#!/usr/bin/env bpftrace
/*
 * killsnoop  Trace signals issued by the kill() syscall.
 *    For Linux, uses bpftrace and eBPF.
 *
 * USAGE: killsnoop.bt
 *
 * Also a basic example of bpftrace.
 *
 * This is a bpftrace version of the bcc tool of the same name.
 *
 * Copyright 2018 Netflix, Inc.
 * Licensed under the Apache License, Version 2.0 (the "License")
 *
 * 07-Sep-2018  Brendan Gregg Created this.
 */

BEGIN
{
  printf("Tracing kill() signals... Hit Ctrl-C to end.\n");
  printf("%-9s %-6s %-16s %-4s %-6s %s\n", "TIME", "PID", "COMM", "SIG",
      "TPID", "RESULT");
}

tracepoint:syscalls:sys_enter_kill
{
  @tpid[tid] = args->pid;
  @tsig[tid] = args->sig;
}

tracepoint:syscalls:sys_exit_kill
/@tpid[tid]/
{
  if (@tsig[tid] != 0) {
    time("%H:%M:%S  ");
    printf("%-6d %-16s %-4d %-6d %d\n", pid, comm, @tsig[tid], @tpid[tid],
        args->ret);
  delete(@tpid[tid]);
  delete(@tsig[tid]);
  }
}