The Open Group Base Specifications Issue 7
IEEE Std 1003.1, 2013 Edition
Copyright © 2001-2013 The IEEE and The Open Group

#### NAME

> sched_getscheduler - get scheduling policy (REALTIME)

#### SYNOPSIS

> ``[PS] #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.

#### EXAMPLES

> None.

#### APPLICATION USAGE

> None.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> sched_getparam, sched_setparam, sched_setscheduler

> XBD <sched.h>

#### CHANGE HISTORY

> First released in Issue 5. Included for alignment with the POSIX Realtime Extension.

#### Issue 6

> The sched_getscheduler() function is marked as part of the Process Scheduling option.

> The [ENOSYS] error condition has been removed as stubs need not be provided if an implementation does not support the Process Scheduling option.

End of informative text.

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