change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/samples/bpf/tracex6_user.c
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@@ -4,7 +4,6 @@
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 #include <assert.h>
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 #include <fcntl.h>
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 #include <linux/perf_event.h>
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-#include <linux/bpf.h>
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 #include <sched.h>
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 #include <stdio.h>
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 #include <stdlib.h>
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@@ -15,11 +14,14 @@
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 #include <sys/wait.h>
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 #include <unistd.h>
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-#include "bpf_load.h"
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 #include <bpf/bpf.h>
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+#include <bpf/libbpf.h>
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 #include "perf-sys.h"
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 #define SAMPLE_PERIOD  0x7fffffffffffffffULL
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+
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+/* counters, values, values2 */
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+static int map_fd[3];
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 static void check_on_cpu(int cpu, struct perf_event_attr *attr)
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 {
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@@ -174,16 +176,51 @@
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 int main(int argc, char **argv)
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 {
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 	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
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+	struct bpf_link *links[2];
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+	struct bpf_program *prog;
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+	struct bpf_object *obj;
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 	char filename[256];
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-
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-	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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+	int i = 0;
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 	setrlimit(RLIMIT_MEMLOCK, &r);
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-	if (load_bpf_file(filename)) {
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-		printf("%s", bpf_log_buf);
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-		return 1;
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+
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+	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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+	obj = bpf_object__open_file(filename, NULL);
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+	if (libbpf_get_error(obj)) {
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+		fprintf(stderr, "ERROR: opening BPF object file failed\n");
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+		return 0;
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+	}
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+
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+	/* load BPF program */
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+	if (bpf_object__load(obj)) {
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+		fprintf(stderr, "ERROR: loading BPF object file failed\n");
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+		goto cleanup;
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+	}
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+
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+	map_fd[0] = bpf_object__find_map_fd_by_name(obj, "counters");
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+	map_fd[1] = bpf_object__find_map_fd_by_name(obj, "values");
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+	map_fd[2] = bpf_object__find_map_fd_by_name(obj, "values2");
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+	if (map_fd[0] < 0 || map_fd[1] < 0 || map_fd[2] < 0) {
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+		fprintf(stderr, "ERROR: finding a map in obj file failed\n");
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+		goto cleanup;
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+	}
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+
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+	bpf_object__for_each_program(prog, obj) {
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+		links[i] = bpf_program__attach(prog);
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+		if (libbpf_get_error(links[i])) {
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+			fprintf(stderr, "ERROR: bpf_program__attach failed\n");
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+			links[i] = NULL;
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+			goto cleanup;
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+		}
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+		i++;
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 	}
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 	test_bpf_perf_event();
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+
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+cleanup:
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+	for (i--; i >= 0; i--)
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+		bpf_link__destroy(links[i]);
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+
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+	bpf_object__close(obj);
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 	return 0;
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 }