1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2019 Facebook 3 #include <linux/bpf.h> 4 #include <linux/version.h> 5 #include <bpf/bpf_helpers.h> 6 7 __u32 sig = 0, pid = 0, status = 0, signal_thread = 0; 8 9 static __always_inline int bpf_send_signal_test(void *ctx) 10 { 11 int ret; 12 13 if (status != 0 || pid == 0) 14 return 0; 15 16 if ((bpf_get_current_pid_tgid() >> 32) == pid) { 17 if (signal_thread) 18 ret = bpf_send_signal_thread(sig); 19 else 20 ret = bpf_send_signal(sig); 21 if (ret == 0) 22 status = 1; 23 } 24 25 return 0; 26 } 27 28 SEC("tracepoint/syscalls/sys_enter_nanosleep") 29 int send_signal_tp(void *ctx) 30 { 31 return bpf_send_signal_test(ctx); 32 } 33 34 SEC("tracepoint/sched/sched_switch") 35 int send_signal_tp_sched(void *ctx) 36 { 37 return bpf_send_signal_test(ctx); 38 } 39 40 SEC("perf_event") 41 int send_signal_perf(void *ctx) 42 { 43 return bpf_send_signal_test(ctx); 44 } 45 46 char __license[] SEC("license") = "GPL"; 47