// SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2020, Oracle and/or its affiliates. #include "vmlinux.h" #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> #include "bpf_misc.h" char _license[] SEC("license") = "GPL"; int trace_printk_ret = 0; int trace_printk_ran = 0; const char fmt[] = "Testing,testing %d\n"; SEC("fentry/" SYS_PREFIX "sys_nanosleep") int sys_enter(void *ctx) { trace_printk_ret = bpf_trace_printk(fmt, sizeof(fmt), ++trace_printk_ran); return 0; }