Add implementation of numProcs for AIX with cgo

host/host_aix.go

@@ -26,10 +26,6 @@ func HostIDWithContext(ctx context.Context) (string, error) {
 	return strings.Split(string(out), "\n")[0], nil
 }
 
-func numProcs(_ context.Context) (uint64, error) {
-	return 0, common.ErrNotImplementedError
-}
-
 func BootTimeWithContext(ctx context.Context) (btime uint64, err error) {
 	return common.BootTimeWithContext(ctx, invoke)
 }

host/host_aix_cgo.go

@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: BSD-3-Clause
+//go:build aix && cgo
+
+package host
+
+/*
+#include <procinfo.h>
+*/
+import "C"
+
+import (
+	"context"
+	"unsafe"
+)
+
+func numProcs(_ context.Context) (uint64, error) {
+	info := C.struct_procentry64{}
+	cpid := C.pid_t(0)
+	var count uint64
+	for {
+		n, err := C.getprocs64(unsafe.Pointer(&info), C.sizeof_struct_procentry64, nil, 0, &cpid, 1)
+		if err != nil {
+			return 0, err
+		}
+		if n == 0 {
+			break
+		}
+		count++
+	}
+	return count, nil
+}

host/host_aix_nocgo.go

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: BSD-3-Clause
+//go:build aix && !cgo
+
+package host
+
+import (
+	"context"
+
+	"github.com/shirou/gopsutil/v4/internal/common"
+)
+
+func numProcs(_ context.Context) (uint64, error) {
+	return 0, common.ErrNotImplementedError
+}