whatcanGOwrong

go/pkg/mod/github.com/cilium/ebpf@v0.11.0/internal/sys/ptr.go

@@ -0,0 +1,52 @@
+package sys
+
+import (
+	"unsafe"
+
+	"github.com/cilium/ebpf/internal/unix"
+)
+
+// NewPointer creates a 64-bit pointer from an unsafe Pointer.
+func NewPointer(ptr unsafe.Pointer) Pointer {
+	return Pointer{ptr: ptr}
+}
+
+// NewSlicePointer creates a 64-bit pointer from a byte slice.
+func NewSlicePointer(buf []byte) Pointer {
+	if len(buf) == 0 {
+		return Pointer{}
+	}
+
+	return Pointer{ptr: unsafe.Pointer(&buf[0])}
+}
+
+// NewSlicePointerLen creates a 64-bit pointer from a byte slice.
+//
+// Useful to assign both the pointer and the length in one go.
+func NewSlicePointerLen(buf []byte) (Pointer, uint32) {
+	return NewSlicePointer(buf), uint32(len(buf))
+}
+
+// NewStringPointer creates a 64-bit pointer from a string.
+func NewStringPointer(str string) Pointer {
+	p, err := unix.BytePtrFromString(str)
+	if err != nil {
+		return Pointer{}
+	}
+
+	return Pointer{ptr: unsafe.Pointer(p)}
+}
+
+// NewStringSlicePointer allocates an array of Pointers to each string in the
+// given slice of strings and returns a 64-bit pointer to the start of the
+// resulting array.
+//
+// Use this function to pass arrays of strings as syscall arguments.
+func NewStringSlicePointer(strings []string) Pointer {
+	sp := make([]Pointer, 0, len(strings))
+	for _, s := range strings {
+		sp = append(sp, NewStringPointer(s))
+	}
+
+	return Pointer{ptr: unsafe.Pointer(&sp[0])}
+}