71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
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// 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/usdt.bpf.h>
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int urand_pid;
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int urand_read_without_sema_call_cnt;
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int urand_read_without_sema_buf_sz_sum;
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SEC("usdt/./urandom_read:urand:read_without_sema")
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int BPF_USDT(urand_read_without_sema, int iter_num, int iter_cnt, int buf_sz)
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{
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if (urand_pid != (bpf_get_current_pid_tgid() >> 32))
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return 0;
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__sync_fetch_and_add(&urand_read_without_sema_call_cnt, 1);
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__sync_fetch_and_add(&urand_read_without_sema_buf_sz_sum, buf_sz);
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return 0;
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}
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int urand_read_with_sema_call_cnt;
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int urand_read_with_sema_buf_sz_sum;
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SEC("usdt/./urandom_read:urand:read_with_sema")
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int BPF_USDT(urand_read_with_sema, int iter_num, int iter_cnt, int buf_sz)
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{
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if (urand_pid != (bpf_get_current_pid_tgid() >> 32))
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return 0;
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__sync_fetch_and_add(&urand_read_with_sema_call_cnt, 1);
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__sync_fetch_and_add(&urand_read_with_sema_buf_sz_sum, buf_sz);
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return 0;
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}
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int urandlib_read_without_sema_call_cnt;
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int urandlib_read_without_sema_buf_sz_sum;
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SEC("usdt/./liburandom_read.so:urandlib:read_without_sema")
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int BPF_USDT(urandlib_read_without_sema, int iter_num, int iter_cnt, int buf_sz)
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{
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if (urand_pid != (bpf_get_current_pid_tgid() >> 32))
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return 0;
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__sync_fetch_and_add(&urandlib_read_without_sema_call_cnt, 1);
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__sync_fetch_and_add(&urandlib_read_without_sema_buf_sz_sum, buf_sz);
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return 0;
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}
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int urandlib_read_with_sema_call_cnt;
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int urandlib_read_with_sema_buf_sz_sum;
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SEC("usdt/./liburandom_read.so:urandlib:read_with_sema")
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int BPF_USDT(urandlib_read_with_sema, int iter_num, int iter_cnt, int buf_sz)
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{
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if (urand_pid != (bpf_get_current_pid_tgid() >> 32))
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return 0;
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__sync_fetch_and_add(&urandlib_read_with_sema_call_cnt, 1);
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__sync_fetch_and_add(&urandlib_read_with_sema_buf_sz_sum, buf_sz);
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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