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 78 #include <asm/uaccess.h> 79 #include <asm/pgtable.h> 80 #include <asm/io.h> 81 #include <asm/processor.h> 82 #include "internal.h" 83 84 /* Gcc optimizes away "strlen(x)" for constant x */ 85 #define ADDBUF(buffer, string) \ 86 do { memcpy(buffer, string, strlen(string)); \ 87 buffer += strlen(string); } while (0) 88 89 static inline char * task_name(struct task_struct *p, char * buf) 90 { 91 int i; 92 char * name; 93 char tcomm[sizeof(p->comm)]; 94 95 get_task_comm(tcomm, p); 96 97 ADDBUF(buf, "Name:\t"); 98 name = tcomm; 99 i = sizeof(tcomm); 100 do { 101 unsigned char c = *name; 102 name++; 103 i--; 104 *buf = c; 105 if (!c) 106 break; 107 if (c == '\\') { 108 buf[1] = c; 109 buf += 2; 110 continue; 111 } 112 if (c == '\n') { 113 buf[0] = '\\'; 114 buf[1] = 'n'; 115 buf += 2; 116 continue; 117 } 118 buf++; 119 } while (i); 120 *buf = '\n'; 121 return buf+1; 122 } 123 124 /* 125 * The task state array is a strange "bitmap" of 126 * reasons to sleep. Thus "running" is zero, and 127 * you can test for combinations of others with 128 * simple bit tests. 129 */ 130 static const char *task_state_array[] = { 131 "R (running)", /* 0 */ 132 "S (sleeping)", /* 1 */ 133 "D (disk sleep)", /* 2 */ 134 "T (stopped)", /* 4 */ 135 "T (tracing stop)", /* 8 */ 136 "Z (zombie)", /* 16 */ 137 "X (dead)" /* 32 */ 138 }; 139 140 static inline const char * get_task_state(struct task_struct *tsk) 141 { 142 unsigned int state = (tsk->state & (TASK_RUNNING | 143 TASK_INTERRUPTIBLE | 144 TASK_UNINTERRUPTIBLE | 145 TASK_STOPPED | 146 TASK_TRACED)) | 147 (tsk->exit_state & (EXIT_ZOMBIE | 148 EXIT_DEAD)); 149 const char **p = &task_state_array[0]; 150 151 while (state) { 152 p++; 153 state >>= 1; 154 } 155 return *p; 156 } 157 158 static inline char * task_state(struct task_struct *p, char *buffer) 159 { 160 struct group_info *group_info; 161 int g; 162 struct fdtable *fdt = NULL; 163 164 read_lock(&tasklist_lock); 165 buffer += sprintf(buffer, 166 "State:\t%s\n" 167 "SleepAVG:\t%lu%%\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->sleep_avg/1024)*100/(1020000000/1024), 176 p->tgid, 177 p->pid, pid_alive(p) ? p->group_leader->real_parent->tgid : 0, 178 pid_alive(p) && p->ptrace ? p->parent->pid : 0, 179 p->uid, p->euid, p->suid, p->fsuid, 180 p->gid, p->egid, p->sgid, p->fsgid); 181 read_unlock(&tasklist_lock); 182 task_lock(p); 183 rcu_read_lock(); 184 if (p->files) 185 fdt = files_fdtable(p->files); 186 buffer += sprintf(buffer, 187 "FDSize:\t%d\n" 188 "Groups:\t", 189 fdt ? fdt->max_fds : 0); 190 rcu_read_unlock(); 191 192 group_info = p->group_info; 193 get_group_info(group_info); 194 task_unlock(p); 195 196 for (g = 0; g < min(group_info->ngroups,NGROUPS_SMALL); g++) 197 buffer += sprintf(buffer, "%d ", GROUP_AT(group_info,g)); 198 put_group_info(group_info); 199 200 buffer += sprintf(buffer, "\n"); 201 return buffer; 202 } 203 204 static char * render_sigset_t(const char *header, sigset_t *set, char *buffer) 205 { 206 int i, len; 207 208 len = strlen(header); 209 memcpy(buffer, header, len); 210 buffer += len; 211 212 i = _NSIG; 213 do { 214 int x = 0; 215 216 i -= 4; 217 if (sigismember(set, i+1)) x |= 1; 218 if (sigismember(set, i+2)) x |= 2; 219 if (sigismember(set, i+3)) x |= 4; 220 if (sigismember(set, i+4)) x |= 8; 221 *buffer++ = (x < 10 ? '0' : 'a' - 10) + x; 222 } while (i >= 4); 223 224 *buffer++ = '\n'; 225 *buffer = 0; 226 return buffer; 227 } 228 229 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign, 230 sigset_t *catch) 231 { 232 struct k_sigaction *k; 233 int i; 234 235 k = p->sighand->action; 236 for (i = 1; i <= _NSIG; ++i, ++k) { 237 if (k->sa.sa_handler == SIG_IGN) 238 sigaddset(ign, i); 239 else if (k->sa.sa_handler != SIG_DFL) 240 sigaddset(catch, i); 241 } 242 } 243 244 static inline char * task_sig(struct task_struct *p, char *buffer) 245 { 246 sigset_t pending, shpending, blocked, ignored, caught; 247 int num_threads = 0; 248 unsigned long qsize = 0; 249 unsigned long qlim = 0; 250 251 sigemptyset(&pending); 252 sigemptyset(&shpending); 253 sigemptyset(&blocked); 254 sigemptyset(&ignored); 255 sigemptyset(&caught); 256 257 /* Gather all the data with the appropriate locks held */ 258 read_lock(&tasklist_lock); 259 if (p->sighand) { 260 spin_lock_irq(&p->sighand->siglock); 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(&p->user->sigpending); 267 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur; 268 spin_unlock_irq(&p->sighand->siglock); 269 } 270 read_unlock(&tasklist_lock); 271 272 buffer += sprintf(buffer, "Threads:\t%d\n", num_threads); 273 buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim); 274 275 /* render them all */ 276 buffer = render_sigset_t("SigPnd:\t", &pending, buffer); 277 buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer); 278 buffer = render_sigset_t("SigBlk:\t", &blocked, buffer); 279 buffer = render_sigset_t("SigIgn:\t", &ignored, buffer); 280 buffer = render_sigset_t("SigCgt:\t", &caught, buffer); 281 282 return buffer; 283 } 284 285 static inline char *task_cap(struct task_struct *p, char *buffer) 286 { 287 return buffer + sprintf(buffer, "CapInh:\t%016x\n" 288 "CapPrm:\t%016x\n" 289 "CapEff:\t%016x\n", 290 cap_t(p->cap_inheritable), 291 cap_t(p->cap_permitted), 292 cap_t(p->cap_effective)); 293 } 294 295 int proc_pid_status(struct task_struct *task, char * buffer) 296 { 297 char * orig = buffer; 298 struct mm_struct *mm = get_task_mm(task); 299 300 buffer = task_name(task, buffer); 301 buffer = task_state(task, buffer); 302 303 if (mm) { 304 buffer = task_mem(mm, buffer); 305 mmput(mm); 306 } 307 buffer = task_sig(task, buffer); 308 buffer = task_cap(task, buffer); 309 buffer = cpuset_task_status_allowed(task, buffer); 310 #if defined(CONFIG_S390) 311 buffer = task_show_regs(task, buffer); 312 #endif 313 return buffer - orig; 314 } 315 316 static int do_task_stat(struct task_struct *task, char * buffer, int whole) 317 { 318 unsigned long vsize, eip, esp, wchan = ~0UL; 319 long priority, nice; 320 int tty_pgrp = -1, tty_nr = 0; 321 sigset_t sigign, sigcatch; 322 char state; 323 int res; 324 pid_t ppid, pgid = -1, sid = -1; 325 int num_threads = 0; 326 struct mm_struct *mm; 327 unsigned long long start_time; 328 unsigned long cmin_flt = 0, cmaj_flt = 0; 329 unsigned long min_flt = 0, maj_flt = 0; 330 cputime_t cutime, cstime, utime, stime; 331 unsigned long rsslim = 0; 332 struct task_struct *t; 333 char tcomm[sizeof(task->comm)]; 334 335 state = *get_task_state(task); 336 vsize = eip = esp = 0; 337 mm = get_task_mm(task); 338 if (mm) { 339 vsize = task_vsize(mm); 340 eip = KSTK_EIP(task); 341 esp = KSTK_ESP(task); 342 } 343 344 get_task_comm(tcomm, task); 345 346 sigemptyset(&sigign); 347 sigemptyset(&sigcatch); 348 cutime = cstime = utime = stime = cputime_zero; 349 read_lock(&tasklist_lock); 350 if (task->sighand) { 351 spin_lock_irq(&task->sighand->siglock); 352 num_threads = atomic_read(&task->signal->count); 353 collect_sigign_sigcatch(task, &sigign, &sigcatch); 354 355 /* add up live thread stats at the group level */ 356 if (whole) { 357 t = task; 358 do { 359 min_flt += t->min_flt; 360 maj_flt += t->maj_flt; 361 utime = cputime_add(utime, t->utime); 362 stime = cputime_add(stime, t->stime); 363 t = next_thread(t); 364 } while (t != task); 365 } 366 367 spin_unlock_irq(&task->sighand->siglock); 368 } 369 if (task->signal) { 370 if (task->signal->tty) { 371 tty_pgrp = task->signal->tty->pgrp; 372 tty_nr = new_encode_dev(tty_devnum(task->signal->tty)); 373 } 374 pgid = process_group(task); 375 sid = task->signal->session; 376 cmin_flt = task->signal->cmin_flt; 377 cmaj_flt = task->signal->cmaj_flt; 378 cutime = task->signal->cutime; 379 cstime = task->signal->cstime; 380 rsslim = task->signal->rlim[RLIMIT_RSS].rlim_cur; 381 if (whole) { 382 min_flt += task->signal->min_flt; 383 maj_flt += task->signal->maj_flt; 384 utime = cputime_add(utime, task->signal->utime); 385 stime = cputime_add(stime, task->signal->stime); 386 } 387 } 388 ppid = pid_alive(task) ? task->group_leader->real_parent->tgid : 0; 389 read_unlock(&tasklist_lock); 390 391 if (!whole || num_threads<2) 392 wchan = get_wchan(task); 393 if (!whole) { 394 min_flt = task->min_flt; 395 maj_flt = task->maj_flt; 396 utime = task->utime; 397 stime = task->stime; 398 } 399 400 /* scale priority and nice values from timeslices to -20..20 */ 401 /* to make it look like a "normal" Unix priority/nice value */ 402 priority = task_prio(task); 403 nice = task_nice(task); 404 405 /* Temporary variable needed for gcc-2.96 */ 406 /* convert timespec -> nsec*/ 407 start_time = (unsigned long long)task->start_time.tv_sec * NSEC_PER_SEC 408 + task->start_time.tv_nsec; 409 /* convert nsec -> ticks */ 410 start_time = nsec_to_clock_t(start_time); 411 412 res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \ 413 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \ 414 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu\n", 415 task->pid, 416 tcomm, 417 state, 418 ppid, 419 pgid, 420 sid, 421 tty_nr, 422 tty_pgrp, 423 task->flags, 424 min_flt, 425 cmin_flt, 426 maj_flt, 427 cmaj_flt, 428 cputime_to_clock_t(utime), 429 cputime_to_clock_t(stime), 430 cputime_to_clock_t(cutime), 431 cputime_to_clock_t(cstime), 432 priority, 433 nice, 434 num_threads, 435 start_time, 436 vsize, 437 mm ? get_mm_rss(mm) : 0, 438 rsslim, 439 mm ? mm->start_code : 0, 440 mm ? mm->end_code : 0, 441 mm ? mm->start_stack : 0, 442 esp, 443 eip, 444 /* The signal information here is obsolete. 445 * It must be decimal for Linux 2.0 compatibility. 446 * Use /proc/#/status for real-time signals. 447 */ 448 task->pending.signal.sig[0] & 0x7fffffffUL, 449 task->blocked.sig[0] & 0x7fffffffUL, 450 sigign .sig[0] & 0x7fffffffUL, 451 sigcatch .sig[0] & 0x7fffffffUL, 452 wchan, 453 0UL, 454 0UL, 455 task->exit_signal, 456 task_cpu(task), 457 task->rt_priority, 458 task->policy); 459 if(mm) 460 mmput(mm); 461 return res; 462 } 463 464 int proc_tid_stat(struct task_struct *task, char * buffer) 465 { 466 return do_task_stat(task, buffer, 0); 467 } 468 469 int proc_tgid_stat(struct task_struct *task, char * buffer) 470 { 471 return do_task_stat(task, buffer, 1); 472 } 473 474 int proc_pid_statm(struct task_struct *task, char *buffer) 475 { 476 int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0; 477 struct mm_struct *mm = get_task_mm(task); 478 479 if (mm) { 480 size = task_statm(mm, &shared, &text, &data, &resident); 481 mmput(mm); 482 } 483 484 return sprintf(buffer,"%d %d %d %d %d %d %d\n", 485 size, resident, shared, text, lib, data, 0); 486 } 487