sched_getparam

Synopsis

#include <sched.h>

int sched_getparam(pid_t pid, struct sched_param *param);

Status

Implemented

Conformance

IEEE Std 1003.1-2017

Description

The sched_getparam() function shall return the scheduling parameters of a process specified by pid in the sched_param structure pointed to by param.

If a process specified by pid exists, and if the calling process has permission, the scheduling parameters for the process whose process ID is equal to pid shall be returned. Phoenix-RTOS does not restrict access to the scheduling parameters of other processes.

If pid is zero, the scheduling parameters for the calling process shall be returned. The behavior of the sched_getparam() function is unspecified if the value of pid is negative; Phoenix-RTOS returns -1 and sets errno to EINVAL.

The sched_priority member is set to a POSIX priority, see Scheduling priorities.

Return value

Upon successful completion, the sched_getparam() function shall return zero. If the call to sched_getparam() is unsuccessful, the function shall return a value of -1 and set errno to indicate the error.

Errors

The sched_getparam() function shall fail if:

• EPERM - The requesting process does not have permission to obtain the scheduling parameters of the specified process.

• ESRCH - No process can be found corresponding to that specified by pid.

POSIX deviations

No POSIX deviations discovered.