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