;
125 goto out;
126 }
127 rn->loaded += t->ret;
128 return;
129 out:
130 if (t->ret < 0)
131 rn->error = t->ret;
132 }
133
134 /**
135 * the init function of the dccp receiver
136 *
137 * \param r pointer to the receiver struct to initialize
138 *
139 * Initialize all function pointers of \a r
140 */
141 void dccp_recv_init(struct receiver *r)
142 {
143 r->shutdown = dccp_shutdown;
144 r->open = dccp_recv_open;
145 r->close = dccp_recv_close;
146 r->pre_select = dccp_recv_pre_select;
147 r->post_select = dccp_recv_post_select;
148 r->parse_config = dccp_recv_parse_config;
149 }