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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: tx-socket.c,v 1.2 2002/01/30 09:25:35 mdw Exp $ |
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4 | * |
5 | * Socket transport |
6 | * |
7 | * (c) 2001 Mark Wooding |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Jog: Programming for a jogging machine. |
13 | * |
14 | * Jog is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * Jog is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with Jog; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: tx-socket.c,v $ |
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32 | * Revision 1.2 2002/01/30 09:25:35 mdw |
33 | * Minor modifications for the transport configuration change. |
34 | * |
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35 | * Revision 1.1 2002/01/25 19:34:45 mdw |
36 | * Initial revision |
37 | * |
38 | */ |
39 | |
40 | /*----- Header files ------------------------------------------------------*/ |
41 | |
42 | #ifdef HAVE_CONFIG_H |
43 | # include "config.h" |
44 | #endif |
45 | |
46 | #include <errno.h> |
47 | #include <stddef.h> |
48 | #include <stdio.h> |
49 | #include <stdlib.h> |
50 | #include <string.h> |
51 | |
52 | #include <sys/types.h> |
53 | #include <unistd.h> |
54 | #include <sys/socket.h> |
55 | #include <sys/un.h> |
56 | #include <pthread.h> |
57 | |
58 | #include <mLib/alloc.h> |
59 | #include <mLib/darray.h> |
60 | #include <mLib/sub.h> |
61 | |
62 | #include "err.h" |
63 | #include "txport.h" |
64 | #include "tx-socket.h" |
65 | |
66 | #undef sun |
67 | |
68 | /*----- Data structures ---------------------------------------------------*/ |
69 | |
70 | typedef struct txsock { |
71 | txport tx; /* Transport base */ |
72 | int fd; /* File descriptor */ |
73 | } txsock; |
74 | |
75 | /*----- Main code ---------------------------------------------------------*/ |
76 | |
77 | /* --- @txsock_create@ --- * |
78 | * |
79 | * Arguments: @const char *file@ = filename for socket |
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80 | * |
81 | * Returns: Pointer to created transport block. |
82 | * |
83 | * Use: Creates a socket transport. |
84 | */ |
85 | |
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86 | txport *txsock_create(const char *file) |
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87 | { |
88 | txsock *tx; |
89 | int fd; |
90 | struct sockaddr_un *sun; |
91 | size_t len, sunsz; |
92 | |
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93 | /* --- Set up the address block --- */ |
94 | |
95 | len = strlen(file) + 1; |
96 | sunsz = offsetof(struct sockaddr_un, sun_path) + len; |
97 | sun = xmalloc(sunsz); |
98 | sun->sun_family = AF_UNIX; |
99 | memcpy(sun->sun_path, file, len); |
100 | |
101 | /* --- Create the socket --- */ |
102 | |
103 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { |
104 | err_report(ERR_TXPORT, ERRTX_CREATE, errno, |
105 | "error creating socket: %s", strerror(errno)); |
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106 | goto fail_0; |
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107 | } |
108 | |
109 | /* --- Connect --- */ |
110 | |
111 | if (connect(fd, (struct sockaddr *)sun, sunsz)) { |
112 | err_report(ERR_TXPORT, ERRTX_CREATE, errno, |
113 | "couldn't connect to `%s': %s", file, strerror(errno)); |
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114 | goto fail_1; |
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115 | } |
116 | |
117 | /* --- Done --- */ |
118 | |
119 | tx = CREATE(txsock); |
120 | tx->fd = fd; |
121 | xfree(sun); |
122 | return (&tx->tx); |
123 | |
124 | /* --- Tidy up because it all went horribly wrong --- */ |
125 | |
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126 | fail_1: |
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127 | close(fd); |
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128 | fail_0: |
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129 | xfree(sun); |
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130 | return (0); |
131 | } |
132 | |
133 | /* --- @txsock_write@ --- * |
134 | * |
135 | * Arguments: @txport *txg@ = pointer to transport context |
136 | * @const void *p@ = pointer to buffer |
137 | * @size_t sz@ = size of the buffer |
138 | * |
139 | * Returns: Number of bytes written, or @-1@ on error. |
140 | * |
141 | * Use: Writes data to a transport. |
142 | */ |
143 | |
144 | ssize_t txsock_write(txport *txg, const void *p, size_t sz) |
145 | { |
146 | txsock *tx = (txsock *)txg; |
147 | |
148 | return (write(tx->fd, p, sz)); |
149 | } |
150 | |
151 | /* --- @txsock_fetch@ --- * |
152 | * |
153 | * Arguments: @void *txv@ = pointer to transport context |
154 | * |
155 | * Returns: Nothing of interest. |
156 | * |
157 | * Use: Thread to fetch data from a socket. |
158 | */ |
159 | |
160 | void *txsock_fetch(void *txv) |
161 | { |
162 | txsock *tx = txv; |
163 | unsigned char buf[BUFSIZ]; |
164 | ssize_t n; |
165 | int e; |
166 | |
167 | /* --- Read data while it arrives --- */ |
168 | |
169 | for (;;) { |
170 | n = read(tx->fd, buf, sizeof(buf)); |
171 | if (n < 0) { |
172 | err_report(ERR_TXPORT, ERRTX_READ, errno, |
173 | "error reading from socket: %s", strerror(errno)); |
174 | break; |
175 | } |
176 | if (!n) |
177 | break; |
178 | if ((e = pthread_mutex_lock(&tx->tx.mx)) != 0) { |
179 | err_report(ERR_TXPORT, ERRTX_READ, e, |
180 | "error locking mutex: %s", strerror(e)); |
181 | break; |
182 | } |
183 | DA_ENSURE(&tx->tx.buf, n); |
184 | memcpy(DA(&tx->tx.buf) + DA_LEN(&tx->tx.buf), buf, n); |
185 | DA_EXTEND(&tx->tx.buf, n); |
186 | pthread_cond_signal(&tx->tx.cv); |
187 | pthread_mutex_unlock(&tx->tx.mx); |
188 | } |
189 | |
190 | /* --- Deal with crapness --- */ |
191 | |
192 | e = pthread_mutex_lock(&tx->tx.mx); |
193 | tx->tx.s = TX_CLOSE; |
194 | pthread_cond_signal(&tx->tx.cv); |
195 | pthread_mutex_unlock(&tx->tx.mx); |
196 | return (0); |
197 | } |
198 | |
199 | /* --- @txsock_destroy@ --- * |
200 | * |
201 | * Arguments: @txport *txg@ = pointer to transport context |
202 | * |
203 | * Returns: --- |
204 | * |
205 | * Use: Destroys a socket transport. |
206 | */ |
207 | |
208 | void txsock_destroy(txport *txg) |
209 | { |
210 | txsock *tx = (txsock *)txg; |
211 | |
212 | close(tx->fd); |
213 | DESTROY(tx); |
214 | } |
215 | |
216 | /*----- That's all, folks -------------------------------------------------*/ |