31 Input/output library [input.output]

31.12 File systems [filesystems]

31.12.8 Enumerations [fs.enum]

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

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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 150.
The bitmask constants are bitmask elements.
In Table 150 perm denotes a value of type perms passed to permissions.
Table 150 — Enum class perm_options [tab:fs.enum.perm.opts]
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Name
Meaning
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permissions shall replace the file's permission bits with perm
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permissions shall replace the file's permission bits with the bitwise or of perm and the file's current permission bits.
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permissions shall replace the file's permission bits with the bitwise and of the complement of perm and the file's current permission bits.
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permissions shall change the permissions of a symbolic link itself rather than the permissions of the file the link resolves to.