The sched_getparam() function shall return the scheduling parameters of a process specified by pid in the sched_param structure pointed to by param. When pid = 0, the scheduling parameters are returned for the calling process sched_getparam() returns 0 on success sched_getparam() returns -1 on failure sched_getparam() sets errno == ESRCH if the pid cannot be found sched_getparam() sets errno == EPERM if the requesting process does not have permission sched_getparam() sets errno == EFAULT or EINVAL if param points to NULL