[patch 3/4] c/r: procfs: add arg_start/end, env_start/end and exit_code members to /proc/$pid/stat

[Cyrill Gorcunov]

We would like to have an ability to restore command line
arguments and envirion pointers so the task being restored
would print appropriate values in /proc/pid/cmdline and
/proc/pid/envirion. The exit_code is needed to restore
zombie tasks.

Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Cc: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Andrew Vagin <avagin@xxxxxxxxxx>
Cc: Vasiliy Kulikov <segoon@xxxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
---
 fs/proc/array.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

Index: linux-2.6.git/fs/proc/array.c
===================================================================
--- linux-2.6.git.orig/fs/proc/array.c
+++ linux-2.6.git/fs/proc/array.c
@@ -464,7 +464,8 @@ static int do_task_stat(struct seq_file
 
 	seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
-%lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld %lu %lu %lu\n",
+%lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld %lu %lu %lu \
+%lu %lu %lu %lu %d\n",
 		pid_nr_ns(pid, ns),
 		tcomm,
 		state,
@@ -514,7 +515,12 @@ static int do_task_stat(struct seq_file
 		cputime_to_clock_t(cgtime),
 		(mm && permitted) ? mm->start_data : 0,
 		(mm && permitted) ? mm->end_data : 0,
-		(mm && permitted) ? mm->start_brk : 0);
+		(mm && permitted) ? mm->start_brk : 0,
+		(mm && permitted) ? mm->arg_start : 0,
+		(mm && permitted) ? mm->arg_end : 0,
+		(mm && permitted) ? mm->env_start : 0,
+		(mm && permitted) ? mm->env_end : 0,
+		task->exit_code);
 	if (mm)
 		mmput(mm);
 	return 0;

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