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-.\" Copyright (C) Tom Bjorkholm & Markus Kuhn, 1996
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.\" 1996-04-01 Tom Bjorkholm <tomb@mydata.se>
-.\" First version written
-.\" 1996-04-10 Markus Kuhn <mskuhn@cip.informatik.uni-erlangen.de>
-.\" revision
-.\"
-.TH sched_rr_get_interval 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-sched_rr_get_interval \- get the SCHED_RR interval for the named process
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <sched.h>
-.P
-.BI "int sched_rr_get_interval(pid_t " pid ", struct timespec *" tp );
-.fi
-.SH DESCRIPTION
-.BR sched_rr_get_interval ()
-writes into the
-.BR timespec (3)
-structure pointed to by
-.I tp
-the round-robin time quantum for the process identified by
-.IR pid .
-The specified process should be running under the
-.B SCHED_RR
-scheduling policy.
-.P
-If
-.I pid
-is zero, the time quantum for the calling process is written into
-.IR *tp .
-.\" FIXME . On Linux, sched_rr_get_interval()
-.\" returns the timeslice for SCHED_OTHER processes -- this timeslice
-.\" is influenced by the nice value.
-.\" For SCHED_FIFO processes, this always returns 0.
-.\"
-.\" The round-robin time quantum value is not alterable under Linux
-.\" 1.3.81.
-.\"
-.SH RETURN VALUE
-On success,
-.BR sched_rr_get_interval ()
-returns 0.
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EFAULT
-Problem with copying information to user space.
-.TP
-.B EINVAL
-Invalid pid.
-.TP
-.B ENOSYS
-The system call is not yet implemented (only on rather old kernels).
-.TP
-.B ESRCH
-Could not find a process with the ID
-.IR pid .
-.SH VERSIONS
-.SS Linux
-Linux 3.9 added
-.\" commit ce0dbbbb30aee6a835511d5be446462388ba9eee
-a new mechanism for adjusting (and viewing) the
-.B SCHED_RR
-quantum: the
-.I /proc/sys/kernel/sched_rr_timeslice_ms
-file exposes the quantum as a millisecond value, whose default is 100.
-Writing 0 to this file resets the quantum to the default value.
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.SS Linux
-POSIX does not specify any mechanism for controlling the size of the
-round-robin time quantum.
-Older Linux kernels provide a (nonportable) method of doing this.
-The quantum can be controlled by adjusting the process's nice value (see
-.BR setpriority (2)).
-Assigning a negative (i.e., high) nice value results in a longer quantum;
-assigning a positive (i.e., low) nice value results in a shorter quantum.
-The default quantum is 0.1 seconds;
-the degree to which changing the nice value affects the
-quantum has varied somewhat across kernel versions.
-This method of adjusting the quantum was removed
-.\" commit a4ec24b48ddef1e93f7578be53270f0b95ad666c
-starting with Linux 2.6.24.
-.SH NOTES
-POSIX systems on which
-.BR sched_rr_get_interval ()
-is available define
-.B _POSIX_PRIORITY_SCHEDULING
-in
-.IR <unistd.h> .
-.\" .SH BUGS
-.\" As of Linux 1.3.81
-.\" .BR sched_rr_get_interval ()
-.\" returns with error
-.\" ENOSYS, because SCHED_RR has not yet been fully implemented and tested
-.\" properly.
-.SH SEE ALSO
-.BR timespec (3),
-.BR sched (7)