2004-11-03 13:51:07 +00:00
|
|
|
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
|
2007-06-20 22:33:04 +00:00
|
|
|
.TH "SCHED_GETSCHEDULER" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
|
2004-11-03 13:51:07 +00:00
|
|
|
.\" sched_getscheduler
|
2007-09-20 06:03:25 +00:00
|
|
|
.SH PROLOG
|
|
|
|
This manual page is part of the POSIX Programmer's Manual.
|
|
|
|
The Linux implementation of this interface may differ (consult
|
|
|
|
the corresponding Linux manual page for details of Linux behavior),
|
|
|
|
or the interface may not be implemented on Linux.
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH NAME
|
|
|
|
sched_getscheduler \- get scheduling policy (\fBREALTIME\fP)
|
|
|
|
.SH SYNOPSIS
|
|
|
|
.LP
|
|
|
|
\fB#include <sched.h>
|
|
|
|
.br
|
|
|
|
.sp
|
|
|
|
int sched_getscheduler(pid_t\fP \fIpid\fP\fB); \fP
|
|
|
|
\fB
|
|
|
|
.br
|
|
|
|
\fP
|
|
|
|
.SH DESCRIPTION
|
|
|
|
.LP
|
|
|
|
The \fIsched_getscheduler\fP() function shall return the scheduling
|
|
|
|
policy of the process specified by \fIpid\fP. If the value
|
|
|
|
of \fIpid\fP is negative, the behavior of the \fIsched_getscheduler\fP()
|
|
|
|
function is unspecified.
|
|
|
|
.LP
|
|
|
|
The values that can be returned by \fIsched_getscheduler\fP() are
|
|
|
|
defined in the \fI<sched.h>\fP header.
|
|
|
|
.LP
|
|
|
|
If a process specified by \fIpid\fP exists, and if the calling process
|
|
|
|
has permission, the scheduling policy shall be returned
|
|
|
|
for the process whose process ID is equal to \fIpid\fP.
|
|
|
|
.LP
|
|
|
|
If \fIpid\fP is zero, the scheduling policy shall be returned for
|
|
|
|
the calling process.
|
|
|
|
.SH RETURN VALUE
|
|
|
|
.LP
|
|
|
|
Upon successful completion, the \fIsched_getscheduler\fP() function
|
|
|
|
shall return the scheduling policy of the specified
|
|
|
|
process. If unsuccessful, the function shall return -1 and set \fIerrno\fP
|
|
|
|
to indicate the error.
|
|
|
|
.SH ERRORS
|
|
|
|
.LP
|
|
|
|
The \fIsched_getscheduler\fP() function shall fail if:
|
|
|
|
.TP 7
|
|
|
|
.B EPERM
|
|
|
|
The requesting process does not have permission to determine the scheduling
|
|
|
|
policy of the specified process.
|
|
|
|
.TP 7
|
|
|
|
.B ESRCH
|
|
|
|
No process can be found corresponding to that specified by \fIpid\fP.
|
|
|
|
.sp
|
|
|
|
.LP
|
|
|
|
\fIThe following sections are informative.\fP
|
|
|
|
.SH EXAMPLES
|
|
|
|
.LP
|
|
|
|
None.
|
|
|
|
.SH APPLICATION USAGE
|
|
|
|
.LP
|
|
|
|
None.
|
|
|
|
.SH RATIONALE
|
|
|
|
.LP
|
|
|
|
None.
|
|
|
|
.SH FUTURE DIRECTIONS
|
|
|
|
.LP
|
|
|
|
None.
|
|
|
|
.SH SEE ALSO
|
|
|
|
.LP
|
2007-09-20 17:56:19 +00:00
|
|
|
\fIsched_getparam\fP(), \fIsched_setparam\fP(), \fIsched_setscheduler\fP(),
|
|
|
|
the Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<sched.h>\fP
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH COPYRIGHT
|
|
|
|
Portions of this text are reprinted and reproduced in electronic form
|
|
|
|
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
|
|
|
|
-- Portable Operating System Interface (POSIX), The Open Group Base
|
|
|
|
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
|
|
|
|
Electrical and Electronics Engineers, Inc and The Open Group. In the
|
|
|
|
event of any discrepancy between this version and the original IEEE and
|
|
|
|
The Open Group Standard, the original IEEE and The Open Group Standard
|
|
|
|
is the referee document. The original Standard can be obtained online at
|
|
|
|
http://www.opengroup.org/unix/online.html .
|