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Pinned structs is a convenient way to write struct types where the offset of all its fields is zero. They are equivalent to C unions.
For example, consider the _u
field below in a CTF type
description:
type Ctf_Stype_V1 = struct { Ctf_Name ctt_name; Ctf_Info_V1 ctt_info; pinned struct { uint32 _size; /* Size of entire type in bytes. */ uint32 _type; /* Reference to another type. */ } _u; };
Note that integral structs cannot be pinned. See Integral Structs. And field labels are not allowed in pinned structs.