sched_getscheduler man page

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.

sched_getscheduler — get scheduling policy (REALTIME)

Synopsis

#include <sched.h>

int sched_getscheduler(pid_t pid);

Description

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 calling process.

Return Value

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 error.

Errors

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 pid.

The following sections are informative.

See Also

sched_getparam(), sched_setparam(), sched_setscheduler()

The Base Definitions volume of POSIX.1‐2008, <sched.h>

Info

2013 IEEE/The Open Group POSIX Programmer's Manual