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#!/usr/bin/env bpftrace
// Copyright 2022 Nicolas Hillegeer <nicolas@hillegeer.com>
// Modifications Copyright 2023 Paul Wallrabe <pwallrab@redhat.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This file is based on the work of Nicolas Hillegeer <nicolas@hillegeer.com>
// and has been modified by Paul Wallrabe <pwallrab@redhat.com> to add support
// for normalized timestamps and implemented a trigger to start printing to
// console once a certain condition is reached specific to Podman.
//
// Traces processes that are created using the fork/exec model.
// Output is printed after the first command containing "podman" is executed.
//
// Usage: sudo ./fork_exec_snoop.bt
//
// TRACEPOINT: This field represents the name of the tracepoint.
// T: This field denotes the timestamp in μs when the tracepoint was triggered.
// DT: This field shows the delta time between enter and exit tracepoints in μs.
// PID: This field represents the Process ID.
// PPID: This field stands for the Parent Process ID.
// TGID: This field indicates the Thread Group ID.
// PTGID: This field denotes the Parent Thread Group ID.
// CMD: This field represents the command name (executable name) and args.
//
// Limitations: The output contains entries from all processes using fork/exec.
BEGIN {
printf("%-25s %-12s %-12s %-8s %-8s %-8s %-8s %s\n",
"TRACEPOINT",
"T",
"DT",
"PID",
"PPID",
"TGID",
"PTGID",
"CMD"
);
@time_divisor = (uint64) 1000;
}
tracepoint:syscalls:sys_enter_clone
{
$time = nsecs;
@time_start_fork_parent[tid] = $time;
@time_start_fork_child[tid] = $time;
if (@time_normalized)
{
printf("%-25s %-12u %-12s %-8d %-8d %-8d %-8d %s\n",
"syscalls:sys_enter_clone",
($time - @time_normalized) / @time_divisor,
"",
curtask->pid,
curtask->parent->pid,
curtask->tgid,
curtask->parent->tgid,
comm
);
}
}
tracepoint:syscalls:sys_exit_clone
/args->ret == 0 && @time_start_fork_child[curtask->parent->pid]/
{
$time = nsecs;
$ptid = curtask->parent->pid;
if (@time_normalized)
{
printf("%-25s %-12u %-12u %-8d %-8d %-8d %-8d %s\n",
"syscalls:sys_exit_clone",
($time - @time_normalized) / @time_divisor,
($time - @time_start_fork_child[$ptid]) / @time_divisor,
curtask->pid,
curtask->parent->pid,
curtask->tgid,
$ptid,
comm
);
}
delete(@time_start_fork_child[$ptid]);
}
tracepoint:syscalls:sys_exit_clone
/args->ret > 0 && @time_start_fork_parent[tid]/
{
$time = nsecs;
if (@time_normalized)
{
printf("%-25s %-12u %-12u %-8d %-8d %-8d %-8d %s\n",
"syscalls:sys_exit_clone",
($time - @time_normalized) / @time_divisor,
($time - @time_start_fork_parent[tid]) / @time_divisor,
curtask->pid,
curtask->parent->pid,
curtask->tgid,
curtask->parent->tgid,
comm
);
}
delete(@time_start_fork_parent[tid]);
}
tracepoint:syscalls:sys_enter_exec*
{
$time = nsecs;
@time_start_exec[tid] = $time;
if (@time_normalized)
{
printf("%-25s %-12u %-12s %-8d %-8d %-8d %-8d %s",
"syscalls:sys_enter_exec*",
($time - @time_normalized) / @time_divisor,
"",
curtask->pid,
curtask->parent->pid,
curtask->tgid,
curtask->parent->tgid,
""
);
join(args->argv);
}
}
tracepoint:syscalls:sys_exit_exec*
/@time_start_exec[pid]/
{
$time = nsecs;
if (!@time_normalized && strncmp("podman", comm, 6) == 0)
{
@time_normalized = $time;
}
if (@time_normalized)
{
printf("%-25s %-12u %-12u %-8d %-8d %-8d %-8d %s\n",
"syscalls:sys_exit_exec*",
($time - @time_normalized) / @time_divisor,
($time - @time_start_exec[tid]) / @time_divisor,
curtask->pid,
curtask->parent->pid,
curtask->tgid,
curtask->parent->tgid,
comm
);
}
delete(@time_start_exec[tid]);
}
END
{
delete(@time_divisor);
delete(@time_normalized);
}
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