tools/testing/selftests/bpf/progs/test_ns_current_pid_tgid.c
Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/test_ns_current_pid_tgid.c
File Facts
- System
- Linux kernel
- Corpus path
tools/testing/selftests/bpf/progs/test_ns_current_pid_tgid.c- Extension
.c- Size
- 936 bytes
- Lines
- 53
- 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.hstdint.hbpf/bpf_helpers.h
Detected Declarations
function get_pid_tgidfunction tp_handlerfunction cgroup_bind4function sk_msg
Annotated Snippet
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Carlos Neira cneirabustos@gmail.com */
#include <linux/bpf.h>
#include <stdint.h>
#include <bpf/bpf_helpers.h>
struct {
__uint(type, BPF_MAP_TYPE_SOCKMAP);
__uint(max_entries, 2);
__type(key, __u32);
__type(value, __u32);
} sock_map SEC(".maps");
__u64 user_pid = 0;
__u64 user_tgid = 0;
__u64 dev = 0;
__u64 ino = 0;
static void get_pid_tgid(void)
{
struct bpf_pidns_info nsdata;
if (bpf_get_ns_current_pid_tgid(dev, ino, &nsdata, sizeof(struct bpf_pidns_info)))
return;
user_pid = nsdata.pid;
user_tgid = nsdata.tgid;
}
SEC("?tracepoint/syscalls/sys_enter_nanosleep")
int tp_handler(const void *ctx)
{
get_pid_tgid();
return 0;
}
SEC("?cgroup/bind4")
int cgroup_bind4(struct bpf_sock_addr *ctx)
{
get_pid_tgid();
return 1;
}
SEC("?sk_msg")
int sk_msg(struct sk_msg_md *msg)
{
get_pid_tgid();
return SK_PASS;
}
char _license[] SEC("license") = "GPL";
Annotation
- Immediate include surface: `linux/bpf.h`, `stdint.h`, `bpf/bpf_helpers.h`.
- Detected declarations: `function get_pid_tgid`, `function tp_handler`, `function cgroup_bind4`, `function sk_msg`.
- 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.