[fs.enum.perms]

# 31 Input/output library [[input.output]](./#input.output)

## 31.12 File systems [[filesystems]](filesystems#fs.enum.perms)

### 31.12.8 Enumerations [[fs.enum]](fs.enum#perms)

#### 31.12.8.4 Enum class perms [fs.enum.perms]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L15823)

The enum class type perms is a bitmask type ([[bitmask.types]](bitmask.types "16.3.3.3.3 Bitmask types")) that specifies bitmask constants used to identify file
permissions, with the meanings listed in Table [151](#tab:fs.enum.perms "Table 151: Enum class perms")[.](#1.sentence-1)

Table [151](#tab:fs.enum.perms) — Enum class perms [[tab:fs.enum.perms]](./tab:fs.enum.perms)  

| [🔗](#tab:fs.enum.perms-row-1)<br>**Name** | **Value** | **POSIX** | **Definition or notes** |
| --- | --- | --- | --- |
| [🔗](#tab:fs.enum.perms-row-2) | **(octal)** | **macro** |  |
| [🔗](#tab:fs.enum.perms-row-3)<br>[none](#lib:perms,none "31.12.8.4 Enum class perms [fs.enum.perms]") | 0 |  | There are no permissions set for the file[.](#tab:fs.enum.perms-row-3-column-4-sentence-1) |
| [🔗](#tab:fs.enum.perms-row-4)<br>[owner_read](#lib:perms,owner_read "31.12.8.4 Enum class perms [fs.enum.perms]") | 0400 | S_IRUSR | Read permission, owner |
| [🔗](#tab:fs.enum.perms-row-5)<br>[owner_write](#lib:perms,owner_write "31.12.8.4 Enum class perms [fs.enum.perms]") | 0200 | S_IWUSR | Write permission, owner |
| [🔗](#tab:fs.enum.perms-row-6)<br>[owner_exec](#lib:perms,owner_exec "31.12.8.4 Enum class perms [fs.enum.perms]") | 0100 | S_IXUSR | Execute/search permission, owner |
| [🔗](#tab:fs.enum.perms-row-7)<br>[owner_all](#lib:perms,owner_all "31.12.8.4 Enum class perms [fs.enum.perms]") | 0700 | S_IRWXU | Read, write, execute/search by owner;   owner_read | owner_write | owner_exec |
| [🔗](#tab:fs.enum.perms-row-8)<br>[group_read](#lib:perms,group_read "31.12.8.4 Enum class perms [fs.enum.perms]") | 040 | S_IRGRP | Read permission, group |
| [🔗](#tab:fs.enum.perms-row-9)<br>[group_write](#lib:perms,group_write "31.12.8.4 Enum class perms [fs.enum.perms]") | 020 | S_IWGRP | Write permission, group |
| [🔗](#tab:fs.enum.perms-row-10)<br>[group_exec](#lib:perms,group_exec "31.12.8.4 Enum class perms [fs.enum.perms]") | 010 | S_IXGRP | Execute/search permission, group |
| [🔗](#tab:fs.enum.perms-row-11)<br>[group_all](#lib:perms,group_all "31.12.8.4 Enum class perms [fs.enum.perms]") | 070 | S_IRWXG | Read, write, execute/search by group;   group_read | group_write | group_exec |
| [🔗](#tab:fs.enum.perms-row-12)<br>[others_read](#lib:perms,others_read "31.12.8.4 Enum class perms [fs.enum.perms]") | 04 | S_IROTH | Read permission, others |
| [🔗](#tab:fs.enum.perms-row-13)<br>[others_write](#lib:perms,others_write "31.12.8.4 Enum class perms [fs.enum.perms]") | 02 | S_IWOTH | Write permission, others |
| [🔗](#tab:fs.enum.perms-row-14)<br>[others_exec](#lib:perms,others_exec "31.12.8.4 Enum class perms [fs.enum.perms]") | 01 | S_IXOTH | Execute/search permission, others |
| [🔗](#tab:fs.enum.perms-row-15)<br>[others_all](#lib:perms,others_all "31.12.8.4 Enum class perms [fs.enum.perms]") | 07 | S_IRWXO | Read, write, execute/search by others;   others_read | others_write | others_exec |
| [🔗](#tab:fs.enum.perms-row-16)<br>[all](#lib:perms,all "31.12.8.4 Enum class perms [fs.enum.perms]") | 0777 |  | owner_all | group_all | others_all |
| [🔗](#tab:fs.enum.perms-row-17)<br>[set_uid](#lib:perms,set_uid "31.12.8.4 Enum class perms [fs.enum.perms]") | 04000 | S_ISUID | Set-user-ID on execution |
| [🔗](#tab:fs.enum.perms-row-18)<br>[set_gid](#lib:perms,set_gid "31.12.8.4 Enum class perms [fs.enum.perms]") | 02000 | S_ISGID | Set-group-ID on execution |
| [🔗](#tab:fs.enum.perms-row-19)<br>[sticky_bit](#lib:perms,sticky_bit "31.12.8.4 Enum class perms [fs.enum.perms]") | 01000 | S_ISVTX | Operating system dependent[.](#tab:fs.enum.perms-row-19-column-4-sentence-1) |
| [🔗](#tab:fs.enum.perms-row-20)<br>[mask](#lib:perms,mask "31.12.8.4 Enum class perms [fs.enum.perms]") | 07777 |  | all | set_uid | set_gid | sticky_bit |
| [🔗](#tab:fs.enum.perms-row-21)<br>[unknown](#lib:perms,unknown "31.12.8.4 Enum class perms [fs.enum.perms]") | 0xFFFF |  | The permissions are not known, such as when a file_status object  is created without specifying the permissions |