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git.proxmox.com Git - mirror_ubuntu-hirsute-kernel.git/blob - samples/bpf/spintest_user.c
1 // SPDX-License-Identifier: GPL-2.0
6 #include <sys/resource.h>
7 #include <bpf/libbpf.h>
9 #include "trace_helpers.h"
11 int main(int ac
, char **argv
)
13 struct rlimit r
= {RLIM_INFINITY
, RLIM_INFINITY
};
14 char filename
[256], symbol
[256];
15 struct bpf_object
*obj
= NULL
;
16 struct bpf_link
*links
[20];
17 long key
, next_key
, value
;
18 struct bpf_program
*prog
;
23 if (setrlimit(RLIMIT_MEMLOCK
, &r
)) {
24 perror("setrlimit(RLIMIT_MEMLOCK)");
28 if (load_kallsyms()) {
29 printf("failed to process /proc/kallsyms\n");
33 snprintf(filename
, sizeof(filename
), "%s_kern.o", argv
[0]);
34 obj
= bpf_object__open_file(filename
, NULL
);
35 if (libbpf_get_error(obj
)) {
36 fprintf(stderr
, "ERROR: opening BPF object file failed\n");
41 /* load BPF program */
42 if (bpf_object__load(obj
)) {
43 fprintf(stderr
, "ERROR: loading BPF object file failed\n");
47 map_fd
= bpf_object__find_map_fd_by_name(obj
, "my_map");
49 fprintf(stderr
, "ERROR: finding a map in obj file failed\n");
53 bpf_object__for_each_program(prog
, obj
) {
54 section
= bpf_program__section_name(prog
);
55 if (sscanf(section
, "kprobe/%s", symbol
) != 1)
58 /* Attach prog only when symbol exists */
59 if (ksym_get_addr(symbol
)) {
60 links
[j
] = bpf_program__attach(prog
);
61 if (libbpf_get_error(links
[j
])) {
62 fprintf(stderr
, "bpf_program__attach failed\n");
70 for (i
= 0; i
< 5; i
++) {
72 printf("kprobing funcs:");
73 while (bpf_map_get_next_key(map_fd
, &key
, &next_key
) == 0) {
74 bpf_map_lookup_elem(map_fd
, &next_key
, &value
);
75 assert(next_key
== value
);
76 sym
= ksym_search(value
);
79 printf("ksym not found. Is kallsyms loaded?\n");
83 printf(" %s", sym
->name
);
88 while (bpf_map_get_next_key(map_fd
, &key
, &next_key
) == 0)
89 bpf_map_delete_elem(map_fd
, &next_key
);
94 for (j
--; j
>= 0; j
--)
95 bpf_link__destroy(links
[j
]);
97 bpf_object__close(obj
);