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.
The sched_getscheduler() function shall return the scheduling policy
of the process specified by pid. If the value of pid is negative,
the behavior of the sched_getscheduler() function is unspecified.
The values that can be returned by sched_getscheduler() are defined
in the <sched.h> header.
If a process specified by pid exists, and if the calling process has
permission, the scheduling policy shall be returned for the process
whose process ID is equal to pid.
If pid is zero, the scheduling policy shall be returned for the
Upon successful completion, the sched_getscheduler() function shall
return the scheduling policy of the specified process. If
unsuccessful, the function shall return −1 and set errno to indicate
The sched_getscheduler() function shall fail if:
EPERM The requesting process does not have permission to determine
the scheduling policy of the specified process.
ESRCH No process can be found corresponding to that specified by
The following sections are informative.
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) 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.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
IEEE/The Open Group 2013 SCHED_GETSCHEDULER(3P)