projects / thirdparty / man-pages.git / blame
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1 | .\" Copyright (C) 1994, 1995, Daniel Quinlan <quinlan@yggdrasil.com> |
| 2 | .\" Copyright (C) 2002-2008, 2017, Michael Kerrisk <mtk.manpages@gmail.com> | |
| 3 | .\" Copyright (C) 2023, Alejandro Colomar <alx@kernel.org> | |
| 4 | .\" | |
| 5 | .\" SPDX-License-Identifier: GPL-3.0-or-later | |
| 6 | .\" | |
| 7 | .TH proc_pid_timerslack_ns 5 (date) "Linux man-pages (unreleased)" | |
| 8 | .SH NAME | |
| 9 | /proc/pid/timerslack_ns \- timer slack in nanoseconds | |
| 10 | .SH DESCRIPTION | |
| 11 | .TP | |
| 12 | .IR /proc/ pid /timerslack_ns " (since Linux 4.6)" | |
| 13 | .\" commit da8b44d5a9f8bf26da637b7336508ca534d6b319 | |
| 14 | .\" commit 5de23d435e88996b1efe0e2cebe242074ce67c9e | |
| 15 | This file exposes the process's "current" timer slack value, | |
| 16 | expressed in nanoseconds. | |
| 17 | The file is writable, | |
| 18 | allowing the process's timer slack value to be changed. | |
| 19 | Writing 0 to this file resets the "current" timer slack to the | |
| 20 | "default" timer slack value. | |
| 21 | For further details, see the discussion of | |
| 22 | .B PR_SET_TIMERSLACK | |
| 23 | in | |
| 24 | .BR prctl (2). | |
| 25 | .IP | |
| 26 | Initially, | |
| 27 | permission to access this file was governed by a ptrace access mode | |
| 28 | .B PTRACE_MODE_ATTACH_FSCREDS | |
| 29 | check (see | |
| 30 | .BR ptrace (2)). | |
| 31 | However, this was subsequently deemed too strict a requirement | |
| 32 | (and had the side effect that requiring a process to have the | |
| 33 | .B CAP_SYS_PTRACE | |
| 34 | capability would also allow it to view and change any process's memory). | |
| 35 | Therefore, since Linux 4.9, | |
| 36 | .\" commit 7abbaf94049914f074306d960b0f968ffe52e59f | |
| 37 | only the (weaker) | |
| 38 | .B CAP_SYS_NICE | |
| 39 | capability is required to access this file. | |
| 40 | .SH SEE ALSO | |
| 41 | .BR proc (5) |