tools/testing/selftests/memfd/common.c

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/memfd/common.c

Extension

.c

Size

814 bytes

Lines

47

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.

Dependency Surface

• stdio.h
• stdlib.h
• linux/fcntl.h
• linux/memfd.h
• unistd.h
• sys/syscall.h
• common.h

Detected Declarations

• function default_huge_page_size
• function sys_memfd_create

Annotated Snippet

if (sscanf(line, "Hugepagesize:       %lu kB", &hps) == 1) {
			hps <<= 10;
			break;
		}
	}

	free(line);
	fclose(f);
	return hps;
}

int sys_memfd_create(const char *name, unsigned int flags)
{
	if (hugetlbfs_test)
		flags |= MFD_HUGETLB;

	return syscall(__NR_memfd_create, name, flags);
}

Annotation

• Immediate include surface: `stdio.h`, `stdlib.h`, `linux/fcntl.h`, `linux/memfd.h`, `unistd.h`, `sys/syscall.h`, `common.h`.
• Detected declarations: `function default_huge_page_size`, `function sys_memfd_create`.
• 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.