blob: 656e401794de5f8e2b03e975130cd3546ed5ed27 [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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143};
144
Ingo Molnar8ea02602007-07-16 09:46:31 +0200145static inline const char *get_task_state(struct task_struct *tsk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146{
Oleg Nesterov74e37202014-01-23 15:55:35 -0800147 unsigned int state = (tsk->state | tsk->exit_state) & TASK_REPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Oleg Nesterov74e37202014-01-23 15:55:35 -0800149 BUILD_BUG_ON(1 + ilog2(TASK_REPORT) != ARRAY_SIZE(task_state_array)-1);
Peter Zijlstrae1781532009-12-17 13:16:30 +0100150
Oleg Nesterov74e37202014-01-23 15:55:35 -0800151 return task_state_array[fls(state)];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152}
153
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800154static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
155 struct pid *pid, struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
Eric W. Biedermane9f238c2012-08-11 12:38:26 -0700157 struct user_namespace *user_ns = seq_user_ns(m);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 struct group_info *group_info;
159 int g;
Dipankar Sarmabadf1662005-09-09 13:04:10 -0700160 struct fdtable *fdt = NULL;
David Howellsc69e8d92008-11-14 10:39:19 +1100161 const struct cred *cred;
Pavel Emelyanovb4888932007-10-18 23:40:14 -0700162 pid_t ppid, tpid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Oleg Nesterovb0fa9db2006-10-02 02:18:54 -0700164 rcu_read_lock();
Pavel Emelyanovb4888932007-10-18 23:40:14 -0700165 ppid = pid_alive(p) ?
166 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
Roland McGrath0d094ef2008-07-25 19:45:49 -0700167 tpid = 0;
168 if (pid_alive(p)) {
Tejun Heo06d98472011-06-17 16:50:40 +0200169 struct task_struct *tracer = ptrace_parent(p);
Roland McGrath0d094ef2008-07-25 19:45:49 -0700170 if (tracer)
171 tpid = task_pid_nr_ns(tracer, ns);
172 }
David Howellsde09a972010-07-29 12:45:49 +0100173 cred = get_task_cred(p);
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800174 seq_printf(m,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 "State:\t%s\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 "Tgid:\t%d\n"
Mel Gormane29cf082013-10-07 11:29:22 +0100177 "Ngid:\t%d\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 "Pid:\t%d\n"
179 "PPid:\t%d\n"
180 "TracerPid:\t%d\n"
181 "Uid:\t%d\t%d\t%d\t%d\n"
182 "Gid:\t%d\t%d\t%d\t%d\n",
183 get_task_state(p),
Pavel Emelyanovb4888932007-10-18 23:40:14 -0700184 task_tgid_nr_ns(p, ns),
Mel Gormane29cf082013-10-07 11:29:22 +0100185 task_numa_group_id(p),
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800186 pid_nr_ns(pid, ns),
Pavel Emelyanovb4888932007-10-18 23:40:14 -0700187 ppid, tpid,
Eric W. Biedermandcb0f222012-02-09 08:48:21 -0800188 from_kuid_munged(user_ns, cred->uid),
189 from_kuid_munged(user_ns, cred->euid),
190 from_kuid_munged(user_ns, cred->suid),
191 from_kuid_munged(user_ns, cred->fsuid),
192 from_kgid_munged(user_ns, cred->gid),
193 from_kgid_munged(user_ns, cred->egid),
194 from_kgid_munged(user_ns, cred->sgid),
195 from_kgid_munged(user_ns, cred->fsgid));
Oleg Nesterovb0fa9db2006-10-02 02:18:54 -0700196
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 task_lock(p);
Dipankar Sarmabadf1662005-09-09 13:04:10 -0700198 if (p->files)
199 fdt = files_fdtable(p->files);
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800200 seq_printf(m,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 "FDSize:\t%d\n"
202 "Groups:\t",
Dipankar Sarmabadf1662005-09-09 13:04:10 -0700203 fdt ? fdt->max_fds : 0);
Dipankar Sarma4fb3a532005-09-16 19:28:13 -0700204 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
David Howellsc69e8d92008-11-14 10:39:19 +1100206 group_info = cred->group_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 task_unlock(p);
208
Artem Bityutskiy8d238022012-12-17 16:03:17 -0800209 for (g = 0; g < group_info->ngroups; g++)
Eric W. Biedermanae2975b2011-11-14 15:56:38 -0800210 seq_printf(m, "%d ",
211 from_kgid_munged(user_ns, GROUP_AT(group_info, g)));
David Howellsc69e8d92008-11-14 10:39:19 +1100212 put_cred(cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800214 seq_putc(m, '\n');
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215}
216
Cyrill Gorcunov138d22b2012-12-17 16:05:02 -0800217void render_sigset_t(struct seq_file *m, const char *header,
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800218 sigset_t *set)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219{
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800220 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800222 seq_puts(m, header);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224 i = _NSIG;
225 do {
226 int x = 0;
227
228 i -= 4;
229 if (sigismember(set, i+1)) x |= 1;
230 if (sigismember(set, i+2)) x |= 2;
231 if (sigismember(set, i+3)) x |= 4;
232 if (sigismember(set, i+4)) x |= 8;
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800233 seq_printf(m, "%x", x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 } while (i >= 4);
235
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800236 seq_putc(m, '\n');
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237}
238
239static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
240 sigset_t *catch)
241{
242 struct k_sigaction *k;
243 int i;
244
245 k = p->sighand->action;
246 for (i = 1; i <= _NSIG; ++i, ++k) {
247 if (k->sa.sa_handler == SIG_IGN)
248 sigaddset(ign, i);
249 else if (k->sa.sa_handler != SIG_DFL)
250 sigaddset(catch, i);
251 }
252}
253
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800254static inline void task_sig(struct seq_file *m, struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255{
Oleg Nesterov5e6b3f42006-10-02 02:18:52 -0700256 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 sigset_t pending, shpending, blocked, ignored, caught;
258 int num_threads = 0;
259 unsigned long qsize = 0;
260 unsigned long qlim = 0;
261
262 sigemptyset(&pending);
263 sigemptyset(&shpending);
264 sigemptyset(&blocked);
265 sigemptyset(&ignored);
266 sigemptyset(&caught);
267
Oleg Nesterov5e6b3f42006-10-02 02:18:52 -0700268 if (lock_task_sighand(p, &flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 pending = p->pending.signal;
270 shpending = p->signal->shared_pending.signal;
271 blocked = p->blocked;
272 collect_sigign_sigcatch(p, &ignored, &caught);
Oleg Nesterov7e498272010-05-26 14:43:22 -0700273 num_threads = get_nr_threads(p);
Paul E. McKenney7dc52152010-02-22 17:04:52 -0800274 rcu_read_lock(); /* FIXME: is this correct? */
David Howellsc69e8d92008-11-14 10:39:19 +1100275 qsize = atomic_read(&__task_cred(p)->user->sigpending);
Paul E. McKenney7dc52152010-02-22 17:04:52 -0800276 rcu_read_unlock();
Jiri Slabyd554ed892010-03-05 13:42:42 -0800277 qlim = task_rlimit(p, RLIMIT_SIGPENDING);
Oleg Nesterov5e6b3f42006-10-02 02:18:52 -0700278 unlock_task_sighand(p, &flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800281 seq_printf(m, "Threads:\t%d\n", num_threads);
282 seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
284 /* render them all */
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800285 render_sigset_t(m, "SigPnd:\t", &pending);
286 render_sigset_t(m, "ShdPnd:\t", &shpending);
287 render_sigset_t(m, "SigBlk:\t", &blocked);
288 render_sigset_t(m, "SigIgn:\t", &ignored);
289 render_sigset_t(m, "SigCgt:\t", &caught);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290}
291
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800292static void render_cap_t(struct seq_file *m, const char *header,
293 kernel_cap_t *a)
Andrew Morgane338d262008-02-04 22:29:42 -0800294{
295 unsigned __capi;
296
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800297 seq_puts(m, header);
Andrew Morgane338d262008-02-04 22:29:42 -0800298 CAP_FOR_EACH_U32(__capi) {
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800299 seq_printf(m, "%08x",
Andrew G. Morganca05a992008-05-27 22:05:17 -0700300 a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
Andrew Morgane338d262008-02-04 22:29:42 -0800301 }
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800302 seq_putc(m, '\n');
Andrew Morgane338d262008-02-04 22:29:42 -0800303}
304
Andrew Vagin7b9a7ec2012-12-17 16:03:10 -0800305/* Remove non-existent capabilities */
306#define NORM_CAPS(v) (v.cap[CAP_TO_INDEX(CAP_LAST_CAP)] &= \
307 CAP_TO_MASK(CAP_LAST_CAP + 1) - 1)
308
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800309static inline void task_cap(struct seq_file *m, struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310{
David Howellsc69e8d92008-11-14 10:39:19 +1100311 const struct cred *cred;
312 kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
David Howellsb6dff3e2008-11-14 10:39:16 +1100313
David Howellsc69e8d92008-11-14 10:39:19 +1100314 rcu_read_lock();
315 cred = __task_cred(p);
316 cap_inheritable = cred->cap_inheritable;
317 cap_permitted = cred->cap_permitted;
318 cap_effective = cred->cap_effective;
319 cap_bset = cred->cap_bset;
320 rcu_read_unlock();
321
Andrew Vagin7b9a7ec2012-12-17 16:03:10 -0800322 NORM_CAPS(cap_inheritable);
323 NORM_CAPS(cap_permitted);
324 NORM_CAPS(cap_effective);
325 NORM_CAPS(cap_bset);
326
David Howellsc69e8d92008-11-14 10:39:19 +1100327 render_cap_t(m, "CapInh:\t", &cap_inheritable);
328 render_cap_t(m, "CapPrm:\t", &cap_permitted);
329 render_cap_t(m, "CapEff:\t", &cap_effective);
330 render_cap_t(m, "CapBnd:\t", &cap_bset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331}
332
Kees Cook2f4b3bf2012-12-17 16:03:14 -0800333static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
334{
335#ifdef CONFIG_SECCOMP
336 seq_printf(m, "Seccomp:\t%d\n", p->seccomp.mode);
337#endif
338}
339
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800340static inline void task_context_switch_counts(struct seq_file *m,
341 struct task_struct *p)
Maxim Uvarovb663a792007-07-15 23:40:48 -0700342{
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800343 seq_printf(m, "voluntary_ctxt_switches:\t%lu\n"
344 "nonvoluntary_ctxt_switches:\t%lu\n",
345 p->nvcsw,
346 p->nivcsw);
Maxim Uvarovb663a792007-07-15 23:40:48 -0700347}
348
Heiko Carstensd01d4822009-09-21 11:06:27 +0200349static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
350{
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800351 seq_puts(m, "Cpus_allowed:\t");
Heiko Carstensd01d4822009-09-21 11:06:27 +0200352 seq_cpumask(m, &task->cpus_allowed);
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800353 seq_putc(m, '\n');
354 seq_puts(m, "Cpus_allowed_list:\t");
Heiko Carstensd01d4822009-09-21 11:06:27 +0200355 seq_cpumask_list(m, &task->cpus_allowed);
Alexey Dobriyan9d6de122011-01-12 17:00:32 -0800356 seq_putc(m, '\n');
Heiko Carstensd01d4822009-09-21 11:06:27 +0200357}
358
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800359int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
360 struct pid *pid, struct task_struct *task)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 struct mm_struct *mm = get_task_mm(task);
363
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800364 task_name(m, task);
365 task_state(m, ns, pid, task);
Ingo Molnar8ea02602007-07-16 09:46:31 +0200366
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 if (mm) {
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800368 task_mem(m, mm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 mmput(mm);
370 }
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800371 task_sig(m, task);
372 task_cap(m, task);
Kees Cook2f4b3bf2012-12-17 16:03:14 -0800373 task_seccomp(m, task);
Heiko Carstensd01d4822009-09-21 11:06:27 +0200374 task_cpus_allowed(m, task);
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800375 cpuset_task_status_allowed(m, task);
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800376 task_context_switch_counts(m, task);
377 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378}
379
Eric W. Biedermanee992742008-02-08 04:18:31 -0800380static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
381 struct pid *pid, struct task_struct *task, int whole)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382{
383 unsigned long vsize, eip, esp, wchan = ~0UL;
Jan Engelhardt715be1f2012-05-31 16:26:19 -0700384 int priority, nice;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 int tty_pgrp = -1, tty_nr = 0;
386 sigset_t sigign, sigcatch;
387 char state;
Ingo Molnar8ea02602007-07-16 09:46:31 +0200388 pid_t ppid = 0, pgid = -1, sid = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 int num_threads = 0;
Jake Edgef83ce3e2009-05-04 12:51:14 -0600390 int permitted;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 struct mm_struct *mm;
392 unsigned long long start_time;
393 unsigned long cmin_flt = 0, cmaj_flt = 0;
394 unsigned long min_flt = 0, maj_flt = 0;
Christian Borntraegerefe567f2007-08-23 15:18:02 +0200395 cputime_t cutime, cstime, utime, stime;
Laurent Vivier9ac52312007-10-15 17:00:19 +0200396 cputime_t cgtime, gtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 unsigned long rsslim = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 char tcomm[sizeof(task->comm)];
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700399 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
401 state = *get_task_state(task);
402 vsize = eip = esp = 0;
Eric Paris69f594a2012-01-03 12:25:15 -0500403 permitted = ptrace_may_access(task, PTRACE_MODE_READ | PTRACE_MODE_NOAUDIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 mm = get_task_mm(task);
405 if (mm) {
406 vsize = task_vsize(mm);
Jake Edgef83ce3e2009-05-04 12:51:14 -0600407 if (permitted) {
408 eip = KSTK_EIP(task);
409 esp = KSTK_ESP(task);
410 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 }
412
413 get_task_comm(tcomm, task);
414
415 sigemptyset(&sigign);
416 sigemptyset(&sigcatch);
Martin Schwidefsky64861632011-12-15 14:56:09 +0100417 cutime = cstime = utime = stime = 0;
418 cgtime = gtime = 0;
Alan Cox3cfd0882006-09-29 02:00:41 -0700419
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700420 if (lock_task_sighand(task, &flags)) {
421 struct signal_struct *sig = task->signal;
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700422
Oleg Nesterov91593502006-12-08 02:36:07 -0800423 if (sig->tty) {
Alan Cox5d0fdf12008-04-30 00:53:31 -0700424 struct pid *pgrp = tty_get_pgrp(sig->tty);
425 tty_pgrp = pid_nr_ns(pgrp, ns);
426 put_pid(pgrp);
Oleg Nesterov91593502006-12-08 02:36:07 -0800427 tty_nr = new_encode_dev(tty_devnum(sig->tty));
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700428 }
429
Oleg Nesterov7e498272010-05-26 14:43:22 -0700430 num_threads = get_nr_threads(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 collect_sigign_sigcatch(task, &sigign, &sigcatch);
432
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700433 cmin_flt = sig->cmin_flt;
434 cmaj_flt = sig->cmaj_flt;
435 cutime = sig->cutime;
436 cstime = sig->cstime;
Laurent Vivier9ac52312007-10-15 17:00:19 +0200437 cgtime = sig->cgtime;
Jiri Slabyd554ed892010-03-05 13:42:42 -0800438 rsslim = ACCESS_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700439
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 /* add up live thread stats at the group level */
441 if (whole) {
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700442 struct task_struct *t = task;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 do {
444 min_flt += t->min_flt;
445 maj_flt += t->maj_flt;
Frederic Weisbecker6fac4822012-11-13 14:20:55 +0100446 gtime += task_gtime(t);
Oleg Nesterov185ee402014-01-23 15:55:53 -0800447 } while_each_thread(task, t);
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700448
449 min_flt += sig->min_flt;
450 maj_flt += sig->maj_flt;
Frederic Weisbeckere80d0a1a2012-11-21 16:26:44 +0100451 thread_group_cputime_adjusted(task, &utime, &stime);
Martin Schwidefsky64861632011-12-15 14:56:09 +0100452 gtime += sig->gtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 }
454
Pavel Emelyanovb4888932007-10-18 23:40:14 -0700455 sid = task_session_nr_ns(task, ns);
Oleg Nesterova98fdce2008-01-15 00:02:37 +0300456 ppid = task_tgid_nr_ns(task->real_parent, ns);
Pavel Emelyanovb4888932007-10-18 23:40:14 -0700457 pgid = task_pgrp_nr_ns(task, ns);
Oleg Nesterova593d6e2006-10-02 02:18:53 -0700458
459 unlock_task_sighand(task, &flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
Jake Edgef83ce3e2009-05-04 12:51:14 -0600462 if (permitted && (!whole || num_threads < 2))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 wchan = get_wchan(task);
464 if (!whole) {
465 min_flt = task->min_flt;
466 maj_flt = task->maj_flt;
Frederic Weisbeckere80d0a1a2012-11-21 16:26:44 +0100467 task_cputime_adjusted(task, &utime, &stime);
Frederic Weisbecker6fac4822012-11-13 14:20:55 +0100468 gtime = task_gtime(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 }
470
471 /* scale priority and nice values from timeslices to -20..20 */
472 /* to make it look like a "normal" Unix priority/nice value */
473 priority = task_prio(task);
474 nice = task_nice(task);
475
476 /* Temporary variable needed for gcc-2.96 */
477 /* convert timespec -> nsec*/
Tomas Janousek924b42d2007-07-15 23:39:42 -0700478 start_time =
479 (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
480 + task->real_start_time.tv_nsec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 /* convert nsec -> ticks */
482 start_time = nsec_to_clock_t(start_time);
483
KAMEZAWA Hiroyukibda7bad2012-03-23 15:02:54 -0700484 seq_printf(m, "%d (%s) %c", pid_nr_ns(pid, ns), tcomm, state);
485 seq_put_decimal_ll(m, ' ', ppid);
486 seq_put_decimal_ll(m, ' ', pgid);
487 seq_put_decimal_ll(m, ' ', sid);
488 seq_put_decimal_ll(m, ' ', tty_nr);
489 seq_put_decimal_ll(m, ' ', tty_pgrp);
490 seq_put_decimal_ull(m, ' ', task->flags);
491 seq_put_decimal_ull(m, ' ', min_flt);
492 seq_put_decimal_ull(m, ' ', cmin_flt);
493 seq_put_decimal_ull(m, ' ', maj_flt);
494 seq_put_decimal_ull(m, ' ', cmaj_flt);
495 seq_put_decimal_ull(m, ' ', cputime_to_clock_t(utime));
496 seq_put_decimal_ull(m, ' ', cputime_to_clock_t(stime));
497 seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cutime));
498 seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cstime));
499 seq_put_decimal_ll(m, ' ', priority);
500 seq_put_decimal_ll(m, ' ', nice);
501 seq_put_decimal_ll(m, ' ', num_threads);
502 seq_put_decimal_ull(m, ' ', 0);
503 seq_put_decimal_ull(m, ' ', start_time);
504 seq_put_decimal_ull(m, ' ', vsize);
Jan Engelhardt715be1f2012-05-31 16:26:19 -0700505 seq_put_decimal_ull(m, ' ', mm ? get_mm_rss(mm) : 0);
KAMEZAWA Hiroyukibda7bad2012-03-23 15:02:54 -0700506 seq_put_decimal_ull(m, ' ', rsslim);
507 seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->start_code : 1) : 0);
508 seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->end_code : 1) : 0);
509 seq_put_decimal_ull(m, ' ', (permitted && mm) ? mm->start_stack : 0);
510 seq_put_decimal_ull(m, ' ', esp);
511 seq_put_decimal_ull(m, ' ', eip);
512 /* The signal information here is obsolete.
513 * It must be decimal for Linux 2.0 compatibility.
514 * Use /proc/#/status for real-time signals.
515 */
516 seq_put_decimal_ull(m, ' ', task->pending.signal.sig[0] & 0x7fffffffUL);
517 seq_put_decimal_ull(m, ' ', task->blocked.sig[0] & 0x7fffffffUL);
518 seq_put_decimal_ull(m, ' ', sigign.sig[0] & 0x7fffffffUL);
519 seq_put_decimal_ull(m, ' ', sigcatch.sig[0] & 0x7fffffffUL);
520 seq_put_decimal_ull(m, ' ', wchan);
521 seq_put_decimal_ull(m, ' ', 0);
522 seq_put_decimal_ull(m, ' ', 0);
523 seq_put_decimal_ll(m, ' ', task->exit_signal);
524 seq_put_decimal_ll(m, ' ', task_cpu(task));
525 seq_put_decimal_ull(m, ' ', task->rt_priority);
526 seq_put_decimal_ull(m, ' ', task->policy);
527 seq_put_decimal_ull(m, ' ', delayacct_blkio_ticks(task));
528 seq_put_decimal_ull(m, ' ', cputime_to_clock_t(gtime));
529 seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cgtime));
Cyrill Gorcunov5b1720872012-05-31 16:26:44 -0700530
531 if (mm && permitted) {
532 seq_put_decimal_ull(m, ' ', mm->start_data);
533 seq_put_decimal_ull(m, ' ', mm->end_data);
534 seq_put_decimal_ull(m, ' ', mm->start_brk);
535 seq_put_decimal_ull(m, ' ', mm->arg_start);
536 seq_put_decimal_ull(m, ' ', mm->arg_end);
537 seq_put_decimal_ull(m, ' ', mm->env_start);
538 seq_put_decimal_ull(m, ' ', mm->env_end);
539 } else
540 seq_printf(m, " 0 0 0 0 0 0 0");
541
542 if (permitted)
543 seq_put_decimal_ll(m, ' ', task->exit_code);
544 else
545 seq_put_decimal_ll(m, ' ', 0);
546
KAMEZAWA Hiroyukibda7bad2012-03-23 15:02:54 -0700547 seq_putc(m, '\n');
Ingo Molnar8ea02602007-07-16 09:46:31 +0200548 if (mm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 mmput(mm);
Eric W. Biedermanee992742008-02-08 04:18:31 -0800550 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551}
552
Eric W. Biedermanee992742008-02-08 04:18:31 -0800553int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
554 struct pid *pid, struct task_struct *task)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555{
Eric W. Biedermanee992742008-02-08 04:18:31 -0800556 return do_task_stat(m, ns, pid, task, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557}
558
Eric W. Biedermanee992742008-02-08 04:18:31 -0800559int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
560 struct pid *pid, struct task_struct *task)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561{
Eric W. Biedermanee992742008-02-08 04:18:31 -0800562 return do_task_stat(m, ns, pid, task, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563}
564
Eric W. Biedermana56d3fc2008-02-08 04:18:32 -0800565int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
566 struct pid *pid, struct task_struct *task)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567{
Alexey Dobriyana2ade7b2011-01-12 17:00:32 -0800568 unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 struct mm_struct *mm = get_task_mm(task);
Ingo Molnar8ea02602007-07-16 09:46:31 +0200570
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 if (mm) {
572 size = task_statm(mm, &shared, &text, &data, &resident);
573 mmput(mm);
574 }
KAMEZAWA Hiroyukibda7bad2012-03-23 15:02:54 -0700575 /*
576 * For quick read, open code by putting numbers directly
577 * expected format is
578 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
579 * size, resident, shared, text, data);
580 */
581 seq_put_decimal_ull(m, 0, size);
582 seq_put_decimal_ull(m, ' ', resident);
583 seq_put_decimal_ull(m, ' ', shared);
584 seq_put_decimal_ull(m, ' ', text);
585 seq_put_decimal_ull(m, ' ', 0);
KAMEZAWA Hiroyuki3748b2f2012-03-28 14:42:39 -0700586 seq_put_decimal_ull(m, ' ', data);
KAMEZAWA Hiroyukibda7bad2012-03-23 15:02:54 -0700587 seq_put_decimal_ull(m, ' ', 0);
588 seq_putc(m, '\n');
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
Eric W. Biedermana56d3fc2008-02-08 04:18:32 -0800590 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591}
Cyrill Gorcunov818411612012-05-31 16:26:43 -0700592
593#ifdef CONFIG_CHECKPOINT_RESTORE
594static struct pid *
595get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
596{
597 struct task_struct *start, *task;
598 struct pid *pid = NULL;
599
600 read_lock(&tasklist_lock);
601
602 start = pid_task(proc_pid(inode), PIDTYPE_PID);
603 if (!start)
604 goto out;
605
606 /*
607 * Lets try to continue searching first, this gives
608 * us significant speedup on children-rich processes.
609 */
610 if (pid_prev) {
611 task = pid_task(pid_prev, PIDTYPE_PID);
612 if (task && task->real_parent == start &&
613 !(list_empty(&task->sibling))) {
614 if (list_is_last(&task->sibling, &start->children))
615 goto out;
616 task = list_first_entry(&task->sibling,
617 struct task_struct, sibling);
618 pid = get_pid(task_pid(task));
619 goto out;
620 }
621 }
622
623 /*
624 * Slow search case.
625 *
626 * We might miss some children here if children
627 * are exited while we were not holding the lock,
628 * but it was never promised to be accurate that
629 * much.
630 *
631 * "Just suppose that the parent sleeps, but N children
632 * exit after we printed their tids. Now the slow paths
633 * skips N extra children, we miss N tasks." (c)
634 *
635 * So one need to stop or freeze the leader and all
636 * its children to get a precise result.
637 */
638 list_for_each_entry(task, &start->children, sibling) {
639 if (pos-- == 0) {
640 pid = get_pid(task_pid(task));
641 break;
642 }
643 }
644
645out:
646 read_unlock(&tasklist_lock);
647 return pid;
648}
649
650static int children_seq_show(struct seq_file *seq, void *v)
651{
652 struct inode *inode = seq->private;
653 pid_t pid;
654
655 pid = pid_nr_ns(v, inode->i_sb->s_fs_info);
656 return seq_printf(seq, "%d ", pid);
657}
658
659static void *children_seq_start(struct seq_file *seq, loff_t *pos)
660{
661 return get_children_pid(seq->private, NULL, *pos);
662}
663
664static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
665{
666 struct pid *pid;
667
668 pid = get_children_pid(seq->private, v, *pos + 1);
669 put_pid(v);
670
671 ++*pos;
672 return pid;
673}
674
675static void children_seq_stop(struct seq_file *seq, void *v)
676{
677 put_pid(v);
678}
679
680static const struct seq_operations children_seq_ops = {
681 .start = children_seq_start,
682 .next = children_seq_next,
683 .stop = children_seq_stop,
684 .show = children_seq_show,
685};
686
687static int children_seq_open(struct inode *inode, struct file *file)
688{
689 struct seq_file *m;
690 int ret;
691
692 ret = seq_open(file, &children_seq_ops);
693 if (ret)
694 return ret;
695
696 m = file->private_data;
697 m->private = inode;
698
699 return ret;
700}
701
702int children_seq_release(struct inode *inode, struct file *file)
703{
704 seq_release(inode, file);
705 return 0;
706}
707
708const struct file_operations proc_tid_children_operations = {
709 .open = children_seq_open,
710 .read = seq_read,
711 .llseek = seq_lseek,
712 .release = children_seq_release,
713};
714#endif /* CONFIG_CHECKPOINT_RESTORE */