Commit | Line | Data |
---|---|---|
77c76070 | 1 | #include <sys/select.h> |
bec93767 | 2 | #include <sys/stat.h> |
4d66492f | 3 | |
9b5ebc12 SK |
4 | #include <assert.h> |
5 | #include <ctype.h> | |
77c76070 | 6 | #include <errno.h> |
c5d1af8c | 7 | #include <fcntl.h> |
9b5ebc12 SK |
8 | #include <stdio.h> |
9 | #include <stdlib.h> | |
10 | #include <string.h> | |
b7487ec5 | 11 | #include <time.h> |
c5d1af8c SK |
12 | #include <unistd.h> |
13 | ||
14 | #include <X11/Xlib.h> | |
9b5ebc12 | 15 | |
b7487ec5 | 16 | #include "bsdtimespec.h" |
1084633a SK |
17 | #include "khlib_log.h" |
18 | #include "khlib_time.h" | |
b7487ec5 | 19 | |
544b0835 SK |
20 | #define usage(...) { \ |
21 | print_usage(); \ | |
22 | fprintf(stderr, "Error:\n " __VA_ARGS__); \ | |
23 | exit(EXIT_FAILURE); \ | |
24 | } | |
e6c523cd SK |
25 | #define ERRMSG "ERROR" |
26 | ||
ca7a3d6c | 27 | |
e6c523cd SK |
28 | static const char errmsg[] = ERRMSG; |
29 | static const int errlen = sizeof(ERRMSG) - 1; | |
30 | ||
4d66492f | 31 | char *argv0; |
9b5ebc12 | 32 | |
900b9a6b SK |
33 | /* TODO: Convert slot list to slot array. */ |
34 | typedef struct Slot Slot; | |
35 | struct Slot { | |
36 | char *in_fifo; | |
37 | int in_fd; | |
38 | struct timespec in_last_read; | |
39 | struct timespec out_ttl; | |
40 | int out_width; | |
41 | int out_pos_lo; /* Lowest position on the output buffer. */ | |
42 | int out_pos_cur; /* Current position on the output buffer. */ | |
43 | int out_pos_hi; /* Highest position on the output buffer. */ | |
44 | Slot *next; | |
9b5ebc12 SK |
45 | }; |
46 | ||
4d66492f SK |
47 | typedef struct Config Config; |
48 | struct Config { | |
348d5f36 | 49 | double interval; |
4d66492f | 50 | char * separator; |
900b9a6b SK |
51 | Slot * slots; |
52 | int slot_count; | |
457f091d SK |
53 | int buf_width; |
54 | int to_x_root; | |
9b5ebc12 SK |
55 | }; |
56 | ||
efa97b71 | 57 | enum read_status { |
e6441710 SK |
58 | END_OF_FILE, |
59 | END_OF_MESSAGE, | |
60 | RETRY, | |
61 | FAILURE | |
efa97b71 SK |
62 | }; |
63 | ||
457f091d SK |
64 | char * |
65 | buf_create(Config *cfg) | |
66 | { | |
67 | int seplen; | |
68 | char *buf; | |
69 | Slot *s; | |
70 | ||
71 | buf = calloc(1, cfg->buf_width + 1); | |
72 | if (buf == NULL) | |
73 | khlib_fatal( | |
74 | "[memory] Failed to allocate buffer of %d bytes", | |
75 | cfg->buf_width | |
76 | ); | |
77 | memset(buf, ' ', cfg->buf_width); | |
78 | buf[cfg->buf_width] = '\0'; | |
79 | seplen = strlen(cfg->separator); | |
80 | /* Set the separators */ | |
81 | for (s = cfg->slots; s; s = s->next) { | |
82 | /* Skip the first, left-most */ | |
83 | if (s->out_pos_lo) { | |
84 | /* Copying only seplen ensures we omit the '\0' byte. */ | |
85 | strncpy( | |
86 | buf + (s->out_pos_lo - seplen), | |
87 | cfg->separator, | |
88 | seplen | |
89 | ); | |
90 | } | |
91 | } | |
92 | return buf; | |
93 | } | |
94 | ||
ca7a3d6c SK |
95 | Slot * |
96 | slots_rev(Slot *old) | |
97 | { | |
98 | Slot *tmp = NULL; | |
99 | Slot *new = NULL; | |
100 | ||
101 | while (old) { | |
102 | tmp = old->next; | |
103 | old->next = new; | |
104 | new = old; | |
105 | old = tmp; | |
106 | } | |
107 | return new; | |
108 | } | |
109 | ||
77c76070 | 110 | void |
457f091d | 111 | slot_log(Slot *s) |
77c76070 | 112 | { |
900b9a6b | 113 | khlib_info("Slot " |
a6b13fa2 | 114 | "{" |
900b9a6b SK |
115 | " in_fifo = %s," |
116 | " in_fd = %d," | |
117 | " out_width = %d," | |
118 | " in_last_read = {tv_sec = %ld, tv_nsec = %ld}" | |
119 | " out_ttl = {tv_sec = %ld, tv_nsec = %ld}," | |
120 | " out_pos_lo = %d," | |
121 | " out_pos_cur = %d," | |
122 | " out_pos_hi = %d," | |
a6b13fa2 SK |
123 | " next = %p," |
124 | " }\n", | |
900b9a6b SK |
125 | s->in_fifo, |
126 | s->in_fd, | |
127 | s->out_width, | |
128 | s->in_last_read.tv_sec, | |
129 | s->in_last_read.tv_nsec, | |
130 | s->out_ttl.tv_sec, | |
131 | s->out_ttl.tv_nsec, | |
132 | s->out_pos_lo, | |
133 | s->out_pos_cur, | |
134 | s->out_pos_hi, | |
135 | s->next | |
77c76070 SK |
136 | ); |
137 | } | |
138 | ||
139 | void | |
457f091d | 140 | slots_log(Slot *head) |
77c76070 | 141 | { |
900b9a6b | 142 | for (Slot *s = head; s; s = s->next) { |
457f091d | 143 | slot_log(s); |
77c76070 SK |
144 | } |
145 | } | |
146 | ||
457f091d SK |
147 | void |
148 | slots_assert_fifos_exist(Slot *s) | |
149 | { | |
150 | struct stat st; | |
151 | int errors = 0; | |
152 | ||
153 | for (; s; s = s->next) { | |
154 | if (lstat(s->in_fifo, &st) < 0) { | |
155 | khlib_error( | |
156 | "Cannot stat \"%s\". Error: %s\n", | |
157 | s->in_fifo, | |
158 | strerror(errno) | |
159 | ); | |
160 | errors++; | |
161 | continue; | |
162 | } | |
163 | if (!(st.st_mode & S_IFIFO)) { | |
164 | khlib_error("\"%s\" is not a FIFO\n", s->in_fifo); | |
165 | errors++; | |
166 | continue; | |
167 | } | |
168 | } | |
169 | if (errors) | |
170 | khlib_fatal( | |
171 | "Encountered errors with given file paths. See log.\n" | |
172 | ); | |
173 | } | |
174 | ||
4bfac488 SK |
175 | void |
176 | slot_expire(Slot *s, struct timespec t, char *buf) | |
177 | { | |
178 | struct timespec td; | |
179 | ||
180 | timespecsub(&t, &(s->in_last_read), &td); | |
181 | if (timespeccmp(&td, &(s->out_ttl), >=)) { | |
182 | /* TODO: Maybe configurable expiry character. */ | |
4e3d71e8 | 183 | memset(buf + s->out_pos_lo, '_', s->out_width); |
4bfac488 SK |
184 | khlib_warn("Slot expired: \"%s\"\n", s->in_fifo); |
185 | } | |
186 | } | |
187 | ||
188 | void | |
4e3d71e8 | 189 | slot_set_error(Slot *s, char *buf) |
4bfac488 SK |
190 | { |
191 | char *b; | |
192 | int i; | |
193 | ||
4e3d71e8 | 194 | s->in_fd = -1; |
4bfac488 SK |
195 | b = buf + s->out_pos_lo; |
196 | /* Copy as much of the error message as possible. | |
197 | * EXCLUDING the terminating \0. */ | |
198 | for (i = 0; i < errlen && i < s->out_width; i++) | |
199 | b[i] = errmsg[i]; | |
200 | /* Any remaining positions: */ | |
4e3d71e8 | 201 | memset(b + i, '_', s->out_width - i); |
4bfac488 SK |
202 | } |
203 | ||
204 | enum read_status | |
51e63a6f | 205 | slot_read(Slot *s, char *buf) |
4bfac488 SK |
206 | { |
207 | char c; /* Character read. */ | |
208 | int r; /* Remaining unused positions in buffer range. */ | |
209 | ||
210 | for (;;) { | |
211 | switch (read(s->in_fd, &c, 1)) { | |
212 | case -1: | |
213 | khlib_error( | |
214 | "Failed to read: \"%s\". errno: %d, msg: %s\n", | |
215 | s->in_fifo, | |
216 | errno, | |
217 | strerror(errno) | |
218 | ); | |
219 | switch (errno) { | |
220 | case EINTR: | |
221 | case EAGAIN: | |
222 | return RETRY; | |
223 | default: | |
224 | return FAILURE; | |
225 | } | |
226 | case 0: | |
227 | khlib_debug("%s: End of FILE\n", s->in_fifo); | |
228 | s->out_pos_cur = s->out_pos_lo; | |
229 | return END_OF_FILE; | |
230 | case 1: | |
231 | /* TODO: Consider making msg term char a CLI option */ | |
232 | if (c == '\n' || c == '\0') { | |
4e3d71e8 | 233 | r = (s->out_pos_hi - s->out_pos_cur) + 1; |
4bfac488 SK |
234 | if (r > 0) |
235 | memset(buf + s->out_pos_cur, ' ', r); | |
4bfac488 SK |
236 | return END_OF_MESSAGE; |
237 | } else { | |
238 | if (s->out_pos_cur <= s->out_pos_hi) | |
239 | buf[s->out_pos_cur++] = c; | |
51e63a6f SK |
240 | else |
241 | /* | |
242 | * Force EOM beyond available range. | |
243 | * To ensure that a rogue large message | |
244 | * doesn't trap us here needlessly | |
245 | * long. | |
246 | */ | |
247 | return END_OF_MESSAGE; | |
4bfac488 SK |
248 | } |
249 | break; | |
250 | default: | |
251 | assert(0); | |
252 | } | |
253 | } | |
254 | } | |
255 | ||
256 | void | |
257 | slots_read(Config *cfg, struct timespec *ti, char *buf) | |
258 | { | |
259 | fd_set fds; | |
260 | int maxfd = -1; | |
261 | int ready = 0; | |
262 | struct stat st; | |
263 | struct timespec t; | |
264 | Slot *s; | |
265 | ||
266 | FD_ZERO(&fds); | |
267 | for (s = cfg->slots; s; s = s->next) { | |
268 | /* TODO: Create the FIFO if it doesn't already exist. */ | |
269 | if (lstat(s->in_fifo, &st) < 0) { | |
270 | khlib_error( | |
271 | "Cannot stat \"%s\". Error: %s\n", | |
272 | s->in_fifo, | |
273 | strerror(errno) | |
274 | ); | |
4e3d71e8 | 275 | slot_set_error(s, buf); |
4bfac488 SK |
276 | continue; |
277 | } | |
278 | if (!(st.st_mode & S_IFIFO)) { | |
279 | khlib_error("\"%s\" is not a FIFO\n", s->in_fifo); | |
4e3d71e8 | 280 | slot_set_error(s, buf); |
4bfac488 SK |
281 | continue; |
282 | } | |
283 | if (s->in_fd < 0) { | |
284 | khlib_debug( | |
285 | "%s: closed. opening. in_fd: %d\n", | |
286 | s->in_fifo, | |
287 | s->in_fd | |
288 | ); | |
289 | s->in_fd = open(s->in_fifo, O_RDONLY | O_NONBLOCK); | |
290 | } else { | |
291 | khlib_debug( | |
292 | "%s: already openned. in_fd: %d\n", | |
293 | s->in_fifo, | |
294 | s->in_fd | |
295 | ); | |
296 | } | |
297 | if (s->in_fd == -1) { | |
298 | /* TODO Consider backing off retries for failed slots */ | |
299 | khlib_error("Failed to open \"%s\"\n", s->in_fifo); | |
4e3d71e8 | 300 | slot_set_error(s, buf); |
4bfac488 SK |
301 | continue; |
302 | } | |
303 | khlib_debug("%s: open. in_fd: %d\n", s->in_fifo, s->in_fd); | |
304 | if (s->in_fd > maxfd) | |
305 | maxfd = s->in_fd; | |
306 | FD_SET(s->in_fd, &fds); | |
307 | } | |
308 | khlib_debug("selecting...\n"); | |
309 | ready = pselect(maxfd + 1, &fds, NULL, NULL, ti, NULL); | |
310 | khlib_debug("ready: %d\n", ready); | |
311 | clock_gettime(CLOCK_MONOTONIC, &t); | |
312 | if (ready == -1) { | |
313 | switch (errno) { | |
314 | case EINTR: | |
315 | khlib_error( | |
316 | "pselect temp failure: %d, errno: %d, msg: %s\n", | |
317 | ready, | |
318 | errno, | |
319 | strerror(errno) | |
320 | ); | |
321 | /* TODO: Reconsider what to do here. */ | |
322 | return; | |
323 | default: | |
324 | khlib_fatal( | |
325 | "pselect failed: %d, errno: %d, msg: %s\n", | |
326 | ready, | |
327 | errno, | |
328 | strerror(errno) | |
329 | ); | |
330 | } | |
331 | } | |
332 | /* At-least-once ensures that expiries are still checked on timeouts. */ | |
333 | do { | |
334 | for (s = cfg->slots; s; s = s->next) { | |
4e3d71e8 SK |
335 | if (s->in_fd < 0) |
336 | continue; | |
4bfac488 SK |
337 | if (FD_ISSET(s->in_fd, &fds)) { |
338 | khlib_debug("reading: %s\n", s->in_fifo); | |
51e63a6f | 339 | switch (slot_read(s, buf)) { |
4bfac488 SK |
340 | /* |
341 | * ### MESSAGE LOSS ### | |
342 | * is introduced by closing at EOM in addition | |
343 | * to EOF, since there may be unread messages | |
344 | * remaining in the pipe. However, | |
345 | * | |
346 | * ### INTER-MESSAGE PUSHBACK ### | |
347 | * is also gained, since pipes block at the | |
348 | * "open" call. | |
349 | * | |
350 | * This is an acceptable trade-off because we | |
351 | * are a stateless reporter of a _most-recent_ | |
352 | * status, not a stateful accumulator. | |
c21cacfe SK |
353 | * |
354 | * ### LOSSLESS ALTERNATIVES ### | |
355 | * - Read each pipe until EOF before reading | |
356 | * another. | |
357 | * PROBLEM: a fast writer can trap us in the | |
358 | * read loop. | |
359 | * | |
360 | * - Read each pipe until EOM, but close only | |
361 | * at EOF. | |
362 | * PROBLEM: a fast writer can fill the pipe | |
363 | * faster than we can read it and we end-up | |
364 | * displaying stale data. | |
365 | * | |
4bfac488 SK |
366 | */ |
367 | case END_OF_MESSAGE: | |
368 | case END_OF_FILE: | |
369 | case FAILURE: | |
370 | close(s->in_fd); | |
51e63a6f SK |
371 | s->in_fd = -1; |
372 | s->in_last_read = t; | |
373 | s->out_pos_cur = s->out_pos_lo; | |
4bfac488 SK |
374 | ready--; |
375 | break; | |
376 | case RETRY: | |
377 | break; | |
378 | default: | |
379 | assert(0); | |
380 | } | |
381 | } else { | |
382 | slot_expire(s, t, buf); | |
383 | } | |
384 | } | |
385 | } while (ready); | |
386 | assert(ready == 0); | |
387 | } | |
388 | ||
77c76070 | 389 | void |
457f091d | 390 | config_log(Config *cfg) |
77c76070 | 391 | { |
1084633a | 392 | khlib_info( |
a6b13fa2 SK |
393 | "Config " |
394 | "{" | |
348d5f36 | 395 | " interval = %f," |
a6b13fa2 | 396 | " separator = %s," |
900b9a6b | 397 | " slot_count = %d," |
457f091d | 398 | " buf_width = %d," |
900b9a6b | 399 | " slots = ..." |
a6b13fa2 SK |
400 | " }\n", |
401 | cfg->interval, | |
402 | cfg->separator, | |
900b9a6b | 403 | cfg->slot_count, |
457f091d | 404 | cfg->buf_width |
77c76070 | 405 | ); |
457f091d SK |
406 | slots_log(cfg->slots); |
407 | } | |
408 | ||
409 | void | |
410 | config_stretch_for_separators(Config *cfg) | |
411 | { | |
412 | int seplen = strlen(cfg->separator); | |
413 | int prefix = 0; | |
414 | int nslots = 0; | |
415 | Slot *s = cfg->slots; | |
416 | ||
417 | while (s) { | |
418 | s->out_pos_lo += prefix; | |
419 | s->out_pos_hi += prefix; | |
420 | s->out_pos_cur = s->out_pos_lo; | |
421 | prefix += seplen; | |
422 | nslots++; | |
423 | s = s->next; | |
424 | } | |
425 | cfg->buf_width += (seplen * (nslots - 1)); | |
77c76070 | 426 | } |
9b5ebc12 SK |
427 | |
428 | int | |
900b9a6b | 429 | is_pos_num(char *str) |
9b5ebc12 | 430 | { |
900b9a6b SK |
431 | while (*str != '\0') |
432 | if (!isdigit(*(str++))) | |
9b5ebc12 SK |
433 | return 0; |
434 | return 1; | |
435 | } | |
436 | ||
348d5f36 | 437 | int |
900b9a6b | 438 | is_decimal(char *str) |
348d5f36 SK |
439 | { |
440 | char c; | |
441 | int seen = 0; | |
442 | ||
900b9a6b | 443 | while ((c = *(str++)) != '\0') |
348d5f36 SK |
444 | if (!isdigit(c)) { |
445 | if (c == '.' && !seen++) | |
446 | continue; | |
447 | else | |
448 | return 0; | |
449 | } | |
450 | return 1; | |
451 | } | |
452 | ||
9b5ebc12 SK |
453 | void |
454 | print_usage() | |
455 | { | |
4d66492f | 456 | assert(argv0); |
9b5ebc12 | 457 | fprintf( |
a6b13fa2 SK |
458 | stderr, |
459 | "\n" | |
460 | "Usage: %s [OPTION ...] SPEC [SPEC ...]\n" | |
461 | "\n" | |
462 | " SPEC = FILE_PATH DATA_WIDTH DATA_TTL\n" | |
463 | " FILE_PATH = string\n" | |
464 | " DATA_WIDTH = int (* (positive) number of characters *)\n" | |
0a01172a | 465 | " DATA_TTL = float (* (positive) number of seconds *)\n" |
a6b13fa2 SK |
466 | " OPTION = -i INTERVAL\n" |
467 | " | -s SEPARATOR\n" | |
468 | " | -x (* Output to X root window *)\n" | |
469 | " | -l LOG_LEVEL\n" | |
470 | " SEPARATOR = string\n" | |
0a01172a | 471 | " INTERVAL = float (* (positive) number of seconds *)\n" |
a6b13fa2 SK |
472 | " LOG_LEVEL = int (* %d through %d *)\n" |
473 | "\n", | |
474 | argv0, | |
475 | Nothing, | |
476 | Debug | |
9b5ebc12 SK |
477 | ); |
478 | fprintf( | |
a6b13fa2 SK |
479 | stderr, |
480 | "Example: %s -i 1 /dev/shm/khatus/khatus_sensor_x 4 10\n" | |
481 | "\n", | |
482 | argv0 | |
9b5ebc12 SK |
483 | ); |
484 | } | |
485 | ||
544b0835 SK |
486 | /* For mutually-recursive calls. */ |
487 | void opts_parse_any(Config *, int, char *[], int); | |
9b5ebc12 SK |
488 | |
489 | void | |
4d66492f | 490 | parse_opts_opt_i(Config *cfg, int argc, char *argv[], int i) |
9b5ebc12 | 491 | { |
4c438cef SK |
492 | char *param; |
493 | ||
494 | if (i >= argc) | |
9b5ebc12 | 495 | usage("Option -i parameter is missing.\n"); |
4c438cef | 496 | param = argv[i++]; |
348d5f36 | 497 | if (!is_decimal(param)) |
4c438cef | 498 | usage("Option -i parameter is invalid: \"%s\"\n", param); |
348d5f36 | 499 | cfg->interval = atof(param); |
4c438cef | 500 | opts_parse_any(cfg, argc, argv, i); |
9b5ebc12 SK |
501 | } |
502 | ||
503 | void | |
4d66492f SK |
504 | parse_opts_opt_s(Config *cfg, int argc, char *argv[], int i) |
505 | { | |
4c438cef | 506 | if (i >= argc) |
4d66492f | 507 | usage("Option -s parameter is missing.\n"); |
4c438cef SK |
508 | cfg->separator = calloc((strlen(argv[i]) + 1), sizeof(char)); |
509 | strcpy(cfg->separator, argv[i]); | |
510 | opts_parse_any(cfg, argc, argv, ++i); | |
4d66492f SK |
511 | } |
512 | ||
b6316e94 SK |
513 | void |
514 | parse_opts_opt_l(Config *cfg, int argc, char *argv[], int i) | |
515 | { | |
4c438cef | 516 | char *param; |
b6316e94 SK |
517 | int log_level; |
518 | ||
4c438cef | 519 | if (i >= argc) |
b6316e94 | 520 | usage("Option -l parameter is missing.\n"); |
4c438cef SK |
521 | param = argv[i++]; |
522 | if (!is_pos_num(param)) | |
523 | usage("Option -l parameter is invalid: \"%s\"\n", param); | |
524 | log_level = atoi(param); | |
525 | if (log_level > Debug) | |
544b0835 SK |
526 | usage( |
527 | "Option -l value (%d) exceeds maximum (%d)\n", | |
528 | log_level, | |
529 | Debug | |
530 | ); | |
1084633a | 531 | _khlib_log_level = log_level; |
4c438cef | 532 | opts_parse_any(cfg, argc, argv, i); |
b6316e94 SK |
533 | } |
534 | ||
4d66492f SK |
535 | void |
536 | parse_opts_opt(Config *cfg, int argc, char *argv[], int i) | |
9b5ebc12 SK |
537 | { |
538 | switch (argv[i][1]) { | |
ce552549 SK |
539 | case 'i': |
540 | /* TODO: Generic set_int */ | |
541 | parse_opts_opt_i(cfg, argc, argv, ++i); | |
542 | break; | |
543 | case 's': | |
544 | /* TODO: Generic set_str */ | |
545 | parse_opts_opt_s(cfg, argc, argv, ++i); | |
546 | break; | |
547 | case 'x': | |
457f091d | 548 | cfg->to_x_root = 1; |
ce552549 SK |
549 | opts_parse_any(cfg, argc, argv, ++i); |
550 | break; | |
551 | case 'l': | |
552 | /* TODO: Generic set_int */ | |
553 | parse_opts_opt_l(cfg, argc, argv, ++i); | |
554 | break; | |
555 | default : | |
556 | usage("Option \"%s\" is invalid\n", argv[i]); | |
9b5ebc12 SK |
557 | } |
558 | } | |
559 | ||
560 | void | |
4d66492f | 561 | parse_opts_spec(Config *cfg, int argc, char *argv[], int i) |
9b5ebc12 | 562 | { |
ca7a3d6c SK |
563 | char *n; |
564 | char *w; | |
565 | char *t; | |
566 | struct timespec in_last_read; | |
567 | Slot *s; | |
568 | ||
9b5ebc12 | 569 | if ((i + 3) > argc) |
544b0835 SK |
570 | usage( |
571 | "[spec] Parameter(s) missing for fifo \"%s\".\n", | |
572 | argv[i] | |
573 | ); | |
9b5ebc12 | 574 | |
ca7a3d6c SK |
575 | n = argv[i++]; |
576 | w = argv[i++]; | |
577 | t = argv[i++]; | |
0a01172a | 578 | |
9b5ebc12 | 579 | if (!is_pos_num(w)) |
1872c5c1 | 580 | usage("[spec] Invalid width: \"%s\", for fifo \"%s\"\n", w, n); |
0a01172a | 581 | if (!is_decimal(t)) |
1872c5c1 | 582 | usage("[spec] Invalid TTL: \"%s\", for fifo \"%s\"\n", t, n); |
ca7a3d6c | 583 | |
900b9a6b SK |
584 | in_last_read.tv_sec = 0; |
585 | in_last_read.tv_nsec = 0; | |
ca7a3d6c SK |
586 | s = calloc(1, sizeof(struct Slot)); |
587 | ||
900b9a6b SK |
588 | if (s) { |
589 | s->in_fifo = n; | |
590 | s->in_fd = -1; | |
ca7a3d6c SK |
591 | s->out_width = atoi(w); |
592 | s->out_ttl = khlib_timespec_of_float(atof(t)); | |
900b9a6b | 593 | s->in_last_read = in_last_read; |
457f091d | 594 | s->out_pos_lo = cfg->buf_width; |
900b9a6b | 595 | s->out_pos_cur = s->out_pos_lo; |
ca7a3d6c SK |
596 | s->out_pos_hi = s->out_pos_lo + s->out_width - 1; |
597 | s->next = cfg->slots; | |
900b9a6b SK |
598 | |
599 | cfg->slots = s; | |
457f091d | 600 | cfg->buf_width += s->out_width; |
900b9a6b | 601 | cfg->slot_count++; |
9b5ebc12 | 602 | } else { |
1084633a | 603 | khlib_fatal("[memory] Allocation failure."); |
9b5ebc12 | 604 | } |
4d66492f | 605 | opts_parse_any(cfg, argc, argv, i); |
9b5ebc12 SK |
606 | } |
607 | ||
608 | void | |
4d66492f | 609 | opts_parse_any(Config *cfg, int argc, char *argv[], int i) |
9b5ebc12 SK |
610 | { |
611 | if (i < argc) { | |
612 | switch (argv[i][0]) { | |
ce552549 SK |
613 | case '-': |
614 | parse_opts_opt(cfg, argc, argv, i); | |
615 | break; | |
616 | default : | |
617 | parse_opts_spec(cfg, argc, argv, i); | |
4d66492f SK |
618 | } |
619 | } | |
620 | } | |
621 | ||
622 | void | |
5400b86f | 623 | opts_parse(Config *cfg, int argc, char *argv[]) |
4d66492f SK |
624 | { |
625 | opts_parse_any(cfg, argc, argv, 1); | |
ca7a3d6c | 626 | cfg->slots = slots_rev(cfg->slots); |
457f091d SK |
627 | config_log(cfg); |
628 | if (cfg->slots == NULL) | |
629 | usage("No slot specs were given!\n"); | |
4d66492f SK |
630 | } |
631 | ||
457f091d SK |
632 | void |
633 | loop(Config *cfg, char *buf, Display *d) | |
9b5ebc12 | 634 | { |
b7487ec5 | 635 | struct timespec |
900b9a6b SK |
636 | t0, /* time stamp. before reading slots */ |
637 | t1, /* time stamp. after reading slots */ | |
b7487ec5 SK |
638 | ti, /* time interval desired (t1 - t0) */ |
639 | td, /* time interval measured (t1 - t0) */ | |
640 | tc; /* time interval correction (ti - td) when td < ti */ | |
4d66492f | 641 | |
457f091d | 642 | ti = khlib_timespec_of_float(cfg->interval); |
4d66492f | 643 | for (;;) { |
b7487ec5 | 644 | clock_gettime(CLOCK_MONOTONIC, &t0); // FIXME: check errors |
457f091d SK |
645 | slots_read(cfg, &ti, buf); |
646 | if (cfg->to_x_root) { | |
544b0835 | 647 | if (XStoreName(d, DefaultRootWindow(d), buf) < 0) |
1084633a | 648 | khlib_fatal("XStoreName failed.\n"); |
544b0835 | 649 | XFlush(d); |
fabb8771 SK |
650 | } else { |
651 | puts(buf); | |
652 | fflush(stdout); | |
653 | } | |
b7487ec5 SK |
654 | clock_gettime(CLOCK_MONOTONIC, &t1); // FIXME: check errors |
655 | timespecsub(&t1, &t0, &td); | |
1084633a | 656 | khlib_debug( |
544b0835 SK |
657 | "td {tv_sec = %ld, tv_nsec = %ld}\n", |
658 | td.tv_sec, | |
659 | td.tv_nsec | |
660 | ); | |
a415999c | 661 | if (timespeccmp(&td, &ti, <)) { |
ca7a3d6c SK |
662 | /* |
663 | * Pushback on data producers by refusing to read the | |
b7487ec5 SK |
664 | * pipe more frequently than the interval. |
665 | */ | |
666 | timespecsub(&ti, &td, &tc); | |
1084633a | 667 | khlib_sleep(&tc); |
574a4bff | 668 | } |
4d66492f | 669 | } |
457f091d SK |
670 | } |
671 | ||
672 | int | |
673 | main(int argc, char *argv[]) | |
674 | { | |
675 | Config cfg = { | |
676 | .interval = 1.0, | |
677 | .separator = "|", | |
678 | .slots = NULL, | |
679 | .slot_count = 0, | |
680 | .buf_width = 0, | |
681 | .to_x_root = 0, | |
682 | }; | |
683 | char *buf; | |
684 | Display *d = NULL; | |
685 | ||
686 | /* TODO: Handle signals */ | |
687 | ||
688 | argv0 = argv[0]; | |
689 | opts_parse(&cfg, argc, argv); | |
690 | slots_assert_fifos_exist(cfg.slots); | |
691 | config_stretch_for_separators(&cfg); | |
692 | buf = buf_create(&cfg); | |
693 | if (cfg.to_x_root && !(d = XOpenDisplay(NULL))) | |
694 | khlib_fatal("XOpenDisplay failed with: %p\n", d); | |
695 | loop(&cfg, buf, d); | |
3d7e82a8 | 696 | return EXIT_SUCCESS; |
9b5ebc12 | 697 | } |