1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2021 Facebook */ 3 #include "vmlinux.h" 4 #include <bpf/bpf_helpers.h> 5 #include <bpf/bpf_tracing.h> 6 7 char LICENSE[] SEC("license") = "GPL"; 8 9 int pid = 0; 10 int fentry_cnt = 0; 11 int fexit_cnt = 0; 12 13 SEC("fentry/__x64_sys_nanosleep") 14 int BPF_PROG(nanosleep_fentry, const struct pt_regs *regs) 15 { 16 if (bpf_get_current_pid_tgid() >> 32 != pid) 17 return 0; 18 19 fentry_cnt++; 20 return 0; 21 } 22 23 SEC("fexit/__x64_sys_nanosleep") 24 int BPF_PROG(nanosleep_fexit, const struct pt_regs *regs, int ret) 25 { 26 if (bpf_get_current_pid_tgid() >> 32 != pid) 27 return 0; 28 29 fexit_cnt++; 30 return 0; 31 } 32