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52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
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/* Copyright (c) 2020 Facebook */
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include <bpf/bpf_core_read.h>
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#include "exitsnoop.h"
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char LICENSE[] SEC("license") = "Dual BSD/GPL";
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struct {
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__uint(type, BPF_MAP_TYPE_RINGBUF);
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__uint(max_entries, 256 * 1024);
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} rb SEC(".maps");
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SEC("tp/sched/sched_process_exit")
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int handle_exit(struct trace_event_raw_sched_process_template* ctx)
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{
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struct task_struct *task;
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struct event *e;
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pid_t pid, tid;
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u64 id, ts, *start_ts, start_time = 0;
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/* get PID and TID of exiting thread/process */
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id = bpf_get_current_pid_tgid();
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pid = id >> 32;
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tid = (u32)id;
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/* ignore thread exits */
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if (pid != tid)
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return 0;
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/* reserve sample from BPF ringbuf */
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e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0);
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if (!e)
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return 0;
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/* fill out the sample with data */
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task = (struct task_struct *)bpf_get_current_task();
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start_time = BPF_CORE_READ(task, start_time);
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e->duration_ns = bpf_ktime_get_ns() - start_time;
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e->pid = pid;
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e->ppid = BPF_CORE_READ(task, real_parent, tgid);
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e->exit_code = (BPF_CORE_READ(task, exit_code) >> 8) & 0xff;
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bpf_get_current_comm(&e->comm, sizeof(e->comm));
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/* send data to user-space for post-processing */
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bpf_ringbuf_submit(e, 0);
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return 0;
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}
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