sched_getscheduler

Synopsis

#include <sched.h>

int sched_getscheduler(pid_t pid);

Status

Implemented

Conformance

IEEE Std 1003.1-2017

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; Phoenix-RTOS returns -1 and sets errno to EINVAL.

The values that can be returned by sched_getscheduler() are defined in the <sched.h> header. Phoenix-RTOS supports only the SCHED_RR policy, so SCHED_RR is returned for every process.

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. Phoenix-RTOS does not restrict access to the scheduling policy of other processes.

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.

POSIX deviations

No POSIX deviations discovered.