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-rw-r--r--samples/bpf/spintest_user.c84
1 files changed, 84 insertions, 0 deletions
diff --git a/samples/bpf/spintest_user.c b/samples/bpf/spintest_user.c
new file mode 100644
index 0000000000..55971edb10
--- /dev/null
+++ b/samples/bpf/spintest_user.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <assert.h>
+#include <bpf/libbpf.h>
+#include <bpf/bpf.h>
+#include "trace_helpers.h"
+
+int main(int ac, char **argv)
+{
+ struct bpf_object *obj = NULL;
+ struct bpf_link *links[20];
+ long key, next_key, value;
+ struct bpf_program *prog;
+ int map_fd, i, j = 0;
+ char filename[256];
+ struct ksym *sym;
+
+ if (load_kallsyms()) {
+ printf("failed to process /proc/kallsyms\n");
+ return 2;
+ }
+
+ 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");
+ obj = NULL;
+ goto cleanup;
+ }
+
+ /* 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;
+ }
+
+ bpf_object__for_each_program(prog, obj) {
+ links[j] = bpf_program__attach(prog);
+ if (libbpf_get_error(links[j])) {
+ fprintf(stderr, "bpf_program__attach failed\n");
+ links[j] = NULL;
+ goto cleanup;
+ }
+ j++;
+ }
+
+ for (i = 0; i < 5; i++) {
+ key = 0;
+ printf("kprobing funcs:");
+ while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {
+ bpf_map_lookup_elem(map_fd, &next_key, &value);
+ assert(next_key == value);
+ sym = ksym_search(value);
+ key = next_key;
+ if (!sym) {
+ printf("ksym not found. Is kallsyms loaded?\n");
+ continue;
+ }
+
+ printf(" %s", sym->name);
+ }
+ if (key)
+ printf("\n");
+ key = 0;
+ while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0)
+ bpf_map_delete_elem(map_fd, &next_key);
+ sleep(1);
+ }
+
+cleanup:
+ for (j--; j >= 0; j--)
+ bpf_link__destroy(links[j]);
+
+ bpf_object__close(obj);
+ return 0;
+}