samples/bpf/fds_example.c

File Facts

System

Linux kernel

Corpus path

samples/bpf/fds_example.c

Extension

.c

Size

4453 bytes

Lines

196

Domain

Support Tooling And Documentation

Bucket

samples

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/unistd.h
• linux/bpf.h
• stdio.h
• stdlib.h
• stdint.h
• unistd.h
• string.h
• assert.h
• errno.h
• sys/types.h
• sys/socket.h
• bpf/bpf.h
• bpf/libbpf.h
• bpf_insn.h
• sock_example.h
• bpf_util.h

Detected Declarations

• function usage
• function bpf_prog_create
• function bpf_do_map
• function bpf_do_prog
• function main

Annotated Snippet

switch (opt) {
		/* General args */
		case 'F':
			file = optarg;
			break;
		case 'P':
			flags |= BPF_F_PIN;
			break;
		case 'G':
			flags |= BPF_F_GET;
			break;
		/* Map-related args */
		case 'm':
			mode = BPF_M_MAP;
			break;
		case 'k':
			key = strtoul(optarg, NULL, 0);
			flags |= BPF_F_KEY;
			break;
		case 'v':
			value = strtoul(optarg, NULL, 0);
			flags |= BPF_F_VAL;
			break;
		/* Prog-related args */
		case 'p':
			mode = BPF_M_PROG;
			break;
		case 'o':
			object = optarg;
			break;
		default:
			goto out;
		}
	}

	if (!(flags & BPF_F_PIN_GET) || !file)
		goto out;

	switch (mode) {
	case BPF_M_MAP:
		return bpf_do_map(file, flags, key, value);
	case BPF_M_PROG:
		return bpf_do_prog(file, flags, object);
	}
out:
	usage();
	return -1;
}

Annotation

• Immediate include surface: `linux/unistd.h`, `linux/bpf.h`, `stdio.h`, `stdlib.h`, `stdint.h`, `unistd.h`, `string.h`, `assert.h`.
• Detected declarations: `function usage`, `function bpf_prog_create`, `function bpf_do_map`, `function bpf_do_prog`, `function main`.
• Atlas domain: Support Tooling And Documentation / samples.
• 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.