mirror of https://github.com/mkerrisk/man-pages
101 lines
3.0 KiB
Groff
101 lines
3.0 KiB
Groff
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.\" Hey Emacs! This file is -*- nroff -*- source.
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.\"
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.\" Copyright (C) Tom Bjorkholm & Markus Kuhn, 1996
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.\"
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" The GNU General Public License's references to "object code"
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.\" and "executables" are to be interpreted as the output of any
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.\" document formatting or typesetting system, including
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.\" intermediate and printed output.
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.\"
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.\" This manual is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public
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.\" License along with this manual; if not, write to the Free
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.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
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.\" USA.
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.\"
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.\" 1996-04-01 Tom Bjorkholm <tomb@mydata.se>
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.\" First version written
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.\" 1996-04-10 Markus Kuhn <mskuhn@cip.informatik.uni-erlangen.de>
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.\" revision
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.\"
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.TH RR_GET_INTERVAL 2 1996-04-10 "Linux 1.3.81" "Linux Programmer's Manual"
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.SH NAME
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sched_rr_get_interval \- get the SCHED_RR interval for the named process
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.SH SYNOPSIS
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.B #include <sched.h>
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.sp
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\fBint sched_rr_get_interval(pid_t \fIpid\fB, struct timespec *\fItp\fB);
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.sp
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.nf
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.ta 4n 12n 24n
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\fBstruct timespec {
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time_t tv_sec; /* seconds */
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long tv_nsec; /* nanoseconds */
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};
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.ta
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.fi
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.SH DESCRIPTION
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.B sched_rr_get_interval
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writes into the \fItimespec\fR structure pointed to by \fItp\fR the
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round robin time quantum for the process identified by \fIpid\fR. If
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\fIpid\fR is zero, the time quantum for the calling process is written
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into *\fItp\fR. The identified process should be running under the
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.I SCHED_RR
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scheduling policy.
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The round robin time quantum value is not alterable under Linux
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1.3.81.
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POSIX systems on which
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.B sched_rr_get_interval
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is available define
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.I _POSIX_PRIORITY_SCHEDULING
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in <unistd.h>.
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.SH "RETURN VALUE"
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On success,
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.B sched_rr_get_interval
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returns 0.
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On error, \-1 is returned, and
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.I errno
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is set appropriately.
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.SH ERRORS
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.TP
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.B EFAULT
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Problem with copying information to userspace.
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.TP
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.B EINVAL
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Invalid pid.
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.TP
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.B ENOSYS
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The system call is not yet implemented.
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.TP
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.B ESRCH
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The process whose ID is \fIpid\fR could not be found.
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.SH "CONFORMING TO"
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POSIX.1b (formerly POSIX.4)
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.SH BUGS
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As of Linux 1.3.81 \fBsched_rr_get_interval\fR returns with error
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ENOSYS, because SCHED_RR has not yet been fully implemented and tested
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properly.
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.SH "SEE ALSO"
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.BR sched_setscheduler (2)
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has a description of the Linux scheduling scheme.
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.PP
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.I Programming for the real world \- POSIX.4
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by Bill O. Gallmeister, O'Reilly & Associates, Inc., ISBN 1-56592-074-0
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.br
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.I IEEE Std 1003.1b-1993
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(POSIX.1b standard, formerly POSIX.4)
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.br
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.I ISO/IEC 9945-1:1996
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