131 lines
2.5 KiB
C++
131 lines
2.5 KiB
C++
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/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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#include <iostream>
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#include <unistd.h>
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#include <linux/bpf.h>
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#include <linux/btf.h>
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#include <bpf/libbpf.h>
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#include <bpf/bpf.h>
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#include <bpf/btf.h>
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#include "test_core_extern.skel.h"
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template <typename T>
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class Skeleton {
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private:
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T *skel;
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public:
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Skeleton(): skel(nullptr) { }
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~Skeleton() { if (skel) T::destroy(skel); }
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int open(const struct bpf_object_open_opts *opts = nullptr)
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{
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int err;
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if (skel)
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return -EBUSY;
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skel = T::open(opts);
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err = libbpf_get_error(skel);
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if (err) {
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skel = nullptr;
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return err;
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}
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return 0;
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}
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int load() { return T::load(skel); }
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int attach() { return T::attach(skel); }
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void detach() { return T::detach(skel); }
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const T* operator->() const { return skel; }
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T* operator->() { return skel; }
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const T *get() const { return skel; }
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};
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static void dump_printf(void *ctx, const char *fmt, va_list args)
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{
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}
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static void try_skeleton_template()
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{
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Skeleton<test_core_extern> skel;
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std::string prog_name;
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int err;
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LIBBPF_OPTS(bpf_object_open_opts, opts);
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err = skel.open(&opts);
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if (err) {
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fprintf(stderr, "Skeleton open failed: %d\n", err);
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return;
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}
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skel->data->kern_ver = 123;
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skel->data->int_val = skel->data->ushort_val;
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err = skel.load();
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if (err) {
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fprintf(stderr, "Skeleton load failed: %d\n", err);
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return;
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}
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if (!skel->kconfig->CONFIG_BPF_SYSCALL)
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fprintf(stderr, "Seems like CONFIG_BPF_SYSCALL isn't set?!\n");
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err = skel.attach();
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if (err) {
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fprintf(stderr, "Skeleton attach failed: %d\n", err);
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return;
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}
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prog_name = bpf_program__name(skel->progs.handle_sys_enter);
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if (prog_name != "handle_sys_enter")
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fprintf(stderr, "Unexpected program name: %s\n", prog_name.c_str());
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bpf_link__destroy(skel->links.handle_sys_enter);
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skel->links.handle_sys_enter = bpf_program__attach(skel->progs.handle_sys_enter);
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skel.detach();
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/* destructor will destroy underlying skeleton */
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}
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int main(int argc, char *argv[])
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{
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struct btf_dump_opts opts = { };
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struct test_core_extern *skel;
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struct btf *btf;
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int fd;
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try_skeleton_template();
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/* libbpf.h */
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libbpf_set_print(NULL);
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/* bpf.h */
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bpf_prog_get_fd_by_id(0);
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/* btf.h */
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btf = btf__new(NULL, 0);
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if (!libbpf_get_error(btf))
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btf_dump__new(btf, dump_printf, nullptr, &opts);
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/* BPF skeleton */
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skel = test_core_extern__open_and_load();
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test_core_extern__destroy(skel);
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fd = bpf_enable_stats(BPF_STATS_RUN_TIME);
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if (fd < 0)
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std::cout << "FAILED to enable stats: " << fd << std::endl;
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else
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::close(fd);
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std::cout << "DONE!" << std::endl;
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return 0;
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}
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