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1-helloworld/.gitignore

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+.vscode
+package.json
+*.o
+*.skel.json
+*.skel.yaml
+package.yaml
+ecli

1-helloworld/minimal.bpf.c

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+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+#define BPF_NO_GLOBAL_DATA
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+typedef unsigned int u32;
+typedef int pid_t;
+const pid_t pid_filter = 0;
+
+char LICENSE[] SEC("license") = "Dual BSD/GPL";
+
+SEC("tp/syscalls/sys_enter_write")
+int handle_tp(void *ctx)
+{
+	pid_t pid = bpf_get_current_pid_tgid() >> 32;
+	if (pid_filter && pid != pid_filter)
+		return 0;
+	bpf_printk("BPF triggered from PID %d.\n", pid);
+	return 0;
+}