1 /*
2 Copyright (c) 2013 Martin Sustrik All rights reserved.
3 Copyright 2016 Garrett D'Amore <garrett@damore.org>
4
5 Permission is hereby granted, free of charge, to any person obtaining a copy
6 of this software and associated documentation files (the "Software"),
7 to deal in the Software without restriction, including without limitation
8 the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 and/or sell copies of the Software, and to permit persons to whom
10 the Software is furnished to do so, subject to the following conditions:
11
12 The above copyright notice and this permission notice shall be included
13 in all copies or substantial portions of the Software.
14
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 IN THE SOFTWARE.
22 */
23
24 #include "xbus.h"
25
26 #include "../../nn.h"
27 #include "../../bus.h"
28
29 #include "../../utils/cont.h"
30 #include "../../utils/alloc.h"
31 #include "../../utils/err.h"
32
33 struct nn_bus {
34 struct nn_xbus xbus;
35 };
36
37 /* Private functions. */
38 static void nn_bus_init (struct nn_bus *self,
39 const struct nn_sockbase_vfptr *vfptr, void *hint);
40 static void nn_bus_term (struct nn_bus *self);
41
42 /* Implementation of nn_sockbase's virtual functions. */
43 static void nn_bus_destroy (struct nn_sockbase *self);
44 static int nn_bus_send (struct nn_sockbase *self, struct nn_msg *msg);
45 static int nn_bus_recv (struct nn_sockbase *self, struct nn_msg *msg);
46 static const struct nn_sockbase_vfptr nn_bus_sockbase_vfptr = {
47 NULL,
48 nn_bus_destroy,
49 nn_xbus_add,
50 nn_xbus_rm,
51 nn_xbus_in,
52 nn_xbus_out,
53 nn_xbus_events,
54 nn_bus_send,
55 nn_bus_recv,
56 NULL,
57 NULL
58 };
59
nn_bus_init(struct nn_bus * self,const struct nn_sockbase_vfptr * vfptr,void * hint)60 static void nn_bus_init (struct nn_bus *self,
61 const struct nn_sockbase_vfptr *vfptr, void *hint)
62 {
63 nn_xbus_init (&self->xbus, vfptr, hint);
64 }
65
nn_bus_term(struct nn_bus * self)66 static void nn_bus_term (struct nn_bus *self)
67 {
68 nn_xbus_term (&self->xbus);
69 }
70
nn_bus_destroy(struct nn_sockbase * self)71 static void nn_bus_destroy (struct nn_sockbase *self)
72 {
73 struct nn_bus *bus;
74
75 bus = nn_cont (self, struct nn_bus, xbus.sockbase);
76
77 nn_bus_term (bus);
78 nn_free (bus);
79 }
80
nn_bus_send(struct nn_sockbase * self,struct nn_msg * msg)81 static int nn_bus_send (struct nn_sockbase *self, struct nn_msg *msg)
82 {
83 int rc;
84 struct nn_bus *bus;
85
86 bus = nn_cont (self, struct nn_bus, xbus.sockbase);
87
88 /* Check for malformed messages. */
89 if (nn_chunkref_size (&msg->sphdr))
90 return -EINVAL;
91
92 /* Send the message. */
93 rc = nn_xbus_send (&bus->xbus.sockbase, msg);
94 errnum_assert (rc == 0, -rc);
95
96 return 0;
97 }
98
nn_bus_recv(struct nn_sockbase * self,struct nn_msg * msg)99 static int nn_bus_recv (struct nn_sockbase *self, struct nn_msg *msg)
100 {
101 int rc;
102 struct nn_bus *bus;
103
104 bus = nn_cont (self, struct nn_bus, xbus.sockbase);
105
106 /* Get next message. */
107 rc = nn_xbus_recv (&bus->xbus.sockbase, msg);
108 if (nn_slow (rc == -EAGAIN))
109 return -EAGAIN;
110 errnum_assert (rc == 0, -rc);
111 nn_assert (nn_chunkref_size (&msg->sphdr) == sizeof (uint64_t));
112
113 /* Discard the header. */
114 nn_chunkref_term (&msg->sphdr);
115 nn_chunkref_init (&msg->sphdr, 0);
116
117 return 0;
118 }
119
nn_bus_create(void * hint,struct nn_sockbase ** sockbase)120 static int nn_bus_create (void *hint, struct nn_sockbase **sockbase)
121 {
122 struct nn_bus *self;
123
124 self = nn_alloc (sizeof (struct nn_bus), "socket (bus)");
125 alloc_assert (self);
126 nn_bus_init (self, &nn_bus_sockbase_vfptr, hint);
127 *sockbase = &self->xbus.sockbase;
128
129 return 0;
130 }
131
132 struct nn_socktype nn_bus_socktype = {
133 AF_SP,
134 NN_BUS,
135 0,
136 nn_bus_create,
137 nn_xbus_ispeer,
138 };
139