29 Input/output library [input.output]

29.11 File systems [filesystems]

29.11.9 Enumerations [fs.enum]

29.11.9.1 Enum path::format [fs.enum.path.format]

This enum specifies constants used to identify the format of the character sequence, with the meanings listed in Table 128 .

Table 128: Enum path::format [tab:fs.enum.path.format]

Name	Meaning
native_format	The native pathname format.
generic_format	The generic pathname format.
auto_format	The interpretation of the format of the character sequence is implementation-defined. The implementation may inspect the content of the character sequence to determine the format. [ Note : For POSIX-based systems, native and generic formats are equivalent and the character sequence should always be interpreted in the same way. — end note ]

29.11.9.2 Enum class file_type [fs.enum.file.type]

This enum class specifies constants used to identify file types, with the meanings listed in Table 129 .

The values of the constants are distinct.

Table 129: Enum class file_type [tab:fs.enum.file.type]

Constant	Meaning
none	The type of the file has not been determined or an error occurred while trying to determine the type.
not_found	Pseudo-type indicating the file was not found. [ Note : The file not being found is not considered an error while determining the type of a file. — end note ]
regular	Regular file
directory	Directory file
symlink	Symbolic link file
block	Block special file
character	Character special file
fifo	FIFO or pipe file
socket	Socket file
implementation-defined	Implementations that support file systems having file types in addition to the above file_type types shall supply implementation-defined file_type constants to separately identify each of those additional file types
unknown	The file exists but the type could not be determined

29.11.9.3 Enum class copy_options [fs.enum.copy.opts]

The enum class type copy_options is a bitmask type ([bitmask.types]) that specifies bitmask constants used to control the semantics of copy operations.

The constants are specified in option groups with the meanings listed in Table 130 .

The constant none represents the empty bitmask, and is shown in each option group for purposes of exposition; implementations shall provide only a single definition.

Every other constant in the table represents a distinct bitmask element.

Table 130: Enum class copy_options [tab:fs.enum.copy.opts]

Option group controlling copy_file function effects for existing target files
Constant	Meaning
none	(Default) Error; file already exists.
skip_existing	Do not overwrite existing file, do not report an error.
overwrite_existing	Overwrite the existing file.
update_existing	Overwrite the existing file if it is older than the replacement file.
Option group controlling copy function effects for sub-directories
Constant	Meaning
none	(Default) Do not copy sub-directories.
recursive	Recursively copy sub-directories and their contents.
Option group controlling copy function effects for symbolic links
Constant	Meaning
none	(Default) Follow symbolic links.
copy_symlinks	Copy symbolic links as symbolic links rather than copying the files that they point to.
skip_symlinks	Ignore symbolic links.
Option group controlling copy function effects for choosing the form of copying
Constant	Meaning
none	(Default) Copy content.
directories_only	Copy directory structure only, do not copy non-directory files.
create_symlinks	Make symbolic links instead of copies of files. The source path shall be an absolute path unless the destination path is in the current directory.
create_hard_links	Make hard links instead of copies of files.

29.11.9.4 Enum class perms [fs.enum.perms]

The enum class type perms is a bitmask type ([bitmask.types]) that specifies bitmask constants used to identify file permissions, with the meanings listed in Table 131 .

Table 131: Enum class perms [tab:fs.enum.perms]

Name	Value	POSIX	Definition or notes
	(octal)	macro
none	0		There are no permissions set for the file.
owner_read	0400	S_IRUSR	Read permission, owner
owner_write	0200	S_IWUSR	Write permission, owner
owner_exec	0100	S_IXUSR	Execute/search permission, owner
owner_all	0700	S_IRWXU	Read, write, execute/search by owner; owner_read \| owner_write \| owner_exec
group_read	040	S_IRGRP	Read permission, group
group_write	020	S_IWGRP	Write permission, group
group_exec	010	S_IXGRP	Execute/search permission, group
group_all	070	S_IRWXG	Read, write, execute/search by group; group_read \| group_write \| group_exec
others_read	04	S_IROTH	Read permission, others
others_write	02	S_IWOTH	Write permission, others
others_exec	01	S_IXOTH	Execute/search permission, others
others_all	07	S_IRWXO	Read, write, execute/search by others; others_read \| others_write \| others_exec
all	0777		owner_all \| group_all \| others_all
set_uid	04000	S_ISUID	Set-user-ID on execution
set_gid	02000	S_ISGID	Set-group-ID on execution
sticky_bit	01000	S_ISVTX	Operating system dependent.
mask	07777		all \| set_uid \| set_gid \| sticky_bit
unknown	0xFFFF		The permissions are not known, such as when a file_status object is created without specifying the permissions

29.11.9.5 Enum class perm_options [fs.enum.perm.opts]

The enum class type perm_options is a bitmask type ([bitmask.types]) that specifies bitmask constants used to control the semantics of permissions operations, with the meanings listed in Table 132 .

The bitmask constants are bitmask elements.

In Table 132 perm denotes a value of type perms passed to permissions.

Table 132: Enum class perm_options [tab:fs.enum.perm.opts]

Name	Meaning
replace	permissions shall replace the file's permission bits with perm
add	permissions shall replace the file's permission bits with the bitwise OR of perm and the file's current permission bits.
remove	permissions shall replace the file's permission bits with the bitwise AND of the complement of perm and the file's current permission bits.
nofollow	permissions shall change the permissions of a symbolic link itself rather than the permissions of the file the link resolves to.

29.11.9.6 Enum class directory_options [fs.enum.dir.opts]

The enum class type directory_options is a bitmask type ([bitmask.types]) that specifies bitmask constants used to identify directory traversal options, with the meanings listed in Table 133 .

The constant none represents the empty bitmask; every other constant in the table represents a distinct bitmask element.

Table 133: Enum class directory_options [tab:fs.enum.dir.opts]

Name	Meaning
none	(Default) Skip directory symlinks, permission denied is an error.
follow_directory_symlink	Follow rather than skip directory symlinks.
skip_permission_denied	Skip directories that would otherwise result in permission denied.

29 Input/output library [input.output]

29.11 File systems [filesystems]

29.11.9 Enumerations [fs.enum]

29.11.9.1 Enum path​::​format [fs.enum.path.format]

29.11.9.2 Enum class file_­type [fs.enum.file.type]

29.11.9.3 Enum class copy_­options [fs.enum.copy.opts]