ia64/linux-2.6.18-xen.hg

view fs/proc/array.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
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 */
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>
79 #include <asm/uaccess.h>
80 #include <asm/pgtable.h>
81 #include <asm/io.h>
82 #include <asm/processor.h>
83 #include "internal.h"
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)
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)];
96 get_task_comm(tcomm, p);
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 }
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 };
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];
152 while (state) {
153 p++;
154 state >>= 1;
155 }
156 return *p;
157 }
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;
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();
193 group_info = p->group_info;
194 get_group_info(group_info);
195 task_unlock(p);
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);
201 buffer += sprintf(buffer, "\n");
202 return buffer;
203 }
205 static char * render_sigset_t(const char *header, sigset_t *set, char *buffer)
206 {
207 int i, len;
209 len = strlen(header);
210 memcpy(buffer, header, len);
211 buffer += len;
213 i = _NSIG;
214 do {
215 int x = 0;
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);
225 *buffer++ = '\n';
226 *buffer = 0;
227 return buffer;
228 }
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;
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 }
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;
252 sigemptyset(&pending);
253 sigemptyset(&shpending);
254 sigemptyset(&blocked);
255 sigemptyset(&ignored);
256 sigemptyset(&caught);
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);
273 buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
274 buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim);
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);
283 return buffer;
284 }
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 }
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);
301 buffer = task_name(task, buffer);
302 buffer = task_state(task, buffer);
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 }
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)];
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 }
345 get_task_comm(tcomm, task);
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);
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 }
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);
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 }
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);
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);
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 %llu\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 (unsigned long long)delayacct_blkio_ticks(task));
461 if(mm)
462 mmput(mm);
463 return res;
464 }
466 int proc_tid_stat(struct task_struct *task, char * buffer)
467 {
468 return do_task_stat(task, buffer, 0);
469 }
471 int proc_tgid_stat(struct task_struct *task, char * buffer)
472 {
473 return do_task_stat(task, buffer, 1);
474 }
476 int proc_pid_statm(struct task_struct *task, char *buffer)
477 {
478 int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
479 struct mm_struct *mm = get_task_mm(task);
481 if (mm) {
482 size = task_statm(mm, &shared, &text, &data, &resident);
483 mmput(mm);
484 }
486 return sprintf(buffer,"%d %d %d %d %d %d %d\n",
487 size, resident, shared, text, lib, data, 0);
488 }