blob: c1c207c36caefeb1fcbc8d782504cfcbf1b616d8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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.
Alan Cox526719b2008-10-27 15:19:48 +000043 * <alan@lxorguk.ukuu.org.uk>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#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>
Ingo Molnar8ea02602007-07-16 09:46:31 +020065#include <linux/uaccess.h>
66#include <linux/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#include <linux/mm.h>
68#include <linux/hugetlb.h>
69#include <linux/pagemap.h>
70#include <linux/swap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#include <linux/smp.h>
72#include <linux/signal.h>
73#include <linux/highmem.h>
74#include <linux/file.h>
Al Viro9f3acc32008-04-24 07:44:08 -040075#include <linux/fdtable.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#include <linux/times.h>
77#include <linux/cpuset.h>
Dipankar Sarma4fb3a532005-09-16 19:28:13 -070078#include <linux/rcupdate.h>
Shailabh Nagar25890452006-07-14 00:24:43 -070079#include <linux/delayacct.h>
Eric W. Biedermanee992742008-02-08 04:18:31 -080080#include <linux/seq_file.h>
Pavel Emelyanovb4888932007-10-18 23:40:14 -070081#include <linux/pid_namespace.h>
Jake Edgef83ce3e2009-05-04 12:51:14 -060082#include <linux/ptrace.h>
Roland McGrath0d094ef2008-07-25 19:45:49 -070083#include <linux/tracehook.h>
Eric W. Biedermanae2975b2011-11-14 15:56:38 -080084#include <linux/user_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
Linus Torvalds1da177e2005-04-16 15:20:36 -070086#include <asm/pgtable.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070087#include <asm/processor.h>
88#include "internal.h"
89
Eric W. Biedermandf5f8312008-02-08 04:18:33 -080090static inline void task_name(struct seq_file *m, struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070091{
92 int i;
Eric W. Biedermandf5f8312008-02-08 04:18:33 -080093 char *buf, *end;
Ingo Molnar8ea02602007-07-16 09:46:31 +020094 char *name;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 char tcomm[sizeof(p->comm)];
96
97 get_task_comm(tcomm, p);
98
Alexey Dobriyan9d6de122011-01-12 17:00:32 -080099 seq_puts(m, "Name:\t");
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800100 end = m->buf + m->size;
101 buf = m->buf + m->count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 name = tcomm;
103 i = sizeof(tcomm);
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800104 while (i && (buf < end)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 unsigned char c = *name;
106 name++;
107 i--;
108 *buf = c;
109 if (!c)
110 break;
111 if (c == '\\') {
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800112 buf++;
113 if (buf < end)
114 *buf++ = c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 continue;
116 }
117 if (c == '\n') {
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800118 *buf++ = '\\';
119 if (buf < end)
120 *buf++ = 'n';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 continue;
122 }
123 buf++;
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800124 }
125 m->count = buf - m->buf;
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800126 seq_putc(m, '\n');
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127}
128
129/*
130 * The task state array is a strange "bitmap" of
131 * reasons to sleep. Thus "running" is zero, and
132 * you can test for combinations of others with
133 * simple bit tests.
134 */
Mike Frysingere130aa72011-05-26 16:25:51 -0700135static const char * const task_state_array[] = {
Peter Zijlstrae1781532009-12-17 13:16:30 +0100136 "R (running)", /* 0 */
137 "S (sleeping)", /* 1 */
138 "D (disk sleep)", /* 2 */
139 "T (stopped)", /* 4 */
140 "t (tracing stop)", /* 8 */
141 "Z (zombie)", /* 16 */
142 "X (dead)", /* 32 */
143 "x (dead)", /* 64 */
Peter Zijlstra464763c2009-12-17 13:16:29 +0100144 "K (wakekill)", /* 128 */
145 "W (waking)", /* 256 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146};
147
Ingo Molnar8ea02602007-07-16 09:46:31 +0200148static inline const char *get_task_state(struct task_struct *tsk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
Matthew Wilcox1587e2b2007-12-06 11:03:36 -0500150 unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;
Mike Frysingere130aa72011-05-26 16:25:51 -0700151 const char * const *p = &task_state_array[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
Peter Zijlstrae1781532009-12-17 13:16:30 +0100153 BUILD_BUG_ON(1 + ilog2(TASK_STATE_MAX) != ARRAY_SIZE(task_state_array));
154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 while (state) {
156 p++;
157 state >>= 1;
158 }
159 return *p;
160}
161
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800162static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
163 struct pid *pid, struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
Eric W. Biedermanae2975b2011-11-14 15:56:38 -0800165 struct user_namespace *user_ns = current_user_ns();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 struct group_info *group_info;
167 int g;
Dipankar Sarmabadf1662005-09-09 13:04:10 -0700168 struct fdtable *fdt = NULL;
David Howellsc69e8d92008-11-14 10:39:19 +1100169 const struct cred *cred;
Pavel Emelyanovb4888932007-10-18 23:40:14 -0700170 pid_t ppid, tpid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Oleg Nesterovb0fa9db2006-10-02 02:18:54 -0700172 rcu_read_lock();
Pavel Emelyanovb4888932007-10-18 23:40:14 -0700173 ppid = pid_alive(p) ?
174 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
Roland McGrath0d094ef2008-07-25 19:45:49 -0700175 tpid = 0;
176 if (pid_alive(p)) {
Tejun Heo06d98472011-06-17 16:50:40 +0200177 struct task_struct *tracer = ptrace_parent(p);
Roland McGrath0d094ef2008-07-25 19:45:49 -0700178 if (tracer)
179 tpid = task_pid_nr_ns(tracer, ns);
180 }
David Howellsde09a972010-07-29 12:45:49 +0100181 cred = get_task_cred(p);
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800182 seq_printf(m,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 "State:\t%s\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 "Tgid:\t%d\n"
185 "Pid:\t%d\n"
186 "PPid:\t%d\n"
187 "TracerPid:\t%d\n"
188 "Uid:\t%d\t%d\t%d\t%d\n"
189 "Gid:\t%d\t%d\t%d\t%d\n",
190 get_task_state(p),
Pavel Emelyanovb4888932007-10-18 23:40:14 -0700191 task_tgid_nr_ns(p, ns),
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800192 pid_nr_ns(pid, ns),
Pavel Emelyanovb4888932007-10-18 23:40:14 -0700193 ppid, tpid,
Eric W. Biedermandcb0f222012-02-09 08:48:21 -0800194 from_kuid_munged(user_ns, cred->uid),
195 from_kuid_munged(user_ns, cred->euid),
196 from_kuid_munged(user_ns, cred->suid),
197 from_kuid_munged(user_ns, cred->fsuid),
198 from_kgid_munged(user_ns, cred->gid),
199 from_kgid_munged(user_ns, cred->egid),
200 from_kgid_munged(user_ns, cred->sgid),
201 from_kgid_munged(user_ns, cred->fsgid));
Oleg Nesterovb0fa9db2006-10-02 02:18:54 -0700202
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 task_lock(p);
Dipankar Sarmabadf1662005-09-09 13:04:10 -0700204 if (p->files)
205 fdt = files_fdtable(p->files);
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800206 seq_printf(m,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 "FDSize:\t%d\n"
208 "Groups:\t",
Dipankar Sarmabadf1662005-09-09 13:04:10 -0700209 fdt ? fdt->max_fds : 0);
Dipankar Sarma4fb3a532005-09-16 19:28:13 -0700210 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
David Howellsc69e8d92008-11-14 10:39:19 +1100212 group_info = cred->group_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 task_unlock(p);
214
Ingo Molnar8ea02602007-07-16 09:46:31 +0200215 for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
Eric W. Biedermanae2975b2011-11-14 15:56:38 -0800216 seq_printf(m, "%d ",
217 from_kgid_munged(user_ns, GROUP_AT(group_info, g)));
David Howellsc69e8d92008-11-14 10:39:19 +1100218 put_cred(cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800220 seq_putc(m, '\n');
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221}
222
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800223static void render_sigset_t(struct seq_file *m, const char *header,
224 sigset_t *set)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225{
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800226 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800228 seq_puts(m, header);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230 i = _NSIG;
231 do {
232 int x = 0;
233
234 i -= 4;
235 if (sigismember(set, i+1)) x |= 1;
236 if (sigismember(set, i+2)) x |= 2;
237 if (sigismember(set, i+3)) x |= 4;
238 if (sigismember(set, i+4)) x |= 8;
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800239 seq_printf(m, "%x", x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 } while (i >= 4);
241
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800242 seq_putc(m, '\n');
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243}
244
245static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
246 sigset_t *catch)
247{
248 struct k_sigaction *k;
249 int i;
250
251 k = p->sighand->action;
252 for (i = 1; i <= _NSIG; ++i, ++k) {
253 if (k->sa.sa_handler == SIG_IGN)
254 sigaddset(ign, i);
255 else if (k->sa.sa_handler != SIG_DFL)
256 sigaddset(catch, i);
257 }
258}
259
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800260static inline void task_sig(struct seq_file *m, struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261{
Oleg Nesterov5e6b3f42006-10-02 02:18:52 -0700262 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 sigset_t pending, shpending, blocked, ignored, caught;
264 int num_threads = 0;
265 unsigned long qsize = 0;
266 unsigned long qlim = 0;
267
268 sigemptyset(&pending);
269 sigemptyset(&shpending);
270 sigemptyset(&blocked);
271 sigemptyset(&ignored);
272 sigemptyset(&caught);
273
Oleg Nesterov5e6b3f42006-10-02 02:18:52 -0700274 if (lock_task_sighand(p, &flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 pending = p->pending.signal;
276 shpending = p->signal->shared_pending.signal;
277 blocked = p->blocked;
278 collect_sigign_sigcatch(p, &ignored, &caught);
Oleg Nesterov7e498272010-05-26 14:43:22 -0700279 num_threads = get_nr_threads(p);
Paul E. McKenney7dc52152010-02-22 17:04:52 -0800280 rcu_read_lock(); /* FIXME: is this correct? */
David Howellsc69e8d92008-11-14 10:39:19 +1100281 qsize = atomic_read(&__task_cred(p)->user->sigpending);
Paul E. McKenney7dc52152010-02-22 17:04:52 -0800282 rcu_read_unlock();
Jiri Slabyd554ed892010-03-05 13:42:42 -0800283 qlim = task_rlimit(p, RLIMIT_SIGPENDING);
Oleg Nesterov5e6b3f42006-10-02 02:18:52 -0700284 unlock_task_sighand(p, &flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800287 seq_printf(m, "Threads:\t%d\n", num_threads);
288 seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
290 /* render them all */
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800291 render_sigset_t(m, "SigPnd:\t", &pending);
292 render_sigset_t(m, "ShdPnd:\t", &shpending);
293 render_sigset_t(m, "SigBlk:\t", &blocked);
294 render_sigset_t(m, "SigIgn:\t", &ignored);
295 render_sigset_t(m, "SigCgt:\t", &caught);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296}
297
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800298static void render_cap_t(struct seq_file *m, const char *header,
299 kernel_cap_t *a)
Andrew Morgane338d262008-02-04 22:29:42 -0800300{
301 unsigned __capi;
302
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800303 seq_puts(m, header);
Andrew Morgane338d262008-02-04 22:29:42 -0800304 CAP_FOR_EACH_U32(__capi) {
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800305 seq_printf(m, "%08x",
Andrew G. Morganca05a992008-05-27 22:05:17 -0700306 a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
Andrew Morgane338d262008-02-04 22:29:42 -0800307 }
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800308 seq_putc(m, '\n');
Andrew Morgane338d262008-02-04 22:29:42 -0800309}
310
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800311static inline void task_cap(struct seq_file *m, struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312{
David Howellsc69e8d92008-11-14 10:39:19 +1100313 const struct cred *cred;
314 kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
David Howellsb6dff3e2008-11-14 10:39:16 +1100315
David Howellsc69e8d92008-11-14 10:39:19 +1100316 rcu_read_lock();
317 cred = __task_cred(p);
318 cap_inheritable = cred->cap_inheritable;
319 cap_permitted = cred->cap_permitted;
320 cap_effective = cred->cap_effective;
321 cap_bset = cred->cap_bset;
322 rcu_read_unlock();
323
324 render_cap_t(m, "CapInh:\t", &cap_inheritable);
325 render_cap_t(m, "CapPrm:\t", &cap_permitted);
326 render_cap_t(m, "CapEff:\t", &cap_effective);
327 render_cap_t(m, "CapBnd:\t", &cap_bset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328}
329
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800330static inline void task_context_switch_counts(struct seq_file *m,
331 struct task_struct *p)
Maxim Uvarovb663a792007-07-15 23:40:48 -0700332{
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800333 seq_printf(m, "voluntary_ctxt_switches:\t%lu\n"
334 "nonvoluntary_ctxt_switches:\t%lu\n",
335 p->nvcsw,
336 p->nivcsw);
Maxim Uvarovb663a792007-07-15 23:40:48 -0700337}
338
Heiko Carstensd01d4822009-09-21 11:06:27 +0200339static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
340{
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800341 seq_puts(m, "Cpus_allowed:\t");
Heiko Carstensd01d4822009-09-21 11:06:27 +0200342 seq_cpumask(m, &task->cpus_allowed);
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800343 seq_putc(m, '\n');
344 seq_puts(m, "Cpus_allowed_list:\t");
Heiko Carstensd01d4822009-09-21 11:06:27 +0200345 seq_cpumask_list(m, &task->cpus_allowed);
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800346 seq_putc(m, '\n');
Heiko Carstensd01d4822009-09-21 11:06:27 +0200347}
348
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800349int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
350 struct pid *pid, struct task_struct *task)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 struct mm_struct *mm = get_task_mm(task);
353
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800354 task_name(m, task);
355 task_state(m, ns, pid, task);
Ingo Molnar8ea02602007-07-16 09:46:31 +0200356
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 if (mm) {
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800358 task_mem(m, mm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 mmput(mm);
360 }
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800361 task_sig(m, task);
362 task_cap(m, task);
Heiko Carstensd01d4822009-09-21 11:06:27 +0200363 task_cpus_allowed(m, task);
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800364 cpuset_task_status_allowed(m, task);
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800365 task_context_switch_counts(m, task);
366 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367}
368
Eric W. Biedermanee992742008-02-08 04:18:31 -0800369static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
370 struct pid *pid, struct task_struct *task, int whole)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371{
372 unsigned long vsize, eip, esp, wchan = ~0UL;
Jan Engelhardt715be1f2012-05-31 16:26:19 -0700373 int priority, nice;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 int tty_pgrp = -1, tty_nr = 0;
375 sigset_t sigign, sigcatch;
376 char state;
Ingo Molnar8ea02602007-07-16 09:46:31 +0200377 pid_t ppid = 0, pgid = -1, sid = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 int num_threads = 0;
Jake Edgef83ce3e2009-05-04 12:51:14 -0600379 int permitted;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 struct mm_struct *mm;
381 unsigned long long start_time;
382 unsigned long cmin_flt = 0, cmaj_flt = 0;
383 unsigned long min_flt = 0, maj_flt = 0;
Christian Borntraegerefe567f2007-08-23 15:18:02 +0200384 cputime_t cutime, cstime, utime, stime;
Laurent Vivier9ac52312007-10-15 17:00:19 +0200385 cputime_t cgtime, gtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 unsigned long rsslim = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 char tcomm[sizeof(task->comm)];
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700388 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
390 state = *get_task_state(task);
391 vsize = eip = esp = 0;
Eric Paris69f594a2012-01-03 12:25:15 -0500392 permitted = ptrace_may_access(task, PTRACE_MODE_READ | PTRACE_MODE_NOAUDIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 mm = get_task_mm(task);
394 if (mm) {
395 vsize = task_vsize(mm);
Jake Edgef83ce3e2009-05-04 12:51:14 -0600396 if (permitted) {
397 eip = KSTK_EIP(task);
398 esp = KSTK_ESP(task);
399 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 }
401
402 get_task_comm(tcomm, task);
403
404 sigemptyset(&sigign);
405 sigemptyset(&sigcatch);
Martin Schwidefsky64861632011-12-15 14:56:09 +0100406 cutime = cstime = utime = stime = 0;
407 cgtime = gtime = 0;
Alan Cox3cfd0882006-09-29 02:00:41 -0700408
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700409 if (lock_task_sighand(task, &flags)) {
410 struct signal_struct *sig = task->signal;
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700411
Oleg Nesterov91593502006-12-08 02:36:07 -0800412 if (sig->tty) {
Alan Cox5d0fdf12008-04-30 00:53:31 -0700413 struct pid *pgrp = tty_get_pgrp(sig->tty);
414 tty_pgrp = pid_nr_ns(pgrp, ns);
415 put_pid(pgrp);
Oleg Nesterov91593502006-12-08 02:36:07 -0800416 tty_nr = new_encode_dev(tty_devnum(sig->tty));
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700417 }
418
Oleg Nesterov7e498272010-05-26 14:43:22 -0700419 num_threads = get_nr_threads(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 collect_sigign_sigcatch(task, &sigign, &sigcatch);
421
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700422 cmin_flt = sig->cmin_flt;
423 cmaj_flt = sig->cmaj_flt;
424 cutime = sig->cutime;
425 cstime = sig->cstime;
Laurent Vivier9ac52312007-10-15 17:00:19 +0200426 cgtime = sig->cgtime;
Jiri Slabyd554ed892010-03-05 13:42:42 -0800427 rsslim = ACCESS_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700428
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 /* add up live thread stats at the group level */
430 if (whole) {
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700431 struct task_struct *t = task;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 do {
433 min_flt += t->min_flt;
434 maj_flt += t->maj_flt;
Martin Schwidefsky64861632011-12-15 14:56:09 +0100435 gtime += t->gtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 t = next_thread(t);
437 } while (t != task);
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700438
439 min_flt += sig->min_flt;
440 maj_flt += sig->maj_flt;
Hidetoshi Seto0cf55e12009-12-02 17:28:07 +0900441 thread_group_times(task, &utime, &stime);
Martin Schwidefsky64861632011-12-15 14:56:09 +0100442 gtime += sig->gtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 }
444
Pavel Emelyanovb4888932007-10-18 23:40:14 -0700445 sid = task_session_nr_ns(task, ns);
Oleg Nesterova98fdce2008-01-15 00:02:37 +0300446 ppid = task_tgid_nr_ns(task->real_parent, ns);
Pavel Emelyanovb4888932007-10-18 23:40:14 -0700447 pgid = task_pgrp_nr_ns(task, ns);
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700448
449 unlock_task_sighand(task, &flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451
Jake Edgef83ce3e2009-05-04 12:51:14 -0600452 if (permitted && (!whole || num_threads < 2))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 wchan = get_wchan(task);
454 if (!whole) {
455 min_flt = task->min_flt;
456 maj_flt = task->maj_flt;
Hidetoshi Setod180c5b2009-11-26 14:48:30 +0900457 task_times(task, &utime, &stime);
Hidetoshi Setod5b7c782009-11-26 14:49:05 +0900458 gtime = task->gtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 }
460
461 /* scale priority and nice values from timeslices to -20..20 */
462 /* to make it look like a "normal" Unix priority/nice value */
463 priority = task_prio(task);
464 nice = task_nice(task);
465
466 /* Temporary variable needed for gcc-2.96 */
467 /* convert timespec -> nsec*/
Tomas Janousek924b42d2007-07-15 23:39:42 -0700468 start_time =
469 (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
470 + task->real_start_time.tv_nsec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 /* convert nsec -> ticks */
472 start_time = nsec_to_clock_t(start_time);
473
KAMEZAWA Hiroyukibda7bad2012-03-23 15:02:54 -0700474 seq_printf(m, "%d (%s) %c", pid_nr_ns(pid, ns), tcomm, state);
475 seq_put_decimal_ll(m, ' ', ppid);
476 seq_put_decimal_ll(m, ' ', pgid);
477 seq_put_decimal_ll(m, ' ', sid);
478 seq_put_decimal_ll(m, ' ', tty_nr);
479 seq_put_decimal_ll(m, ' ', tty_pgrp);
480 seq_put_decimal_ull(m, ' ', task->flags);
481 seq_put_decimal_ull(m, ' ', min_flt);
482 seq_put_decimal_ull(m, ' ', cmin_flt);
483 seq_put_decimal_ull(m, ' ', maj_flt);
484 seq_put_decimal_ull(m, ' ', cmaj_flt);
485 seq_put_decimal_ull(m, ' ', cputime_to_clock_t(utime));
486 seq_put_decimal_ull(m, ' ', cputime_to_clock_t(stime));
487 seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cutime));
488 seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cstime));
489 seq_put_decimal_ll(m, ' ', priority);
490 seq_put_decimal_ll(m, ' ', nice);
491 seq_put_decimal_ll(m, ' ', num_threads);
492 seq_put_decimal_ull(m, ' ', 0);
493 seq_put_decimal_ull(m, ' ', start_time);
494 seq_put_decimal_ull(m, ' ', vsize);
Jan Engelhardt715be1f2012-05-31 16:26:19 -0700495 seq_put_decimal_ull(m, ' ', mm ? get_mm_rss(mm) : 0);
KAMEZAWA Hiroyukibda7bad2012-03-23 15:02:54 -0700496 seq_put_decimal_ull(m, ' ', rsslim);
497 seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->start_code : 1) : 0);
498 seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->end_code : 1) : 0);
499 seq_put_decimal_ull(m, ' ', (permitted && mm) ? mm->start_stack : 0);
500 seq_put_decimal_ull(m, ' ', esp);
501 seq_put_decimal_ull(m, ' ', eip);
502 /* The signal information here is obsolete.
503 * It must be decimal for Linux 2.0 compatibility.
504 * Use /proc/#/status for real-time signals.
505 */
506 seq_put_decimal_ull(m, ' ', task->pending.signal.sig[0] & 0x7fffffffUL);
507 seq_put_decimal_ull(m, ' ', task->blocked.sig[0] & 0x7fffffffUL);
508 seq_put_decimal_ull(m, ' ', sigign.sig[0] & 0x7fffffffUL);
509 seq_put_decimal_ull(m, ' ', sigcatch.sig[0] & 0x7fffffffUL);
510 seq_put_decimal_ull(m, ' ', wchan);
511 seq_put_decimal_ull(m, ' ', 0);
512 seq_put_decimal_ull(m, ' ', 0);
513 seq_put_decimal_ll(m, ' ', task->exit_signal);
514 seq_put_decimal_ll(m, ' ', task_cpu(task));
515 seq_put_decimal_ull(m, ' ', task->rt_priority);
516 seq_put_decimal_ull(m, ' ', task->policy);
517 seq_put_decimal_ull(m, ' ', delayacct_blkio_ticks(task));
518 seq_put_decimal_ull(m, ' ', cputime_to_clock_t(gtime));
519 seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cgtime));
Cyrill Gorcunov5b1720872012-05-31 16:26:44 -0700520
521 if (mm && permitted) {
522 seq_put_decimal_ull(m, ' ', mm->start_data);
523 seq_put_decimal_ull(m, ' ', mm->end_data);
524 seq_put_decimal_ull(m, ' ', mm->start_brk);
525 seq_put_decimal_ull(m, ' ', mm->arg_start);
526 seq_put_decimal_ull(m, ' ', mm->arg_end);
527 seq_put_decimal_ull(m, ' ', mm->env_start);
528 seq_put_decimal_ull(m, ' ', mm->env_end);
529 } else
530 seq_printf(m, " 0 0 0 0 0 0 0");
531
532 if (permitted)
533 seq_put_decimal_ll(m, ' ', task->exit_code);
534 else
535 seq_put_decimal_ll(m, ' ', 0);
536
KAMEZAWA Hiroyukibda7bad2012-03-23 15:02:54 -0700537 seq_putc(m, '\n');
Ingo Molnar8ea02602007-07-16 09:46:31 +0200538 if (mm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 mmput(mm);
Eric W. Biedermanee992742008-02-08 04:18:31 -0800540 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541}
542
Eric W. Biedermanee992742008-02-08 04:18:31 -0800543int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
544 struct pid *pid, struct task_struct *task)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545{
Eric W. Biedermanee992742008-02-08 04:18:31 -0800546 return do_task_stat(m, ns, pid, task, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547}
548
Eric W. Biedermanee992742008-02-08 04:18:31 -0800549int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
550 struct pid *pid, struct task_struct *task)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551{
Eric W. Biedermanee992742008-02-08 04:18:31 -0800552 return do_task_stat(m, ns, pid, task, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553}
554
Eric W. Biedermana56d3fc2008-02-08 04:18:32 -0800555int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
556 struct pid *pid, struct task_struct *task)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557{
Alexey Dobriyana2ade7b2011-01-12 17:00:32 -0800558 unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 struct mm_struct *mm = get_task_mm(task);
Ingo Molnar8ea02602007-07-16 09:46:31 +0200560
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 if (mm) {
562 size = task_statm(mm, &shared, &text, &data, &resident);
563 mmput(mm);
564 }
KAMEZAWA Hiroyukibda7bad2012-03-23 15:02:54 -0700565 /*
566 * For quick read, open code by putting numbers directly
567 * expected format is
568 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
569 * size, resident, shared, text, data);
570 */
571 seq_put_decimal_ull(m, 0, size);
572 seq_put_decimal_ull(m, ' ', resident);
573 seq_put_decimal_ull(m, ' ', shared);
574 seq_put_decimal_ull(m, ' ', text);
575 seq_put_decimal_ull(m, ' ', 0);
KAMEZAWA Hiroyuki3748b2f2012-03-28 14:42:39 -0700576 seq_put_decimal_ull(m, ' ', data);
KAMEZAWA Hiroyukibda7bad2012-03-23 15:02:54 -0700577 seq_put_decimal_ull(m, ' ', 0);
578 seq_putc(m, '\n');
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
Eric W. Biedermana56d3fc2008-02-08 04:18:32 -0800580 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581}
Cyrill Gorcunov818411612012-05-31 16:26:43 -0700582
583#ifdef CONFIG_CHECKPOINT_RESTORE
584static struct pid *
585get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
586{
587 struct task_struct *start, *task;
588 struct pid *pid = NULL;
589
590 read_lock(&tasklist_lock);
591
592 start = pid_task(proc_pid(inode), PIDTYPE_PID);
593 if (!start)
594 goto out;
595
596 /*
597 * Lets try to continue searching first, this gives
598 * us significant speedup on children-rich processes.
599 */
600 if (pid_prev) {
601 task = pid_task(pid_prev, PIDTYPE_PID);
602 if (task && task->real_parent == start &&
603 !(list_empty(&task->sibling))) {
604 if (list_is_last(&task->sibling, &start->children))
605 goto out;
606 task = list_first_entry(&task->sibling,
607 struct task_struct, sibling);
608 pid = get_pid(task_pid(task));
609 goto out;
610 }
611 }
612
613 /*
614 * Slow search case.
615 *
616 * We might miss some children here if children
617 * are exited while we were not holding the lock,
618 * but it was never promised to be accurate that
619 * much.
620 *
621 * "Just suppose that the parent sleeps, but N children
622 * exit after we printed their tids. Now the slow paths
623 * skips N extra children, we miss N tasks." (c)
624 *
625 * So one need to stop or freeze the leader and all
626 * its children to get a precise result.
627 */
628 list_for_each_entry(task, &start->children, sibling) {
629 if (pos-- == 0) {
630 pid = get_pid(task_pid(task));
631 break;
632 }
633 }
634
635out:
636 read_unlock(&tasklist_lock);
637 return pid;
638}
639
640static int children_seq_show(struct seq_file *seq, void *v)
641{
642 struct inode *inode = seq->private;
643 pid_t pid;
644
645 pid = pid_nr_ns(v, inode->i_sb->s_fs_info);
646 return seq_printf(seq, "%d ", pid);
647}
648
649static void *children_seq_start(struct seq_file *seq, loff_t *pos)
650{
651 return get_children_pid(seq->private, NULL, *pos);
652}
653
654static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
655{
656 struct pid *pid;
657
658 pid = get_children_pid(seq->private, v, *pos + 1);
659 put_pid(v);
660
661 ++*pos;
662 return pid;
663}
664
665static void children_seq_stop(struct seq_file *seq, void *v)
666{
667 put_pid(v);
668}
669
670static const struct seq_operations children_seq_ops = {
671 .start = children_seq_start,
672 .next = children_seq_next,
673 .stop = children_seq_stop,
674 .show = children_seq_show,
675};
676
677static int children_seq_open(struct inode *inode, struct file *file)
678{
679 struct seq_file *m;
680 int ret;
681
682 ret = seq_open(file, &children_seq_ops);
683 if (ret)
684 return ret;
685
686 m = file->private_data;
687 m->private = inode;
688
689 return ret;
690}
691
692int children_seq_release(struct inode *inode, struct file *file)
693{
694 seq_release(inode, file);
695 return 0;
696}
697
698const struct file_operations proc_tid_children_operations = {
699 .open = children_seq_open,
700 .read = seq_read,
701 .llseek = seq_lseek,
702 .release = children_seq_release,
703};
704#endif /* CONFIG_CHECKPOINT_RESTORE */