System uptime implementation

[giampaolo]

From [email protected] on March 17, 2009 01:55:23

In issue 33 we decided that PID 0's create_time must be equal to system uptime.
I'm opening this report to keep track of our progresses about system uptime
implementation on all platforms.

system uptime has been currently implemented on Windows and Linux platforms
as r257 .
OS X and FreeBSD implementations are still missing as well as any potential
test case.

Original issue: http://code.google.com/p/psutil/issues/detail?id=39

[giampaolo]

From [email protected] on March 16, 2009 17:55:49

Summary: System uptime implementation

[giampaolo]

From [email protected] on March 16, 2009 17:56:07

Blockedon: 33

[giampaolo]

From [email protected] on March 16, 2009 18:18:33

Implemented on FreeBSD as r266 .

[giampaolo]

From [email protected] on March 16, 2009 19:02:45

Added test case for FreeBSD as r267 .

[giampaolo]

From [email protected] on March 17, 2009 06:28:54

OS X support added in r268

Status: Started

[giampaolo]

From [email protected] on March 17, 2009 07:00:27

Could you please verify if this test works also on OS X?


        # test PID 0 special case where create_time is supposed to be
        # equal to system uptime
        # XXX - does this work also on OS X?
        if sys.platform.lower().startswith("freebsd"):
            sp = subprocess.Popen(["sysctl", "-x", "kern.boottime"],
                                  stdout=subprocess.PIPE)
            output = sp.communicate()[0]
            uptime = output[output.find('= ') + 2:].split(',')[0]
            self.assertEqual(int(p.create_time), int(uptime))

[giampaolo]

From [email protected] on March 17, 2009 08:29:37

I can't test that on OS X until create_time is implemented for OS X. That being said,
the sysctl command line on OS X doesn't have a -x option. You probably want: 

    [user@host ]$ sysctl -bn kern.boottime
    1236101236

Which provides the boot time in epoch time.

[giampaolo]

From [email protected] on March 17, 2009 09:18:48

Labels: Progress-3in4

[giampaolo]

From [email protected] on March 20, 2009 13:47:00

Turns out there's no need to check the system uptime against PID 0's start time on OS
X, since the start time is provided for all PIDs from syctl()

[giampaolo]

From [email protected] on March 20, 2009 14:15:37

Implemented everywhere and not needed for PID 0 on FreeBSD either

Status: Fixed
Labels: -Progress-3in4

[giampaolo]

From g.rodola on March 02, 2013 03:47:32

Updated csets after the SVN -> Mercurial migration: r257 == revision 
442aee762cf4 r266 == revision f910f2f333cc r267 == revision 632fae566b94 r268 == revision 9f3b05351fd7