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/config.h> 56 #include <linux/types.h> 57 #include <linux/errno.h> 58 #include <linux/time.h> 59 #include <linux/kernel.h> 60 #include <linux/kernel_stat.h> 61 #include <linux/tty.h> 62 #include <linux/string.h> 63 #include <linux/mman.h> 64 #include <linux/proc_fs.h> 65 #include <linux/ioport.h> 66 #include <linux/mm.h> 67 #include <linux/hugetlb.h> 68 #include <linux/pagemap.h> 69 #include <linux/swap.h> 70 #include <linux/slab.h> 71 #include <linux/smp.h> 72 #include <linux/signal.h> 73 #include <linux/highmem.h> 74 #include <linux/file.h> 75 #include <linux/times.h> 76 #include <linux/cpuset.h> 77 #include <linux/rcupdate.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 read_lock(&tasklist_lock); 166 buffer += sprintf(buffer, 167 "State:\t%s\n" 168 "SleepAVG:\t%lu%%\n" 169 "Tgid:\t%d\n" 170 "Pid:\t%d\n" 171 "PPid:\t%d\n" 172 "TracerPid:\t%d\n" 173 "Uid:\t%d\t%d\t%d\t%d\n" 174 "Gid:\t%d\t%d\t%d\t%d\n", 175 get_task_state(p), 176 (p->sleep_avg/1024)*100/(1020000000/1024), 177 p->tgid, 178 p->pid, pid_alive(p) ? p->group_leader->real_parent->tgid : 0, 179 pid_alive(p) && p->ptrace ? p->parent->pid : 0, 180 p->uid, p->euid, p->suid, p->fsuid, 181 p->gid, p->egid, p->sgid, p->fsgid); 182 read_unlock(&tasklist_lock); 183 task_lock(p); 184 rcu_read_lock(); 185 if (p->files) 186 fdt = files_fdtable(p->files); 187 buffer += sprintf(buffer, 188 "FDSize:\t%d\n" 189 "Groups:\t", 190 fdt ? fdt->max_fds : 0); 191 rcu_read_unlock(); 192 193 group_info = p->group_info; 194 get_group_info(group_info); 195 task_unlock(p); 196 197 for (g = 0; g < min(group_info->ngroups,NGROUPS_SMALL); g++) 198 buffer += sprintf(buffer, "%d ", GROUP_AT(group_info,g)); 199 put_group_info(group_info); 200 201 buffer += sprintf(buffer, "\n"); 202 return buffer; 203 } 204 205 static char * render_sigset_t(const char *header, sigset_t *set, char *buffer) 206 { 207 int i, len; 208 209 len = strlen(header); 210 memcpy(buffer, header, len); 211 buffer += len; 212 213 i = _NSIG; 214 do { 215 int x = 0; 216 217 i -= 4; 218 if (sigismember(set, i+1)) x |= 1; 219 if (sigismember(set, i+2)) x |= 2; 220 if (sigismember(set, i+3)) x |= 4; 221 if (sigismember(set, i+4)) x |= 8; 222 *buffer++ = (x < 10 ? '0' : 'a' - 10) + x; 223 } while (i >= 4); 224 225 *buffer++ = '\n'; 226 *buffer = 0; 227 return buffer; 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 char * task_sig(struct task_struct *p, char *buffer) 246 { 247 sigset_t pending, shpending, blocked, ignored, caught; 248 int num_threads = 0; 249 unsigned long qsize = 0; 250 unsigned long qlim = 0; 251 252 sigemptyset(&pending); 253 sigemptyset(&shpending); 254 sigemptyset(&blocked); 255 sigemptyset(&ignored); 256 sigemptyset(&caught); 257 258 /* Gather all the data with the appropriate locks held */ 259 read_lock(&tasklist_lock); 260 if (p->sighand) { 261 spin_lock_irq(&p->sighand->siglock); 262 pending = p->pending.signal; 263 shpending = p->signal->shared_pending.signal; 264 blocked = p->blocked; 265 collect_sigign_sigcatch(p, &ignored, &caught); 266 num_threads = atomic_read(&p->signal->count); 267 qsize = atomic_read(&p->user->sigpending); 268 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur; 269 spin_unlock_irq(&p->sighand->siglock); 270 } 271 read_unlock(&tasklist_lock); 272 273 buffer += sprintf(buffer, "Threads:\t%d\n", num_threads); 274 buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim); 275 276 /* render them all */ 277 buffer = render_sigset_t("SigPnd:\t", &pending, buffer); 278 buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer); 279 buffer = render_sigset_t("SigBlk:\t", &blocked, buffer); 280 buffer = render_sigset_t("SigIgn:\t", &ignored, buffer); 281 buffer = render_sigset_t("SigCgt:\t", &caught, buffer); 282 283 return buffer; 284 } 285 286 static inline char *task_cap(struct task_struct *p, char *buffer) 287 { 288 return buffer + sprintf(buffer, "CapInh:\t%016x\n" 289 "CapPrm:\t%016x\n" 290 "CapEff:\t%016x\n", 291 cap_t(p->cap_inheritable), 292 cap_t(p->cap_permitted), 293 cap_t(p->cap_effective)); 294 } 295 296 int proc_pid_status(struct task_struct *task, char * buffer) 297 { 298 char * orig = buffer; 299 struct mm_struct *mm = get_task_mm(task); 300 301 buffer = task_name(task, buffer); 302 buffer = task_state(task, buffer); 303 304 if (mm) { 305 buffer = task_mem(mm, buffer); 306 mmput(mm); 307 } 308 buffer = task_sig(task, buffer); 309 buffer = task_cap(task, buffer); 310 buffer = cpuset_task_status_allowed(task, buffer); 311 #if defined(CONFIG_S390) 312 buffer = task_show_regs(task, buffer); 313 #endif 314 return buffer - orig; 315 } 316 317 static int do_task_stat(struct task_struct *task, char * buffer, int whole) 318 { 319 unsigned long vsize, eip, esp, wchan = ~0UL; 320 long priority, nice; 321 int tty_pgrp = -1, tty_nr = 0; 322 sigset_t sigign, sigcatch; 323 char state; 324 int res; 325 pid_t ppid, pgid = -1, sid = -1; 326 int num_threads = 0; 327 struct mm_struct *mm; 328 unsigned long long start_time; 329 unsigned long cmin_flt = 0, cmaj_flt = 0; 330 unsigned long min_flt = 0, maj_flt = 0; 331 cputime_t cutime, cstime, utime, stime; 332 unsigned long rsslim = 0; 333 struct task_struct *t; 334 char tcomm[sizeof(task->comm)]; 335 336 state = *get_task_state(task); 337 vsize = eip = esp = 0; 338 mm = get_task_mm(task); 339 if (mm) { 340 vsize = task_vsize(mm); 341 eip = KSTK_EIP(task); 342 esp = KSTK_ESP(task); 343 } 344 345 get_task_comm(tcomm, task); 346 347 sigemptyset(&sigign); 348 sigemptyset(&sigcatch); 349 cutime = cstime = utime = stime = cputime_zero; 350 read_lock(&tasklist_lock); 351 if (task->sighand) { 352 spin_lock_irq(&task->sighand->siglock); 353 num_threads = atomic_read(&task->signal->count); 354 collect_sigign_sigcatch(task, &sigign, &sigcatch); 355 356 /* add up live thread stats at the group level */ 357 if (whole) { 358 t = task; 359 do { 360 min_flt += t->min_flt; 361 maj_flt += t->maj_flt; 362 utime = cputime_add(utime, t->utime); 363 stime = cputime_add(stime, t->stime); 364 t = next_thread(t); 365 } while (t != task); 366 } 367 368 spin_unlock_irq(&task->sighand->siglock); 369 } 370 if (task->signal) { 371 if (task->signal->tty) { 372 tty_pgrp = task->signal->tty->pgrp; 373 tty_nr = new_encode_dev(tty_devnum(task->signal->tty)); 374 } 375 pgid = process_group(task); 376 sid = task->signal->session; 377 cmin_flt = task->signal->cmin_flt; 378 cmaj_flt = task->signal->cmaj_flt; 379 cutime = task->signal->cutime; 380 cstime = task->signal->cstime; 381 rsslim = task->signal->rlim[RLIMIT_RSS].rlim_cur; 382 if (whole) { 383 min_flt += task->signal->min_flt; 384 maj_flt += task->signal->maj_flt; 385 utime = cputime_add(utime, task->signal->utime); 386 stime = cputime_add(stime, task->signal->stime); 387 } 388 } 389 ppid = pid_alive(task) ? task->group_leader->real_parent->tgid : 0; 390 read_unlock(&tasklist_lock); 391 392 if (!whole || num_threads<2) 393 wchan = get_wchan(task); 394 if (!whole) { 395 min_flt = task->min_flt; 396 maj_flt = task->maj_flt; 397 utime = task->utime; 398 stime = task->stime; 399 } 400 401 /* scale priority and nice values from timeslices to -20..20 */ 402 /* to make it look like a "normal" Unix priority/nice value */ 403 priority = task_prio(task); 404 nice = task_nice(task); 405 406 /* Temporary variable needed for gcc-2.96 */ 407 /* convert timespec -> nsec*/ 408 start_time = (unsigned long long)task->start_time.tv_sec * NSEC_PER_SEC 409 + task->start_time.tv_nsec; 410 /* convert nsec -> ticks */ 411 start_time = nsec_to_clock_t(start_time); 412 413 res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \ 414 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \ 415 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu\n", 416 task->pid, 417 tcomm, 418 state, 419 ppid, 420 pgid, 421 sid, 422 tty_nr, 423 tty_pgrp, 424 task->flags, 425 min_flt, 426 cmin_flt, 427 maj_flt, 428 cmaj_flt, 429 cputime_to_clock_t(utime), 430 cputime_to_clock_t(stime), 431 cputime_to_clock_t(cutime), 432 cputime_to_clock_t(cstime), 433 priority, 434 nice, 435 num_threads, 436 start_time, 437 vsize, 438 mm ? get_mm_rss(mm) : 0, 439 rsslim, 440 mm ? mm->start_code : 0, 441 mm ? mm->end_code : 0, 442 mm ? mm->start_stack : 0, 443 esp, 444 eip, 445 /* The signal information here is obsolete. 446 * It must be decimal for Linux 2.0 compatibility. 447 * Use /proc/#/status for real-time signals. 448 */ 449 task->pending.signal.sig[0] & 0x7fffffffUL, 450 task->blocked.sig[0] & 0x7fffffffUL, 451 sigign .sig[0] & 0x7fffffffUL, 452 sigcatch .sig[0] & 0x7fffffffUL, 453 wchan, 454 0UL, 455 0UL, 456 task->exit_signal, 457 task_cpu(task), 458 task->rt_priority, 459 task->policy); 460 if(mm) 461 mmput(mm); 462 return res; 463 } 464 465 int proc_tid_stat(struct task_struct *task, char * buffer) 466 { 467 return do_task_stat(task, buffer, 0); 468 } 469 470 int proc_tgid_stat(struct task_struct *task, char * buffer) 471 { 472 return do_task_stat(task, buffer, 1); 473 } 474 475 int proc_pid_statm(struct task_struct *task, char *buffer) 476 { 477 int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0; 478 struct mm_struct *mm = get_task_mm(task); 479 480 if (mm) { 481 size = task_statm(mm, &shared, &text, &data, &resident); 482 mmput(mm); 483 } 484 485 return sprintf(buffer,"%d %d %d %d %d %d %d\n", 486 size, resident, shared, text, lib, data, 0); 487 } 488