2ec1e693 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: tx-socket.c,v 1.1 2002/01/25 19:34:45 mdw Exp $ |
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 $ |
32 | * Revision 1.1 2002/01/25 19:34:45 mdw |
33 | * Initial revision |
34 | * |
35 | */ |
36 | |
37 | /*----- Header files ------------------------------------------------------*/ |
38 | |
39 | #ifdef HAVE_CONFIG_H |
40 | # include "config.h" |
41 | #endif |
42 | |
43 | #include <errno.h> |
44 | #include <stddef.h> |
45 | #include <stdio.h> |
46 | #include <stdlib.h> |
47 | #include <string.h> |
48 | |
49 | #include <sys/types.h> |
50 | #include <unistd.h> |
51 | #include <sys/socket.h> |
52 | #include <sys/un.h> |
53 | #include <pthread.h> |
54 | |
55 | #include <mLib/alloc.h> |
56 | #include <mLib/darray.h> |
57 | #include <mLib/sub.h> |
58 | |
59 | #include "err.h" |
60 | #include "txport.h" |
61 | #include "tx-socket.h" |
62 | |
63 | #undef sun |
64 | |
65 | /*----- Data structures ---------------------------------------------------*/ |
66 | |
67 | typedef struct txsock { |
68 | txport tx; /* Transport base */ |
69 | int fd; /* File descriptor */ |
70 | } txsock; |
71 | |
72 | /*----- Main code ---------------------------------------------------------*/ |
73 | |
74 | /* --- @txsock_create@ --- * |
75 | * |
76 | * Arguments: @const char *file@ = filename for socket |
77 | * @const char *config@ = configuration string |
78 | * |
79 | * Returns: Pointer to created transport block. |
80 | * |
81 | * Use: Creates a socket transport. |
82 | */ |
83 | |
84 | txport *txsock_create(const char *file, const char *config) |
85 | { |
86 | txsock *tx; |
87 | int fd; |
88 | struct sockaddr_un *sun; |
89 | size_t len, sunsz; |
90 | |
91 | /* --- Parse the configuration --- */ |
92 | |
93 | if (config && *config) { |
94 | err_report(ERR_TXPORT, ERRTX_CONFIG, 0, |
95 | "bad configuration for socket transport"); |
96 | goto fail_0; |
97 | } |
98 | |
99 | /* --- Set up the address block --- */ |
100 | |
101 | len = strlen(file) + 1; |
102 | sunsz = offsetof(struct sockaddr_un, sun_path) + len; |
103 | sun = xmalloc(sunsz); |
104 | sun->sun_family = AF_UNIX; |
105 | memcpy(sun->sun_path, file, len); |
106 | |
107 | /* --- Create the socket --- */ |
108 | |
109 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { |
110 | err_report(ERR_TXPORT, ERRTX_CREATE, errno, |
111 | "error creating socket: %s", strerror(errno)); |
112 | goto fail_1; |
113 | } |
114 | |
115 | /* --- Connect --- */ |
116 | |
117 | if (connect(fd, (struct sockaddr *)sun, sunsz)) { |
118 | err_report(ERR_TXPORT, ERRTX_CREATE, errno, |
119 | "couldn't connect to `%s': %s", file, strerror(errno)); |
120 | goto fail_2; |
121 | } |
122 | |
123 | /* --- Done --- */ |
124 | |
125 | tx = CREATE(txsock); |
126 | tx->fd = fd; |
127 | xfree(sun); |
128 | return (&tx->tx); |
129 | |
130 | /* --- Tidy up because it all went horribly wrong --- */ |
131 | |
132 | fail_2: |
133 | close(fd); |
134 | fail_1: |
135 | xfree(sun); |
136 | fail_0: |
137 | return (0); |
138 | } |
139 | |
140 | /* --- @txsock_write@ --- * |
141 | * |
142 | * Arguments: @txport *txg@ = pointer to transport context |
143 | * @const void *p@ = pointer to buffer |
144 | * @size_t sz@ = size of the buffer |
145 | * |
146 | * Returns: Number of bytes written, or @-1@ on error. |
147 | * |
148 | * Use: Writes data to a transport. |
149 | */ |
150 | |
151 | ssize_t txsock_write(txport *txg, const void *p, size_t sz) |
152 | { |
153 | txsock *tx = (txsock *)txg; |
154 | |
155 | return (write(tx->fd, p, sz)); |
156 | } |
157 | |
158 | /* --- @txsock_fetch@ --- * |
159 | * |
160 | * Arguments: @void *txv@ = pointer to transport context |
161 | * |
162 | * Returns: Nothing of interest. |
163 | * |
164 | * Use: Thread to fetch data from a socket. |
165 | */ |
166 | |
167 | void *txsock_fetch(void *txv) |
168 | { |
169 | txsock *tx = txv; |
170 | unsigned char buf[BUFSIZ]; |
171 | ssize_t n; |
172 | int e; |
173 | |
174 | /* --- Read data while it arrives --- */ |
175 | |
176 | for (;;) { |
177 | n = read(tx->fd, buf, sizeof(buf)); |
178 | if (n < 0) { |
179 | err_report(ERR_TXPORT, ERRTX_READ, errno, |
180 | "error reading from socket: %s", strerror(errno)); |
181 | break; |
182 | } |
183 | if (!n) |
184 | break; |
185 | if ((e = pthread_mutex_lock(&tx->tx.mx)) != 0) { |
186 | err_report(ERR_TXPORT, ERRTX_READ, e, |
187 | "error locking mutex: %s", strerror(e)); |
188 | break; |
189 | } |
190 | DA_ENSURE(&tx->tx.buf, n); |
191 | memcpy(DA(&tx->tx.buf) + DA_LEN(&tx->tx.buf), buf, n); |
192 | DA_EXTEND(&tx->tx.buf, n); |
193 | pthread_cond_signal(&tx->tx.cv); |
194 | pthread_mutex_unlock(&tx->tx.mx); |
195 | } |
196 | |
197 | /* --- Deal with crapness --- */ |
198 | |
199 | e = pthread_mutex_lock(&tx->tx.mx); |
200 | tx->tx.s = TX_CLOSE; |
201 | pthread_cond_signal(&tx->tx.cv); |
202 | pthread_mutex_unlock(&tx->tx.mx); |
203 | return (0); |
204 | } |
205 | |
206 | /* --- @txsock_destroy@ --- * |
207 | * |
208 | * Arguments: @txport *txg@ = pointer to transport context |
209 | * |
210 | * Returns: --- |
211 | * |
212 | * Use: Destroys a socket transport. |
213 | */ |
214 | |
215 | void txsock_destroy(txport *txg) |
216 | { |
217 | txsock *tx = (txsock *)txg; |
218 | |
219 | close(tx->fd); |
220 | DESTROY(tx); |
221 | } |
222 | |
223 | /*----- That's all, folks -------------------------------------------------*/ |