samples/vfs/test-statx.c

Source file repositories/reference/linux-study-clean/samples/vfs/test-statx.c

File Facts

System
Linux kernel
Corpus path
samples/vfs/test-statx.c
Extension
.c
Size
6795 bytes
Lines
272
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.

Dependency Surface

Detected Declarations

Annotated Snippet

switch (stx->stx_mode & S_IFMT) {
		case S_IFIFO:	printf("  FIFO\n");			ft = 'p'; break;
		case S_IFCHR:	printf("  character special file\n");	ft = 'c'; break;
		case S_IFDIR:	printf("  directory\n");		ft = 'd'; break;
		case S_IFBLK:	printf("  block special file\n");	ft = 'b'; break;
		case S_IFREG:	printf("  regular file\n");		ft = '-'; break;
		case S_IFLNK:	printf("  symbolic link\n");		ft = 'l'; break;
		case S_IFSOCK:	printf("  socket\n");			ft = 's'; break;
		default:
			printf(" unknown type (%o)\n", stx->stx_mode & S_IFMT);
			break;
		}
	} else {
		printf(" no type\n");
	}

	sprintf(buffer, "%02x:%02x", stx->stx_dev_major, stx->stx_dev_minor);
	printf("Device: %-15s", buffer);
	if (stx->stx_mask & STATX_INO)
		printf(" Inode: %-11llu", (unsigned long long) stx->stx_ino);
	if (stx->stx_mask & STATX_NLINK)
		printf(" Links: %-5u", stx->stx_nlink);
	if (stx->stx_mask & STATX_TYPE) {
		switch (stx->stx_mode & S_IFMT) {
		case S_IFBLK:
		case S_IFCHR:
			printf(" Device type: %u,%u",
			       stx->stx_rdev_major, stx->stx_rdev_minor);
			break;
		}
	}
	printf("\n");

	if (stx->stx_mask & STATX_MODE)
		printf("Access: (%04o/%c%c%c%c%c%c%c%c%c%c)  ",
		       stx->stx_mode & 07777,
		       ft,
		       stx->stx_mode & S_IRUSR ? 'r' : '-',
		       stx->stx_mode & S_IWUSR ? 'w' : '-',
		       stx->stx_mode & S_IXUSR ? 'x' : '-',
		       stx->stx_mode & S_IRGRP ? 'r' : '-',
		       stx->stx_mode & S_IWGRP ? 'w' : '-',
		       stx->stx_mode & S_IXGRP ? 'x' : '-',
		       stx->stx_mode & S_IROTH ? 'r' : '-',
		       stx->stx_mode & S_IWOTH ? 'w' : '-',
		       stx->stx_mode & S_IXOTH ? 'x' : '-');
	if (stx->stx_mask & STATX_UID)
		printf("Uid: %5d   ", stx->stx_uid);
	if (stx->stx_mask & STATX_GID)
		printf("Gid: %5d\n", stx->stx_gid);

	if (stx->stx_mask & STATX_ATIME)
		print_time("Access: ", &stx->stx_atime);
	if (stx->stx_mask & STATX_MTIME)
		print_time("Modify: ", &stx->stx_mtime);
	if (stx->stx_mask & STATX_CTIME)
		print_time("Change: ", &stx->stx_ctime);
	if (stx->stx_mask & STATX_BTIME)
		print_time(" Birth: ", &stx->stx_btime);

	if (stx->stx_attributes_mask) {
		unsigned char bits, mbits;
		int loop, byte;

		static char attr_representation[64 + 1] =
			/* STATX_ATTR_ flags: */
			"????????"	/* 63-56 */
			"????????"	/* 55-48 */
			"????????"	/* 47-40 */
			"????????"	/* 39-32 */
			"????????"	/* 31-24	0x00000000-ff000000 */
			"????????"	/* 23-16	0x00000000-00ff0000 */
			"???me???"	/* 15- 8	0x00000000-0000ff00 */
			"?dai?c??"	/*  7- 0	0x00000000-000000ff */
			;

		printf("Attributes: %016llx (",
		       (unsigned long long)stx->stx_attributes);
		for (byte = 64 - 8; byte >= 0; byte -= 8) {
			bits = stx->stx_attributes >> byte;
			mbits = stx->stx_attributes_mask >> byte;
			for (loop = 7; loop >= 0; loop--) {
				int bit = byte + loop;

				if (!(mbits & 0x80))
					putchar('.');	/* Not supported */
				else if (bits & 0x80)
					putchar(attr_representation[63 - bit]);
				else
					putchar('-');	/* Not set */

Annotation

Implementation Notes