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d26e3629 KY |
1 | /* Linux-specific functions to retrieve OS data. |
2 | ||
3 | Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #ifdef GDBSERVER | |
21 | #include "server.h" | |
22 | #else | |
23 | #include "defs.h" | |
24 | #endif | |
25 | ||
26 | #include "linux-osdata.h" | |
27 | ||
28 | #include <sys/types.h> | |
29 | #include <sys/stat.h> | |
30 | #include <dirent.h> | |
31 | #include <ctype.h> | |
32 | #include <stdlib.h> | |
33 | #include <string.h> | |
34 | #include <utmp.h> | |
35 | #include <time.h> | |
36 | #include <unistd.h> | |
37 | #include <pwd.h> | |
38 | #include <grp.h> | |
39 | #include <netdb.h> | |
40 | #include <netinet/in.h> | |
41 | #include <arpa/inet.h> | |
42 | ||
43 | #include "xml-utils.h" | |
44 | #include "buffer.h" | |
45 | #include "gdb_assert.h" | |
46 | #include "gdb_dirent.h" | |
47 | ||
48 | int | |
49 | linux_common_core_of_thread (ptid_t ptid) | |
50 | { | |
51 | char filename[sizeof ("/proc//task//stat") | |
52 | + 2 * 20 /* decimal digits for 2 numbers, max 2^64 bit each */ | |
53 | + 1]; | |
54 | FILE *f; | |
55 | char *content = NULL; | |
56 | char *p; | |
57 | char *ts = 0; | |
58 | int content_read = 0; | |
59 | int i; | |
60 | int core; | |
61 | ||
62 | sprintf (filename, "/proc/%d/task/%ld/stat", | |
63 | ptid_get_pid (ptid), ptid_get_lwp (ptid)); | |
64 | f = fopen (filename, "r"); | |
65 | if (!f) | |
66 | return -1; | |
67 | ||
68 | for (;;) | |
69 | { | |
70 | int n; | |
71 | content = xrealloc (content, content_read + 1024); | |
72 | n = fread (content + content_read, 1, 1024, f); | |
73 | content_read += n; | |
74 | if (n < 1024) | |
75 | { | |
76 | content[content_read] = '\0'; | |
77 | break; | |
78 | } | |
79 | } | |
80 | ||
81 | p = strchr (content, '('); | |
82 | ||
83 | /* Skip ")". */ | |
84 | if (p != NULL) | |
85 | p = strchr (p, ')'); | |
86 | if (p != NULL) | |
87 | p++; | |
88 | ||
89 | /* If the first field after program name has index 0, then core number is | |
90 | the field with index 36. There's no constant for that anywhere. */ | |
91 | if (p != NULL) | |
92 | p = strtok_r (p, " ", &ts); | |
93 | for (i = 0; p != NULL && i != 36; ++i) | |
94 | p = strtok_r (NULL, " ", &ts); | |
95 | ||
96 | if (p == NULL || sscanf (p, "%d", &core) == 0) | |
97 | core = -1; | |
98 | ||
99 | xfree (content); | |
100 | fclose (f); | |
101 | ||
102 | return core; | |
103 | } | |
104 | ||
105 | static void | |
106 | command_from_pid (char *command, int maxlen, pid_t pid) | |
107 | { | |
108 | char *stat_path = xstrprintf ("/proc/%d/stat", pid); | |
109 | FILE *fp = fopen (stat_path, "r"); | |
110 | ||
111 | command[0] = '\0'; | |
112 | ||
113 | if (fp) | |
114 | { | |
115 | /* sizeof (cmd) should be greater or equal to TASK_COMM_LEN (in | |
116 | include/linux/sched.h in the Linux kernel sources) plus two | |
117 | (for the brackets). */ | |
118 | char cmd[32]; | |
119 | pid_t stat_pid; | |
120 | int items_read = fscanf (fp, "%d %32s", &stat_pid, cmd); | |
121 | ||
122 | if (items_read == 2 && pid == stat_pid) | |
123 | { | |
124 | cmd[strlen (cmd) - 1] = '\0'; /* Remove trailing parenthesis. */ | |
125 | strncpy (command, cmd + 1, maxlen); /* Ignore leading parenthesis. */ | |
126 | } | |
127 | ||
128 | fclose (fp); | |
129 | } | |
130 | else | |
131 | { | |
132 | /* Return the PID if a /proc entry for the process cannot be found. */ | |
133 | snprintf (command, maxlen, "%d", pid); | |
134 | } | |
135 | ||
136 | command[maxlen - 1] = '\0'; /* Ensure string is null-terminated. */ | |
137 | ||
138 | xfree (stat_path); | |
139 | } | |
140 | ||
141 | /* Returns the command-line of the process with the given PID. The returned | |
142 | string needs to be freed using xfree after use. */ | |
143 | ||
144 | static char * | |
145 | commandline_from_pid (pid_t pid) | |
146 | { | |
147 | char *pathname = xstrprintf ("/proc/%d/cmdline", pid); | |
148 | char *commandline = NULL; | |
149 | FILE *f = fopen (pathname, "r"); | |
150 | ||
151 | if (f) | |
152 | { | |
153 | size_t len = 0; | |
154 | ||
155 | while (!feof (f)) | |
156 | { | |
157 | char buf[1024]; | |
158 | size_t read_bytes = fread (buf, 1, sizeof (buf), f); | |
159 | ||
160 | if (read_bytes) | |
161 | { | |
162 | commandline = (char *) xrealloc (commandline, len + read_bytes + 1); | |
163 | memcpy (commandline + len, buf, read_bytes); | |
164 | len += read_bytes; | |
165 | } | |
166 | } | |
167 | ||
168 | fclose (f); | |
169 | ||
170 | if (commandline) | |
171 | { | |
172 | size_t i; | |
173 | ||
174 | /* Replace null characters with spaces. */ | |
175 | for (i = 0; i < len; ++i) | |
176 | if (commandline[i] == '\0') | |
177 | commandline[i] = ' '; | |
178 | ||
179 | commandline[len] = '\0'; | |
180 | } | |
181 | else | |
182 | { | |
183 | /* Return the command in square brackets if the command-line is empty. */ | |
184 | commandline = (char *) xmalloc (32); | |
185 | commandline[0] = '['; | |
186 | command_from_pid (commandline + 1, 31, pid); | |
187 | ||
188 | len = strlen (commandline); | |
189 | if (len < 31) | |
190 | strcat (commandline, "]"); | |
191 | } | |
192 | } | |
193 | ||
194 | xfree (pathname); | |
195 | ||
196 | return commandline; | |
197 | } | |
198 | ||
199 | static void | |
200 | user_from_uid (char *user, int maxlen, uid_t uid) | |
201 | { | |
202 | struct passwd *pwentry = getpwuid (uid); | |
203 | ||
204 | if (pwentry) | |
205 | { | |
206 | strncpy (user, pwentry->pw_name, maxlen); | |
207 | user[maxlen - 1] = '\0'; /* Ensure that the user name is null-terminated. */ | |
208 | } | |
209 | else | |
210 | user[0] = '\0'; | |
211 | } | |
212 | ||
213 | static int | |
214 | get_process_owner (uid_t *owner, pid_t pid) | |
215 | { | |
216 | struct stat statbuf; | |
217 | char procentry[sizeof ("/proc/4294967295")]; | |
218 | ||
219 | sprintf (procentry, "/proc/%d", pid); | |
220 | ||
221 | if (stat (procentry, &statbuf) == 0 && S_ISDIR (statbuf.st_mode)) | |
222 | { | |
223 | *owner = statbuf.st_uid; | |
224 | return 0; | |
225 | } | |
226 | else | |
227 | return -1; | |
228 | } | |
229 | ||
230 | static int | |
231 | get_number_of_cpu_cores (void) | |
232 | { | |
233 | int cores = 0; | |
234 | FILE *f = fopen ("/proc/cpuinfo", "r"); | |
235 | ||
236 | while (!feof (f)) | |
237 | { | |
238 | char buf[512]; | |
239 | char *p = fgets (buf, sizeof (buf), f); | |
240 | ||
241 | if (p && strncmp (buf, "processor", 9) == 0) | |
242 | ++cores; | |
243 | } | |
244 | ||
245 | fclose (f); | |
246 | ||
247 | return cores; | |
248 | } | |
249 | ||
250 | /* CORES points to an array of at least get_number_of_cpu_cores () elements. */ | |
251 | ||
252 | static int | |
253 | get_cores_used_by_process (pid_t pid, int *cores) | |
254 | { | |
255 | char taskdir[sizeof ("/proc/4294967295/task")]; | |
256 | DIR *dir; | |
257 | struct dirent *dp; | |
258 | int task_count = 0; | |
259 | ||
260 | sprintf (taskdir, "/proc/%d/task", pid); | |
261 | dir = opendir (taskdir); | |
e5798bef | 262 | if (dir) |
d26e3629 | 263 | { |
e5798bef PA |
264 | while ((dp = readdir (dir)) != NULL) |
265 | { | |
266 | pid_t tid; | |
267 | int core; | |
d26e3629 | 268 | |
e5798bef PA |
269 | if (!isdigit (dp->d_name[0]) |
270 | || NAMELEN (dp) > sizeof ("4294967295") - 1) | |
271 | continue; | |
d26e3629 | 272 | |
e5798bef PA |
273 | tid = atoi (dp->d_name); |
274 | core = linux_common_core_of_thread (ptid_build (pid, tid, 0)); | |
d26e3629 | 275 | |
e5798bef PA |
276 | if (core >= 0) |
277 | { | |
278 | ++cores[core]; | |
279 | ++task_count; | |
280 | } | |
d26e3629 | 281 | } |
d26e3629 | 282 | |
e5798bef PA |
283 | closedir (dir); |
284 | } | |
d26e3629 KY |
285 | |
286 | return task_count; | |
287 | } | |
288 | ||
289 | static LONGEST | |
290 | linux_xfer_osdata_processes (gdb_byte *readbuf, | |
291 | ULONGEST offset, LONGEST len) | |
292 | { | |
293 | /* We make the process list snapshot when the object starts to be read. */ | |
294 | static const char *buf; | |
295 | static LONGEST len_avail = -1; | |
296 | static struct buffer buffer; | |
297 | ||
298 | if (offset == 0) | |
299 | { | |
300 | DIR *dirp; | |
301 | ||
302 | if (len_avail != -1 && len_avail != 0) | |
303 | buffer_free (&buffer); | |
304 | len_avail = 0; | |
305 | buf = NULL; | |
306 | buffer_init (&buffer); | |
307 | buffer_grow_str (&buffer, "<osdata type=\"processes\">\n"); | |
308 | ||
309 | dirp = opendir ("/proc"); | |
310 | if (dirp) | |
311 | { | |
312 | const int num_cores = get_number_of_cpu_cores (); | |
313 | struct dirent *dp; | |
314 | ||
315 | while ((dp = readdir (dirp)) != NULL) | |
316 | { | |
317 | pid_t pid; | |
318 | uid_t owner; | |
319 | char user[UT_NAMESIZE]; | |
320 | char *command_line; | |
321 | int *cores; | |
322 | int task_count; | |
323 | char *cores_str; | |
324 | int i; | |
325 | ||
326 | if (!isdigit (dp->d_name[0]) | |
327 | || NAMELEN (dp) > sizeof ("4294967295") - 1) | |
328 | continue; | |
329 | ||
330 | sscanf (dp->d_name, "%d", &pid); | |
331 | command_line = commandline_from_pid (pid); | |
332 | ||
333 | if (get_process_owner (&owner, pid) == 0) | |
334 | user_from_uid (user, sizeof (user), owner); | |
335 | else | |
336 | strcpy (user, "?"); | |
337 | ||
338 | /* Find CPU cores used by the process. */ | |
339 | cores = (int *) xcalloc (num_cores, sizeof (int)); | |
340 | task_count = get_cores_used_by_process (pid, cores); | |
341 | cores_str = (char *) xcalloc (task_count, sizeof ("4294967295") + 1); | |
342 | ||
343 | for (i = 0; i < num_cores && task_count > 0; ++i) | |
344 | if (cores[i]) | |
345 | { | |
346 | char core_str[sizeof ("4294967205")]; | |
347 | ||
348 | sprintf (core_str, "%d", i); | |
349 | strcat (cores_str, core_str); | |
350 | ||
351 | task_count -= cores[i]; | |
352 | if (task_count > 0) | |
353 | strcat (cores_str, ","); | |
354 | } | |
355 | ||
356 | xfree (cores); | |
357 | ||
358 | buffer_xml_printf ( | |
359 | &buffer, | |
360 | "<item>" | |
361 | "<column name=\"pid\">%d</column>" | |
362 | "<column name=\"user\">%s</column>" | |
363 | "<column name=\"command\">%s</column>" | |
364 | "<column name=\"cores\">%s</column>" | |
365 | "</item>", | |
366 | pid, | |
367 | user, | |
368 | command_line ? command_line : "", | |
369 | cores_str); | |
370 | ||
371 | xfree (command_line); | |
372 | xfree (cores_str); | |
373 | } | |
374 | ||
375 | closedir (dirp); | |
376 | } | |
377 | ||
378 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
379 | buf = buffer_finish (&buffer); | |
380 | len_avail = strlen (buf); | |
381 | } | |
382 | ||
383 | if (offset >= len_avail) | |
384 | { | |
385 | /* Done. Get rid of the buffer. */ | |
386 | buffer_free (&buffer); | |
387 | buf = NULL; | |
388 | len_avail = 0; | |
389 | return 0; | |
390 | } | |
391 | ||
392 | if (len > len_avail - offset) | |
393 | len = len_avail - offset; | |
394 | memcpy (readbuf, buf + offset, len); | |
395 | ||
396 | return len; | |
397 | } | |
398 | ||
399 | static LONGEST | |
400 | linux_xfer_osdata_threads (gdb_byte *readbuf, | |
401 | ULONGEST offset, LONGEST len) | |
402 | { | |
403 | /* We make the process list snapshot when the object starts to be read. */ | |
404 | static const char *buf; | |
405 | static LONGEST len_avail = -1; | |
406 | static struct buffer buffer; | |
407 | ||
408 | if (offset == 0) | |
409 | { | |
410 | DIR *dirp; | |
411 | ||
412 | if (len_avail != -1 && len_avail != 0) | |
413 | buffer_free (&buffer); | |
414 | len_avail = 0; | |
415 | buf = NULL; | |
416 | buffer_init (&buffer); | |
417 | buffer_grow_str (&buffer, "<osdata type=\"threads\">\n"); | |
418 | ||
419 | dirp = opendir ("/proc"); | |
420 | if (dirp) | |
421 | { | |
422 | struct dirent *dp; | |
423 | ||
424 | while ((dp = readdir (dirp)) != NULL) | |
425 | { | |
426 | struct stat statbuf; | |
427 | char procentry[sizeof ("/proc/4294967295")]; | |
428 | ||
429 | if (!isdigit (dp->d_name[0]) | |
430 | || NAMELEN (dp) > sizeof ("4294967295") - 1) | |
431 | continue; | |
432 | ||
433 | sprintf (procentry, "/proc/%s", dp->d_name); | |
434 | if (stat (procentry, &statbuf) == 0 | |
435 | && S_ISDIR (statbuf.st_mode)) | |
436 | { | |
437 | DIR *dirp2; | |
438 | char *pathname; | |
439 | pid_t pid; | |
440 | char command[32]; | |
441 | ||
442 | pathname = xstrprintf ("/proc/%s/task", dp->d_name); | |
443 | ||
444 | pid = atoi (dp->d_name); | |
445 | command_from_pid (command, sizeof (command), pid); | |
446 | ||
447 | dirp2 = opendir (pathname); | |
448 | ||
449 | if (dirp2) | |
450 | { | |
451 | struct dirent *dp2; | |
452 | ||
453 | while ((dp2 = readdir (dirp2)) != NULL) | |
454 | { | |
455 | pid_t tid; | |
456 | int core; | |
457 | ||
458 | if (!isdigit (dp2->d_name[0]) | |
459 | || NAMELEN (dp2) > sizeof ("4294967295") - 1) | |
460 | continue; | |
461 | ||
462 | tid = atoi (dp2->d_name); | |
463 | core = linux_common_core_of_thread (ptid_build (pid, tid, 0)); | |
464 | ||
465 | buffer_xml_printf ( | |
466 | &buffer, | |
467 | "<item>" | |
468 | "<column name=\"pid\">%d</column>" | |
469 | "<column name=\"command\">%s</column>" | |
470 | "<column name=\"tid\">%d</column>" | |
471 | "<column name=\"core\">%d</column>" | |
472 | "</item>", | |
473 | pid, | |
474 | command, | |
475 | tid, | |
476 | core); | |
477 | } | |
478 | ||
479 | closedir (dirp2); | |
480 | } | |
481 | ||
482 | xfree (pathname); | |
483 | } | |
484 | } | |
485 | ||
486 | closedir (dirp); | |
487 | } | |
488 | ||
489 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
490 | buf = buffer_finish (&buffer); | |
491 | len_avail = strlen (buf); | |
492 | } | |
493 | ||
494 | if (offset >= len_avail) | |
495 | { | |
496 | /* Done. Get rid of the buffer. */ | |
497 | buffer_free (&buffer); | |
498 | buf = NULL; | |
499 | len_avail = 0; | |
500 | return 0; | |
501 | } | |
502 | ||
503 | if (len > len_avail - offset) | |
504 | len = len_avail - offset; | |
505 | memcpy (readbuf, buf + offset, len); | |
506 | ||
507 | return len; | |
508 | } | |
509 | ||
510 | struct osdata_type { | |
511 | char *type; | |
512 | char *description; | |
513 | LONGEST (*getter) (gdb_byte *readbuf, ULONGEST offset, LONGEST len); | |
514 | } osdata_table[] = { | |
515 | { "processes", "Listing of all processes", linux_xfer_osdata_processes }, | |
516 | { "threads", "Listing of all threads", linux_xfer_osdata_threads }, | |
517 | { NULL, NULL, NULL } | |
518 | }; | |
519 | ||
520 | LONGEST | |
521 | linux_common_xfer_osdata (const char *annex, gdb_byte *readbuf, | |
522 | ULONGEST offset, LONGEST len) | |
523 | { | |
524 | if (!annex || *annex == '\0') | |
525 | { | |
526 | static const char *buf; | |
527 | static LONGEST len_avail = -1; | |
528 | static struct buffer buffer; | |
529 | ||
530 | if (offset == 0) | |
531 | { | |
532 | int i; | |
533 | ||
534 | if (len_avail != -1 && len_avail != 0) | |
535 | buffer_free (&buffer); | |
536 | len_avail = 0; | |
537 | buf = NULL; | |
538 | buffer_init (&buffer); | |
539 | buffer_grow_str (&buffer, "<osdata type=\"types\">\n"); | |
540 | ||
541 | for (i = 0; osdata_table[i].type; ++i) | |
542 | buffer_xml_printf ( | |
543 | &buffer, | |
544 | "<item>" | |
545 | "<column name=\"Type\">%s</column>" | |
546 | "<column name=\"Description\">%s</column>" | |
547 | "</item>", | |
548 | osdata_table[i].type, | |
549 | osdata_table[i].description); | |
550 | ||
551 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
552 | buf = buffer_finish (&buffer); | |
553 | len_avail = strlen (buf); | |
554 | } | |
555 | ||
556 | if (offset >= len_avail) | |
557 | { | |
558 | /* Done. Get rid of the buffer. */ | |
559 | buffer_free (&buffer); | |
560 | buf = NULL; | |
561 | len_avail = 0; | |
562 | return 0; | |
563 | } | |
564 | ||
565 | if (len > len_avail - offset) | |
566 | len = len_avail - offset; | |
567 | memcpy (readbuf, buf + offset, len); | |
568 | ||
569 | return len; | |
570 | } | |
571 | else | |
572 | { | |
573 | int i; | |
574 | ||
575 | for (i = 0; osdata_table[i].type; ++i) | |
576 | { | |
577 | if (strcmp (annex, osdata_table[i].type) == 0) | |
578 | { | |
579 | gdb_assert (readbuf); | |
580 | ||
581 | return (osdata_table[i].getter) (readbuf, offset, len); | |
582 | } | |
583 | } | |
584 | ||
585 | return 0; | |
586 | } | |
587 | } | |
588 |