1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2020, Oracle and/or its affiliates. 3 4 #include "vmlinux.h" 5 #include <bpf/bpf_helpers.h> 6 #include <bpf/bpf_tracing.h> 7 8 char _license[] SEC("license") = "GPL"; 9 10 int trace_printk_ret = 0; 11 int trace_printk_ran = 0; 12 13 const char fmt[] = "Testing,testing %d\n"; 14 15 SEC("fentry/__x64_sys_nanosleep") 16 int sys_enter(void *ctx) 17 { 18 trace_printk_ret = bpf_trace_printk(fmt, sizeof(fmt), 19 ++trace_printk_ran); 20 return 0; 21 } 22