The sched_getparam() function returns 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 will be returned.

If pid is 0, the scheduling parameters for the calling process will be returned. The behavior of the sched_getparam() function is unspecified if the value of pid is negative.

Upon successful completion, the sched_getparam() function returns 0. If the call to sched_getparam() is unsuccessful, the function returns -1 and sets errno to indicate the error.

The sched_getparam() function will fail if:

ENOSYS

The sched_getparam() function is not supported by the system.

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.

See attributes(5) for descriptions of the following attributes:

librt(3LIB), sched(3HEAD), sched_getscheduler(3RT), sched_setparam(3RT), sched_setscheduler(3RT), attributes(5)

Solaris 2.6 was the first release to support libposix4/librt. Prior to this release, this function always returned -1 and set errno to ENOSYS.