// SPDX-License-Identifier: GPL-2.0-only#include <stdio.h>#include <fcntl.h>#include <poll.h>#include <time.h>#include <signal.h>#include <bpf/libbpf.h> static __u64 time_get_ns(void){	struct timespec ts; 	clock_gettime(CLOCK_MONOTONIC, &ts);	return ts.tv_sec * 1000000000ull + ts.tv_nsec;} static __u64 start_time;static __u64 cnt; #define MAX_CNT 100000ll static void print_bpf_output(void *ctx, int cpu, void *data, __u32 size){	struct {		__u64 pid;		__u64 cookie;	} *e = data; 	if (e->cookie != 0x12345678) {		printf("BUG pid %llx cookie %llx sized %d\n",		       e->pid, e->cookie, size);		return;	} 	cnt++; 	if (cnt == MAX_CNT) {		printf("recv %lld events per sec\n",		       MAX_CNT * 1000000000ll / (time_get_ns() - start_time));		return;	}} int main(int argc, char **argv){	struct bpf_link *link = NULL;	struct bpf_program *prog;	struct perf_buffer *pb;	struct bpf_object *obj;	int map_fd, ret = 0;	char filename[256];	FILE *f; 	snprintf(filename, sizeof(filename), "%s.bpf.o", argv[0]);	obj = bpf_object__open_file(filename, NULL);	if (libbpf_get_error(obj)) {		fprintf(stderr, "ERROR: opening BPF object file failed\n");		return 0;	} 	/* load BPF program */	if (bpf_object__load(obj)) {		fprintf(stderr, "ERROR: loading BPF object file failed\n");		goto cleanup;	} 	map_fd = bpf_object__find_map_fd_by_name(obj, "my_map");	if (map_fd < 0) {		fprintf(stderr, "ERROR: finding a map in obj file failed\n");		goto cleanup;	} 	prog = bpf_object__find_program_by_name(obj, "bpf_prog1");	if (libbpf_get_error(prog)) {		fprintf(stderr, "ERROR: finding a prog in obj file failed\n");		goto cleanup;	} 	link = bpf_program__attach(prog);	if (libbpf_get_error(link)) {		fprintf(stderr, "ERROR: bpf_program__attach failed\n");		link = NULL;		goto cleanup;	} 	pb = perf_buffer__new(map_fd, 8, print_bpf_output, NULL, NULL, NULL);	ret = libbpf_get_error(pb);	if (ret) {		printf("failed to setup perf_buffer: %d\n", ret);		return 1;	} 	f = popen("taskset 1 dd if=/dev/zero of=/dev/null", "r");	(void) f; 	start_time = time_get_ns();	while ((ret = perf_buffer__poll(pb, 1000)) >= 0 && cnt < MAX_CNT) {	}	kill(0, SIGINT); cleanup:	bpf_link__destroy(link);	bpf_object__close(obj);	return ret;}