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 * <johnsonm@stolaf.edu> 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 * <middelin@polyware.iaf.nl> 16 * 17 * Danny ter Haar : added cpuinfo 18 * <dth@cistron.nl> 19 * 20 * Alessandro Rubini : profile extension. 21 * <rubini@ipvvis.unipv.it> 22 * 23 * Jeff Tranter : added BogoMips field to cpuinfo 24 * <Jeff_Tranter@Mitel.COM> 25 * 26 * Bruno Haible : remove 4K limit for the maps file 27 * <haible@ma2s2.mathematik.uni-karlsruhe.de> 28 * 29 * Yves Arrouye : remove removal of trailing spaces in get_array. 30 * <Yves.Arrouye@marin.fdn.fr> 31 * 32 * Jerome Forissier : added per-CPU time information to /proc/stat 33 * and /proc/<pid>/cpu extension 34 * <forissier@isia.cma.fr> 35 * - Incorporation and non-SMP safe operation 36 * of forissier patch in 2.1.78 by 37 * Hans Marcus <crowbar@concepts.nl> 38 * 39 * aeb@cwi.nl : /proc/partitions 40 * 41 * 42 * Alan Cox : security fixes. 43 * <alan@lxorguk.ukuu.org.uk> 44 * 45 * Al Viro : safe handling of mm_struct 46 * 47 * Gerhard Wichert : added BIGMEM support 48 * Siemens AG <Gerhard.Wichert@pdb.siemens.de> 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/smp.h> 72 #include <linux/signal.h> 73 #include <linux/highmem.h> 74 #include <linux/file.h> 75 #include <linux/fdtable.h> 76 #include <linux/times.h> 77 #include <linux/cpuset.h> 78 #include <linux/rcupdate.h> 79 #include <linux/delayacct.h> 80 #include <linux/seq_file.h> 81 #include <linux/pid_namespace.h> 82 #include <linux/ptrace.h> 83 #include <linux/tracehook.h> 84 #include <linux/swapops.h> 85 86 #include <asm/pgtable.h> 87 #include <asm/processor.h> 88 #include "internal.h" 89 90 static inline void task_name(struct seq_file *m, struct task_struct *p) 91 { 92 int i; 93 char *buf, *end; 94 char *name; 95 char tcomm[sizeof(p->comm)]; 96 97 get_task_comm(tcomm, p); 98 99 seq_printf(m, "Name:\t"); 100 end = m->buf + m->size; 101 buf = m->buf + m->count; 102 name = tcomm; 103 i = sizeof(tcomm); 104 while (i && (buf < end)) { 105 unsigned char c = *name; 106 name++; 107 i--; 108 *buf = c; 109 if (!c) 110 break; 111 if (c == '\\') { 112 buf++; 113 if (buf < end) 114 *buf++ = c; 115 continue; 116 } 117 if (c == '\n') { 118 *buf++ = '\\'; 119 if (buf < end) 120 *buf++ = 'n'; 121 continue; 122 } 123 buf++; 124 } 125 m->count = buf - m->buf; 126 seq_printf(m, "\n"); 127 } 128 129 /* 130 * The task state array is a strange "bitmap" of 131 * reasons to sleep. Thus "running" is zero, and 132 * you can test for combinations of others with 133 * simple bit tests. 134 */ 135 static const char *task_state_array[] = { 136 "R (running)", /* 0 */ 137 "S (sleeping)", /* 1 */ 138 "D (disk sleep)", /* 2 */ 139 "T (stopped)", /* 4 */ 140 "t (tracing stop)", /* 8 */ 141 "Z (zombie)", /* 16 */ 142 "X (dead)", /* 32 */ 143 "x (dead)", /* 64 */ 144 "K (wakekill)", /* 128 */ 145 "W (waking)", /* 256 */ 146 }; 147 148 static inline const char *get_task_state(struct task_struct *tsk) 149 { 150 unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state; 151 const char **p = &task_state_array[0]; 152 153 BUILD_BUG_ON(1 + ilog2(TASK_STATE_MAX) != ARRAY_SIZE(task_state_array)); 154 155 while (state) { 156 p++; 157 state >>= 1; 158 } 159 return *p; 160 } 161 162 static inline void task_state(struct seq_file *m, struct pid_namespace *ns, 163 struct pid *pid, struct task_struct *p) 164 { 165 struct group_info *group_info; 166 int g; 167 struct fdtable *fdt = NULL; 168 const struct cred *cred; 169 pid_t ppid, tpid; 170 171 rcu_read_lock(); 172 ppid = pid_alive(p) ? 173 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0; 174 tpid = 0; 175 if (pid_alive(p)) { 176 struct task_struct *tracer = tracehook_tracer_task(p); 177 if (tracer) 178 tpid = task_pid_nr_ns(tracer, ns); 179 } 180 cred = get_cred((struct cred *) __task_cred(p)); 181 seq_printf(m, 182 "State:\t%s\n" 183 "Tgid:\t%d\n" 184 "Pid:\t%d\n" 185 "PPid:\t%d\n" 186 "TracerPid:\t%d\n" 187 "Uid:\t%d\t%d\t%d\t%d\n" 188 "Gid:\t%d\t%d\t%d\t%d\n", 189 get_task_state(p), 190 task_tgid_nr_ns(p, ns), 191 pid_nr_ns(pid, ns), 192 ppid, tpid, 193 cred->uid, cred->euid, cred->suid, cred->fsuid, 194 cred->gid, cred->egid, cred->sgid, cred->fsgid); 195 196 task_lock(p); 197 if (p->files) 198 fdt = files_fdtable(p->files); 199 seq_printf(m, 200 "FDSize:\t%d\n" 201 "Groups:\t", 202 fdt ? fdt->max_fds : 0); 203 rcu_read_unlock(); 204 205 group_info = cred->group_info; 206 task_unlock(p); 207 208 for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++) 209 seq_printf(m, "%d ", GROUP_AT(group_info, g)); 210 put_cred(cred); 211 212 seq_printf(m, "\n"); 213 } 214 215 static void render_sigset_t(struct seq_file *m, const char *header, 216 sigset_t *set) 217 { 218 int i; 219 220 seq_printf(m, "%s", header); 221 222 i = _NSIG; 223 do { 224 int x = 0; 225 226 i -= 4; 227 if (sigismember(set, i+1)) x |= 1; 228 if (sigismember(set, i+2)) x |= 2; 229 if (sigismember(set, i+3)) x |= 4; 230 if (sigismember(set, i+4)) x |= 8; 231 seq_printf(m, "%x", x); 232 } while (i >= 4); 233 234 seq_printf(m, "\n"); 235 } 236 237 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign, 238 sigset_t *catch) 239 { 240 struct k_sigaction *k; 241 int i; 242 243 k = p->sighand->action; 244 for (i = 1; i <= _NSIG; ++i, ++k) { 245 if (k->sa.sa_handler == SIG_IGN) 246 sigaddset(ign, i); 247 else if (k->sa.sa_handler != SIG_DFL) 248 sigaddset(catch, i); 249 } 250 } 251 252 static inline void task_sig(struct seq_file *m, struct task_struct *p) 253 { 254 unsigned long flags; 255 sigset_t pending, shpending, blocked, ignored, caught; 256 int num_threads = 0; 257 unsigned long qsize = 0; 258 unsigned long qlim = 0; 259 260 sigemptyset(&pending); 261 sigemptyset(&shpending); 262 sigemptyset(&blocked); 263 sigemptyset(&ignored); 264 sigemptyset(&caught); 265 266 if (lock_task_sighand(p, &flags)) { 267 pending = p->pending.signal; 268 shpending = p->signal->shared_pending.signal; 269 blocked = p->blocked; 270 collect_sigign_sigcatch(p, &ignored, &caught); 271 num_threads = atomic_read(&p->signal->count); 272 rcu_read_lock(); /* FIXME: is this correct? */ 273 qsize = atomic_read(&__task_cred(p)->user->sigpending); 274 rcu_read_unlock(); 275 qlim = task_rlimit(p, RLIMIT_SIGPENDING); 276 unlock_task_sighand(p, &flags); 277 } 278 279 seq_printf(m, "Threads:\t%d\n", num_threads); 280 seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim); 281 282 /* render them all */ 283 render_sigset_t(m, "SigPnd:\t", &pending); 284 render_sigset_t(m, "ShdPnd:\t", &shpending); 285 render_sigset_t(m, "SigBlk:\t", &blocked); 286 render_sigset_t(m, "SigIgn:\t", &ignored); 287 render_sigset_t(m, "SigCgt:\t", &caught); 288 } 289 290 static void render_cap_t(struct seq_file *m, const char *header, 291 kernel_cap_t *a) 292 { 293 unsigned __capi; 294 295 seq_printf(m, "%s", header); 296 CAP_FOR_EACH_U32(__capi) { 297 seq_printf(m, "%08x", 298 a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]); 299 } 300 seq_printf(m, "\n"); 301 } 302 303 static inline void task_cap(struct seq_file *m, struct task_struct *p) 304 { 305 const struct cred *cred; 306 kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset; 307 308 rcu_read_lock(); 309 cred = __task_cred(p); 310 cap_inheritable = cred->cap_inheritable; 311 cap_permitted = cred->cap_permitted; 312 cap_effective = cred->cap_effective; 313 cap_bset = cred->cap_bset; 314 rcu_read_unlock(); 315 316 render_cap_t(m, "CapInh:\t", &cap_inheritable); 317 render_cap_t(m, "CapPrm:\t", &cap_permitted); 318 render_cap_t(m, "CapEff:\t", &cap_effective); 319 render_cap_t(m, "CapBnd:\t", &cap_bset); 320 } 321 322 static inline void task_context_switch_counts(struct seq_file *m, 323 struct task_struct *p) 324 { 325 seq_printf(m, "voluntary_ctxt_switches:\t%lu\n" 326 "nonvoluntary_ctxt_switches:\t%lu\n", 327 p->nvcsw, 328 p->nivcsw); 329 } 330 331 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task) 332 { 333 seq_printf(m, "Cpus_allowed:\t"); 334 seq_cpumask(m, &task->cpus_allowed); 335 seq_printf(m, "\n"); 336 seq_printf(m, "Cpus_allowed_list:\t"); 337 seq_cpumask_list(m, &task->cpus_allowed); 338 seq_printf(m, "\n"); 339 } 340 341 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, 342 struct pid *pid, struct task_struct *task) 343 { 344 struct mm_struct *mm = get_task_mm(task); 345 346 task_name(m, task); 347 task_state(m, ns, pid, task); 348 349 if (mm) { 350 task_mem(m, mm); 351 mmput(mm); 352 } 353 task_sig(m, task); 354 task_cap(m, task); 355 task_cpus_allowed(m, task); 356 cpuset_task_status_allowed(m, task); 357 #if defined(CONFIG_S390) 358 task_show_regs(m, task); 359 #endif 360 task_context_switch_counts(m, task); 361 return 0; 362 } 363 364 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 365 struct pid *pid, struct task_struct *task, int whole) 366 { 367 unsigned long vsize, eip, esp, wchan = ~0UL; 368 long priority, nice; 369 int tty_pgrp = -1, tty_nr = 0; 370 sigset_t sigign, sigcatch; 371 char state; 372 pid_t ppid = 0, pgid = -1, sid = -1; 373 int num_threads = 0; 374 int permitted; 375 struct mm_struct *mm; 376 unsigned long long start_time; 377 unsigned long cmin_flt = 0, cmaj_flt = 0; 378 unsigned long min_flt = 0, maj_flt = 0; 379 cputime_t cutime, cstime, utime, stime; 380 cputime_t cgtime, gtime; 381 unsigned long rsslim = 0; 382 char tcomm[sizeof(task->comm)]; 383 unsigned long flags; 384 385 state = *get_task_state(task); 386 vsize = eip = esp = 0; 387 permitted = ptrace_may_access(task, PTRACE_MODE_READ); 388 mm = get_task_mm(task); 389 if (mm) { 390 vsize = task_vsize(mm); 391 if (permitted) { 392 eip = KSTK_EIP(task); 393 esp = KSTK_ESP(task); 394 } 395 } 396 397 get_task_comm(tcomm, task); 398 399 sigemptyset(&sigign); 400 sigemptyset(&sigcatch); 401 cutime = cstime = utime = stime = cputime_zero; 402 cgtime = gtime = cputime_zero; 403 404 if (lock_task_sighand(task, &flags)) { 405 struct signal_struct *sig = task->signal; 406 407 if (sig->tty) { 408 struct pid *pgrp = tty_get_pgrp(sig->tty); 409 tty_pgrp = pid_nr_ns(pgrp, ns); 410 put_pid(pgrp); 411 tty_nr = new_encode_dev(tty_devnum(sig->tty)); 412 } 413 414 num_threads = atomic_read(&sig->count); 415 collect_sigign_sigcatch(task, &sigign, &sigcatch); 416 417 cmin_flt = sig->cmin_flt; 418 cmaj_flt = sig->cmaj_flt; 419 cutime = sig->cutime; 420 cstime = sig->cstime; 421 cgtime = sig->cgtime; 422 rsslim = ACCESS_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur); 423 424 /* add up live thread stats at the group level */ 425 if (whole) { 426 struct task_struct *t = task; 427 do { 428 min_flt += t->min_flt; 429 maj_flt += t->maj_flt; 430 gtime = cputime_add(gtime, t->gtime); 431 t = next_thread(t); 432 } while (t != task); 433 434 min_flt += sig->min_flt; 435 maj_flt += sig->maj_flt; 436 thread_group_times(task, &utime, &stime); 437 gtime = cputime_add(gtime, sig->gtime); 438 } 439 440 sid = task_session_nr_ns(task, ns); 441 ppid = task_tgid_nr_ns(task->real_parent, ns); 442 pgid = task_pgrp_nr_ns(task, ns); 443 444 unlock_task_sighand(task, &flags); 445 } 446 447 if (permitted && (!whole || num_threads < 2)) 448 wchan = get_wchan(task); 449 if (!whole) { 450 min_flt = task->min_flt; 451 maj_flt = task->maj_flt; 452 task_times(task, &utime, &stime); 453 gtime = task->gtime; 454 } 455 456 /* scale priority and nice values from timeslices to -20..20 */ 457 /* to make it look like a "normal" Unix priority/nice value */ 458 priority = task_prio(task); 459 nice = task_nice(task); 460 461 /* Temporary variable needed for gcc-2.96 */ 462 /* convert timespec -> nsec*/ 463 start_time = 464 (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC 465 + task->real_start_time.tv_nsec; 466 /* convert nsec -> ticks */ 467 start_time = nsec_to_clock_t(start_time); 468 469 seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \ 470 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \ 471 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n", 472 pid_nr_ns(pid, ns), 473 tcomm, 474 state, 475 ppid, 476 pgid, 477 sid, 478 tty_nr, 479 tty_pgrp, 480 task->flags, 481 min_flt, 482 cmin_flt, 483 maj_flt, 484 cmaj_flt, 485 cputime_to_clock_t(utime), 486 cputime_to_clock_t(stime), 487 cputime_to_clock_t(cutime), 488 cputime_to_clock_t(cstime), 489 priority, 490 nice, 491 num_threads, 492 start_time, 493 vsize, 494 mm ? get_mm_rss(mm) : 0, 495 rsslim, 496 mm ? mm->start_code : 0, 497 mm ? mm->end_code : 0, 498 (permitted && mm) ? task->stack_start : 0, 499 esp, 500 eip, 501 /* The signal information here is obsolete. 502 * It must be decimal for Linux 2.0 compatibility. 503 * Use /proc/#/status for real-time signals. 504 */ 505 task->pending.signal.sig[0] & 0x7fffffffUL, 506 task->blocked.sig[0] & 0x7fffffffUL, 507 sigign .sig[0] & 0x7fffffffUL, 508 sigcatch .sig[0] & 0x7fffffffUL, 509 wchan, 510 0UL, 511 0UL, 512 task->exit_signal, 513 task_cpu(task), 514 task->rt_priority, 515 task->policy, 516 (unsigned long long)delayacct_blkio_ticks(task), 517 cputime_to_clock_t(gtime), 518 cputime_to_clock_t(cgtime)); 519 if (mm) 520 mmput(mm); 521 return 0; 522 } 523 524 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns, 525 struct pid *pid, struct task_struct *task) 526 { 527 return do_task_stat(m, ns, pid, task, 0); 528 } 529 530 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns, 531 struct pid *pid, struct task_struct *task) 532 { 533 return do_task_stat(m, ns, pid, task, 1); 534 } 535 536 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns, 537 struct pid *pid, struct task_struct *task) 538 { 539 int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0; 540 struct mm_struct *mm = get_task_mm(task); 541 542 if (mm) { 543 size = task_statm(mm, &shared, &text, &data, &resident); 544 mmput(mm); 545 } 546 seq_printf(m, "%d %d %d %d %d %d %d\n", 547 size, resident, shared, text, lib, data, 0); 548 549 return 0; 550 } 551