netdb.h

#pragma once
 
#include <netinet/in.h>
 
#define HOST_NOT_FOUND  1
#define NO_DATA     2
#define NO_ADDRESS  NO_DATA
#define NO_RECOVERY 3
#define TRY_AGAIN   4
 
struct hostent {
  char     *h_name;        /* official name of host */
  char     **h_aliases;    /* alias list */
  uint16_t h_addrtype;     /* host address type */
  uint16_t h_length;       /* length of address */
  char     **h_addr_list;  /* list of addresses from name server */
};
#define h_addr h_addr_list[0] /* for backward compatibility */
 
#define AI_PASSIVE     0x01
#define AI_CANONNAME   0x02
#define AI_NUMERICHOST 0x04
#define AI_NUMERICSERV 0x00 /* probably 0x08 but services names are never resolved */
 
// doesn't apply to 3ds
#define AI_ADDRCONFIG  0x00
 
 
#define NI_MAXHOST     1025
#define NI_MAXSERV       32
 
#define NI_NOFQDN      0x01
#define NI_NUMERICHOST 0x02
#define NI_NAMEREQD    0x04
#define NI_NUMERICSERV 0x00 /* probably 0x08 but services names are never resolved */
#define NI_DGRAM       0x00 /* probably 0x10 but services names are never resolved */
 
#define EAI_FAMILY   (-303)
#define EAI_MEMORY   (-304)
#define EAI_NONAME   (-305)
#define EAI_SOCKTYPE (-307)
 
struct addrinfo {
    int             ai_flags;
    int             ai_family;
    int             ai_socktype;
    int             ai_protocol;
    socklen_t       ai_addrlen;
    char            *ai_canonname;
    struct sockaddr *ai_addr;
    struct addrinfo *ai_next;
};
 
#ifdef __cplusplus
extern "C" {
#endif
 
    extern int  h_errno;
    struct hostent* gethostbyname(const char *name);
    struct hostent* gethostbyaddr(const void *addr, socklen_t len, int type);
    void        herror(const char *s);
    const char* hstrerror(int err);
 
    int getnameinfo(const struct sockaddr *sa, socklen_t salen,
        char *host, socklen_t hostlen,
        char *serv, socklen_t servlen, int flags);
 
    int getaddrinfo(const char *node, const char *service,
        const struct addrinfo *hints,
        struct addrinfo **res);
 
    void freeaddrinfo(struct addrinfo *ai);
 
    const char *gai_strerror(int ecode);
#ifdef __cplusplus
}
#endif