tools/testing/selftests/timens/timens.h

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/timens/timens.h

Extension

.h

Size

2323 bytes

Lines

112

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

• fcntl.h
• unistd.h
• stdlib.h
• stdbool.h
• kselftest.h

Detected Declarations

• function check_supported_timers
• function check_skip
• function unshare_timens
• function _settime
• function _gettime
• function nscheck

Annotated Snippet

if (clock_gettime(clk_id, res)) {
			pr_perror("clock_gettime(%d)", (int)clk_id);
			return -1;
		}
		return 0;
	}

	err = syscall(SYS_clock_gettime, clk_id, res);
	if (err)
		pr_perror("syscall(SYS_clock_gettime(%d))", (int)clk_id);

	return err;
}

static inline void nscheck(void)
{
	if (access("/proc/self/ns/time", F_OK) < 0)
		ksft_exit_skip("Time namespaces are not supported\n");
}

#endif

Annotation

• Immediate include surface: `fcntl.h`, `unistd.h`, `stdlib.h`, `stdbool.h`, `kselftest.h`.
• Detected declarations: `function check_supported_timers`, `function check_skip`, `function unshare_timens`, `function _settime`, `function _gettime`, `function nscheck`.
• 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.