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" |
17a27e48 SK |
17 | #include "khatus_lib_log.h" |
18 | #include "khatus_lib_time.h" | |
b7487ec5 | 19 | |
17a27e48 | 20 | #define usage(...) {print_usage(); fprintf(stderr, "Error:\n " __VA_ARGS__); exit(EXIT_FAILURE);} |
e6c523cd SK |
21 | #define ERRMSG "ERROR" |
22 | ||
23 | static const char errmsg[] = ERRMSG; | |
24 | static const int errlen = sizeof(ERRMSG) - 1; | |
25 | ||
4d66492f | 26 | char *argv0; |
9b5ebc12 | 27 | |
1872c5c1 SK |
28 | /* TODO: Convert fifo list to fifo array. */ |
29 | typedef struct Fifo Fifo; | |
30 | struct Fifo { | |
4d66492f SK |
31 | char *name; |
32 | int fd; | |
9b5ebc12 | 33 | int width; |
4d66492f | 34 | int last_read; |
9b5ebc12 | 35 | int ttl; |
4d66492f | 36 | int pos; /* Position on the output buffer. */ |
1872c5c1 | 37 | Fifo *next; |
9b5ebc12 SK |
38 | }; |
39 | ||
4d66492f SK |
40 | typedef struct Config Config; |
41 | struct Config { | |
348d5f36 | 42 | double interval; |
4d66492f | 43 | char * separator; |
1872c5c1 SK |
44 | Fifo * fifos; |
45 | int fifo_count; | |
4d66492f | 46 | int total_width; |
fabb8771 | 47 | int output_to_x_root_window; |
4d66492f | 48 | } defaults = { |
348d5f36 | 49 | .interval = 1.0, |
4d66492f | 50 | .separator = "|", |
1872c5c1 SK |
51 | .fifos = NULL, |
52 | .fifo_count = 0, | |
4d66492f | 53 | .total_width = 0, |
fabb8771 | 54 | .output_to_x_root_window = 0, |
9b5ebc12 SK |
55 | }; |
56 | ||
77c76070 | 57 | void |
17a27e48 | 58 | fifo_print_one(Fifo *f) |
77c76070 | 59 | { |
a6b13fa2 SK |
60 | info("Fifo " |
61 | "{" | |
62 | " name = %s," | |
63 | " fd = %d," | |
64 | " width = %d," | |
65 | " last_read = %d," | |
66 | " ttl = %d," | |
67 | " pos = %d," | |
68 | " next = %p," | |
69 | " }\n", | |
70 | f->name, | |
71 | f->fd, | |
72 | f->width, | |
73 | f->last_read, | |
74 | f->ttl, | |
75 | f->pos, | |
76 | f->next | |
77c76070 SK |
77 | ); |
78 | } | |
79 | ||
80 | void | |
17a27e48 | 81 | fifo_print_all(Fifo *head) |
77c76070 | 82 | { |
1872c5c1 | 83 | for (Fifo *f = head; f; f = f->next) { |
17a27e48 | 84 | fifo_print_one(f); |
77c76070 SK |
85 | } |
86 | } | |
87 | ||
88 | void | |
b6316e94 | 89 | config_print(Config *cfg) |
77c76070 | 90 | { |
b6316e94 | 91 | info( |
a6b13fa2 SK |
92 | "Config " |
93 | "{" | |
348d5f36 | 94 | " interval = %f," |
a6b13fa2 SK |
95 | " separator = %s," |
96 | " fifo_count = %d," | |
97 | " total_width = %d," | |
a6b13fa2 SK |
98 | " fifos = ..." |
99 | " }\n", | |
100 | cfg->interval, | |
101 | cfg->separator, | |
102 | cfg->fifo_count, | |
17a27e48 | 103 | cfg->total_width |
77c76070 | 104 | ); |
17a27e48 | 105 | fifo_print_all(cfg->fifos); |
77c76070 | 106 | } |
9b5ebc12 SK |
107 | |
108 | int | |
109 | is_pos_num(char *s) | |
110 | { | |
111 | while (*s != '\0') | |
112 | if (!isdigit(*(s++))) | |
113 | return 0; | |
114 | return 1; | |
115 | } | |
116 | ||
348d5f36 SK |
117 | int |
118 | is_decimal(char *s) | |
119 | { | |
120 | char c; | |
121 | int seen = 0; | |
122 | ||
123 | while ((c = *(s++)) != '\0') | |
124 | if (!isdigit(c)) { | |
125 | if (c == '.' && !seen++) | |
126 | continue; | |
127 | else | |
128 | return 0; | |
129 | } | |
130 | return 1; | |
131 | } | |
132 | ||
9b5ebc12 SK |
133 | void |
134 | print_usage() | |
135 | { | |
4d66492f | 136 | assert(argv0); |
9b5ebc12 | 137 | fprintf( |
a6b13fa2 SK |
138 | stderr, |
139 | "\n" | |
140 | "Usage: %s [OPTION ...] SPEC [SPEC ...]\n" | |
141 | "\n" | |
142 | " SPEC = FILE_PATH DATA_WIDTH DATA_TTL\n" | |
143 | " FILE_PATH = string\n" | |
144 | " DATA_WIDTH = int (* (positive) number of characters *)\n" | |
145 | " DATA_TTL = int (* (positive) number of seconds *)\n" | |
146 | " OPTION = -i INTERVAL\n" | |
147 | " | -s SEPARATOR\n" | |
148 | " | -x (* Output to X root window *)\n" | |
149 | " | -l LOG_LEVEL\n" | |
150 | " SEPARATOR = string\n" | |
151 | " INTERVAL = int (* (positive) number of seconds *)\n" | |
152 | " LOG_LEVEL = int (* %d through %d *)\n" | |
153 | "\n", | |
154 | argv0, | |
155 | Nothing, | |
156 | Debug | |
9b5ebc12 SK |
157 | ); |
158 | fprintf( | |
a6b13fa2 SK |
159 | stderr, |
160 | "Example: %s -i 1 /dev/shm/khatus/khatus_sensor_x 4 10\n" | |
161 | "\n", | |
162 | argv0 | |
9b5ebc12 SK |
163 | ); |
164 | } | |
165 | ||
4d66492f | 166 | void opts_parse_any(Config *, int, char *[], int); /* For mutually-recursive calls. */ |
9b5ebc12 SK |
167 | |
168 | void | |
4d66492f | 169 | parse_opts_opt_i(Config *cfg, int argc, char *argv[], int i) |
9b5ebc12 | 170 | { |
4c438cef SK |
171 | char *param; |
172 | ||
173 | if (i >= argc) | |
9b5ebc12 | 174 | usage("Option -i parameter is missing.\n"); |
4c438cef | 175 | param = argv[i++]; |
348d5f36 | 176 | if (!is_decimal(param)) |
4c438cef | 177 | usage("Option -i parameter is invalid: \"%s\"\n", param); |
348d5f36 | 178 | cfg->interval = atof(param); |
4c438cef | 179 | opts_parse_any(cfg, argc, argv, i); |
9b5ebc12 SK |
180 | } |
181 | ||
182 | void | |
4d66492f SK |
183 | parse_opts_opt_s(Config *cfg, int argc, char *argv[], int i) |
184 | { | |
4c438cef | 185 | if (i >= argc) |
4d66492f | 186 | usage("Option -s parameter is missing.\n"); |
4c438cef SK |
187 | cfg->separator = calloc((strlen(argv[i]) + 1), sizeof(char)); |
188 | strcpy(cfg->separator, argv[i]); | |
189 | opts_parse_any(cfg, argc, argv, ++i); | |
4d66492f SK |
190 | } |
191 | ||
b6316e94 SK |
192 | void |
193 | parse_opts_opt_l(Config *cfg, int argc, char *argv[], int i) | |
194 | { | |
4c438cef | 195 | char *param; |
b6316e94 SK |
196 | int log_level; |
197 | ||
4c438cef | 198 | if (i >= argc) |
b6316e94 | 199 | usage("Option -l parameter is missing.\n"); |
4c438cef SK |
200 | param = argv[i++]; |
201 | if (!is_pos_num(param)) | |
202 | usage("Option -l parameter is invalid: \"%s\"\n", param); | |
203 | log_level = atoi(param); | |
204 | if (log_level > Debug) | |
205 | usage("Option -l value (%d) exceeds maximum (%d)\n", log_level, Debug); | |
17a27e48 | 206 | _khatus_lib_log_level = log_level; |
4c438cef | 207 | opts_parse_any(cfg, argc, argv, i); |
b6316e94 SK |
208 | } |
209 | ||
4d66492f SK |
210 | void |
211 | parse_opts_opt(Config *cfg, int argc, char *argv[], int i) | |
9b5ebc12 SK |
212 | { |
213 | switch (argv[i][1]) { | |
ce552549 SK |
214 | case 'i': |
215 | /* TODO: Generic set_int */ | |
216 | parse_opts_opt_i(cfg, argc, argv, ++i); | |
217 | break; | |
218 | case 's': | |
219 | /* TODO: Generic set_str */ | |
220 | parse_opts_opt_s(cfg, argc, argv, ++i); | |
221 | break; | |
222 | case 'x': | |
223 | cfg->output_to_x_root_window = 1; | |
224 | opts_parse_any(cfg, argc, argv, ++i); | |
225 | break; | |
226 | case 'l': | |
227 | /* TODO: Generic set_int */ | |
228 | parse_opts_opt_l(cfg, argc, argv, ++i); | |
229 | break; | |
230 | default : | |
231 | usage("Option \"%s\" is invalid\n", argv[i]); | |
9b5ebc12 SK |
232 | } |
233 | } | |
234 | ||
235 | void | |
4d66492f | 236 | parse_opts_spec(Config *cfg, int argc, char *argv[], int i) |
9b5ebc12 SK |
237 | { |
238 | if ((i + 3) > argc) | |
1872c5c1 | 239 | usage("[spec] Parameter(s) missing for fifo \"%s\".\n", argv[i]); |
9b5ebc12 SK |
240 | |
241 | char *n = argv[i++]; | |
242 | char *w = argv[i++]; | |
243 | char *t = argv[i++]; | |
244 | ||
245 | if (!is_pos_num(w)) | |
1872c5c1 | 246 | usage("[spec] Invalid width: \"%s\", for fifo \"%s\"\n", w, n); |
9b5ebc12 | 247 | if (!is_pos_num(t)) |
1872c5c1 SK |
248 | usage("[spec] Invalid TTL: \"%s\", for fifo \"%s\"\n", t, n); |
249 | Fifo *f = calloc(1, sizeof(struct Fifo)); | |
9b5ebc12 | 250 | if (f) { |
4d66492f SK |
251 | f->name = n; |
252 | f->fd = -1; | |
253 | f->width = atoi(w); | |
254 | f->ttl = atoi(t); | |
255 | f->last_read = 0; | |
256 | f->pos = cfg->total_width; | |
1872c5c1 | 257 | f->next = cfg->fifos; |
4d66492f | 258 | |
1872c5c1 | 259 | cfg->fifos = f; |
4d66492f | 260 | cfg->total_width += f->width; |
1872c5c1 | 261 | cfg->fifo_count++; |
9b5ebc12 | 262 | } else { |
4d66492f | 263 | fatal("[memory] Allocation failure."); |
9b5ebc12 | 264 | } |
4d66492f | 265 | opts_parse_any(cfg, argc, argv, i); |
9b5ebc12 SK |
266 | } |
267 | ||
268 | void | |
4d66492f | 269 | opts_parse_any(Config *cfg, int argc, char *argv[], int i) |
9b5ebc12 SK |
270 | { |
271 | if (i < argc) { | |
272 | switch (argv[i][0]) { | |
ce552549 SK |
273 | case '-': |
274 | parse_opts_opt(cfg, argc, argv, i); | |
275 | break; | |
276 | default : | |
277 | parse_opts_spec(cfg, argc, argv, i); | |
4d66492f SK |
278 | } |
279 | } | |
280 | } | |
281 | ||
282 | void | |
5400b86f | 283 | opts_parse(Config *cfg, int argc, char *argv[]) |
4d66492f SK |
284 | { |
285 | opts_parse_any(cfg, argc, argv, 1); | |
286 | ||
1872c5c1 SK |
287 | Fifo *last = cfg->fifos; |
288 | cfg->fifos = NULL; | |
289 | for (Fifo *f = last; f; ) { | |
290 | Fifo *next = f->next; | |
291 | f->next = cfg->fifos; | |
292 | cfg->fifos = f; | |
4d66492f SK |
293 | f = next; |
294 | } | |
295 | } | |
296 | ||
e6c523cd | 297 | void |
69b75a40 | 298 | fifo_read_error(Fifo *f, char *buf) |
e6c523cd SK |
299 | { |
300 | char *b; | |
301 | int i; | |
302 | ||
303 | b = buf + f->pos; | |
304 | /* Copy as much of the error message as possible. | |
305 | * EXCLUDING the reminating \0. */ | |
306 | for (i = 0; i < errlen && i < f->width; i++) | |
307 | b[i] = errmsg[i]; | |
308 | /* Any remaining slots: */ | |
309 | for (; i < f->width; i++) | |
310 | b[i] = '_'; | |
311 | } | |
312 | ||
77c76070 | 313 | void |
17a27e48 | 314 | fifo_read_one(Fifo *f, char *buf) |
77c76070 | 315 | { |
3efcce25 SK |
316 | ssize_t current; |
317 | ssize_t total; | |
77c76070 | 318 | char *b; |
3efcce25 | 319 | char c; |
77c76070 | 320 | |
3efcce25 SK |
321 | current = 0; |
322 | total = 0; | |
323 | c = '\0'; | |
77c76070 | 324 | b = buf + f->pos; |
3efcce25 SK |
325 | while ((current = read(f->fd, &c, 1)) && c != '\n' && c != '\0' && total++ < f->width) |
326 | *b++ = c; | |
e6c523cd | 327 | if (current == -1) { |
3efcce25 | 328 | error("Failed to read: \"%s\". Error: %s\n", f->name, strerror(errno)); |
69b75a40 | 329 | fifo_read_error(f, buf); |
574a4bff | 330 | } else { |
7fb02106 SK |
331 | while (total++ < f->width) |
332 | *b++ = ' '; | |
574a4bff | 333 | } |
6c29392d | 334 | /* TODO Record timestamp read */ |
77c76070 SK |
335 | close(f->fd); |
336 | f->fd = -1; | |
337 | } | |
338 | ||
4d66492f | 339 | void |
69b75a40 | 340 | fifo_read_all(Config *cfg, char *buf) |
4d66492f | 341 | { |
77c76070 | 342 | fd_set fds; |
bfab34f8 | 343 | int maxfd = -1; |
77c76070 | 344 | int ready; |
bec93767 | 345 | struct stat st; |
77c76070 SK |
346 | |
347 | FD_ZERO(&fds); | |
1872c5c1 | 348 | for (Fifo *f = cfg->fifos; f; f = f->next) { |
bec93767 | 349 | /* TODO: Create the FIFO if it doesn't already exist. */ |
e6c523cd SK |
350 | if (lstat(f->name, &st) < 0) { |
351 | error("Cannot stat \"%s\". Error: %s\n", f->name, strerror(errno)); | |
69b75a40 | 352 | fifo_read_error(f, buf); |
e6c523cd SK |
353 | continue; |
354 | } | |
355 | if (!(st.st_mode & S_IFIFO)) { | |
356 | error("\"%s\" is not a FIFO\n", f->name); | |
69b75a40 | 357 | fifo_read_error(f, buf); |
e6c523cd SK |
358 | continue; |
359 | } | |
77c76070 | 360 | debug("opening: %s\n", f->name); |
4d66492f | 361 | if (f->fd < 0) |
77c76070 | 362 | f->fd = open(f->name, O_RDONLY | O_NONBLOCK); |
e6c523cd | 363 | if (f->fd == -1) { |
1872c5c1 | 364 | /* TODO: Consider backing off retries for failed fifos. */ |
e6c523cd | 365 | error("Failed to open \"%s\"\n", f->name); |
69b75a40 | 366 | fifo_read_error(f, buf); |
e6c523cd SK |
367 | continue; |
368 | } | |
77c76070 SK |
369 | if (f->fd > maxfd) |
370 | maxfd = f->fd; | |
371 | FD_SET(f->fd, &fds); | |
372 | } | |
373 | debug("selecting...\n"); | |
374 | ready = select(maxfd + 1, &fds, NULL, NULL, NULL); | |
375 | debug("ready: %d\n", ready); | |
376 | assert(ready != 0); | |
377 | if (ready < 0) | |
378 | fatal("%s", strerror(errno)); | |
1872c5c1 | 379 | for (Fifo *f = cfg->fifos; f; f = f->next) { |
77c76070 SK |
380 | if (FD_ISSET(f->fd, &fds)) { |
381 | debug("reading: %s\n", f->name); | |
17a27e48 | 382 | fifo_read_one(f, buf); |
b7487ec5 SK |
383 | } |
384 | } | |
385 | } | |
386 | ||
9b5ebc12 | 387 | int |
4d66492f | 388 | main(int argc, char *argv[]) |
9b5ebc12 | 389 | { |
f277f405 | 390 | int width = 0; |
1872c5c1 | 391 | int nfifos = 0; |
f277f405 | 392 | int seplen = 0; |
4d66492f | 393 | int prefix = 0; |
e6c523cd | 394 | int errors = 0; |
4d66492f | 395 | char *buf; |
a6d4c9c3 SK |
396 | Config cfg0 = defaults; |
397 | Config *cfg = &cfg0; | |
bfab34f8 | 398 | Display *display = NULL; |
e6c523cd | 399 | struct stat st; |
b7487ec5 SK |
400 | struct timespec |
401 | t0, /* time stamp. before reading fifos */ | |
402 | t1, /* time stamp. after reading fifos */ | |
403 | ti, /* time interval desired (t1 - t0) */ | |
404 | td, /* time interval measured (t1 - t0) */ | |
405 | tc; /* time interval correction (ti - td) when td < ti */ | |
4d66492f SK |
406 | |
407 | argv0 = argv[0]; | |
408 | ||
5400b86f | 409 | opts_parse(cfg, argc, argv); |
4d66492f | 410 | debug("argv0 = %s\n", argv0); |
77c76070 | 411 | config_print(cfg); |
b7487ec5 | 412 | |
348d5f36 | 413 | ti = timespec_of_float(cfg->interval); |
b7487ec5 | 414 | |
1872c5c1 SK |
415 | if (cfg->fifos == NULL) |
416 | usage("No fifo specs were given!\n"); | |
4d66492f | 417 | |
e6c523cd SK |
418 | /* 1st pass to check file existence and type */ |
419 | for (Fifo *f = cfg->fifos; f; f = f->next) { | |
420 | if (lstat(f->name, &st) < 0) { | |
421 | error("Cannot stat \"%s\". Error: %s\n", f->name, strerror(errno)); | |
422 | errors++; | |
423 | continue; | |
424 | } | |
425 | if (!(st.st_mode & S_IFIFO)) { | |
426 | error("\"%s\" is not a FIFO\n", f->name); | |
427 | errors++; | |
428 | continue; | |
429 | } | |
430 | } | |
431 | if (errors) | |
432 | fatal("Encountered errors with the given file paths. See log.\n"); | |
433 | ||
4d66492f SK |
434 | width = cfg->total_width; |
435 | seplen = strlen(cfg->separator); | |
436 | ||
e6c523cd | 437 | /* 2nd pass to make space for separators */ |
1872c5c1 | 438 | for (Fifo *f = cfg->fifos; f; f = f->next) { |
4d66492f SK |
439 | f->pos += prefix; |
440 | prefix += seplen; | |
1872c5c1 | 441 | nfifos++; |
4d66492f | 442 | } |
1872c5c1 | 443 | width += (seplen * (nfifos - 1)); |
3c836bfd | 444 | buf = calloc(1, width + 1); |
4d66492f SK |
445 | if (buf == NULL) |
446 | fatal("[memory] Failed to allocate buffer of %d bytes", width); | |
447 | memset(buf, ' ', width); | |
448 | buf[width] = '\0'; | |
e6c523cd | 449 | /* 3rd pass to set the separators */ |
1872c5c1 | 450 | for (Fifo *f = cfg->fifos; f; f = f->next) { |
4d66492f | 451 | if (f->pos) { /* Skip the first, left-most */ |
77c76070 SK |
452 | /* Copying only seplen ensures we omit the '\0' byte. */ |
453 | strncpy(buf + (f->pos - seplen), cfg->separator, seplen); | |
4d66492f SK |
454 | } |
455 | } | |
456 | ||
fabb8771 SK |
457 | if (cfg->output_to_x_root_window && !(display = XOpenDisplay(NULL))) |
458 | fatal("XOpenDisplay failed with: %p\n", display); | |
805f0d22 | 459 | /* TODO: Handle signals */ |
4d66492f | 460 | for (;;) { |
b7487ec5 SK |
461 | clock_gettime(CLOCK_MONOTONIC, &t0); // FIXME: check errors |
462 | /* TODO: Cache expiration. i.e. use the TTL */ | |
6c29392d | 463 | /* TODO: How to trigger TTL check? On select? Alarm signal? */ |
69b75a40 SK |
464 | /* TODO: Set timeout on fifo_read_all based on diff of last time of |
465 | * fifo_read_all and desired time of next TTL check. | |
b7487ec5 SK |
466 | */ |
467 | /* TODO: How long to wait on IO? Max TTL? */ | |
69b75a40 | 468 | fifo_read_all(cfg, buf); |
fabb8771 SK |
469 | if (cfg->output_to_x_root_window) { |
470 | if (XStoreName(display, DefaultRootWindow(display), buf) < 0) | |
471 | fatal("XStoreName failed.\n"); | |
472 | XFlush(display); | |
473 | } else { | |
474 | puts(buf); | |
475 | fflush(stdout); | |
476 | } | |
b7487ec5 SK |
477 | clock_gettime(CLOCK_MONOTONIC, &t1); // FIXME: check errors |
478 | timespecsub(&t1, &t0, &td); | |
479 | debug("td {tv_sec = %ld, tv_nsec = %ld}\n", td.tv_sec, td.tv_nsec); | |
480 | if (timespeccmp(&td, &ti, <)) { | |
481 | /* Pushback on data producers by refusing to read the | |
482 | * pipe more frequently than the interval. | |
483 | */ | |
484 | timespecsub(&ti, &td, &tc); | |
485 | debug("snooze YES\n"); | |
17a27e48 | 486 | snooze(&tc); |
574a4bff | 487 | } else { |
b7487ec5 | 488 | debug("snooze NO\n"); |
574a4bff | 489 | } |
4d66492f | 490 | } |
3d7e82a8 SK |
491 | |
492 | return EXIT_SUCCESS; | |
9b5ebc12 | 493 | } |