77 lines
1.6 KiB
C
77 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2021. Huawei Technologies Co., Ltd */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <linux/bpf.h>
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#include <linux/err.h>
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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#define READ_TP_NAME "fs_file_read"
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#define RELEASE_TP_NAME "fs_file_release"
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int main(int argc, char *argv[])
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{
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const char *name = "./file_read_pattern_prog.bpf.o";
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struct bpf_object *obj;
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struct bpf_program *prog;
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int err = 0;
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int read_fd;
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int release_fd;
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obj = bpf_object__open_file(name, NULL);
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if (!obj) {
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err = -errno;
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printf("Failed to open program: %s\n", name);
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return err;
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}
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err = bpf_object__load(obj);
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if (err) {
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printf("failed to load program: %s\n", name);
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goto out;
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}
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prog = bpf_object__find_program_by_name(obj, READ_TP_NAME);
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if (!prog) {
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err = -errno;
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printf("no prog %s\n", READ_TP_NAME);
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goto out;
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}
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read_fd = bpf_raw_tracepoint_open(READ_TP_NAME, bpf_program__fd(prog));
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if (read_fd < 0) {
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err = read_fd;
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printf("Failed to attach raw tracepoint %s\n", READ_TP_NAME);
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goto out;
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}
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prog = bpf_object__find_program_by_name(obj, RELEASE_TP_NAME);
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if (!prog) {
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err = -errno;
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printf("no prog %s\n", RELEASE_TP_NAME);
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close(read_fd);
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goto out;
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}
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release_fd = bpf_raw_tracepoint_open(RELEASE_TP_NAME,
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bpf_program__fd(prog));
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if (release_fd < 0) {
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err = release_fd;
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printf("Failed to attach raw tracepoint %s\n", RELEASE_TP_NAME);
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close(read_fd);
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goto out;
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}
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pause();
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close(release_fd);
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close(read_fd);
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out:
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bpf_object__close(obj);
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return err;
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}
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