3.1.6   Les adressages

• Une structure compatible par famille.
• Exemple : Famille PF_UNIX :
  
  Fichier d'inclusion <sys/un.h>

  struct sockaddr_un {
    unsigned short int sun_family;
    char sun_path[UNIX_PATH_MAX]];
  };
  

• Exemple : Famille PF_INET :
  
  Fichier d'inclusion <netinet/in.h>

  struct in_addr { unsigned int s_addr; };
  
  struct sockaddr_in {
    unsigned short int sin_family;
    unsigned short int sin_port;
    struct in_addr sin_addr;
    unsigned char sin_zero[8];
  };
  

• Exemple : Famille PF_INET6 :
  
  Fichier d'inclusion <netinet/in6.h>

  struct in6_addr {
    union {
      unsigned char u6_addr8[16];
      unsigned short int u6_addr16[8];
      unsigned int u6_addr32[4];
      } in6_u;
  #define s6_addr     in6_u.u6_addr8
  #define s6_addr16   in6_u.u6_addr16
  #define s6_addr32   in6_u.u6_addr32
    }; 
  
  struct sockaddr_in6 {
    unsigned short int sin6_family;
    unsigned short int sin6_port;
    unsigned int sin6_flowlabel;
    struct in6_addr sin6_addr;
    unsigned int sin6_scope_id;};