Merge pull request #1794 from utam0k/bpftrace

Add the bpftrace program file for debugging.

Makefile

@@ -67,6 +67,10 @@ lint:
 	cargo fmt --all -- --check
 	cargo clippy --all-targets --all-features -- -D warnings
 
+.PHONY: hack/bpftrace
+hack/bpftrace:
+	BPFTRACE_STRLEN=120 ./hack/debug.bt
+
 .PHONY: clean
 clean:
 	./scripts/clean.sh $(ROOT)

hack/debug.bt

@@ -0,0 +1,52 @@
+#!/usr/bin/env bpftrace
+
+BEGIN
+{
+    printf("Tracing Youki syscalls... Hit Ctrl-C to end.\n");
+    printf("%-12s %-10s %-8s %-9s %s\n", "TIME", "COMMAND", "PID", "EVENT", "CONTENT"); 
+}
+
+tracepoint:syscalls:sys_enter_write
+/comm == "4"|| comm == "youki*"/
+{
+
+    $s = str(args->buf, args->count);
+    if ($s != "\n") {
+        printf("%-12ld %-10s %-8d %-9s ", elapsed , comm, pid, "write");
+        printf("fd=%d, %s\n", args->fd, $s);
+    }
+}
+
+tracepoint:syscalls:sys_enter_open,
+tracepoint:syscalls:sys_enter_openat
+/comm == "4"|| comm == "youki"/
+{
+	@filename[tid] = args->filename;
+}
+
+
+tracepoint:syscalls:sys_exit_open,
+tracepoint:syscalls:sys_exit_openat
+/@filename[tid]/
+{
+	$ret = args->ret;
+	$fd = $ret >= 0 ? $ret : -1;
+	$errno = $ret >= 0 ? 0 : - $ret;
+
+    printf("%-12ld %-10s %-8d %-9s ", elapsed , comm, pid, "open");
+	printf("errno=%d, fd=%d, file=%s\n", $errno, $fd, str(@filename[tid]));
+	delete(@filename[tid]);
+}
+
+tracepoint:syscalls:sys_enter_clone3
+/comm == "4"|| comm == "youki"/
+{
+    printf("%-12ld %-10s %-8d %-9s ", elapsed , comm, pid, "clone3");
+}
+
+END
+{
+    clear(@filename);
+    printf("Tracing ended.\n");
+}
+