Structures (or “structs” in C) allow you to group several related variables and treat them as one unit. They are a mechanism for extending the type system of the C language by introducing user-defined ...

If you allocated this structure the usual way, you'd see Here, body is zero-length. You can't legally access any memory at body. In fact, on Linux/x86-32 this structure is just 12 bytes in length ...

Applications use struct in_addr to store the binary representation of an IP address. Struct in_addr is declared in the header as follows: struct { union { struct ...