Commit 5b172087 authored by Cyrill Gorcunov's avatar Cyrill Gorcunov Committed by Linus Torvalds
Browse files

c/r: procfs: add arg_start/end, env_start/end and exit_code members to /proc/$pid/stat 



We would like to have an ability to restore command line arguments and
program environment pointers but first we need to obtain them somehow.
Thus we put these values into /proc/$pid/stat.  The exit_code is needed to
restore zombie tasks.

Signed-off-by: default avatarCyrill Gorcunov <gorcunov@openvz.org>
Acked-by: default avatarKees 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: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andrew Vagin <avagin@openvz.org>
Cc: Vasiliy Kulikov <segoon@openwall.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d97b46a6

Documentation/filesystems/proc.txt

+5 −0
Original line number Diff line number Diff line
@@ -311,6 +311,11 @@ Table 1-4: Contents of the stat files (as of 2.6.30-rc7) 
  start_data    address above which program data+bss is placed

  end_data      address below which program data+bss is placed

  start_brk     address above which program heap can be expanded with brk()

  arg_start     address above which program command line is placed

  arg_end       address below which program command line is placed

  env_start     address above which program environment is placed

  env_end       address below which program environment is placed

  exit_code     the thread's exit_code in the form reported by the waitpid system call

..............................................................................



The /proc/PID/maps file containing the currently mapped memory regions and

fs/proc/array.c

+17 −3
Original line number Diff line number Diff line
@@ -517,9 +517,23 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 
	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));

	seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->start_data : 0);

	seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->end_data : 0);

	seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->start_brk : 0);



	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);

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