tools/testing/selftests/bpf/progs/test_send_signal_kern.c

   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 || sig == 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";