![Iago López Galeiras](/assets/img/avatar_default.png)
Commit 818411616b
("fs, proc: introduce /proc/<pid>/task/<tid>/children
entry") introduced the children entry for checkpoint restore and the
file is only available on kernels configured with CONFIG_EXPERT and
CONFIG_CHECKPOINT_RESTORE.
This is available in most distributions (Fedora, Debian, Ubuntu, CoreOS)
because they usually enable CONFIG_EXPERT and CONFIG_CHECKPOINT_RESTORE.
But Arch does not enable CONFIG_EXPERT or CONFIG_CHECKPOINT_RESTORE.
However, the children proc file is useful outside of checkpoint restore.
I would like to use it in rkt. The rkt process exec() another program
it does not control, and that other program will fork()+exec() a child
process. I would like to find the pid of the child process from an
external tool without iterating in /proc over all processes to find
which one has a parent pid equal to rkt.
This commit introduces CONFIG_PROC_CHILDREN and makes
CONFIG_CHECKPOINT_RESTORE select it. This allows enabling
/proc/<pid>/task/<tid>/children without needing to enable
CONFIG_CHECKPOINT_RESTORE and CONFIG_EXPERT.
Alban tested that /proc/<pid>/task/<tid>/children is present when the
kernel is configured with CONFIG_PROC_CHILDREN=y but without
CONFIG_CHECKPOINT_RESTORE
Signed-off-by: Iago López Galeiras <iago@endocode.com>
Tested-by: Alban Crequy <alban@endocode.com>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Serge Hallyn <serge.hallyn@canonical.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Djalal Harouni <djalal@endocode.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
704 lines
18 KiB
C
704 lines
18 KiB
C
/*
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* linux/fs/proc/array.c
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*
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* Copyright (C) 1992 by Linus Torvalds
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* based on ideas by Darren Senn
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*
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* Fixes:
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* Michael. K. Johnson: stat,statm extensions.
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* <johnsonm@stolaf.edu>
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*
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* Pauline Middelink : Made cmdline,envline only break at '\0's, to
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* make sure SET_PROCTITLE works. Also removed
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* bad '!' which forced address recalculation for
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* EVERY character on the current page.
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* <middelin@polyware.iaf.nl>
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*
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* Danny ter Haar : added cpuinfo
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* <dth@cistron.nl>
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*
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* Alessandro Rubini : profile extension.
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* <rubini@ipvvis.unipv.it>
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*
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* Jeff Tranter : added BogoMips field to cpuinfo
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* <Jeff_Tranter@Mitel.COM>
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*
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* Bruno Haible : remove 4K limit for the maps file
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* <haible@ma2s2.mathematik.uni-karlsruhe.de>
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*
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* Yves Arrouye : remove removal of trailing spaces in get_array.
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* <Yves.Arrouye@marin.fdn.fr>
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*
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* Jerome Forissier : added per-CPU time information to /proc/stat
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* and /proc/<pid>/cpu extension
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* <forissier@isia.cma.fr>
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* - Incorporation and non-SMP safe operation
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* of forissier patch in 2.1.78 by
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* Hans Marcus <crowbar@concepts.nl>
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*
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* aeb@cwi.nl : /proc/partitions
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*
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*
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* Alan Cox : security fixes.
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* <alan@lxorguk.ukuu.org.uk>
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*
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* Al Viro : safe handling of mm_struct
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*
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* Gerhard Wichert : added BIGMEM support
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* Siemens AG <Gerhard.Wichert@pdb.siemens.de>
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*
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* Al Viro & Jeff Garzik : moved most of the thing into base.c and
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* : proc_misc.c. The rest may eventually go into
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* : base.c too.
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <linux/kernel.h>
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#include <linux/kernel_stat.h>
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#include <linux/tty.h>
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#include <linux/string.h>
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#include <linux/mman.h>
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#include <linux/proc_fs.h>
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#include <linux/ioport.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <linux/mm.h>
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#include <linux/hugetlb.h>
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#include <linux/pagemap.h>
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#include <linux/swap.h>
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#include <linux/smp.h>
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#include <linux/signal.h>
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#include <linux/highmem.h>
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#include <linux/file.h>
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#include <linux/fdtable.h>
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#include <linux/times.h>
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#include <linux/cpuset.h>
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#include <linux/rcupdate.h>
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#include <linux/delayacct.h>
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#include <linux/seq_file.h>
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#include <linux/pid_namespace.h>
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#include <linux/ptrace.h>
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#include <linux/tracehook.h>
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#include <linux/string_helpers.h>
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#include <linux/user_namespace.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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#include "internal.h"
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static inline void task_name(struct seq_file *m, struct task_struct *p)
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{
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char *buf;
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char tcomm[sizeof(p->comm)];
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get_task_comm(tcomm, p);
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seq_puts(m, "Name:\t");
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buf = m->buf + m->count;
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/* Ignore error for now */
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buf += string_escape_str(tcomm, buf, m->size - m->count,
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ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
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m->count = buf - m->buf;
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seq_putc(m, '\n');
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}
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/*
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* The task state array is a strange "bitmap" of
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* reasons to sleep. Thus "running" is zero, and
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* you can test for combinations of others with
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* simple bit tests.
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*/
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static const char * const task_state_array[] = {
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"R (running)", /* 0 */
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"S (sleeping)", /* 1 */
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"D (disk sleep)", /* 2 */
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"T (stopped)", /* 4 */
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"t (tracing stop)", /* 8 */
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"X (dead)", /* 16 */
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"Z (zombie)", /* 32 */
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};
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static inline const char *get_task_state(struct task_struct *tsk)
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{
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unsigned int state = (tsk->state | tsk->exit_state) & TASK_REPORT;
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/*
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* Parked tasks do not run; they sit in __kthread_parkme().
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* Without this check, we would report them as running, which is
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* clearly wrong, so we report them as sleeping instead.
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*/
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if (tsk->state == TASK_PARKED)
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state = TASK_INTERRUPTIBLE;
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BUILD_BUG_ON(1 + ilog2(TASK_REPORT) != ARRAY_SIZE(task_state_array)-1);
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return task_state_array[fls(state)];
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}
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static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
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struct pid *pid, struct task_struct *p)
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{
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struct user_namespace *user_ns = seq_user_ns(m);
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struct group_info *group_info;
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int g;
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struct task_struct *tracer;
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const struct cred *cred;
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pid_t ppid, tpid = 0, tgid, ngid;
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unsigned int max_fds = 0;
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rcu_read_lock();
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ppid = pid_alive(p) ?
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task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
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tracer = ptrace_parent(p);
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if (tracer)
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tpid = task_pid_nr_ns(tracer, ns);
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tgid = task_tgid_nr_ns(p, ns);
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ngid = task_numa_group_id(p);
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cred = get_task_cred(p);
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task_lock(p);
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if (p->files)
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max_fds = files_fdtable(p->files)->max_fds;
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task_unlock(p);
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rcu_read_unlock();
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seq_printf(m,
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"State:\t%s\n"
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"Tgid:\t%d\n"
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"Ngid:\t%d\n"
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"Pid:\t%d\n"
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"PPid:\t%d\n"
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"TracerPid:\t%d\n"
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"Uid:\t%d\t%d\t%d\t%d\n"
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"Gid:\t%d\t%d\t%d\t%d\n"
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"FDSize:\t%d\nGroups:\t",
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get_task_state(p),
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tgid, ngid, pid_nr_ns(pid, ns), ppid, tpid,
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from_kuid_munged(user_ns, cred->uid),
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from_kuid_munged(user_ns, cred->euid),
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from_kuid_munged(user_ns, cred->suid),
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from_kuid_munged(user_ns, cred->fsuid),
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from_kgid_munged(user_ns, cred->gid),
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from_kgid_munged(user_ns, cred->egid),
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from_kgid_munged(user_ns, cred->sgid),
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from_kgid_munged(user_ns, cred->fsgid),
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max_fds);
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group_info = cred->group_info;
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for (g = 0; g < group_info->ngroups; g++)
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seq_printf(m, "%d ",
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from_kgid_munged(user_ns, GROUP_AT(group_info, g)));
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put_cred(cred);
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#ifdef CONFIG_PID_NS
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seq_puts(m, "\nNStgid:");
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for (g = ns->level; g <= pid->level; g++)
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seq_printf(m, "\t%d",
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task_tgid_nr_ns(p, pid->numbers[g].ns));
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seq_puts(m, "\nNSpid:");
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for (g = ns->level; g <= pid->level; g++)
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seq_printf(m, "\t%d",
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task_pid_nr_ns(p, pid->numbers[g].ns));
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seq_puts(m, "\nNSpgid:");
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for (g = ns->level; g <= pid->level; g++)
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seq_printf(m, "\t%d",
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task_pgrp_nr_ns(p, pid->numbers[g].ns));
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seq_puts(m, "\nNSsid:");
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for (g = ns->level; g <= pid->level; g++)
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seq_printf(m, "\t%d",
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task_session_nr_ns(p, pid->numbers[g].ns));
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#endif
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seq_putc(m, '\n');
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}
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void render_sigset_t(struct seq_file *m, const char *header,
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sigset_t *set)
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{
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int i;
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seq_puts(m, header);
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i = _NSIG;
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do {
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int x = 0;
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i -= 4;
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if (sigismember(set, i+1)) x |= 1;
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if (sigismember(set, i+2)) x |= 2;
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if (sigismember(set, i+3)) x |= 4;
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if (sigismember(set, i+4)) x |= 8;
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seq_printf(m, "%x", x);
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} while (i >= 4);
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seq_putc(m, '\n');
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}
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static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
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sigset_t *catch)
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{
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struct k_sigaction *k;
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int i;
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k = p->sighand->action;
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for (i = 1; i <= _NSIG; ++i, ++k) {
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if (k->sa.sa_handler == SIG_IGN)
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sigaddset(ign, i);
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else if (k->sa.sa_handler != SIG_DFL)
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sigaddset(catch, i);
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}
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}
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static inline void task_sig(struct seq_file *m, struct task_struct *p)
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{
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unsigned long flags;
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sigset_t pending, shpending, blocked, ignored, caught;
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int num_threads = 0;
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unsigned long qsize = 0;
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unsigned long qlim = 0;
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sigemptyset(&pending);
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sigemptyset(&shpending);
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sigemptyset(&blocked);
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sigemptyset(&ignored);
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sigemptyset(&caught);
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if (lock_task_sighand(p, &flags)) {
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pending = p->pending.signal;
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shpending = p->signal->shared_pending.signal;
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blocked = p->blocked;
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collect_sigign_sigcatch(p, &ignored, &caught);
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num_threads = get_nr_threads(p);
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rcu_read_lock(); /* FIXME: is this correct? */
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qsize = atomic_read(&__task_cred(p)->user->sigpending);
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rcu_read_unlock();
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qlim = task_rlimit(p, RLIMIT_SIGPENDING);
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unlock_task_sighand(p, &flags);
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}
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seq_printf(m, "Threads:\t%d\n", num_threads);
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seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
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/* render them all */
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render_sigset_t(m, "SigPnd:\t", &pending);
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render_sigset_t(m, "ShdPnd:\t", &shpending);
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render_sigset_t(m, "SigBlk:\t", &blocked);
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render_sigset_t(m, "SigIgn:\t", &ignored);
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render_sigset_t(m, "SigCgt:\t", &caught);
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}
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static void render_cap_t(struct seq_file *m, const char *header,
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kernel_cap_t *a)
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{
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unsigned __capi;
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seq_puts(m, header);
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CAP_FOR_EACH_U32(__capi) {
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seq_printf(m, "%08x",
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a->cap[CAP_LAST_U32 - __capi]);
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}
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seq_putc(m, '\n');
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}
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static inline void task_cap(struct seq_file *m, struct task_struct *p)
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{
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const struct cred *cred;
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kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
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rcu_read_lock();
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cred = __task_cred(p);
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cap_inheritable = cred->cap_inheritable;
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cap_permitted = cred->cap_permitted;
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cap_effective = cred->cap_effective;
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cap_bset = cred->cap_bset;
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rcu_read_unlock();
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render_cap_t(m, "CapInh:\t", &cap_inheritable);
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render_cap_t(m, "CapPrm:\t", &cap_permitted);
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render_cap_t(m, "CapEff:\t", &cap_effective);
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render_cap_t(m, "CapBnd:\t", &cap_bset);
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}
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static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
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{
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#ifdef CONFIG_SECCOMP
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seq_printf(m, "Seccomp:\t%d\n", p->seccomp.mode);
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#endif
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}
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static inline void task_context_switch_counts(struct seq_file *m,
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struct task_struct *p)
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{
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seq_printf(m, "voluntary_ctxt_switches:\t%lu\n"
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"nonvoluntary_ctxt_switches:\t%lu\n",
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p->nvcsw,
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p->nivcsw);
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}
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static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
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{
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seq_printf(m, "Cpus_allowed:\t%*pb\n",
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cpumask_pr_args(&task->cpus_allowed));
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seq_printf(m, "Cpus_allowed_list:\t%*pbl\n",
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cpumask_pr_args(&task->cpus_allowed));
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}
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int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
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struct pid *pid, struct task_struct *task)
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{
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struct mm_struct *mm = get_task_mm(task);
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task_name(m, task);
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task_state(m, ns, pid, task);
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if (mm) {
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task_mem(m, mm);
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mmput(mm);
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}
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task_sig(m, task);
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task_cap(m, task);
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task_seccomp(m, task);
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task_cpus_allowed(m, task);
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cpuset_task_status_allowed(m, task);
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task_context_switch_counts(m, task);
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return 0;
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}
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static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
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struct pid *pid, struct task_struct *task, int whole)
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{
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unsigned long vsize, eip, esp, wchan = ~0UL;
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int priority, nice;
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int tty_pgrp = -1, tty_nr = 0;
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sigset_t sigign, sigcatch;
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char state;
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pid_t ppid = 0, pgid = -1, sid = -1;
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int num_threads = 0;
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int permitted;
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struct mm_struct *mm;
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unsigned long long start_time;
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unsigned long cmin_flt = 0, cmaj_flt = 0;
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unsigned long min_flt = 0, maj_flt = 0;
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cputime_t cutime, cstime, utime, stime;
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cputime_t cgtime, gtime;
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unsigned long rsslim = 0;
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char tcomm[sizeof(task->comm)];
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unsigned long flags;
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state = *get_task_state(task);
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vsize = eip = esp = 0;
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permitted = ptrace_may_access(task, PTRACE_MODE_READ | PTRACE_MODE_NOAUDIT);
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mm = get_task_mm(task);
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if (mm) {
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vsize = task_vsize(mm);
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if (permitted) {
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eip = KSTK_EIP(task);
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esp = KSTK_ESP(task);
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}
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}
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get_task_comm(tcomm, task);
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sigemptyset(&sigign);
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sigemptyset(&sigcatch);
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cutime = cstime = utime = stime = 0;
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cgtime = gtime = 0;
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if (lock_task_sighand(task, &flags)) {
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struct signal_struct *sig = task->signal;
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if (sig->tty) {
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struct pid *pgrp = tty_get_pgrp(sig->tty);
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tty_pgrp = pid_nr_ns(pgrp, ns);
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put_pid(pgrp);
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tty_nr = new_encode_dev(tty_devnum(sig->tty));
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}
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num_threads = get_nr_threads(task);
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collect_sigign_sigcatch(task, &sigign, &sigcatch);
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cmin_flt = sig->cmin_flt;
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cmaj_flt = sig->cmaj_flt;
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cutime = sig->cutime;
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cstime = sig->cstime;
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cgtime = sig->cgtime;
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rsslim = ACCESS_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
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/* add up live thread stats at the group level */
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if (whole) {
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struct task_struct *t = task;
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do {
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min_flt += t->min_flt;
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maj_flt += t->maj_flt;
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gtime += task_gtime(t);
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} while_each_thread(task, t);
|
|
|
|
min_flt += sig->min_flt;
|
|
maj_flt += sig->maj_flt;
|
|
thread_group_cputime_adjusted(task, &utime, &stime);
|
|
gtime += sig->gtime;
|
|
}
|
|
|
|
sid = task_session_nr_ns(task, ns);
|
|
ppid = task_tgid_nr_ns(task->real_parent, ns);
|
|
pgid = task_pgrp_nr_ns(task, ns);
|
|
|
|
unlock_task_sighand(task, &flags);
|
|
}
|
|
|
|
if (permitted && (!whole || num_threads < 2))
|
|
wchan = get_wchan(task);
|
|
if (!whole) {
|
|
min_flt = task->min_flt;
|
|
maj_flt = task->maj_flt;
|
|
task_cputime_adjusted(task, &utime, &stime);
|
|
gtime = task_gtime(task);
|
|
}
|
|
|
|
/* scale priority and nice values from timeslices to -20..20 */
|
|
/* to make it look like a "normal" Unix priority/nice value */
|
|
priority = task_prio(task);
|
|
nice = task_nice(task);
|
|
|
|
/* convert nsec -> ticks */
|
|
start_time = nsec_to_clock_t(task->real_start_time);
|
|
|
|
seq_printf(m, "%d (%s) %c", pid_nr_ns(pid, ns), tcomm, state);
|
|
seq_put_decimal_ll(m, ' ', ppid);
|
|
seq_put_decimal_ll(m, ' ', pgid);
|
|
seq_put_decimal_ll(m, ' ', sid);
|
|
seq_put_decimal_ll(m, ' ', tty_nr);
|
|
seq_put_decimal_ll(m, ' ', tty_pgrp);
|
|
seq_put_decimal_ull(m, ' ', task->flags);
|
|
seq_put_decimal_ull(m, ' ', min_flt);
|
|
seq_put_decimal_ull(m, ' ', cmin_flt);
|
|
seq_put_decimal_ull(m, ' ', maj_flt);
|
|
seq_put_decimal_ull(m, ' ', cmaj_flt);
|
|
seq_put_decimal_ull(m, ' ', cputime_to_clock_t(utime));
|
|
seq_put_decimal_ull(m, ' ', cputime_to_clock_t(stime));
|
|
seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cutime));
|
|
seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cstime));
|
|
seq_put_decimal_ll(m, ' ', priority);
|
|
seq_put_decimal_ll(m, ' ', nice);
|
|
seq_put_decimal_ll(m, ' ', num_threads);
|
|
seq_put_decimal_ull(m, ' ', 0);
|
|
seq_put_decimal_ull(m, ' ', start_time);
|
|
seq_put_decimal_ull(m, ' ', vsize);
|
|
seq_put_decimal_ull(m, ' ', mm ? get_mm_rss(mm) : 0);
|
|
seq_put_decimal_ull(m, ' ', rsslim);
|
|
seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->start_code : 1) : 0);
|
|
seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->end_code : 1) : 0);
|
|
seq_put_decimal_ull(m, ' ', (permitted && mm) ? mm->start_stack : 0);
|
|
seq_put_decimal_ull(m, ' ', esp);
|
|
seq_put_decimal_ull(m, ' ', eip);
|
|
/* The signal information here is obsolete.
|
|
* It must be decimal for Linux 2.0 compatibility.
|
|
* Use /proc/#/status for real-time signals.
|
|
*/
|
|
seq_put_decimal_ull(m, ' ', task->pending.signal.sig[0] & 0x7fffffffUL);
|
|
seq_put_decimal_ull(m, ' ', task->blocked.sig[0] & 0x7fffffffUL);
|
|
seq_put_decimal_ull(m, ' ', sigign.sig[0] & 0x7fffffffUL);
|
|
seq_put_decimal_ull(m, ' ', sigcatch.sig[0] & 0x7fffffffUL);
|
|
seq_put_decimal_ull(m, ' ', wchan);
|
|
seq_put_decimal_ull(m, ' ', 0);
|
|
seq_put_decimal_ull(m, ' ', 0);
|
|
seq_put_decimal_ll(m, ' ', task->exit_signal);
|
|
seq_put_decimal_ll(m, ' ', task_cpu(task));
|
|
seq_put_decimal_ull(m, ' ', task->rt_priority);
|
|
seq_put_decimal_ull(m, ' ', task->policy);
|
|
seq_put_decimal_ull(m, ' ', delayacct_blkio_ticks(task));
|
|
seq_put_decimal_ull(m, ' ', cputime_to_clock_t(gtime));
|
|
seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cgtime));
|
|
|
|
if (mm && permitted) {
|
|
seq_put_decimal_ull(m, ' ', mm->start_data);
|
|
seq_put_decimal_ull(m, ' ', mm->end_data);
|
|
seq_put_decimal_ull(m, ' ', mm->start_brk);
|
|
seq_put_decimal_ull(m, ' ', mm->arg_start);
|
|
seq_put_decimal_ull(m, ' ', mm->arg_end);
|
|
seq_put_decimal_ull(m, ' ', mm->env_start);
|
|
seq_put_decimal_ull(m, ' ', mm->env_end);
|
|
} else
|
|
seq_printf(m, " 0 0 0 0 0 0 0");
|
|
|
|
if (permitted)
|
|
seq_put_decimal_ll(m, ' ', task->exit_code);
|
|
else
|
|
seq_put_decimal_ll(m, ' ', 0);
|
|
|
|
seq_putc(m, '\n');
|
|
if (mm)
|
|
mmput(mm);
|
|
return 0;
|
|
}
|
|
|
|
int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
return do_task_stat(m, ns, pid, task, 0);
|
|
}
|
|
|
|
int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
return do_task_stat(m, ns, pid, task, 1);
|
|
}
|
|
|
|
int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0;
|
|
struct mm_struct *mm = get_task_mm(task);
|
|
|
|
if (mm) {
|
|
size = task_statm(mm, &shared, &text, &data, &resident);
|
|
mmput(mm);
|
|
}
|
|
/*
|
|
* For quick read, open code by putting numbers directly
|
|
* expected format is
|
|
* seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
|
|
* size, resident, shared, text, data);
|
|
*/
|
|
seq_put_decimal_ull(m, 0, size);
|
|
seq_put_decimal_ull(m, ' ', resident);
|
|
seq_put_decimal_ull(m, ' ', shared);
|
|
seq_put_decimal_ull(m, ' ', text);
|
|
seq_put_decimal_ull(m, ' ', 0);
|
|
seq_put_decimal_ull(m, ' ', data);
|
|
seq_put_decimal_ull(m, ' ', 0);
|
|
seq_putc(m, '\n');
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_CHILDREN
|
|
static struct pid *
|
|
get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
|
|
{
|
|
struct task_struct *start, *task;
|
|
struct pid *pid = NULL;
|
|
|
|
read_lock(&tasklist_lock);
|
|
|
|
start = pid_task(proc_pid(inode), PIDTYPE_PID);
|
|
if (!start)
|
|
goto out;
|
|
|
|
/*
|
|
* Lets try to continue searching first, this gives
|
|
* us significant speedup on children-rich processes.
|
|
*/
|
|
if (pid_prev) {
|
|
task = pid_task(pid_prev, PIDTYPE_PID);
|
|
if (task && task->real_parent == start &&
|
|
!(list_empty(&task->sibling))) {
|
|
if (list_is_last(&task->sibling, &start->children))
|
|
goto out;
|
|
task = list_first_entry(&task->sibling,
|
|
struct task_struct, sibling);
|
|
pid = get_pid(task_pid(task));
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Slow search case.
|
|
*
|
|
* We might miss some children here if children
|
|
* are exited while we were not holding the lock,
|
|
* but it was never promised to be accurate that
|
|
* much.
|
|
*
|
|
* "Just suppose that the parent sleeps, but N children
|
|
* exit after we printed their tids. Now the slow paths
|
|
* skips N extra children, we miss N tasks." (c)
|
|
*
|
|
* So one need to stop or freeze the leader and all
|
|
* its children to get a precise result.
|
|
*/
|
|
list_for_each_entry(task, &start->children, sibling) {
|
|
if (pos-- == 0) {
|
|
pid = get_pid(task_pid(task));
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
read_unlock(&tasklist_lock);
|
|
return pid;
|
|
}
|
|
|
|
static int children_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct inode *inode = seq->private;
|
|
pid_t pid;
|
|
|
|
pid = pid_nr_ns(v, inode->i_sb->s_fs_info);
|
|
seq_printf(seq, "%d ", pid);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void *children_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
return get_children_pid(seq->private, NULL, *pos);
|
|
}
|
|
|
|
static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct pid *pid;
|
|
|
|
pid = get_children_pid(seq->private, v, *pos + 1);
|
|
put_pid(v);
|
|
|
|
++*pos;
|
|
return pid;
|
|
}
|
|
|
|
static void children_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
put_pid(v);
|
|
}
|
|
|
|
static const struct seq_operations children_seq_ops = {
|
|
.start = children_seq_start,
|
|
.next = children_seq_next,
|
|
.stop = children_seq_stop,
|
|
.show = children_seq_show,
|
|
};
|
|
|
|
static int children_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *m;
|
|
int ret;
|
|
|
|
ret = seq_open(file, &children_seq_ops);
|
|
if (ret)
|
|
return ret;
|
|
|
|
m = file->private_data;
|
|
m->private = inode;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int children_seq_release(struct inode *inode, struct file *file)
|
|
{
|
|
seq_release(inode, file);
|
|
return 0;
|
|
}
|
|
|
|
const struct file_operations proc_tid_children_operations = {
|
|
.open = children_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = children_seq_release,
|
|
};
|
|
#endif /* CONFIG_PROC_CHILDREN */
|