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/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/fdtable.h> 77 #include <linux/times.h> 78 #include <linux/cpuset.h> 79 #include <linux/rcupdate.h> 80 #include <linux/delayacct.h> 81 #include <linux/seq_file.h> 82 #include <linux/pid_namespace.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 }; 143 144 static inline const char *get_task_state(struct task_struct *tsk) 145 { 146 unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state; 147 const char **p = &task_state_array[0]; 148 149 while (state) { 150 p++; 151 state >>= 1; 152 } 153 return *p; 154 } 155 156 static inline void task_state(struct seq_file *m, struct pid_namespace *ns, 157 struct pid *pid, struct task_struct *p) 158 { 159 struct group_info *group_info; 160 int g; 161 struct fdtable *fdt = NULL; 162 const struct cred *cred; 163 pid_t ppid, tpid; 164 165 rcu_read_lock(); 166 ppid = pid_alive(p) ? 167 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0; 168 tpid = 0; 169 if (pid_alive(p)) { 170 struct task_struct *tracer = tracehook_tracer_task(p); 171 if (tracer) 172 tpid = task_pid_nr_ns(tracer, ns); 173 } 174 cred = get_cred((struct cred *) __task_cred(p)); 175 seq_printf(m, 176 "State:\t%s\n" 177 "Tgid:\t%d\n" 178 "Pid:\t%d\n" 179 "PPid:\t%d\n" 180 "TracerPid:\t%d\n" 181 "Uid:\t%d\t%d\t%d\t%d\n" 182 "Gid:\t%d\t%d\t%d\t%d\n", 183 get_task_state(p), 184 task_tgid_nr_ns(p, ns), 185 pid_nr_ns(pid, ns), 186 ppid, tpid, 187 cred->uid, cred->euid, cred->suid, cred->fsuid, 188 cred->gid, cred->egid, cred->sgid, cred->fsgid); 189 190 task_lock(p); 191 if (p->files) 192 fdt = files_fdtable(p->files); 193 seq_printf(m, 194 "FDSize:\t%d\n" 195 "Groups:\t", 196 fdt ? fdt->max_fds : 0); 197 rcu_read_unlock(); 198 199 group_info = cred->group_info; 200 task_unlock(p); 201 202 for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++) 203 seq_printf(m, "%d ", GROUP_AT(group_info, g)); 204 put_cred(cred); 205 206 seq_printf(m, "\n"); 207 } 208 209 static void render_sigset_t(struct seq_file *m, const char *header, 210 sigset_t *set) 211 { 212 int i; 213 214 seq_printf(m, "%s", header); 215 216 i = _NSIG; 217 do { 218 int x = 0; 219 220 i -= 4; 221 if (sigismember(set, i+1)) x |= 1; 222 if (sigismember(set, i+2)) x |= 2; 223 if (sigismember(set, i+3)) x |= 4; 224 if (sigismember(set, i+4)) x |= 8; 225 seq_printf(m, "%x", x); 226 } while (i >= 4); 227 228 seq_printf(m, "\n"); 229 } 230 231 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign, 232 sigset_t *catch) 233 { 234 struct k_sigaction *k; 235 int i; 236 237 k = p->sighand->action; 238 for (i = 1; i <= _NSIG; ++i, ++k) { 239 if (k->sa.sa_handler == SIG_IGN) 240 sigaddset(ign, i); 241 else if (k->sa.sa_handler != SIG_DFL) 242 sigaddset(catch, i); 243 } 244 } 245 246 static inline void task_sig(struct seq_file *m, struct task_struct *p) 247 { 248 unsigned long flags; 249 sigset_t pending, shpending, blocked, ignored, caught; 250 int num_threads = 0; 251 unsigned long qsize = 0; 252 unsigned long qlim = 0; 253 254 sigemptyset(&pending); 255 sigemptyset(&shpending); 256 sigemptyset(&blocked); 257 sigemptyset(&ignored); 258 sigemptyset(&caught); 259 260 if (lock_task_sighand(p, &flags)) { 261 pending = p->pending.signal; 262 shpending = p->signal->shared_pending.signal; 263 blocked = p->blocked; 264 collect_sigign_sigcatch(p, &ignored, &caught); 265 num_threads = atomic_read(&p->signal->count); 266 qsize = atomic_read(&__task_cred(p)->user->sigpending); 267 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur; 268 unlock_task_sighand(p, &flags); 269 } 270 271 seq_printf(m, "Threads:\t%d\n", num_threads); 272 seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim); 273 274 /* render them all */ 275 render_sigset_t(m, "SigPnd:\t", &pending); 276 render_sigset_t(m, "ShdPnd:\t", &shpending); 277 render_sigset_t(m, "SigBlk:\t", &blocked); 278 render_sigset_t(m, "SigIgn:\t", &ignored); 279 render_sigset_t(m, "SigCgt:\t", &caught); 280 } 281 282 static void render_cap_t(struct seq_file *m, const char *header, 283 kernel_cap_t *a) 284 { 285 unsigned __capi; 286 287 seq_printf(m, "%s", header); 288 CAP_FOR_EACH_U32(__capi) { 289 seq_printf(m, "%08x", 290 a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]); 291 } 292 seq_printf(m, "\n"); 293 } 294 295 static inline void task_cap(struct seq_file *m, struct task_struct *p) 296 { 297 const struct cred *cred; 298 kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset; 299 300 rcu_read_lock(); 301 cred = __task_cred(p); 302 cap_inheritable = cred->cap_inheritable; 303 cap_permitted = cred->cap_permitted; 304 cap_effective = cred->cap_effective; 305 cap_bset = cred->cap_bset; 306 rcu_read_unlock(); 307 308 render_cap_t(m, "CapInh:\t", &cap_inheritable); 309 render_cap_t(m, "CapPrm:\t", &cap_permitted); 310 render_cap_t(m, "CapEff:\t", &cap_effective); 311 render_cap_t(m, "CapBnd:\t", &cap_bset); 312 } 313 314 static inline void task_context_switch_counts(struct seq_file *m, 315 struct task_struct *p) 316 { 317 seq_printf(m, "voluntary_ctxt_switches:\t%lu\n" 318 "nonvoluntary_ctxt_switches:\t%lu\n", 319 p->nvcsw, 320 p->nivcsw); 321 } 322 323 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, 324 struct pid *pid, struct task_struct *task) 325 { 326 struct mm_struct *mm = get_task_mm(task); 327 328 task_name(m, task); 329 task_state(m, ns, pid, task); 330 331 if (mm) { 332 task_mem(m, mm); 333 mmput(mm); 334 } 335 task_sig(m, task); 336 task_cap(m, task); 337 cpuset_task_status_allowed(m, task); 338 #if defined(CONFIG_S390) 339 task_show_regs(m, task); 340 #endif 341 task_context_switch_counts(m, task); 342 return 0; 343 } 344 345 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 346 struct pid *pid, struct task_struct *task, int whole) 347 { 348 unsigned long vsize, eip, esp, wchan = ~0UL; 349 long priority, nice; 350 int tty_pgrp = -1, tty_nr = 0; 351 sigset_t sigign, sigcatch; 352 char state; 353 pid_t ppid = 0, pgid = -1, sid = -1; 354 int num_threads = 0; 355 struct mm_struct *mm; 356 unsigned long long start_time; 357 unsigned long cmin_flt = 0, cmaj_flt = 0; 358 unsigned long min_flt = 0, maj_flt = 0; 359 cputime_t cutime, cstime, utime, stime; 360 cputime_t cgtime, gtime; 361 unsigned long rsslim = 0; 362 char tcomm[sizeof(task->comm)]; 363 unsigned long flags; 364 365 state = *get_task_state(task); 366 vsize = eip = esp = 0; 367 mm = get_task_mm(task); 368 if (mm) { 369 vsize = task_vsize(mm); 370 eip = KSTK_EIP(task); 371 esp = KSTK_ESP(task); 372 } 373 374 get_task_comm(tcomm, task); 375 376 sigemptyset(&sigign); 377 sigemptyset(&sigcatch); 378 cutime = cstime = utime = stime = cputime_zero; 379 cgtime = gtime = cputime_zero; 380 381 if (lock_task_sighand(task, &flags)) { 382 struct signal_struct *sig = task->signal; 383 384 if (sig->tty) { 385 struct pid *pgrp = tty_get_pgrp(sig->tty); 386 tty_pgrp = pid_nr_ns(pgrp, ns); 387 put_pid(pgrp); 388 tty_nr = new_encode_dev(tty_devnum(sig->tty)); 389 } 390 391 num_threads = atomic_read(&sig->count); 392 collect_sigign_sigcatch(task, &sigign, &sigcatch); 393 394 cmin_flt = sig->cmin_flt; 395 cmaj_flt = sig->cmaj_flt; 396 cutime = sig->cutime; 397 cstime = sig->cstime; 398 cgtime = sig->cgtime; 399 rsslim = sig->rlim[RLIMIT_RSS].rlim_cur; 400 401 /* add up live thread stats at the group level */ 402 if (whole) { 403 struct task_cputime cputime; 404 struct task_struct *t = task; 405 do { 406 min_flt += t->min_flt; 407 maj_flt += t->maj_flt; 408 gtime = cputime_add(gtime, task_gtime(t)); 409 t = next_thread(t); 410 } while (t != task); 411 412 min_flt += sig->min_flt; 413 maj_flt += sig->maj_flt; 414 thread_group_cputime(task, &cputime); 415 utime = cputime.utime; 416 stime = cputime.stime; 417 gtime = cputime_add(gtime, sig->gtime); 418 } 419 420 sid = task_session_nr_ns(task, ns); 421 ppid = task_tgid_nr_ns(task->real_parent, ns); 422 pgid = task_pgrp_nr_ns(task, ns); 423 424 unlock_task_sighand(task, &flags); 425 } 426 427 if (!whole || num_threads < 2) 428 wchan = get_wchan(task); 429 if (!whole) { 430 min_flt = task->min_flt; 431 maj_flt = task->maj_flt; 432 utime = task_utime(task); 433 stime = task_stime(task); 434 gtime = task_gtime(task); 435 } 436 437 /* scale priority and nice values from timeslices to -20..20 */ 438 /* to make it look like a "normal" Unix priority/nice value */ 439 priority = task_prio(task); 440 nice = task_nice(task); 441 442 /* Temporary variable needed for gcc-2.96 */ 443 /* convert timespec -> nsec*/ 444 start_time = 445 (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC 446 + task->real_start_time.tv_nsec; 447 /* convert nsec -> ticks */ 448 start_time = nsec_to_clock_t(start_time); 449 450 seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \ 451 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \ 452 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n", 453 pid_nr_ns(pid, ns), 454 tcomm, 455 state, 456 ppid, 457 pgid, 458 sid, 459 tty_nr, 460 tty_pgrp, 461 task->flags, 462 min_flt, 463 cmin_flt, 464 maj_flt, 465 cmaj_flt, 466 cputime_to_clock_t(utime), 467 cputime_to_clock_t(stime), 468 cputime_to_clock_t(cutime), 469 cputime_to_clock_t(cstime), 470 priority, 471 nice, 472 num_threads, 473 start_time, 474 vsize, 475 mm ? get_mm_rss(mm) : 0, 476 rsslim, 477 mm ? mm->start_code : 0, 478 mm ? mm->end_code : 0, 479 mm ? mm->start_stack : 0, 480 esp, 481 eip, 482 /* The signal information here is obsolete. 483 * It must be decimal for Linux 2.0 compatibility. 484 * Use /proc/#/status for real-time signals. 485 */ 486 task->pending.signal.sig[0] & 0x7fffffffUL, 487 task->blocked.sig[0] & 0x7fffffffUL, 488 sigign .sig[0] & 0x7fffffffUL, 489 sigcatch .sig[0] & 0x7fffffffUL, 490 wchan, 491 0UL, 492 0UL, 493 task->exit_signal, 494 task_cpu(task), 495 task->rt_priority, 496 task->policy, 497 (unsigned long long)delayacct_blkio_ticks(task), 498 cputime_to_clock_t(gtime), 499 cputime_to_clock_t(cgtime)); 500 if (mm) 501 mmput(mm); 502 return 0; 503 } 504 505 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns, 506 struct pid *pid, struct task_struct *task) 507 { 508 return do_task_stat(m, ns, pid, task, 0); 509 } 510 511 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns, 512 struct pid *pid, struct task_struct *task) 513 { 514 return do_task_stat(m, ns, pid, task, 1); 515 } 516 517 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns, 518 struct pid *pid, struct task_struct *task) 519 { 520 int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0; 521 struct mm_struct *mm = get_task_mm(task); 522 523 if (mm) { 524 size = task_statm(mm, &shared, &text, &data, &resident); 525 mmput(mm); 526 } 527 seq_printf(m, "%d %d %d %d %d %d %d\n", 528 size, resident, shared, text, lib, data, 0); 529 530 return 0; 531 } 532