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/mm.h> 66 #include <linux/hugetlb.h> 67 #include <linux/pagemap.h> 68 #include <linux/swap.h> 69 #include <linux/slab.h> 70 #include <linux/smp.h> 71 #include <linux/signal.h> 72 #include <linux/highmem.h> 73 #include <linux/file.h> 74 #include <linux/times.h> 75 #include <linux/cpuset.h> 76 #include <linux/rcupdate.h> 77 #include <linux/delayacct.h> 78 79 #include <asm/uaccess.h> 80 #include <asm/pgtable.h> 81 #include <asm/io.h> 82 #include <asm/processor.h> 83 #include "internal.h" 84 85 /* Gcc optimizes away "strlen(x)" for constant x */ 86 #define ADDBUF(buffer, string) \ 87 do { memcpy(buffer, string, strlen(string)); \ 88 buffer += strlen(string); } while (0) 89 90 static inline char * task_name(struct task_struct *p, char * buf) 91 { 92 int i; 93 char * name; 94 char tcomm[sizeof(p->comm)]; 95 96 get_task_comm(tcomm, p); 97 98 ADDBUF(buf, "Name:\t"); 99 name = tcomm; 100 i = sizeof(tcomm); 101 do { 102 unsigned char c = *name; 103 name++; 104 i--; 105 *buf = c; 106 if (!c) 107 break; 108 if (c == '\\') { 109 buf[1] = c; 110 buf += 2; 111 continue; 112 } 113 if (c == '\n') { 114 buf[0] = '\\'; 115 buf[1] = 'n'; 116 buf += 2; 117 continue; 118 } 119 buf++; 120 } while (i); 121 *buf = '\n'; 122 return buf+1; 123 } 124 125 /* 126 * The task state array is a strange "bitmap" of 127 * reasons to sleep. Thus "running" is zero, and 128 * you can test for combinations of others with 129 * simple bit tests. 130 */ 131 static const char *task_state_array[] = { 132 "R (running)", /* 0 */ 133 "S (sleeping)", /* 1 */ 134 "D (disk sleep)", /* 2 */ 135 "T (stopped)", /* 4 */ 136 "T (tracing stop)", /* 8 */ 137 "Z (zombie)", /* 16 */ 138 "X (dead)" /* 32 */ 139 }; 140 141 static inline const char * get_task_state(struct task_struct *tsk) 142 { 143 unsigned int state = (tsk->state & (TASK_RUNNING | 144 TASK_INTERRUPTIBLE | 145 TASK_UNINTERRUPTIBLE | 146 TASK_STOPPED | 147 TASK_TRACED)) | 148 (tsk->exit_state & (EXIT_ZOMBIE | 149 EXIT_DEAD)); 150 const char **p = &task_state_array[0]; 151 152 while (state) { 153 p++; 154 state >>= 1; 155 } 156 return *p; 157 } 158 159 static inline char * task_state(struct task_struct *p, char *buffer) 160 { 161 struct group_info *group_info; 162 int g; 163 struct fdtable *fdt = NULL; 164 165 rcu_read_lock(); 166 buffer += sprintf(buffer, 167 "State:\t%s\n" 168 "Tgid:\t%d\n" 169 "Pid:\t%d\n" 170 "PPid:\t%d\n" 171 "TracerPid:\t%d\n" 172 "Uid:\t%d\t%d\t%d\t%d\n" 173 "Gid:\t%d\t%d\t%d\t%d\n", 174 get_task_state(p), 175 p->tgid, p->pid, 176 pid_alive(p) ? rcu_dereference(p->real_parent)->tgid : 0, 177 pid_alive(p) && p->ptrace ? rcu_dereference(p->parent)->pid : 0, 178 p->uid, p->euid, p->suid, p->fsuid, 179 p->gid, p->egid, p->sgid, p->fsgid); 180 181 task_lock(p); 182 if (p->files) 183 fdt = files_fdtable(p->files); 184 buffer += sprintf(buffer, 185 "FDSize:\t%d\n" 186 "Groups:\t", 187 fdt ? fdt->max_fds : 0); 188 rcu_read_unlock(); 189 190 group_info = p->group_info; 191 get_group_info(group_info); 192 task_unlock(p); 193 194 for (g = 0; g < min(group_info->ngroups,NGROUPS_SMALL); g++) 195 buffer += sprintf(buffer, "%d ", GROUP_AT(group_info,g)); 196 put_group_info(group_info); 197 198 buffer += sprintf(buffer, "\n"); 199 return buffer; 200 } 201 202 static char * render_sigset_t(const char *header, sigset_t *set, char *buffer) 203 { 204 int i, len; 205 206 len = strlen(header); 207 memcpy(buffer, header, len); 208 buffer += len; 209 210 i = _NSIG; 211 do { 212 int x = 0; 213 214 i -= 4; 215 if (sigismember(set, i+1)) x |= 1; 216 if (sigismember(set, i+2)) x |= 2; 217 if (sigismember(set, i+3)) x |= 4; 218 if (sigismember(set, i+4)) x |= 8; 219 *buffer++ = (x < 10 ? '0' : 'a' - 10) + x; 220 } while (i >= 4); 221 222 *buffer++ = '\n'; 223 *buffer = 0; 224 return buffer; 225 } 226 227 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign, 228 sigset_t *catch) 229 { 230 struct k_sigaction *k; 231 int i; 232 233 k = p->sighand->action; 234 for (i = 1; i <= _NSIG; ++i, ++k) { 235 if (k->sa.sa_handler == SIG_IGN) 236 sigaddset(ign, i); 237 else if (k->sa.sa_handler != SIG_DFL) 238 sigaddset(catch, i); 239 } 240 } 241 242 static inline char * task_sig(struct task_struct *p, char *buffer) 243 { 244 unsigned long flags; 245 sigset_t pending, shpending, blocked, ignored, caught; 246 int num_threads = 0; 247 unsigned long qsize = 0; 248 unsigned long qlim = 0; 249 250 sigemptyset(&pending); 251 sigemptyset(&shpending); 252 sigemptyset(&blocked); 253 sigemptyset(&ignored); 254 sigemptyset(&caught); 255 256 rcu_read_lock(); 257 if (lock_task_sighand(p, &flags)) { 258 pending = p->pending.signal; 259 shpending = p->signal->shared_pending.signal; 260 blocked = p->blocked; 261 collect_sigign_sigcatch(p, &ignored, &caught); 262 num_threads = atomic_read(&p->signal->count); 263 qsize = atomic_read(&p->user->sigpending); 264 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur; 265 unlock_task_sighand(p, &flags); 266 } 267 rcu_read_unlock(); 268 269 buffer += sprintf(buffer, "Threads:\t%d\n", num_threads); 270 buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim); 271 272 /* render them all */ 273 buffer = render_sigset_t("SigPnd:\t", &pending, buffer); 274 buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer); 275 buffer = render_sigset_t("SigBlk:\t", &blocked, buffer); 276 buffer = render_sigset_t("SigIgn:\t", &ignored, buffer); 277 buffer = render_sigset_t("SigCgt:\t", &caught, buffer); 278 279 return buffer; 280 } 281 282 static inline char *task_cap(struct task_struct *p, char *buffer) 283 { 284 return buffer + sprintf(buffer, "CapInh:\t%016x\n" 285 "CapPrm:\t%016x\n" 286 "CapEff:\t%016x\n", 287 cap_t(p->cap_inheritable), 288 cap_t(p->cap_permitted), 289 cap_t(p->cap_effective)); 290 } 291 292 int proc_pid_status(struct task_struct *task, char * buffer) 293 { 294 char * orig = buffer; 295 struct mm_struct *mm = get_task_mm(task); 296 297 buffer = task_name(task, buffer); 298 buffer = task_state(task, buffer); 299 300 if (mm) { 301 buffer = task_mem(mm, buffer); 302 mmput(mm); 303 } 304 buffer = task_sig(task, buffer); 305 buffer = task_cap(task, buffer); 306 buffer = cpuset_task_status_allowed(task, buffer); 307 #if defined(CONFIG_S390) 308 buffer = task_show_regs(task, buffer); 309 #endif 310 return buffer - orig; 311 } 312 313 static clock_t task_utime(struct task_struct *p) 314 { 315 clock_t utime = cputime_to_clock_t(p->utime), 316 total = utime + cputime_to_clock_t(p->stime); 317 u64 temp; 318 319 /* 320 * Use CFS's precise accounting: 321 */ 322 temp = (u64)nsec_to_clock_t(p->se.sum_exec_runtime); 323 324 if (total) { 325 temp *= utime; 326 do_div(temp, total); 327 } 328 utime = (clock_t)temp; 329 330 return utime; 331 } 332 333 static clock_t task_stime(struct task_struct *p) 334 { 335 clock_t stime = cputime_to_clock_t(p->stime); 336 337 /* 338 * Use CFS's precise accounting. (we subtract utime from 339 * the total, to make sure the total observed by userspace 340 * grows monotonically - apps rely on that): 341 */ 342 stime = nsec_to_clock_t(p->se.sum_exec_runtime) - task_utime(p); 343 344 return stime; 345 } 346 347 348 static int do_task_stat(struct task_struct *task, char * buffer, int whole) 349 { 350 unsigned long vsize, eip, esp, wchan = ~0UL; 351 long priority, nice; 352 int tty_pgrp = -1, tty_nr = 0; 353 sigset_t sigign, sigcatch; 354 char state; 355 int res; 356 pid_t ppid = 0, pgid = -1, sid = -1; 357 int num_threads = 0; 358 struct mm_struct *mm; 359 unsigned long long start_time; 360 unsigned long cmin_flt = 0, cmaj_flt = 0; 361 unsigned long min_flt = 0, maj_flt = 0; 362 cputime_t cutime, cstime; 363 clock_t utime, stime; 364 unsigned long rsslim = 0; 365 char tcomm[sizeof(task->comm)]; 366 unsigned long flags; 367 368 state = *get_task_state(task); 369 vsize = eip = esp = 0; 370 mm = get_task_mm(task); 371 if (mm) { 372 vsize = task_vsize(mm); 373 eip = KSTK_EIP(task); 374 esp = KSTK_ESP(task); 375 } 376 377 get_task_comm(tcomm, task); 378 379 sigemptyset(&sigign); 380 sigemptyset(&sigcatch); 381 cutime = cstime = cputime_zero; 382 utime = stime = 0; 383 384 rcu_read_lock(); 385 if (lock_task_sighand(task, &flags)) { 386 struct signal_struct *sig = task->signal; 387 388 if (sig->tty) { 389 tty_pgrp = pid_nr(sig->tty->pgrp); 390 tty_nr = new_encode_dev(tty_devnum(sig->tty)); 391 } 392 393 num_threads = atomic_read(&sig->count); 394 collect_sigign_sigcatch(task, &sigign, &sigcatch); 395 396 cmin_flt = sig->cmin_flt; 397 cmaj_flt = sig->cmaj_flt; 398 cutime = sig->cutime; 399 cstime = sig->cstime; 400 rsslim = sig->rlim[RLIMIT_RSS].rlim_cur; 401 402 /* add up live thread stats at the group level */ 403 if (whole) { 404 struct task_struct *t = task; 405 do { 406 min_flt += t->min_flt; 407 maj_flt += t->maj_flt; 408 utime += task_utime(t); 409 stime += task_stime(t); 410 t = next_thread(t); 411 } while (t != task); 412 413 min_flt += sig->min_flt; 414 maj_flt += sig->maj_flt; 415 utime += cputime_to_clock_t(sig->utime); 416 stime += cputime_to_clock_t(sig->stime); 417 } 418 419 sid = signal_session(sig); 420 pgid = process_group(task); 421 ppid = rcu_dereference(task->real_parent)->tgid; 422 423 unlock_task_sighand(task, &flags); 424 } 425 rcu_read_unlock(); 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 } 435 436 /* scale priority and nice values from timeslices to -20..20 */ 437 /* to make it look like a "normal" Unix priority/nice value */ 438 priority = task_prio(task); 439 nice = task_nice(task); 440 441 /* Temporary variable needed for gcc-2.96 */ 442 /* convert timespec -> nsec*/ 443 start_time = (unsigned long long)task->start_time.tv_sec * NSEC_PER_SEC 444 + task->start_time.tv_nsec; 445 /* convert nsec -> ticks */ 446 start_time = nsec_to_clock_t(start_time); 447 448 res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %u %lu \ 449 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \ 450 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu\n", 451 task->pid, 452 tcomm, 453 state, 454 ppid, 455 pgid, 456 sid, 457 tty_nr, 458 tty_pgrp, 459 task->flags, 460 min_flt, 461 cmin_flt, 462 maj_flt, 463 cmaj_flt, 464 utime, 465 stime, 466 cputime_to_clock_t(cutime), 467 cputime_to_clock_t(cstime), 468 priority, 469 nice, 470 num_threads, 471 start_time, 472 vsize, 473 mm ? get_mm_rss(mm) : 0, 474 rsslim, 475 mm ? mm->start_code : 0, 476 mm ? mm->end_code : 0, 477 mm ? mm->start_stack : 0, 478 esp, 479 eip, 480 /* The signal information here is obsolete. 481 * It must be decimal for Linux 2.0 compatibility. 482 * Use /proc/#/status for real-time signals. 483 */ 484 task->pending.signal.sig[0] & 0x7fffffffUL, 485 task->blocked.sig[0] & 0x7fffffffUL, 486 sigign .sig[0] & 0x7fffffffUL, 487 sigcatch .sig[0] & 0x7fffffffUL, 488 wchan, 489 0UL, 490 0UL, 491 task->exit_signal, 492 task_cpu(task), 493 task->rt_priority, 494 task->policy, 495 (unsigned long long)delayacct_blkio_ticks(task)); 496 if(mm) 497 mmput(mm); 498 return res; 499 } 500 501 int proc_tid_stat(struct task_struct *task, char * buffer) 502 { 503 return do_task_stat(task, buffer, 0); 504 } 505 506 int proc_tgid_stat(struct task_struct *task, char * buffer) 507 { 508 return do_task_stat(task, buffer, 1); 509 } 510 511 int proc_pid_statm(struct task_struct *task, char *buffer) 512 { 513 int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0; 514 struct mm_struct *mm = get_task_mm(task); 515 516 if (mm) { 517 size = task_statm(mm, &shared, &text, &data, &resident); 518 mmput(mm); 519 } 520 521 return sprintf(buffer,"%d %d %d %d %d %d %d\n", 522 size, resident, shared, text, lib, data, 0); 523 } 524