2 * linux/fs/proc/array.c
4 * Copyright (C) 1992 by Linus Torvalds
5 * based on ideas by Darren Senn
8 * Michael. K. Johnson: stat,statm extensions.
9 * <johnsonm@stolaf.edu>
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>
17 * Danny ter Haar : added cpuinfo
20 * Alessandro Rubini : profile extension.
21 * <rubini@ipvvis.unipv.it>
23 * Jeff Tranter : added BogoMips field to cpuinfo
24 * <Jeff_Tranter@Mitel.COM>
26 * Bruno Haible : remove 4K limit for the maps file
27 * <haible@ma2s2.mathematik.uni-karlsruhe.de>
29 * Yves Arrouye : remove removal of trailing spaces in get_array.
30 * <Yves.Arrouye@marin.fdn.fr>
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>
39 * aeb@cwi.nl : /proc/partitions
42 * Alan Cox : security fixes.
43 * <alan@lxorguk.ukuu.org.uk>
45 * Al Viro : safe handling of mm_struct
47 * Gerhard Wichert : added BIGMEM support
48 * Siemens AG <Gerhard.Wichert@pdb.siemens.de>
50 * Al Viro & Jeff Garzik : moved most of the thing into base.c and
51 * : proc_misc.c. The rest may eventually go into
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/sched/mm.h>
64 #include <linux/sched/numa_balancing.h>
65 #include <linux/sched/task.h>
66 #include <linux/sched/cputime.h>
67 #include <linux/proc_fs.h>
68 #include <linux/ioport.h>
69 #include <linux/uaccess.h>
72 #include <linux/hugetlb.h>
73 #include <linux/pagemap.h>
74 #include <linux/swap.h>
75 #include <linux/smp.h>
76 #include <linux/signal.h>
77 #include <linux/highmem.h>
78 #include <linux/file.h>
79 #include <linux/fdtable.h>
80 #include <linux/times.h>
81 #include <linux/cpuset.h>
82 #include <linux/rcupdate.h>
83 #include <linux/delayacct.h>
84 #include <linux/seq_file.h>
85 #include <linux/pid_namespace.h>
86 #include <linux/ptrace.h>
87 #include <linux/tracehook.h>
88 #include <linux/string_helpers.h>
89 #include <linux/user_namespace.h>
90 #include <linux/fs_struct.h>
92 #include <asm/pgtable.h>
93 #include <asm/processor.h>
96 static inline void task_name(struct seq_file
*m
, struct task_struct
*p
)
100 char tcomm
[sizeof(p
->comm
)];
103 get_task_comm(tcomm
, p
);
105 seq_puts(m
, "Name:\t");
107 size
= seq_get_buf(m
, &buf
);
108 ret
= string_escape_str(tcomm
, buf
, size
, ESCAPE_SPACE
| ESCAPE_SPECIAL
, "\n\\");
109 seq_commit(m
, ret
< size
? ret
: -1);
115 * The task state array is a strange "bitmap" of
116 * reasons to sleep. Thus "running" is zero, and
117 * you can test for combinations of others with
120 static const char * const task_state_array
[] = {
121 "R (running)", /* 0 */
122 "S (sleeping)", /* 1 */
123 "D (disk sleep)", /* 2 */
124 "T (stopped)", /* 4 */
125 "t (tracing stop)", /* 8 */
127 "Z (zombie)", /* 32 */
130 static inline const char *get_task_state(struct task_struct
*tsk
)
132 unsigned int state
= (tsk
->state
| tsk
->exit_state
) & TASK_REPORT
;
135 * Parked tasks do not run; they sit in __kthread_parkme().
136 * Without this check, we would report them as running, which is
137 * clearly wrong, so we report them as sleeping instead.
139 if (tsk
->state
== TASK_PARKED
)
140 state
= TASK_INTERRUPTIBLE
;
142 BUILD_BUG_ON(1 + ilog2(TASK_REPORT
) != ARRAY_SIZE(task_state_array
)-1);
144 return task_state_array
[fls(state
)];
147 static inline int get_task_umask(struct task_struct
*tsk
)
149 struct fs_struct
*fs
;
160 static inline void task_state(struct seq_file
*m
, struct pid_namespace
*ns
,
161 struct pid
*pid
, struct task_struct
*p
)
163 struct user_namespace
*user_ns
= seq_user_ns(m
);
164 struct group_info
*group_info
;
166 struct task_struct
*tracer
;
167 const struct cred
*cred
;
168 pid_t ppid
, tpid
= 0, tgid
, ngid
;
169 unsigned int max_fds
= 0;
172 ppid
= pid_alive(p
) ?
173 task_tgid_nr_ns(rcu_dereference(p
->real_parent
), ns
) : 0;
175 tracer
= ptrace_parent(p
);
177 tpid
= task_pid_nr_ns(tracer
, ns
);
179 tgid
= task_tgid_nr_ns(p
, ns
);
180 ngid
= task_numa_group_id(p
);
181 cred
= get_task_cred(p
);
183 umask
= get_task_umask(p
);
185 seq_printf(m
, "Umask:\t%#04o\n", umask
);
189 max_fds
= files_fdtable(p
->files
)->max_fds
;
193 seq_printf(m
, "State:\t%s", get_task_state(p
));
195 seq_put_decimal_ull(m
, "\nTgid:\t", tgid
);
196 seq_put_decimal_ull(m
, "\nNgid:\t", ngid
);
197 seq_put_decimal_ull(m
, "\nPid:\t", pid_nr_ns(pid
, ns
));
198 seq_put_decimal_ull(m
, "\nPPid:\t", ppid
);
199 seq_put_decimal_ull(m
, "\nTracerPid:\t", tpid
);
200 seq_put_decimal_ull(m
, "\nUid:\t", from_kuid_munged(user_ns
, cred
->uid
));
201 seq_put_decimal_ull(m
, "\t", from_kuid_munged(user_ns
, cred
->euid
));
202 seq_put_decimal_ull(m
, "\t", from_kuid_munged(user_ns
, cred
->suid
));
203 seq_put_decimal_ull(m
, "\t", from_kuid_munged(user_ns
, cred
->fsuid
));
204 seq_put_decimal_ull(m
, "\nGid:\t", from_kgid_munged(user_ns
, cred
->gid
));
205 seq_put_decimal_ull(m
, "\t", from_kgid_munged(user_ns
, cred
->egid
));
206 seq_put_decimal_ull(m
, "\t", from_kgid_munged(user_ns
, cred
->sgid
));
207 seq_put_decimal_ull(m
, "\t", from_kgid_munged(user_ns
, cred
->fsgid
));
208 seq_put_decimal_ull(m
, "\nFDSize:\t", max_fds
);
210 seq_puts(m
, "\nGroups:\t");
211 group_info
= cred
->group_info
;
212 for (g
= 0; g
< group_info
->ngroups
; g
++)
213 seq_put_decimal_ull(m
, g
? " " : "",
214 from_kgid_munged(user_ns
, group_info
->gid
[g
]));
216 /* Trailing space shouldn't have been added in the first place. */
220 seq_puts(m
, "\nNStgid:");
221 for (g
= ns
->level
; g
<= pid
->level
; g
++)
222 seq_put_decimal_ull(m
, "\t", task_tgid_nr_ns(p
, pid
->numbers
[g
].ns
));
223 seq_puts(m
, "\nNSpid:");
224 for (g
= ns
->level
; g
<= pid
->level
; g
++)
225 seq_put_decimal_ull(m
, "\t", task_pid_nr_ns(p
, pid
->numbers
[g
].ns
));
226 seq_puts(m
, "\nNSpgid:");
227 for (g
= ns
->level
; g
<= pid
->level
; g
++)
228 seq_put_decimal_ull(m
, "\t", task_pgrp_nr_ns(p
, pid
->numbers
[g
].ns
));
229 seq_puts(m
, "\nNSsid:");
230 for (g
= ns
->level
; g
<= pid
->level
; g
++)
231 seq_put_decimal_ull(m
, "\t", task_session_nr_ns(p
, pid
->numbers
[g
].ns
));
236 void render_sigset_t(struct seq_file
*m
, const char *header
,
248 if (sigismember(set
, i
+1)) x
|= 1;
249 if (sigismember(set
, i
+2)) x
|= 2;
250 if (sigismember(set
, i
+3)) x
|= 4;
251 if (sigismember(set
, i
+4)) x
|= 8;
252 seq_putc(m
, hex_asc
[x
]);
258 static void collect_sigign_sigcatch(struct task_struct
*p
, sigset_t
*ign
,
261 struct k_sigaction
*k
;
264 k
= p
->sighand
->action
;
265 for (i
= 1; i
<= _NSIG
; ++i
, ++k
) {
266 if (k
->sa
.sa_handler
== SIG_IGN
)
268 else if (k
->sa
.sa_handler
!= SIG_DFL
)
273 static inline void task_sig(struct seq_file
*m
, struct task_struct
*p
)
276 sigset_t pending
, shpending
, blocked
, ignored
, caught
;
278 unsigned long qsize
= 0;
279 unsigned long qlim
= 0;
281 sigemptyset(&pending
);
282 sigemptyset(&shpending
);
283 sigemptyset(&blocked
);
284 sigemptyset(&ignored
);
285 sigemptyset(&caught
);
287 if (lock_task_sighand(p
, &flags
)) {
288 pending
= p
->pending
.signal
;
289 shpending
= p
->signal
->shared_pending
.signal
;
290 blocked
= p
->blocked
;
291 collect_sigign_sigcatch(p
, &ignored
, &caught
);
292 num_threads
= get_nr_threads(p
);
293 rcu_read_lock(); /* FIXME: is this correct? */
294 qsize
= atomic_read(&__task_cred(p
)->user
->sigpending
);
296 qlim
= task_rlimit(p
, RLIMIT_SIGPENDING
);
297 unlock_task_sighand(p
, &flags
);
300 seq_put_decimal_ull(m
, "Threads:\t", num_threads
);
301 seq_put_decimal_ull(m
, "\nSigQ:\t", qsize
);
302 seq_put_decimal_ull(m
, "/", qlim
);
304 /* render them all */
305 render_sigset_t(m
, "\nSigPnd:\t", &pending
);
306 render_sigset_t(m
, "ShdPnd:\t", &shpending
);
307 render_sigset_t(m
, "SigBlk:\t", &blocked
);
308 render_sigset_t(m
, "SigIgn:\t", &ignored
);
309 render_sigset_t(m
, "SigCgt:\t", &caught
);
312 static void render_cap_t(struct seq_file
*m
, const char *header
,
318 CAP_FOR_EACH_U32(__capi
) {
319 seq_printf(m
, "%08x",
320 a
->cap
[CAP_LAST_U32
- __capi
]);
325 static inline void task_cap(struct seq_file
*m
, struct task_struct
*p
)
327 const struct cred
*cred
;
328 kernel_cap_t cap_inheritable
, cap_permitted
, cap_effective
,
329 cap_bset
, cap_ambient
;
332 cred
= __task_cred(p
);
333 cap_inheritable
= cred
->cap_inheritable
;
334 cap_permitted
= cred
->cap_permitted
;
335 cap_effective
= cred
->cap_effective
;
336 cap_bset
= cred
->cap_bset
;
337 cap_ambient
= cred
->cap_ambient
;
340 render_cap_t(m
, "CapInh:\t", &cap_inheritable
);
341 render_cap_t(m
, "CapPrm:\t", &cap_permitted
);
342 render_cap_t(m
, "CapEff:\t", &cap_effective
);
343 render_cap_t(m
, "CapBnd:\t", &cap_bset
);
344 render_cap_t(m
, "CapAmb:\t", &cap_ambient
);
347 static inline void task_seccomp(struct seq_file
*m
, struct task_struct
*p
)
349 seq_put_decimal_ull(m
, "NoNewPrivs:\t", task_no_new_privs(p
));
350 #ifdef CONFIG_SECCOMP
351 seq_put_decimal_ull(m
, "\nSeccomp:\t", p
->seccomp
.mode
);
356 static inline void task_context_switch_counts(struct seq_file
*m
,
357 struct task_struct
*p
)
359 seq_put_decimal_ull(m
, "voluntary_ctxt_switches:\t", p
->nvcsw
);
360 seq_put_decimal_ull(m
, "\nnonvoluntary_ctxt_switches:\t", p
->nivcsw
);
364 static void task_cpus_allowed(struct seq_file
*m
, struct task_struct
*task
)
366 seq_printf(m
, "Cpus_allowed:\t%*pb\n",
367 cpumask_pr_args(&task
->cpus_allowed
));
368 seq_printf(m
, "Cpus_allowed_list:\t%*pbl\n",
369 cpumask_pr_args(&task
->cpus_allowed
));
372 int proc_pid_status(struct seq_file
*m
, struct pid_namespace
*ns
,
373 struct pid
*pid
, struct task_struct
*task
)
375 struct mm_struct
*mm
= get_task_mm(task
);
378 task_state(m
, ns
, pid
, task
);
386 task_seccomp(m
, task
);
387 task_cpus_allowed(m
, task
);
388 cpuset_task_status_allowed(m
, task
);
389 task_context_switch_counts(m
, task
);
393 static int do_task_stat(struct seq_file
*m
, struct pid_namespace
*ns
,
394 struct pid
*pid
, struct task_struct
*task
, int whole
)
396 unsigned long vsize
, eip
, esp
, wchan
= 0;
398 int tty_pgrp
= -1, tty_nr
= 0;
399 sigset_t sigign
, sigcatch
;
401 pid_t ppid
= 0, pgid
= -1, sid
= -1;
404 struct mm_struct
*mm
;
405 unsigned long long start_time
;
406 unsigned long cmin_flt
= 0, cmaj_flt
= 0;
407 unsigned long min_flt
= 0, maj_flt
= 0;
408 u64 cutime
, cstime
, utime
, stime
;
410 unsigned long rsslim
= 0;
411 char tcomm
[sizeof(task
->comm
)];
414 state
= *get_task_state(task
);
415 vsize
= eip
= esp
= 0;
416 permitted
= ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
| PTRACE_MODE_NOAUDIT
);
417 mm
= get_task_mm(task
);
419 vsize
= task_vsize(mm
);
421 * esp and eip are intentionally zeroed out. There is no
422 * non-racy way to read them without freezing the task.
423 * Programs that need reliable values can use ptrace(2).
427 get_task_comm(tcomm
, task
);
429 sigemptyset(&sigign
);
430 sigemptyset(&sigcatch
);
431 cutime
= cstime
= utime
= stime
= 0;
434 if (lock_task_sighand(task
, &flags
)) {
435 struct signal_struct
*sig
= task
->signal
;
438 struct pid
*pgrp
= tty_get_pgrp(sig
->tty
);
439 tty_pgrp
= pid_nr_ns(pgrp
, ns
);
441 tty_nr
= new_encode_dev(tty_devnum(sig
->tty
));
444 num_threads
= get_nr_threads(task
);
445 collect_sigign_sigcatch(task
, &sigign
, &sigcatch
);
447 cmin_flt
= sig
->cmin_flt
;
448 cmaj_flt
= sig
->cmaj_flt
;
449 cutime
= sig
->cutime
;
450 cstime
= sig
->cstime
;
451 cgtime
= sig
->cgtime
;
452 rsslim
= ACCESS_ONCE(sig
->rlim
[RLIMIT_RSS
].rlim_cur
);
454 /* add up live thread stats at the group level */
456 struct task_struct
*t
= task
;
458 min_flt
+= t
->min_flt
;
459 maj_flt
+= t
->maj_flt
;
460 gtime
+= task_gtime(t
);
461 } while_each_thread(task
, t
);
463 min_flt
+= sig
->min_flt
;
464 maj_flt
+= sig
->maj_flt
;
465 thread_group_cputime_adjusted(task
, &utime
, &stime
);
469 sid
= task_session_nr_ns(task
, ns
);
470 ppid
= task_tgid_nr_ns(task
->real_parent
, ns
);
471 pgid
= task_pgrp_nr_ns(task
, ns
);
473 unlock_task_sighand(task
, &flags
);
476 if (permitted
&& (!whole
|| num_threads
< 2))
477 wchan
= get_wchan(task
);
479 min_flt
= task
->min_flt
;
480 maj_flt
= task
->maj_flt
;
481 task_cputime_adjusted(task
, &utime
, &stime
);
482 gtime
= task_gtime(task
);
485 /* scale priority and nice values from timeslices to -20..20 */
486 /* to make it look like a "normal" Unix priority/nice value */
487 priority
= task_prio(task
);
488 nice
= task_nice(task
);
490 /* convert nsec -> ticks */
491 start_time
= nsec_to_clock_t(task
->real_start_time
);
493 seq_printf(m
, "%d (%s) %c", pid_nr_ns(pid
, ns
), tcomm
, state
);
494 seq_put_decimal_ll(m
, " ", ppid
);
495 seq_put_decimal_ll(m
, " ", pgid
);
496 seq_put_decimal_ll(m
, " ", sid
);
497 seq_put_decimal_ll(m
, " ", tty_nr
);
498 seq_put_decimal_ll(m
, " ", tty_pgrp
);
499 seq_put_decimal_ull(m
, " ", task
->flags
);
500 seq_put_decimal_ull(m
, " ", min_flt
);
501 seq_put_decimal_ull(m
, " ", cmin_flt
);
502 seq_put_decimal_ull(m
, " ", maj_flt
);
503 seq_put_decimal_ull(m
, " ", cmaj_flt
);
504 seq_put_decimal_ull(m
, " ", nsec_to_clock_t(utime
));
505 seq_put_decimal_ull(m
, " ", nsec_to_clock_t(stime
));
506 seq_put_decimal_ll(m
, " ", nsec_to_clock_t(cutime
));
507 seq_put_decimal_ll(m
, " ", nsec_to_clock_t(cstime
));
508 seq_put_decimal_ll(m
, " ", priority
);
509 seq_put_decimal_ll(m
, " ", nice
);
510 seq_put_decimal_ll(m
, " ", num_threads
);
511 seq_put_decimal_ull(m
, " ", 0);
512 seq_put_decimal_ull(m
, " ", start_time
);
513 seq_put_decimal_ull(m
, " ", vsize
);
514 seq_put_decimal_ull(m
, " ", mm
? get_mm_rss(mm
) : 0);
515 seq_put_decimal_ull(m
, " ", rsslim
);
516 seq_put_decimal_ull(m
, " ", mm
? (permitted
? mm
->start_code
: 1) : 0);
517 seq_put_decimal_ull(m
, " ", mm
? (permitted
? mm
->end_code
: 1) : 0);
518 seq_put_decimal_ull(m
, " ", (permitted
&& mm
) ? mm
->start_stack
: 0);
519 seq_put_decimal_ull(m
, " ", esp
);
520 seq_put_decimal_ull(m
, " ", eip
);
521 /* The signal information here is obsolete.
522 * It must be decimal for Linux 2.0 compatibility.
523 * Use /proc/#/status for real-time signals.
525 seq_put_decimal_ull(m
, " ", task
->pending
.signal
.sig
[0] & 0x7fffffffUL
);
526 seq_put_decimal_ull(m
, " ", task
->blocked
.sig
[0] & 0x7fffffffUL
);
527 seq_put_decimal_ull(m
, " ", sigign
.sig
[0] & 0x7fffffffUL
);
528 seq_put_decimal_ull(m
, " ", sigcatch
.sig
[0] & 0x7fffffffUL
);
531 * We used to output the absolute kernel address, but that's an
532 * information leak - so instead we show a 0/1 flag here, to signal
533 * to user-space whether there's a wchan field in /proc/PID/wchan.
535 * This works with older implementations of procps as well.
542 seq_put_decimal_ull(m
, " ", 0);
543 seq_put_decimal_ull(m
, " ", 0);
544 seq_put_decimal_ll(m
, " ", task
->exit_signal
);
545 seq_put_decimal_ll(m
, " ", task_cpu(task
));
546 seq_put_decimal_ull(m
, " ", task
->rt_priority
);
547 seq_put_decimal_ull(m
, " ", task
->policy
);
548 seq_put_decimal_ull(m
, " ", delayacct_blkio_ticks(task
));
549 seq_put_decimal_ull(m
, " ", nsec_to_clock_t(gtime
));
550 seq_put_decimal_ll(m
, " ", nsec_to_clock_t(cgtime
));
552 if (mm
&& permitted
) {
553 seq_put_decimal_ull(m
, " ", mm
->start_data
);
554 seq_put_decimal_ull(m
, " ", mm
->end_data
);
555 seq_put_decimal_ull(m
, " ", mm
->start_brk
);
556 seq_put_decimal_ull(m
, " ", mm
->arg_start
);
557 seq_put_decimal_ull(m
, " ", mm
->arg_end
);
558 seq_put_decimal_ull(m
, " ", mm
->env_start
);
559 seq_put_decimal_ull(m
, " ", mm
->env_end
);
561 seq_puts(m
, " 0 0 0 0 0 0 0");
564 seq_put_decimal_ll(m
, " ", task
->exit_code
);
574 int proc_tid_stat(struct seq_file
*m
, struct pid_namespace
*ns
,
575 struct pid
*pid
, struct task_struct
*task
)
577 return do_task_stat(m
, ns
, pid
, task
, 0);
580 int proc_tgid_stat(struct seq_file
*m
, struct pid_namespace
*ns
,
581 struct pid
*pid
, struct task_struct
*task
)
583 return do_task_stat(m
, ns
, pid
, task
, 1);
586 int proc_pid_statm(struct seq_file
*m
, struct pid_namespace
*ns
,
587 struct pid
*pid
, struct task_struct
*task
)
589 unsigned long size
= 0, resident
= 0, shared
= 0, text
= 0, data
= 0;
590 struct mm_struct
*mm
= get_task_mm(task
);
593 size
= task_statm(mm
, &shared
, &text
, &data
, &resident
);
597 * For quick read, open code by putting numbers directly
599 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
600 * size, resident, shared, text, data);
602 seq_put_decimal_ull(m
, "", size
);
603 seq_put_decimal_ull(m
, " ", resident
);
604 seq_put_decimal_ull(m
, " ", shared
);
605 seq_put_decimal_ull(m
, " ", text
);
606 seq_put_decimal_ull(m
, " ", 0);
607 seq_put_decimal_ull(m
, " ", data
);
608 seq_put_decimal_ull(m
, " ", 0);
614 #ifdef CONFIG_PROC_CHILDREN
616 get_children_pid(struct inode
*inode
, struct pid
*pid_prev
, loff_t pos
)
618 struct task_struct
*start
, *task
;
619 struct pid
*pid
= NULL
;
621 read_lock(&tasklist_lock
);
623 start
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
628 * Lets try to continue searching first, this gives
629 * us significant speedup on children-rich processes.
632 task
= pid_task(pid_prev
, PIDTYPE_PID
);
633 if (task
&& task
->real_parent
== start
&&
634 !(list_empty(&task
->sibling
))) {
635 if (list_is_last(&task
->sibling
, &start
->children
))
637 task
= list_first_entry(&task
->sibling
,
638 struct task_struct
, sibling
);
639 pid
= get_pid(task_pid(task
));
647 * We might miss some children here if children
648 * are exited while we were not holding the lock,
649 * but it was never promised to be accurate that
652 * "Just suppose that the parent sleeps, but N children
653 * exit after we printed their tids. Now the slow paths
654 * skips N extra children, we miss N tasks." (c)
656 * So one need to stop or freeze the leader and all
657 * its children to get a precise result.
659 list_for_each_entry(task
, &start
->children
, sibling
) {
661 pid
= get_pid(task_pid(task
));
667 read_unlock(&tasklist_lock
);
671 static int children_seq_show(struct seq_file
*seq
, void *v
)
673 struct inode
*inode
= seq
->private;
676 pid
= pid_nr_ns(v
, inode
->i_sb
->s_fs_info
);
677 seq_printf(seq
, "%d ", pid
);
682 static void *children_seq_start(struct seq_file
*seq
, loff_t
*pos
)
684 return get_children_pid(seq
->private, NULL
, *pos
);
687 static void *children_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
691 pid
= get_children_pid(seq
->private, v
, *pos
+ 1);
698 static void children_seq_stop(struct seq_file
*seq
, void *v
)
703 static const struct seq_operations children_seq_ops
= {
704 .start
= children_seq_start
,
705 .next
= children_seq_next
,
706 .stop
= children_seq_stop
,
707 .show
= children_seq_show
,
710 static int children_seq_open(struct inode
*inode
, struct file
*file
)
715 ret
= seq_open(file
, &children_seq_ops
);
719 m
= file
->private_data
;
725 int children_seq_release(struct inode
*inode
, struct file
*file
)
727 seq_release(inode
, file
);
731 const struct file_operations proc_tid_children_operations
= {
732 .open
= children_seq_open
,
735 .release
= children_seq_release
,
737 #endif /* CONFIG_PROC_CHILDREN */