2ec1e693 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: tx-serial-unix.c,v 1.1 2002/01/25 19:34:45 mdw Exp $ |
4 | * |
5 | * Unix/POSIX serial 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-serial-unix.c,v $ |
32 | * Revision 1.1 2002/01/25 19:34:45 mdw |
33 | * Initial revision |
34 | * |
35 | */ |
36 | |
37 | /*----- Header files ------------------------------------------------------*/ |
38 | |
39 | #include <assert.h> |
40 | #include <errno.h> |
41 | #include <stdio.h> |
42 | #include <stdlib.h> |
43 | #include <string.h> |
44 | |
45 | #include <sys/types.h> |
46 | #include <termios.h> |
47 | #include <unistd.h> |
48 | #include <fcntl.h> |
49 | |
50 | #include <mLib/darray.h> |
51 | #include <mLib/fdflags.h> |
52 | #include <mLib/sub.h> |
53 | |
54 | #include "err.h" |
55 | #include "serial.h" |
56 | #include "txport.h" |
57 | |
58 | #ifndef O_NOCTTY |
59 | # define O_NOCTTY 0 |
60 | #endif |
61 | |
62 | /*----- Data structures ---------------------------------------------------*/ |
63 | |
64 | typedef struct txsu { |
65 | txport tx; /* Transport base */ |
66 | struct txsu *next, **prev; /* Chain of serial transports */ |
67 | int fd; /* File descriptor */ |
68 | struct termios old_ta; /* Old terminal settings */ |
69 | } txsu; |
70 | |
71 | /*----- Static variables --------------------------------------------------*/ |
72 | |
73 | struct baudmap { unsigned long baud; unsigned long magic; }; |
74 | |
75 | static struct baudmap baudmap[] = { |
76 | #ifdef B50 |
77 | { 50, B50 }, |
78 | #endif |
79 | #ifdef B75 |
80 | { 75, B75 }, |
81 | #endif |
82 | #ifdef B110 |
83 | { 110, B110 }, |
84 | #endif |
85 | #ifdef B134 |
86 | { 134, B134 }, |
87 | #endif |
88 | #ifdef B150 |
89 | { 150, B150 }, |
90 | #endif |
91 | #ifdef B200 |
92 | { 200, B200 }, |
93 | #endif |
94 | #ifdef B300 |
95 | { 300, B300 }, |
96 | #endif |
97 | #ifdef B600 |
98 | { 600, B600 }, |
99 | #endif |
100 | #ifdef B1200 |
101 | { 1200, B1200 }, |
102 | #endif |
103 | #ifdef B1800 |
104 | { 1800, B1800 }, |
105 | #endif |
106 | #ifdef B2400 |
107 | { 2400, B2400 }, |
108 | #endif |
109 | #ifdef B4800 |
110 | { 4800, B4800 }, |
111 | #endif |
112 | #ifdef B9600 |
113 | { 9600, B9600 }, |
114 | #endif |
115 | #ifdef B19200 |
116 | { 19200, B19200 }, |
117 | #endif |
118 | #ifdef B38400 |
119 | { 38400, B38400 }, |
120 | #endif |
121 | #ifdef B57600 |
122 | { 57600, B57600 }, |
123 | #endif |
124 | #ifdef B115200 |
125 | { 115200, B115200 }, |
126 | #endif |
127 | #ifdef B230400 |
128 | { 230400, B230400 }, |
129 | #endif |
130 | { 0, 0 } |
131 | }; |
132 | |
133 | static unsigned long csize[] = { CS5, CS6, CS7, CS8 }; |
134 | |
135 | static txsu *active = 0; |
136 | |
137 | /*----- Main code ---------------------------------------------------------*/ |
138 | |
139 | /* --- @txsu_shutdown@ --- * |
140 | * |
141 | * Arguments: --- |
142 | * |
143 | * Returns: --- |
144 | * |
145 | * Use: Restores terminal settings on exit. |
146 | */ |
147 | |
148 | void txsu_shutdown(void) |
149 | { |
150 | txsu *tx; |
151 | |
152 | for (tx = active; tx; tx = tx->next) |
153 | tcsetattr(tx->fd, TCSAFLUSH, &tx->old_ta); |
154 | } |
155 | |
156 | /* --- @txsu_create@ --- * |
157 | * |
158 | * Arguments: @const char *file@ = filename for serial port |
159 | * @const char *config@ = configuration string |
160 | * |
161 | * Returns: Pointer to created transport block. |
162 | * |
163 | * Use: Creates a serial port transport. |
164 | */ |
165 | |
166 | txport *txsu_create(const char *file, const char *config) |
167 | { |
168 | txsu *tx; |
169 | serial_config sc = SERIAL_INIT; |
170 | struct termios ta, old_ta; |
171 | struct baudmap *b; |
172 | int fd; |
173 | |
174 | /* --- Parse the configuration and check it --- */ |
175 | |
176 | if (config && *config && serial_parse(config, &sc)) |
177 | goto conferr; |
178 | |
179 | for (b = baudmap; b->baud && b->baud != sc.baud; b++) |
180 | ; |
181 | if (!b->baud || |
182 | sc.wordlen < 5 || sc.wordlen > 8 || |
183 | sc.stopbits < 1 || sc.stopbits > 2) |
184 | goto conferr; |
185 | |
186 | /* --- Open the serial port and fetch attributes --- */ |
187 | |
188 | if ((fd = open(file, O_RDWR | O_NOCTTY | O_NONBLOCK)) < 0) { |
189 | err_report(ERR_TXPORT, ERRTX_CREATE, errno, |
190 | "couldn't open device `%s': %s", file, strerror(errno)); |
191 | goto fail_0; |
192 | } |
193 | if (fdflags(fd, O_NONBLOCK, 0, 0, 0)) { |
194 | err_report(ERR_TXPORT, ERRTX_CREATE, errno, |
195 | "fcntl(clear O_NONBLOCK): %s", file, strerror(errno)); |
196 | goto fail_1; |
197 | } |
198 | |
199 | if (tcgetattr(fd, &ta)) { |
200 | err_report(ERR_TXPORT, ERRTX_CREATE, errno, |
201 | "couldn't get terminal attributes: %s", strerror(errno)); |
202 | goto fail_1; |
203 | } |
204 | old_ta = ta; |
205 | |
206 | /* --- Fix the attributes --- */ |
207 | |
208 | ta.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON); |
209 | ta.c_oflag &= ~OPOST; |
210 | ta.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN); |
211 | ta.c_cflag &= ~(CRTSCTS); |
212 | ta.c_cc[VMIN] = 1; |
213 | ta.c_cc[VTIME] = 0; |
214 | |
215 | cfsetospeed(&ta, b->magic); |
216 | cfsetispeed(&ta, b->magic); |
217 | ta.c_cflag = (ta.c_cflag & ~CSIZE) | csize[sc.wordlen - 5]; |
218 | switch (sc.parity) { |
219 | case PARITY_NONE: ta.c_cflag &= ~PARENB; break; |
220 | case PARITY_ODD: ta.c_cflag |= PARENB | PARODD; break; |
221 | case PARITY_EVEN: ta.c_cflag |= PARENB; ta.c_cflag &= ~PARODD; break; |
222 | } |
223 | switch (sc.stopbits) { |
224 | case 1: ta.c_cflag &= ~CSTOPB; break; |
225 | case 2: ta.c_cflag |= CSTOPB; break; |
226 | } |
227 | |
228 | /* --- Set attributes --- */ |
229 | |
230 | if (tcsetattr(fd, TCSAFLUSH, &ta)) { |
231 | err_report(ERR_TXPORT, ERRTX_CREATE, errno, |
232 | "couldn't set terminal attributes: %s", strerror(errno)); |
233 | goto fail_1; |
234 | } |
235 | |
236 | /* --- Done --- */ |
237 | |
238 | tx = CREATE(txsu); |
239 | tx->fd = fd; |
240 | tx->old_ta = old_ta; |
241 | tx->next = active; |
242 | tx->prev = &active; |
243 | active = tx; |
244 | return (&tx->tx); |
245 | |
246 | /* --- Tidy up because it all went horribly wrong --- */ |
247 | |
248 | fail_1: |
249 | close(fd); |
250 | fail_0: |
251 | return (0); |
252 | |
253 | conferr: |
254 | err_report(ERR_TXPORT, ERRTX_CONFIG, 0, |
255 | "bad configuration for serial port transport"); |
256 | goto fail_0; |
257 | } |
258 | |
259 | /* --- @txsu_write@ --- * |
260 | * |
261 | * Arguments: @txport *txg@ = pointer to transport context |
262 | * @const void *p@ = pointer to buffer |
263 | * @size_t sz@ = size of the buffer |
264 | * |
265 | * Returns: Number of bytes written, or @-1@ on error. |
266 | * |
267 | * Use: Writes data to a transport. |
268 | */ |
269 | |
270 | ssize_t txsu_write(txport *txg, const void *p, size_t sz) |
271 | { |
272 | txsu *tx = (txsu *)txg; |
273 | |
274 | return (write(tx->fd, p, sz)); |
275 | } |
276 | |
277 | /* --- @txsu_fetch@ --- * |
278 | * |
279 | * Arguments: @void *txv@ = pointer to transport context |
280 | * |
281 | * Returns: Nothing of interest. |
282 | * |
283 | * Use: Thread to fetch data from a serial port. |
284 | */ |
285 | |
286 | void *txsu_fetch(void *txv) |
287 | { |
288 | txsu *tx = txv; |
289 | unsigned char buf[BUFSIZ]; |
290 | ssize_t n; |
291 | int e; |
292 | |
293 | /* --- Read data while it arrives --- */ |
294 | |
295 | for (;;) { |
296 | n = read(tx->fd, buf, sizeof(buf)); |
297 | if (n < 0) { |
298 | err_report(ERR_TXPORT, ERRTX_READ, errno, |
299 | "error reading from serial port: %s", strerror(errno)); |
300 | break; |
301 | } |
302 | #ifdef TERMINAL_EOF |
303 | if (!n) break; |
304 | #else |
305 | if (!n) continue; |
306 | #endif |
307 | if ((e = pthread_mutex_lock(&tx->tx.mx)) != 0) { |
308 | err_report(ERR_TXPORT, ERRTX_READ, e, |
309 | "error locking mutex: %s", strerror(e)); |
310 | break; |
311 | } |
312 | DA_ENSURE(&tx->tx.buf, n); |
313 | memcpy(DA(&tx->tx.buf) + DA_LEN(&tx->tx.buf), buf, n); |
314 | DA_EXTEND(&tx->tx.buf, n); |
315 | pthread_cond_signal(&tx->tx.cv); |
316 | pthread_mutex_unlock(&tx->tx.mx); |
317 | } |
318 | |
319 | /* --- Deal with crapness --- */ |
320 | |
321 | e = pthread_mutex_lock(&tx->tx.mx); |
322 | tx->tx.s = TX_CLOSE; |
323 | pthread_cond_signal(&tx->tx.cv); |
324 | pthread_mutex_unlock(&tx->tx.mx); |
325 | return (0); |
326 | } |
327 | |
328 | /* --- @txsu_destroy@ --- * |
329 | * |
330 | * Arguments: @txport *txg@ = pointer to transport context |
331 | * |
332 | * Returns: --- |
333 | * |
334 | * Use: Destroys a serial port transport. |
335 | */ |
336 | |
337 | void txsu_destroy(txport *txg) |
338 | { |
339 | txsu *tx = (txsu *)txg; |
340 | |
341 | tcsetattr(tx->fd, TCSAFLUSH, &tx->old_ta); |
342 | close(tx->fd); |
343 | *tx->prev = tx->next; |
344 | if (tx->next) |
345 | tx->next->prev = tx->prev; |
346 | DESTROY(tx); |
347 | } |
348 | |
349 | /*----- That's all, folks -------------------------------------------------*/ |