sched_setaffinity (always EFAULTs) on Suse 2.6.4/5

Hi folks, I'm working with some guys at PGI/AMD to get some sched_setaffinity support in some runtime systems. We're having great difficulty getting sched_setaffinity working. The code below was constructed via the code in linux/kernel/sched.c, contrary to the prototypes and the like. Surely we must be doing something rather stupid, because we keep getting -EFAULT. The only thing I can guess is that the sizeof(cpumask) is different in kernel than it is in user land. Any help would be greatly appreciated... Phil #include #include #include #include #include void set_affin(void) { cpumask_t mask = { 0, }; int retval; cpu_set(1,mask); retval = sched_setaffinity(0,sizeof(cpumask_t),&mask); printf("sched_setaffinity returns %d, errno %d\n",retval,errno); perror("ERROR MESSAGE"); } int main(int argc, char **argv) { set_affin(); sleep(1); exit(0); }