samples/hid/hid_mouse.c

File Facts

System

Linux kernel

Corpus path

samples/hid/hid_mouse.c

Extension

.c

Size

2958 bytes

Lines

139

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

• assert.h
• errno.h
• fcntl.h
• libgen.h
• signal.h
• stdbool.h
• stdio.h
• stdlib.h
• string.h
• sys/resource.h
• unistd.h
• linux/bpf.h
• linux/errno.h
• bpf/bpf.h
• bpf/libbpf.h
• hid_mouse.skel.h

Detected Declarations

• function int_exit
• function usage
• function get_hid_id
• function main

Annotated Snippet

switch (opt) {
		default:
			usage(basename(argv[0]));
			return 1;
		}
	}

	if (optind == argc) {
		usage(basename(argv[0]));
		return 1;
	}

	sysfs_path = argv[optind];
	if (!sysfs_path) {
		perror("sysfs");
		return 1;
	}

	skel = hid_mouse__open();
	if (!skel) {
		fprintf(stderr, "%s  %s:%d", __func__, __FILE__, __LINE__);
		return -1;
	}

	hid_id = get_hid_id(sysfs_path);

	if (hid_id < 0) {
		fprintf(stderr, "can not open HID device: %m\n");
		return 1;
	}
	skel->struct_ops.mouse_invert->hid_id = hid_id;

	err = hid_mouse__load(skel);
	if (err < 0) {
		fprintf(stderr, "can not load HID-BPF program: %m\n");
		return 1;
	}

	link = bpf_map__attach_struct_ops(skel->maps.mouse_invert);
	if (!link) {
		fprintf(stderr, "can not attach HID-BPF program: %m\n");
		return 1;
	}

	signal(SIGINT, int_exit);
	signal(SIGTERM, int_exit);

	while (running)
		sleep(1);

	hid_mouse__destroy(skel);

	return 0;
}

Annotation

• Immediate include surface: `assert.h`, `errno.h`, `fcntl.h`, `libgen.h`, `signal.h`, `stdbool.h`, `stdio.h`, `stdlib.h`.
• Detected declarations: `function int_exit`, `function usage`, `function get_hid_id`, `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.