哪个Linux标头文件包含“ struct iface”的定义？

Question

In /usr/include/net/if.h on linux struct iface is mentioned as a Back pointer to Interface in ifaddr structure, but i can't get the header file defining this structure.

Please help me if anyone knows !!!

Answer 1

好吧，看起来它只是保留在结构中的旧代码以保持其结构。

Answer 2

struct ifaddr is of incomplete type, which means that the code would compile, but if you de-reference the pointer to struct iface , or make any other assignments, it would give an error. As said earlier, struct iface is kept in the main structure for legacy reasons only.

struct ifaddr
  {
    struct sockaddr ifa_addr;   /* Address of interface.  */
    union
      {
        struct sockaddr ifu_broadaddr;
        struct sockaddr ifu_dstaddr;
      } ifa_ifu;
    struct iface *ifa_ifp;      /* Back-pointer to interface.  */
        struct manav p[8];
    struct ifaddr *ifa_next;    /* Next address for interface.  */
  };

See also: dereferencing pointer to incomplete type