tools/testing/selftests/bpf/prog_tests/bpf_attr_size.c
Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/prog_tests/bpf_attr_size.c
File Facts
- System
- Linux kernel
- Corpus path
tools/testing/selftests/bpf/prog_tests/bpf_attr_size.c- Extension
.c- Size
- 3310 bytes
- Lines
- 125
- Domain
- Support Tooling And Documentation
- Bucket
- tools
- Inferred role
- Support Tooling And Documentation: implementation source
- Status
- source implementation candidate
Why This File Exists
Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
- Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/bpf.hunistd.hsys/syscall.htest_progs.hcgroup_helpers.hcgroup_skb_direct_packet_access.skel.h
Detected Declarations
struct bpf_map_info_fakestruct bpf_prog_info_fakefunction test_query_size_boundariesfunction test_map_info_tail_zerofunction test_prog_info_tail_zerofunction test_bpf_attr_size
Annotated Snippet
struct bpf_map_info_fake {
__u8 info[offsetofend(struct bpf_map_info, hash_size)];
__u32 pad;
} info = {
.pad = 1,
};
int map_fd, err;
__u32 info_len;
map_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, "arr", sizeof(int), 1, 1, &map_opts);
if (!ASSERT_GE(map_fd, 0, "bpf_map_create"))
return;
info_len = sizeof(info);
err = bpf_obj_get_info_by_fd(map_fd, &info, &info_len);
ASSERT_EQ(err, -E2BIG, "bpf_obj_get_info_by_fd");
close(map_fd);
}
static void test_prog_info_tail_zero(void)
{
LIBBPF_OPTS(bpf_prog_load_opts, prog_opts);
struct bpf_insn insns[] = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
};
struct bpf_prog_info_fake {
__u8 info[offsetofend(struct bpf_prog_info, attach_btf_id)];
__u32 pad;
} info = {
.pad = 1,
};
int prog_fd, err;
__u32 info_len;
prog_fd = bpf_prog_load(BPF_PROG_TYPE_SOCKET_FILTER, "test_prog", "GPL", insns,
ARRAY_SIZE(insns), &prog_opts);
if (!ASSERT_GE(prog_fd, 0, "bpf_prog_load"))
return;
info_len = sizeof(info);
err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
ASSERT_EQ(err, -E2BIG, "bpf_obj_get_info_by_fd");
close(prog_fd);
}
void test_bpf_attr_size(void)
{
if (test__start_subtest("query_size_boundaries"))
test_query_size_boundaries();
if (test__start_subtest("map_info_tail_zero"))
test_map_info_tail_zero();
if (test__start_subtest("prog_info_tail_zero"))
test_prog_info_tail_zero();
}
Annotation
- Immediate include surface: `linux/bpf.h`, `unistd.h`, `sys/syscall.h`, `test_progs.h`, `cgroup_helpers.h`, `cgroup_skb_direct_packet_access.skel.h`.
- Detected declarations: `struct bpf_map_info_fake`, `struct bpf_prog_info_fake`, `function test_query_size_boundaries`, `function test_map_info_tail_zero`, `function test_prog_info_tail_zero`, `function test_bpf_attr_size`.
- Atlas domain: Support Tooling And Documentation / tools.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.