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