linux-kernel - [RFC] [PATCH procfs] Add process age

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <1279907271.4335.3.camel@cowboy>
Date:	Fri, 23 Jul 2010 13:47:51 -0400
From:	Davidlohr Bueso <dave.bueso@...il.com>
To:	torvalds@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [RFC] [PATCH procfs] Add process age

Hi,

This patch exports a process's age, in seconds, adding a /proc/#/age file.

Thanks,
Davidlohr

Signed-off-by: Davidlohr Bueso <dave@....org>
---
 fs/proc/base.c |   19 ++++++++++++++++++-
 1 files changed, 18 insertions(+), 1 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index acb7ef8..a5a4832 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -38,13 +38,16 @@
  *  ChangeLog:
  *  10-Mar-2005
  *  10LE Instituto Nokia de Tecnologia - INdT:
- *  A better way to walks through the page table as suggested by Hugh Dickins.
+ *  A better way to walk through the page table as suggested by Hugh Dickins.
  *
  *  Simo Piiroinen <simo.piiroinen@...ia.com>:
  *  Smaps information related to shared, private, clean and dirty pages.
  *
  *  Paul Mundt <paul.mundt@...ia.com>:
  *  Overall revision about smaps.
+ *
+ *  2010 - Davidlohr Bueso <dave@....org>:
+ *  Added process age (/proc/#/age), in seconds.
  */
 
 #include <asm/uaccess.h>
@@ -2558,6 +2561,18 @@ static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
 	return 0;
 }
 
+static int proc_pid_age(struct seq_file *m, struct pid_namespace *ns,
+			struct pid *pid, struct task_struct *task)
+{
+	struct timespec uptime;
+
+	do_posix_clock_monotonic_gettime(&uptime);
+	monotonic_to_bootbased(&uptime);
+	seq_printf(m, "%lu\n", uptime.tv_sec - task->real_start_time.tv_sec);
+
+	return 0;
+}
+
 /*
  * Thread groups
  */
@@ -2575,6 +2590,7 @@ static const struct pid_entry tgid_base_stuff[] = {
 	INF("auxv",       S_IRUSR, proc_pid_auxv),
 	ONE("status",     S_IRUGO, proc_pid_status),
 	ONE("personality", S_IRUSR, proc_pid_personality),
+	ONE("age",        S_IRUSR, proc_pid_age),
 	INF("limits",	  S_IRUSR, proc_pid_limits),
 #ifdef CONFIG_SCHED_DEBUG
 	REG("sched",      S_IRUGO|S_IWUSR, proc_pid_sched_operations),
@@ -2910,6 +2926,7 @@ static const struct pid_entry tid_base_stuff[] = {
 	INF("auxv",      S_IRUSR, proc_pid_auxv),
 	ONE("status",    S_IRUGO, proc_pid_status),
 	ONE("personality", S_IRUSR, proc_pid_personality),
+	ONE("age",        S_IRUSR, proc_pid_age),
 	INF("limits",	 S_IRUSR, proc_pid_limits),
 #ifdef CONFIG_SCHED_DEBUG
 	REG("sched",     S_IRUGO|S_IWUSR, proc_pid_sched_operations),
-- 
1.7.0.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/