+__clib_export clib_bitmap_t *
+os_get_cpu_affinity_bitmap (int pid)
+{
+#if __linux
+ int index, ret;
+ cpu_set_t cpuset;
+ uword *affinity_cpus;
+
+ clib_bitmap_alloc (affinity_cpus, sizeof (cpu_set_t));
+ clib_bitmap_zero (affinity_cpus);
+
+ __CPU_ZERO_S (sizeof (cpu_set_t), &cpuset);
+
+ ret = syscall (SYS_sched_getaffinity, 0, sizeof (cpu_set_t), &cpuset);
+
+ if (ret < 0)
+ {
+ clib_bitmap_free (affinity_cpus);
+ return 0;
+ }
+
+ for (index = 0; index < sizeof (cpu_set_t); index++)
+ if (__CPU_ISSET_S (index, sizeof (cpu_set_t), &cpuset))
+ clib_bitmap_set (affinity_cpus, index, 1);
+ return affinity_cpus;
+#else
+ return 0;
+#endif
+}
+