1 /* vi: set sw=4 ts=4: */
2 /*
3 * Utility routines.
4 *
5 * Copyright 1998 by Albert Cahalan; all rights reserved.
6 * Copyright (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
7 * SELinux support: (c) 2007 by Yuichi Nakamura <ynakam@hitachisoft.jp>
8 *
9 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 */
11 #include "libbb.h"
12
13
14 typedef struct id_to_name_map_t {
15 uid_t id;
16 char name[USERNAME_MAX_SIZE];
17 } id_to_name_map_t;
18
19 typedef struct cache_t {
20 id_to_name_map_t *cache;
21 int size;
22 } cache_t;
23
24 static cache_t *cache_user_group;
25
clear_username_cache(void)26 void FAST_FUNC clear_username_cache(void)
27 {
28 if (cache_user_group) {
29 free(cache_user_group[0].cache);
30 free(cache_user_group[1].cache);
31 free(cache_user_group);
32 cache_user_group = NULL;
33 }
34 }
35
get_cached(int user_group,uid_t id,char * FAST_FUNC x2x_utoa (uid_t id))36 static char* get_cached(int user_group, uid_t id,
37 char* FAST_FUNC x2x_utoa(uid_t id))
38 {
39 cache_t *cp;
40 int i;
41
42 if (!cache_user_group)
43 cache_user_group = xzalloc(sizeof(cache_user_group[0]) * 2);
44
45 cp = &cache_user_group[user_group];
46
47 for (i = 0; i < cp->size; i++)
48 if (cp->cache[i].id == id)
49 return cp->cache[i].name;
50 i = cp->size++;
51 cp->cache = xrealloc_vector(cp->cache, 2, i);
52 cp->cache[i].id = id;
53 /* Never fails. Generates numeric string if name isn't found */
54 safe_strncpy(cp->cache[i].name, x2x_utoa(id), sizeof(cp->cache[i].name));
55 return cp->cache[i].name;
56 }
get_cached_username(uid_t uid)57 const char* FAST_FUNC get_cached_username(uid_t uid)
58 {
59 return get_cached(0, uid, uid2uname_utoa);
60 }
get_cached_groupname(gid_t gid)61 const char* FAST_FUNC get_cached_groupname(gid_t gid)
62 {
63 return get_cached(1, gid, gid2group_utoa);
64 }
65
66
67 #define PROCPS_BUFSIZE 1024
68
read_to_buf(const char * filename,void * buf)69 static int read_to_buf(const char *filename, void *buf)
70 {
71 int fd;
72 /* open_read_close() would do two reads, checking for EOF.
73 * When you have 10000 /proc/$NUM/stat to read, it isn't desirable */
74 ssize_t ret = -1;
75 fd = open(filename, O_RDONLY);
76 if (fd >= 0) {
77 ret = read(fd, buf, PROCPS_BUFSIZE-1);
78 close(fd);
79 }
80 ((char *)buf)[ret > 0 ? ret : 0] = '\0';
81 return ret;
82 }
83
alloc_procps_scan(void)84 static procps_status_t* FAST_FUNC alloc_procps_scan(void)
85 {
86 procps_status_t* sp = xzalloc(sizeof(procps_status_t));
87 unsigned n = bb_getpagesize();
88 while (1) {
89 n >>= 1;
90 if (!n) break;
91 sp->shift_pages_to_bytes++;
92 }
93 sp->shift_pages_to_kb = sp->shift_pages_to_bytes - 10;
94 sp->dir = xopendir("/proc");
95 return sp;
96 }
97
free_procps_scan(procps_status_t * sp)98 void FAST_FUNC free_procps_scan(procps_status_t* sp)
99 {
100 closedir(sp->dir);
101 #if ENABLE_FEATURE_SHOW_THREADS
102 if (sp->task_dir)
103 closedir(sp->task_dir);
104 #endif
105 free(sp->argv0);
106 free(sp->exe);
107 IF_SELINUX(free(sp->context);)
108 free(sp);
109 }
110
111 #if ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
fast_strtoull_16(char ** endptr)112 static unsigned long long fast_strtoull_16(char **endptr)
113 {
114 unsigned char c;
115 char *str = *endptr;
116 unsigned long long n = 0;
117
118 /* Need to stop on both ' ' and '\n' */
119 while ((c = *str++) > ' ') {
120 c = ((c|0x20) - '0');
121 if (c > 9)
122 /* c = c + '0' - 'a' + 10: */
123 c = c - ('a' - '0' - 10);
124 n = n*16 + c;
125 }
126 *endptr = str; /* We skip trailing space! */
127 return n;
128 }
129 #endif
130
131 #if ENABLE_FEATURE_FAST_TOP || ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
132 /* We cut a lot of corners here for speed */
fast_strtoul_10(char ** endptr)133 static unsigned long fast_strtoul_10(char **endptr)
134 {
135 unsigned char c;
136 char *str = *endptr;
137 unsigned long n = *str - '0';
138
139 /* Need to stop on both ' ' and '\n' */
140 while ((c = *++str) > ' ')
141 n = n*10 + (c - '0');
142
143 *endptr = str + 1; /* We skip trailing space! */
144 return n;
145 }
146
147 # if ENABLE_FEATURE_FAST_TOP
fast_strtol_10(char ** endptr)148 static long fast_strtol_10(char **endptr)
149 {
150 if (**endptr != '-')
151 return fast_strtoul_10(endptr);
152
153 (*endptr)++;
154 return - (long)fast_strtoul_10(endptr);
155 }
156 # endif
157
skip_fields(char * str,int count)158 static char *skip_fields(char *str, int count)
159 {
160 do {
161 while (*str++ != ' ')
162 continue;
163 /* we found a space char, str points after it */
164 } while (--count);
165 return str;
166 }
167 #endif
168
169 #if ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
skip_whitespace_if_prefixed_with(char * buf,const char * prefix)170 static char* skip_whitespace_if_prefixed_with(char *buf, const char *prefix)
171 {
172 char *tp = is_prefixed_with(buf, prefix);
173 if (tp) {
174 tp = skip_whitespace(tp);
175 }
176 return tp;
177 }
178
procps_read_smaps(pid_t pid,struct smaprec * total,void (* cb)(struct smaprec *,void *),void * data)179 int FAST_FUNC procps_read_smaps(pid_t pid, struct smaprec *total,
180 void (*cb)(struct smaprec *, void *), void *data)
181 {
182 FILE *file;
183 struct smaprec currec;
184 char filename[sizeof("/proc/%u/smaps") + sizeof(int)*3];
185 char buf[PROCPS_BUFSIZE];
186 #if !ENABLE_PMAP
187 void (*cb)(struct smaprec *, void *) = NULL;
188 void *data = NULL;
189 #endif
190
191 sprintf(filename, "/proc/%u/smaps", (int)pid);
192
193 file = fopen_for_read(filename);
194 if (!file)
195 return 1;
196
197 memset(&currec, 0, sizeof(currec));
198 while (fgets(buf, PROCPS_BUFSIZE, file)) {
199 // Each mapping datum has this form:
200 // f7d29000-f7d39000 rw-s FILEOFS M:m INODE FILENAME
201 // Size: nnn kB
202 // Rss: nnn kB
203 // .....
204
205 char *tp, *p;
206
207 #define SCAN(S, X) \
208 if ((tp = skip_whitespace_if_prefixed_with(buf, S)) != NULL) { \
209 total->X += currec.X = fast_strtoul_10(&tp); \
210 continue; \
211 }
212 if (cb) {
213 SCAN("Pss:" , smap_pss );
214 SCAN("Swap:" , smap_swap );
215 }
216 SCAN("Private_Dirty:", private_dirty);
217 SCAN("Private_Clean:", private_clean);
218 SCAN("Shared_Dirty:" , shared_dirty );
219 SCAN("Shared_Clean:" , shared_clean );
220 #undef SCAN
221 tp = strchr(buf, '-');
222 if (tp) {
223 // We reached next mapping - the line of this form:
224 // f7d29000-f7d39000 rw-s FILEOFS M:m INODE FILENAME
225
226 if (cb) {
227 /* If we have a previous record, there's nothing more
228 * for it, call the callback and clear currec
229 */
230 if (currec.smap_size)
231 cb(&currec, data);
232 free(currec.smap_name);
233 }
234 memset(&currec, 0, sizeof(currec));
235
236 *tp = ' ';
237 tp = buf;
238 currec.smap_start = fast_strtoull_16(&tp);
239 currec.smap_size = (fast_strtoull_16(&tp) - currec.smap_start) >> 10;
240
241 strncpy(currec.smap_mode, tp, sizeof(currec.smap_mode)-1);
242
243 // skipping "rw-s FILEOFS M:m INODE "
244 tp = skip_whitespace(skip_fields(tp, 4));
245 // filter out /dev/something (something != zero)
246 if (!is_prefixed_with(tp, "/dev/") || strcmp(tp, "/dev/zero\n") == 0) {
247 if (currec.smap_mode[1] == 'w') {
248 currec.mapped_rw = currec.smap_size;
249 total->mapped_rw += currec.smap_size;
250 } else if (currec.smap_mode[1] == '-') {
251 currec.mapped_ro = currec.smap_size;
252 total->mapped_ro += currec.smap_size;
253 }
254 }
255
256 if (strcmp(tp, "[stack]\n") == 0)
257 total->stack += currec.smap_size;
258 if (cb) {
259 p = skip_non_whitespace(tp);
260 if (p == tp) {
261 currec.smap_name = xstrdup(" [ anon ]");
262 } else {
263 *p = '\0';
264 currec.smap_name = xstrdup(tp);
265 }
266 }
267 total->smap_size += currec.smap_size;
268 }
269 }
270 fclose(file);
271
272 if (cb) {
273 if (currec.smap_size)
274 cb(&currec, data);
275 free(currec.smap_name);
276 }
277
278 return 0;
279 }
280 #endif
281
procps_scan(procps_status_t * sp,int flags)282 procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
283 {
284 if (!sp)
285 sp = alloc_procps_scan();
286
287 for (;;) {
288 struct dirent *entry;
289 char buf[PROCPS_BUFSIZE];
290 long tasknice;
291 unsigned pid;
292 int n;
293 char filename[sizeof("/proc/%u/task/%u/cmdline") + sizeof(int)*3 * 2];
294 char *filename_tail;
295
296 #if ENABLE_FEATURE_SHOW_THREADS
297 if (sp->task_dir) {
298 entry = readdir(sp->task_dir);
299 if (entry)
300 goto got_entry;
301 closedir(sp->task_dir);
302 sp->task_dir = NULL;
303 }
304 #endif
305 entry = readdir(sp->dir);
306 if (entry == NULL) {
307 free_procps_scan(sp);
308 return NULL;
309 }
310 IF_FEATURE_SHOW_THREADS(got_entry:)
311 pid = bb_strtou(entry->d_name, NULL, 10);
312 if (errno)
313 continue;
314 #if ENABLE_FEATURE_SHOW_THREADS
315 if ((flags & PSSCAN_TASKS) && !sp->task_dir) {
316 /* We found another /proc/PID. Do not use it,
317 * there will be /proc/PID/task/PID (same PID!),
318 * so just go ahead and dive into /proc/PID/task. */
319 sprintf(filename, "/proc/%u/task", pid);
320 /* Note: if opendir fails, we just go to next /proc/XXX */
321 sp->task_dir = opendir(filename);
322 sp->main_thread_pid = pid;
323 continue;
324 }
325 #endif
326
327 /* After this point we can:
328 * "break": stop parsing, return the data
329 * "continue": try next /proc/XXX
330 */
331
332 memset(&sp->vsz, 0, sizeof(*sp) - offsetof(procps_status_t, vsz));
333
334 sp->pid = pid;
335 if (!(flags & ~PSSCAN_PID))
336 break; /* we needed only pid, we got it */
337
338 #if ENABLE_SELINUX
339 if (flags & PSSCAN_CONTEXT) {
340 if (getpidcon(sp->pid, &sp->context) < 0)
341 sp->context = NULL;
342 }
343 #endif
344
345 #if ENABLE_FEATURE_SHOW_THREADS
346 if (sp->task_dir)
347 filename_tail = filename + sprintf(filename, "/proc/%u/task/%u/", sp->main_thread_pid, pid);
348 else
349 #endif
350 filename_tail = filename + sprintf(filename, "/proc/%u/", pid);
351
352 if (flags & PSSCAN_UIDGID) {
353 struct stat sb;
354 if (stat(filename, &sb))
355 continue; /* process probably exited */
356 /* Effective UID/GID, not real */
357 sp->uid = sb.st_uid;
358 sp->gid = sb.st_gid;
359 }
360
361 /* These are all retrieved from proc/NN/stat in one go: */
362 if (flags & (PSSCAN_PPID | PSSCAN_PGID | PSSCAN_SID
363 | PSSCAN_COMM | PSSCAN_STATE
364 | PSSCAN_VSZ | PSSCAN_RSS
365 | PSSCAN_STIME | PSSCAN_UTIME | PSSCAN_START_TIME
366 | PSSCAN_TTY | PSSCAN_NICE
367 | PSSCAN_CPU)
368 ) {
369 int s_idx;
370 char *cp, *comm1;
371 int tty;
372 #if !ENABLE_FEATURE_FAST_TOP
373 unsigned long vsz, rss;
374 #endif
375 /* see proc(5) for some details on this */
376 strcpy(filename_tail, "stat");
377 n = read_to_buf(filename, buf);
378 if (n < 0)
379 continue; /* process probably exited */
380 cp = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
381 /*if (!cp || cp[1] != ' ')
382 continue;*/
383 cp[0] = '\0';
384 BUILD_BUG_ON(sizeof(sp->comm) < 16);
385 comm1 = strchr(buf, '(');
386 /*if (comm1)*/
387 safe_strncpy(sp->comm, comm1 + 1, sizeof(sp->comm));
388
389 #if !ENABLE_FEATURE_FAST_TOP
390 n = sscanf(cp+2,
391 "%c %u " /* state, ppid */
392 "%u %u %d %*s " /* pgid, sid, tty, tpgid */
393 "%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
394 "%lu %lu " /* utime, stime */
395 "%*s %*s %*s " /* cutime, cstime, priority */
396 "%ld " /* nice */
397 "%*s %*s " /* timeout, it_real_value */
398 "%lu " /* start_time */
399 "%lu " /* vsize */
400 "%lu " /* rss */
401 # if ENABLE_FEATURE_TOP_SMP_PROCESS
402 "%*s %*s %*s %*s %*s %*s " /*rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
403 "%*s %*s %*s %*s " /*signal, blocked, sigignore, sigcatch */
404 "%*s %*s %*s %*s " /*wchan, nswap, cnswap, exit_signal */
405 "%d" /*cpu last seen on*/
406 # endif
407 ,
408 sp->state, &sp->ppid,
409 &sp->pgid, &sp->sid, &tty,
410 &sp->utime, &sp->stime,
411 &tasknice,
412 &sp->start_time,
413 &vsz,
414 &rss
415 # if ENABLE_FEATURE_TOP_SMP_PROCESS
416 , &sp->last_seen_on_cpu
417 # endif
418 );
419
420 if (n < 11)
421 continue; /* bogus data, get next /proc/XXX */
422 # if ENABLE_FEATURE_TOP_SMP_PROCESS
423 if (n == 11)
424 sp->last_seen_on_cpu = 0;
425 # endif
426
427 /* vsz is in bytes and we want kb */
428 sp->vsz = vsz >> 10;
429 /* vsz is in bytes but rss is in *PAGES*! Can you believe that? */
430 sp->rss = rss << sp->shift_pages_to_kb;
431 sp->tty_major = (tty >> 8) & 0xfff;
432 sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00);
433 #else
434 /* This costs ~100 bytes more but makes top faster by 20%
435 * If you run 10000 processes, this may be important for you */
436 sp->state[0] = cp[2];
437 cp += 4;
438 sp->ppid = fast_strtoul_10(&cp);
439 sp->pgid = fast_strtoul_10(&cp);
440 sp->sid = fast_strtoul_10(&cp);
441 tty = fast_strtoul_10(&cp);
442 sp->tty_major = (tty >> 8) & 0xfff;
443 sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00);
444 cp = skip_fields(cp, 6); /* tpgid, flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
445 sp->utime = fast_strtoul_10(&cp);
446 sp->stime = fast_strtoul_10(&cp);
447 cp = skip_fields(cp, 3); /* cutime, cstime, priority */
448 tasknice = fast_strtol_10(&cp);
449 cp = skip_fields(cp, 2); /* timeout, it_real_value */
450 sp->start_time = fast_strtoul_10(&cp);
451 /* vsz is in bytes and we want kb */
452 sp->vsz = fast_strtoul_10(&cp) >> 10;
453 /* vsz is in bytes but rss is in *PAGES*! Can you believe that? */
454 sp->rss = fast_strtoul_10(&cp) << sp->shift_pages_to_kb;
455 # if ENABLE_FEATURE_TOP_SMP_PROCESS
456 /* (6): rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
457 /* (4): signal, blocked, sigignore, sigcatch */
458 /* (4): wchan, nswap, cnswap, exit_signal */
459 cp = skip_fields(cp, 14);
460 //FIXME: is it safe to assume this field exists?
461 sp->last_seen_on_cpu = fast_strtoul_10(&cp);
462 # endif
463 #endif /* FEATURE_FAST_TOP */
464
465 #if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
466 sp->niceness = tasknice;
467 #endif
468 sp->state[1] = ' ';
469 sp->state[2] = ' ';
470 s_idx = 1;
471 if (sp->vsz == 0 && sp->state[0] != 'Z') {
472 /* not sure what the purpose of this flag */
473 sp->state[1] = 'W';
474 s_idx = 2;
475 }
476 if (tasknice != 0) {
477 if (tasknice < 0)
478 sp->state[s_idx] = '<';
479 else /* > 0 */
480 sp->state[s_idx] = 'N';
481 }
482 }
483
484 #if ENABLE_FEATURE_TOPMEM
485 if (flags & PSSCAN_SMAPS)
486 procps_read_smaps(pid, &sp->smaps, NULL, NULL);
487 #endif /* TOPMEM */
488 #if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
489 if (flags & PSSCAN_RUIDGID) {
490 FILE *file;
491
492 strcpy(filename_tail, "status");
493 file = fopen_for_read(filename);
494 if (file) {
495 while (fgets(buf, sizeof(buf), file)) {
496 char *tp;
497 #define SCAN_TWO(str, name, statement) \
498 if ((tp = is_prefixed_with(buf, str)) != NULL) { \
499 tp = skip_whitespace(tp); \
500 sscanf(tp, "%u", &sp->name); \
501 statement; \
502 }
503 SCAN_TWO("Uid:", ruid, continue);
504 SCAN_TWO("Gid:", rgid, break);
505 #undef SCAN_TWO
506 }
507 fclose(file);
508 }
509 }
510 #endif /* PS_ADDITIONAL_COLUMNS */
511 if (flags & PSSCAN_EXE) {
512 strcpy(filename_tail, "exe");
513 free(sp->exe);
514 sp->exe = xmalloc_readlink(filename);
515 }
516 /* Note: if /proc/PID/cmdline is empty,
517 * code below "breaks". Therefore it must be
518 * the last code to parse /proc/PID/xxx data
519 * (we used to have /proc/PID/exe parsing after it
520 * and were getting stale sp->exe).
521 */
522 #if 0 /* PSSCAN_CMD is not used */
523 if (flags & (PSSCAN_CMD|PSSCAN_ARGV0)) {
524 free(sp->argv0);
525 sp->argv0 = NULL;
526 free(sp->cmd);
527 sp->cmd = NULL;
528 strcpy(filename_tail, "cmdline");
529 /* TODO: to get rid of size limits, read into malloc buf,
530 * then realloc it down to real size. */
531 n = read_to_buf(filename, buf);
532 if (n <= 0)
533 break;
534 if (flags & PSSCAN_ARGV0)
535 sp->argv0 = xstrdup(buf);
536 if (flags & PSSCAN_CMD) {
537 do {
538 n--;
539 if ((unsigned char)(buf[n]) < ' ')
540 buf[n] = ' ';
541 } while (n);
542 sp->cmd = xstrdup(buf);
543 }
544 }
545 #else
546 if (flags & (PSSCAN_ARGV0|PSSCAN_ARGVN)) {
547 free(sp->argv0);
548 sp->argv0 = NULL;
549 strcpy(filename_tail, "cmdline");
550 n = read_to_buf(filename, buf);
551 if (n <= 0)
552 break;
553 if (flags & PSSCAN_ARGVN) {
554 sp->argv_len = n;
555 sp->argv0 = xmemdup(buf, n + 1);
556 /* sp->argv0[n] = '\0'; - buf has it */
557 } else {
558 sp->argv_len = 0;
559 sp->argv0 = xstrdup(buf);
560 }
561 }
562 #endif
563 break;
564 } /* for (;;) */
565
566 return sp;
567 }
568
read_cmdline(char * buf,int col,unsigned pid,const char * comm)569 void FAST_FUNC read_cmdline(char *buf, int col, unsigned pid, const char *comm)
570 {
571 int sz;
572 char filename[sizeof("/proc/%u/cmdline") + sizeof(int)*3];
573
574 sprintf(filename, "/proc/%u/cmdline", pid);
575 sz = open_read_close(filename, buf, col - 1);
576 if (sz > 0) {
577 const char *base;
578 int comm_len;
579
580 buf[sz] = '\0';
581 while (--sz >= 0 && buf[sz] == '\0')
582 continue;
583 /* Prevent basename("process foo/bar") = "bar" */
584 strchrnul(buf, ' ')[0] = '\0';
585 base = bb_basename(buf); /* before we replace argv0's NUL with space */
586 while (sz >= 0) {
587 if ((unsigned char)(buf[sz]) < ' ')
588 buf[sz] = ' ';
589 sz--;
590 }
591 if (base[0] == '-') /* "-sh" (login shell)? */
592 base++;
593
594 /* If comm differs from argv0, prepend "{comm} ".
595 * It allows to see thread names set by prctl(PR_SET_NAME).
596 */
597 if (!comm)
598 return;
599 comm_len = strlen(comm);
600 /* Why compare up to comm_len, not COMM_LEN-1?
601 * Well, some processes rewrite argv, and use _spaces_ there
602 * while rewriting. (KDE is observed to do it).
603 * I prefer to still treat argv0 "process foo bar"
604 * as 'equal' to comm "process".
605 */
606 if (strncmp(base, comm, comm_len) != 0) {
607 comm_len += 3;
608 if (col > comm_len)
609 memmove(buf + comm_len, buf, col - comm_len);
610 snprintf(buf, col, "{%s}", comm);
611 if (col <= comm_len)
612 return;
613 buf[comm_len - 1] = ' ';
614 buf[col - 1] = '\0';
615 }
616 } else {
617 snprintf(buf, col, "[%s]", comm ? comm : "?");
618 }
619 }
620
621 /* from kernel:
622 // pid comm S ppid pgid sid tty_nr tty_pgrp flg
623 sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
624 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
625 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu %llu\n",
626 task->pid,
627 tcomm,
628 state,
629 ppid,
630 pgid,
631 sid,
632 tty_nr,
633 tty_pgrp,
634 task->flags,
635 min_flt,
636 cmin_flt,
637 maj_flt,
638 cmaj_flt,
639 cputime_to_clock_t(utime),
640 cputime_to_clock_t(stime),
641 cputime_to_clock_t(cutime),
642 cputime_to_clock_t(cstime),
643 priority,
644 nice,
645 num_threads,
646 // 0,
647 start_time,
648 vsize,
649 mm ? get_mm_rss(mm) : 0,
650 rsslim,
651 mm ? mm->start_code : 0,
652 mm ? mm->end_code : 0,
653 mm ? mm->start_stack : 0,
654 esp,
655 eip,
656 the rest is some obsolete cruft
657 */
658