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