socket.h

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#ifndef _UAPI_LINUX_SOCKET_H
#define _UAPI_LINUX_SOCKET_H

/*
 * Desired design of maximum size and alignment (see RFC2553)
 */
#define _K_SS_MAXSIZE   128 /* Implementation specific max size */
#define _K_SS_ALIGNSIZE (__alignof__ (struct sockaddr *))
                /* Implementation specific desired alignment */

typedef unsigned short __kernel_sa_family_t;

struct __kernel_sockaddr_storage {
    __kernel_sa_family_t    ss_family;      /* address family */
    /* Following field(s) are implementation specific */
    char        __data[_K_SS_MAXSIZE - sizeof(unsigned short)];
                /* space to achieve desired size, */
                /* _SS_MAXSIZE value minus size of ss_family */
} __attribute__ ((aligned(_K_SS_ALIGNSIZE)));   /* force desired alignment */

#endif /* _UAPI_LINUX_SOCKET_H */