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From: Po Lu via GNU coreutils Bug Reports <bug-coreutils@gnu.org>
To: Bruno Haible <bruno@clisp.org>
Cc: "Paul Eggert" <eggert@cs.ucla.edu>,
	bug-gnulib@gnu.org, "Thorsten Kukuk" <kukuk@suse.com>,
	"Robert Pluim" <rpluim@gmail.com>,
	Emacs-devel@gnu.org, "Natanael Copa" <natanael.copa@gmail.com>,
	"Pádraig Brady" <P@draigbrady.com>,
	"Sven Joachim" <svenjoac@gmx.de>,
	64937@debbugs.gnu.org
Subject: bug#64937: boot time on Linux
Date: Thu, 10 Aug 2023 20:23:34 +0800	[thread overview]
Message-ID: <87cyzvrsqh.fsf@yahoo.com> (raw)
In-Reply-To: <5521870.8Rdponrqg9@nimes> (Bruno Haible's message of "Thu, 10 Aug 2023 12:30:26 +0200")

Bruno Haible <bruno@clisp.org> writes:

> I wrote:
>> > No, it isn't. The attached file, when compiled and run under Termux (which
>> > doesn't have particular permissions), prints e.g.:
>> >
>> > from clock  : 1691616762.476870660 = 2023-08-09 21:32:42.476870660
>> > from sysinfo: 1691616762.329261637 = 2023-08-09 21:32:42.329261637
>> >
>> > Note that this uses the kernel's uptime counter, so it will not work well
>> > when the user changes the current time manually. But this is rare on Android.
>
> It works well enough, that I'm adding it to Gnulib, through the attached patch.
>
> Po Lu wrote:
>> This uses the uptime counter (which also results in an SELinux denial
>> for me, but different Android distributions have SELinux policies of
>> varying strictness)
>
> How did you run the program, and which of the two calls (clock_gettime, sysinfo)
> failed for you? Maybe it depends not only on the Android version and device,
> but also on the permissions required by the app?

Both clock_gettime (CLOCK_BOOTIME, ... sysinfo fail with AVC denial
errors and errno set to EACCESS.

I think it is a bit of a stretch to ascribe this to an app's requested
permissions, though, since none of the listed permissions available to
user programs seems pertinent.





  reply	other threads:[~2023-08-10 12:23 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <87tttmpt5h.fsf@turtle.gmx.de>
     [not found] ` <20230808173430.GA27131@suse.com>
     [not found]   ` <26226778.6c9BZvbsD2@nimes>
     [not found]     ` <3732835.vtg8X0x55z@nimes>
2023-08-09 19:31       ` boot time on Linux Paul Eggert
2023-08-09 21:06         ` Bruno Haible
2023-08-09 23:53         ` Po Lu
2023-08-10  0:14           ` Bruno Haible
2023-08-10  2:14             ` Po Lu
2023-08-10  6:22               ` Paul Eggert
2023-08-10  6:58                 ` Po Lu
2023-08-10 10:30               ` Bruno Haible
2023-08-10 12:23                 ` Po Lu via GNU coreutils Bug Reports [this message]
2023-08-10 12:25                   ` Bruno Haible
2023-08-10 13:04                     ` Po Lu
2023-08-10 14:12                       ` Bruno Haible
2023-08-11  8:27                         ` Po Lu
2023-08-10  9:30         ` Natanael Copa
2023-08-10  9:38           ` Po Lu
2023-08-10 10:05             ` Natanael Copa
2023-08-10 15:30           ` Bruno Haible

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