tools/leds/led_hw_brightness_mon.c

File Facts

System

Linux kernel

Corpus path

tools/leds/led_hw_brightness_mon.c

Extension

.c

Size

1826 bytes

Lines

86

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

• errno.h
• fcntl.h
• poll.h
• stdio.h
• stdlib.h
• string.h
• time.h
• unistd.h
• linux/uleds.h

Detected Declarations

• function main

Annotated Snippet

if (ret == -1) {
			printf("Failed to poll %s file (%d)\n",
				brightness_file_path, ret);
			ret = 1;
			break;
		}

		clock_gettime(CLOCK_MONOTONIC, &ts);

		ret = read(fd, buf, sizeof(buf));
		if (ret < 0)
			break;

		ret = lseek(pollfd.fd, 0, SEEK_SET);
		if (ret < 0) {
			printf("lseek failed (%d)\n", ret);
			break;
		}

		printf("[%ld.%09ld] %d\n", ts.tv_sec, ts.tv_nsec, atoi(buf));
	}

	close(fd);

	return ret;
}

Annotation

• Immediate include surface: `errno.h`, `fcntl.h`, `poll.h`, `stdio.h`, `stdlib.h`, `string.h`, `time.h`, `unistd.h`.
• Detected declarations: `function main`.
• 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.