27 Input/output library [input.output]

27.10 File systems [filesystems]

27.10.10 Enumerations [fs.enum]

27.10.10.3 Enum class perms [enum.perms]

1

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 [tab:enum.perms].

Table 124 — Enum class perms
NameValuePOSIXDefinition 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
add_perms 0x10000 permissions() shall bitwise or the perm argument's permission bits to the file's current permission bits.
remove_perms 0x20000 permissions() shall bitwise and the complement of perm argument's permission bits to the file's current permission bits.
symlink_nofollow 0x40000 permissions() shall change the permissions of symbolic links.