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https://github.com/eunomia-bpf/bpf-developer-tutorial.git
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58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
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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 "user_ringbuf.h"
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char _license[] SEC("license") = "GPL";
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struct
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{
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__uint(type, BPF_MAP_TYPE_USER_RINGBUF);
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__uint(max_entries, 256 * 1024);
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} user_ringbuf SEC(".maps");
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struct
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{
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__uint(type, BPF_MAP_TYPE_RINGBUF);
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__uint(max_entries, 256 * 1024);
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} kernel_ringbuf SEC(".maps");
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int read = 0;
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static long
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do_nothing_cb(struct bpf_dynptr *dynptr, void *context)
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{
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struct event *e;
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pid_t pid;
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/* get PID and TID of exiting thread/process */
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pid = bpf_get_current_pid_tgid() >> 32;
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/* reserve sample from BPF ringbuf */
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e = bpf_ringbuf_reserve(&kernel_ringbuf, sizeof(*e), 0);
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if (!e)
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return 0;
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e->pid = pid;
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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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__sync_fetch_and_add(&read, 1);
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return 0;
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}
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SEC("tracepoint/syscalls/sys_exit_kill")
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int kill_exit(struct trace_event_raw_sys_exit *ctx)
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{
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long num_samples;
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int err = 0;
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// receive data from userspace
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num_samples = bpf_user_ringbuf_drain(&user_ringbuf, do_nothing_cb, NULL, 0);
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return 0;
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} |