1 /* 2 * linux/fs/proc/array.c 3 * 4 * Copyright (C) 1992 by Linus Torvalds 5 * based on ideas by Darren Senn 6 * 7 * Fixes: 8 * Michael. K. Johnson: stat,statm extensions. 9 * <[email protected]> 10 * 11 * Pauline Middelink : Made cmdline,envline only break at '\0's, to 12 * make sure SET_PROCTITLE works. Also removed 13 * bad '!' which forced address recalculation for 14 * EVERY character on the current page. 15 * <[email protected]> 16 * 17 * Danny ter Haar : added cpuinfo 18 * <[email protected]> 19 * 20 * Alessandro Rubini : profile extension. 21 * <[email protected]> 22 * 23 * Jeff Tranter : added BogoMips field to cpuinfo 24 * <[email protected]> 25 * 26 * Bruno Haible : remove 4K limit for the maps file 27 * <[email protected]> 28 * 29 * Yves Arrouye : remove removal of trailing spaces in get_array. 30 * <[email protected]> 31 * 32 * Jerome Forissier : added per-CPU time information to /proc/stat 33 * and /proc/<pid>/cpu extension 34 * <[email protected]> 35 * - Incorporation and non-SMP safe operation 36 * of forissier patch in 2.1.78 by 37 * Hans Marcus <[email protected]> 38 * 39 * [email protected] : /proc/partitions 40 * 41 * 42 * Alan Cox : security fixes. 43 * <[email protected]> 44 * 45 * Al Viro : safe handling of mm_struct 46 * 47 * Gerhard Wichert : added BIGMEM support 48 * Siemens AG <[email protected]> 49 * 50 * Al Viro & Jeff Garzik : moved most of the thing into base.c and 51 * : proc_misc.c. The rest may eventually go into 52 * : base.c too. 53 */ 54 55 #include <linux/types.h> 56 #include <linux/errno.h> 57 #include <linux/time.h> 58 #include <linux/kernel.h> 59 #include <linux/kernel_stat.h> 60 #include <linux/tty.h> 61 #include <linux/string.h> 62 #include <linux/mman.h> 63 #include <linux/proc_fs.h> 64 #include <linux/ioport.h> 65 #include <linux/uaccess.h> 66 #include <linux/io.h> 67 #include <linux/mm.h> 68 #include <linux/hugetlb.h> 69 #include <linux/pagemap.h> 70 #include <linux/swap.h> 71 #include <linux/slab.h> 72 #include <linux/smp.h> 73 #include <linux/signal.h> 74 #include <linux/highmem.h> 75 #include <linux/file.h> 76 #include <linux/times.h> 77 #include <linux/cpuset.h> 78 #include <linux/rcupdate.h> 79 #include <linux/delayacct.h> 80 #include <linux/pid_namespace.h> 81 82 #include <asm/pgtable.h> 83 #include <asm/processor.h> 84 #include "internal.h" 85 86 /* Gcc optimizes away "strlen(x)" for constant x */ 87 #define ADDBUF(buffer, string) \ 88 do { memcpy(buffer, string, strlen(string)); \ 89 buffer += strlen(string); } while (0) 90 91 static inline char *task_name(struct task_struct *p, char *buf) 92 { 93 int i; 94 char *name; 95 char tcomm[sizeof(p->comm)]; 96 97 get_task_comm(tcomm, p); 98 99 ADDBUF(buf, "Name:\t"); 100 name = tcomm; 101 i = sizeof(tcomm); 102 do { 103 unsigned char c = *name; 104 name++; 105 i--; 106 *buf = c; 107 if (!c) 108 break; 109 if (c == '\\') { 110 buf[1] = c; 111 buf += 2; 112 continue; 113 } 114 if (c == '\n') { 115 buf[0] = '\\'; 116 buf[1] = 'n'; 117 buf += 2; 118 continue; 119 } 120 buf++; 121 } while (i); 122 *buf = '\n'; 123 return buf+1; 124 } 125 126 /* 127 * The task state array is a strange "bitmap" of 128 * reasons to sleep. Thus "running" is zero, and 129 * you can test for combinations of others with 130 * simple bit tests. 131 */ 132 static const char *task_state_array[] = { 133 "R (running)", /* 0 */ 134 "S (sleeping)", /* 1 */ 135 "D (disk sleep)", /* 2 */ 136 "T (stopped)", /* 4 */ 137 "T (tracing stop)", /* 8 */ 138 "Z (zombie)", /* 16 */ 139 "X (dead)" /* 32 */ 140 }; 141 142 static inline const char *get_task_state(struct task_struct *tsk) 143 { 144 unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state; 145 const char **p = &task_state_array[0]; 146 147 while (state) { 148 p++; 149 state >>= 1; 150 } 151 return *p; 152 } 153 154 static inline char *task_state(struct task_struct *p, char *buffer) 155 { 156 struct group_info *group_info; 157 int g; 158 struct fdtable *fdt = NULL; 159 struct pid_namespace *ns; 160 pid_t ppid, tpid; 161 162 ns = current->nsproxy->pid_ns; 163 rcu_read_lock(); 164 ppid = pid_alive(p) ? 165 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0; 166 tpid = pid_alive(p) && p->ptrace ? 167 task_pid_nr_ns(rcu_dereference(p->parent), ns) : 0; 168 buffer += sprintf(buffer, 169 "State:\t%s\n" 170 "Tgid:\t%d\n" 171 "Pid:\t%d\n" 172 "PPid:\t%d\n" 173 "TracerPid:\t%d\n" 174 "Uid:\t%d\t%d\t%d\t%d\n" 175 "Gid:\t%d\t%d\t%d\t%d\n", 176 get_task_state(p), 177 task_tgid_nr_ns(p, ns), 178 task_pid_nr_ns(p, ns), 179 ppid, tpid, 180 p->uid, p->euid, p->suid, p->fsuid, 181 p->gid, p->egid, p->sgid, p->fsgid); 182 183 task_lock(p); 184 if (p->files) 185 fdt = files_fdtable(p->files); 186 buffer += sprintf(buffer, 187 "FDSize:\t%d\n" 188 "Groups:\t", 189 fdt ? fdt->max_fds : 0); 190 rcu_read_unlock(); 191 192 group_info = p->group_info; 193 get_group_info(group_info); 194 task_unlock(p); 195 196 for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++) 197 buffer += sprintf(buffer, "%d ", GROUP_AT(group_info, g)); 198 put_group_info(group_info); 199 200 buffer += sprintf(buffer, "\n"); 201 return buffer; 202 } 203 204 static char *render_sigset_t(const char *header, sigset_t *set, char *buffer) 205 { 206 int i, len; 207 208 len = strlen(header); 209 memcpy(buffer, header, len); 210 buffer += len; 211 212 i = _NSIG; 213 do { 214 int x = 0; 215 216 i -= 4; 217 if (sigismember(set, i+1)) x |= 1; 218 if (sigismember(set, i+2)) x |= 2; 219 if (sigismember(set, i+3)) x |= 4; 220 if (sigismember(set, i+4)) x |= 8; 221 *buffer++ = (x < 10 ? '0' : 'a' - 10) + x; 222 } while (i >= 4); 223 224 *buffer++ = '\n'; 225 *buffer = 0; 226 return buffer; 227 } 228 229 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign, 230 sigset_t *catch) 231 { 232 struct k_sigaction *k; 233 int i; 234 235 k = p->sighand->action; 236 for (i = 1; i <= _NSIG; ++i, ++k) { 237 if (k->sa.sa_handler == SIG_IGN) 238 sigaddset(ign, i); 239 else if (k->sa.sa_handler != SIG_DFL) 240 sigaddset(catch, i); 241 } 242 } 243 244 static inline char *task_sig(struct task_struct *p, char *buffer) 245 { 246 unsigned long flags; 247 sigset_t pending, shpending, blocked, ignored, caught; 248 int num_threads = 0; 249 unsigned long qsize = 0; 250 unsigned long qlim = 0; 251 252 sigemptyset(&pending); 253 sigemptyset(&shpending); 254 sigemptyset(&blocked); 255 sigemptyset(&ignored); 256 sigemptyset(&caught); 257 258 rcu_read_lock(); 259 if (lock_task_sighand(p, &flags)) { 260 pending = p->pending.signal; 261 shpending = p->signal->shared_pending.signal; 262 blocked = p->blocked; 263 collect_sigign_sigcatch(p, &ignored, &caught); 264 num_threads = atomic_read(&p->signal->count); 265 qsize = atomic_read(&p->user->sigpending); 266 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur; 267 unlock_task_sighand(p, &flags); 268 } 269 rcu_read_unlock(); 270 271 buffer += sprintf(buffer, "Threads:\t%d\n", num_threads); 272 buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim); 273 274 /* render them all */ 275 buffer = render_sigset_t("SigPnd:\t", &pending, buffer); 276 buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer); 277 buffer = render_sigset_t("SigBlk:\t", &blocked, buffer); 278 buffer = render_sigset_t("SigIgn:\t", &ignored, buffer); 279 buffer = render_sigset_t("SigCgt:\t", &caught, buffer); 280 281 return buffer; 282 } 283 284 static char *render_cap_t(const char *header, kernel_cap_t *a, char *buffer) 285 { 286 unsigned __capi; 287 288 buffer += sprintf(buffer, "%s", header); 289 CAP_FOR_EACH_U32(__capi) { 290 buffer += sprintf(buffer, "%08x", 291 a->cap[(_LINUX_CAPABILITY_U32S-1) - __capi]); 292 } 293 return buffer + sprintf(buffer, "\n"); 294 } 295 296 static inline char *task_cap(struct task_struct *p, char *buffer) 297 { 298 buffer = render_cap_t("CapInh:\t", &p->cap_inheritable, buffer); 299 buffer = render_cap_t("CapPrm:\t", &p->cap_permitted, buffer); 300 return render_cap_t("CapEff:\t", &p->cap_effective, buffer); 301 } 302 303 static inline char *task_context_switch_counts(struct task_struct *p, 304 char *buffer) 305 { 306 return buffer + sprintf(buffer, "voluntary_ctxt_switches:\t%lu\n" 307 "nonvoluntary_ctxt_switches:\t%lu\n", 308 p->nvcsw, 309 p->nivcsw); 310 } 311 312 int proc_pid_status(struct task_struct *task, char *buffer) 313 { 314 char *orig = buffer; 315 struct mm_struct *mm = get_task_mm(task); 316 317 buffer = task_name(task, buffer); 318 buffer = task_state(task, buffer); 319 320 if (mm) { 321 buffer = task_mem(mm, buffer); 322 mmput(mm); 323 } 324 buffer = task_sig(task, buffer); 325 buffer = task_cap(task, buffer); 326 buffer = cpuset_task_status_allowed(task, buffer); 327 #if defined(CONFIG_S390) 328 buffer = task_show_regs(task, buffer); 329 #endif 330 buffer = task_context_switch_counts(task, buffer); 331 return buffer - orig; 332 } 333 334 /* 335 * Use precise platform statistics if available: 336 */ 337 #ifdef CONFIG_VIRT_CPU_ACCOUNTING 338 static cputime_t task_utime(struct task_struct *p) 339 { 340 return p->utime; 341 } 342 343 static cputime_t task_stime(struct task_struct *p) 344 { 345 return p->stime; 346 } 347 #else 348 static cputime_t task_utime(struct task_struct *p) 349 { 350 clock_t utime = cputime_to_clock_t(p->utime), 351 total = utime + cputime_to_clock_t(p->stime); 352 u64 temp; 353 354 /* 355 * Use CFS's precise accounting: 356 */ 357 temp = (u64)nsec_to_clock_t(p->se.sum_exec_runtime); 358 359 if (total) { 360 temp *= utime; 361 do_div(temp, total); 362 } 363 utime = (clock_t)temp; 364 365 p->prev_utime = max(p->prev_utime, clock_t_to_cputime(utime)); 366 return p->prev_utime; 367 } 368 369 static cputime_t task_stime(struct task_struct *p) 370 { 371 clock_t stime; 372 373 /* 374 * Use CFS's precise accounting. (we subtract utime from 375 * the total, to make sure the total observed by userspace 376 * grows monotonically - apps rely on that): 377 */ 378 stime = nsec_to_clock_t(p->se.sum_exec_runtime) - 379 cputime_to_clock_t(task_utime(p)); 380 381 if (stime >= 0) 382 p->prev_stime = max(p->prev_stime, clock_t_to_cputime(stime)); 383 384 return p->prev_stime; 385 } 386 #endif 387 388 static cputime_t task_gtime(struct task_struct *p) 389 { 390 return p->gtime; 391 } 392 393 static int do_task_stat(struct task_struct *task, char *buffer, int whole) 394 { 395 unsigned long vsize, eip, esp, wchan = ~0UL; 396 long priority, nice; 397 int tty_pgrp = -1, tty_nr = 0; 398 sigset_t sigign, sigcatch; 399 char state; 400 int res; 401 pid_t ppid = 0, pgid = -1, sid = -1; 402 int num_threads = 0; 403 struct mm_struct *mm; 404 unsigned long long start_time; 405 unsigned long cmin_flt = 0, cmaj_flt = 0; 406 unsigned long min_flt = 0, maj_flt = 0; 407 cputime_t cutime, cstime, utime, stime; 408 cputime_t cgtime, gtime; 409 unsigned long rsslim = 0; 410 char tcomm[sizeof(task->comm)]; 411 unsigned long flags; 412 struct pid_namespace *ns; 413 414 ns = current->nsproxy->pid_ns; 415 416 state = *get_task_state(task); 417 vsize = eip = esp = 0; 418 mm = get_task_mm(task); 419 if (mm) { 420 vsize = task_vsize(mm); 421 eip = KSTK_EIP(task); 422 esp = KSTK_ESP(task); 423 } 424 425 get_task_comm(tcomm, task); 426 427 sigemptyset(&sigign); 428 sigemptyset(&sigcatch); 429 cutime = cstime = utime = stime = cputime_zero; 430 cgtime = gtime = cputime_zero; 431 432 rcu_read_lock(); 433 if (lock_task_sighand(task, &flags)) { 434 struct signal_struct *sig = task->signal; 435 436 if (sig->tty) { 437 tty_pgrp = pid_nr_ns(sig->tty->pgrp, ns); 438 tty_nr = new_encode_dev(tty_devnum(sig->tty)); 439 } 440 441 num_threads = atomic_read(&sig->count); 442 collect_sigign_sigcatch(task, &sigign, &sigcatch); 443 444 cmin_flt = sig->cmin_flt; 445 cmaj_flt = sig->cmaj_flt; 446 cutime = sig->cutime; 447 cstime = sig->cstime; 448 cgtime = sig->cgtime; 449 rsslim = sig->rlim[RLIMIT_RSS].rlim_cur; 450 451 /* add up live thread stats at the group level */ 452 if (whole) { 453 struct task_struct *t = task; 454 do { 455 min_flt += t->min_flt; 456 maj_flt += t->maj_flt; 457 utime = cputime_add(utime, task_utime(t)); 458 stime = cputime_add(stime, task_stime(t)); 459 gtime = cputime_add(gtime, task_gtime(t)); 460 t = next_thread(t); 461 } while (t != task); 462 463 min_flt += sig->min_flt; 464 maj_flt += sig->maj_flt; 465 utime = cputime_add(utime, sig->utime); 466 stime = cputime_add(stime, sig->stime); 467 gtime = cputime_add(gtime, sig->gtime); 468 } 469 470 sid = task_session_nr_ns(task, ns); 471 ppid = task_tgid_nr_ns(task->real_parent, ns); 472 pgid = task_pgrp_nr_ns(task, ns); 473 474 unlock_task_sighand(task, &flags); 475 } 476 rcu_read_unlock(); 477 478 if (!whole || num_threads < 2) 479 wchan = get_wchan(task); 480 if (!whole) { 481 min_flt = task->min_flt; 482 maj_flt = task->maj_flt; 483 utime = task_utime(task); 484 stime = task_stime(task); 485 gtime = task_gtime(task); 486 } 487 488 /* scale priority and nice values from timeslices to -20..20 */ 489 /* to make it look like a "normal" Unix priority/nice value */ 490 priority = task_prio(task); 491 nice = task_nice(task); 492 493 /* Temporary variable needed for gcc-2.96 */ 494 /* convert timespec -> nsec*/ 495 start_time = 496 (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC 497 + task->real_start_time.tv_nsec; 498 /* convert nsec -> ticks */ 499 start_time = nsec_to_clock_t(start_time); 500 501 res = sprintf(buffer, "%d (%s) %c %d %d %d %d %d %u %lu \ 502 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \ 503 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n", 504 task_pid_nr_ns(task, ns), 505 tcomm, 506 state, 507 ppid, 508 pgid, 509 sid, 510 tty_nr, 511 tty_pgrp, 512 task->flags, 513 min_flt, 514 cmin_flt, 515 maj_flt, 516 cmaj_flt, 517 cputime_to_clock_t(utime), 518 cputime_to_clock_t(stime), 519 cputime_to_clock_t(cutime), 520 cputime_to_clock_t(cstime), 521 priority, 522 nice, 523 num_threads, 524 start_time, 525 vsize, 526 mm ? get_mm_rss(mm) : 0, 527 rsslim, 528 mm ? mm->start_code : 0, 529 mm ? mm->end_code : 0, 530 mm ? mm->start_stack : 0, 531 esp, 532 eip, 533 /* The signal information here is obsolete. 534 * It must be decimal for Linux 2.0 compatibility. 535 * Use /proc/#/status for real-time signals. 536 */ 537 task->pending.signal.sig[0] & 0x7fffffffUL, 538 task->blocked.sig[0] & 0x7fffffffUL, 539 sigign .sig[0] & 0x7fffffffUL, 540 sigcatch .sig[0] & 0x7fffffffUL, 541 wchan, 542 0UL, 543 0UL, 544 task->exit_signal, 545 task_cpu(task), 546 task->rt_priority, 547 task->policy, 548 (unsigned long long)delayacct_blkio_ticks(task), 549 cputime_to_clock_t(gtime), 550 cputime_to_clock_t(cgtime)); 551 if (mm) 552 mmput(mm); 553 return res; 554 } 555 556 int proc_tid_stat(struct task_struct *task, char *buffer) 557 { 558 return do_task_stat(task, buffer, 0); 559 } 560 561 int proc_tgid_stat(struct task_struct *task, char *buffer) 562 { 563 return do_task_stat(task, buffer, 1); 564 } 565 566 int proc_pid_statm(struct task_struct *task, char *buffer) 567 { 568 int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0; 569 struct mm_struct *mm = get_task_mm(task); 570 571 if (mm) { 572 size = task_statm(mm, &shared, &text, &data, &resident); 573 mmput(mm); 574 } 575 576 return sprintf(buffer, "%d %d %d %d %d %d %d\n", 577 size, resident, shared, text, lib, data, 0); 578 } 579