Expose libbpf_num_possible_cpus

To fetch the number of "possible" (`/sys/devices/system/cpu/possible`) CPUs. This is needed in various PERCPU structures to compute the value size. More details in parca-dev/parca-agent#1696 (comment) Signed-off-by: Francisco Javier Honduvilla Coto <[email protected]>
aquasecurity · May 31, 2023 · 7c15abd · 7c15abd
1 parent 80f41e1
commit 7c15abd
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/libbpfgo.go b/libbpfgo.go
@@ -2089,3 +2089,11 @@ func BPFProgramTypeIsSupported(progType BPFProgType) (bool, error) {
 	}
 	return cSupported == 1, nil
 }
+
+func NumPossibleCPUs() (int, error) {
+	numCPUs, _ := C.libbpf_num_possible_cpus()
+	if numCPUs < 0 {
+		return 0, fmt.Errorf("failed to retrieve the number of CPUs")
+	}
+	return int(numCPUs), nil
+}