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.

EXAMPLES

None.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

sched_getparam(), sched_setparam(), sched_setscheduler(), the Base Definitions volume of IEEE Std 1003.1-2001, <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.