test/integration-ebpf: added integration tests for kretprobe & uretprobe

Added integration test methods for kretprobe and uretprobe with their
appropriate contexts.

test/integration-ebpf/src/test.rs

@@ -3,8 +3,8 @@
 
 use aya_ebpf::{
     bindings::xdp_action,
-    macros::{kprobe, tracepoint, uprobe, xdp},
-    programs::{ProbeContext, TracePointContext, XdpContext},
+    macros::{kprobe, kretprobe, tracepoint, uprobe, uretprobe, xdp},
+    programs::{ProbeContext, RetProbeContext, TracePointContext, XdpContext},
 };
 
 #[xdp]
@@ -24,6 +24,11 @@ pub fn test_kprobe(_ctx: ProbeContext) -> u32 {
     0
 }
 
+#[kretprobe]
+pub fn test_kretprobe(_ctx: RetProbeContext) -> u32 {
+    0
+}
+
 #[tracepoint]
 pub fn test_tracepoint(_ctx: TracePointContext) -> u32 {
     0
@@ -34,6 +39,11 @@ pub fn test_uprobe(_ctx: ProbeContext) -> u32 {
     0
 }
 
+#[uretprobe]
+pub fn test_uretprobe(_ctx: RetProbeContext) -> u32 {
+    0
+}
+
 #[cfg(not(test))]
 #[panic_handler]
 fn panic(_info: &core::panic::PanicInfo) -> ! {