res_config.h

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#define DEBUG   1       /* enable debugging code (needed for dig) */
#define RESOLVSORT      /* allow sorting of addresses in gethostbyname */
#define RFC1535         /* comply with RFC1535 (STRONGLY reccomended by vixie)*/
#undef  USELOOPBACK     /* res_init() bind to localhost */
#undef  SUNSECURITY     /* verify gethostbyaddr() calls - WE DONT NEED IT  */
#define MULTI_PTRS_ARE_ALIASES 1 /* fold multiple PTR records into aliases */
#define CHECK_SRVR_ADDR 1 /* confirm that the server requested sent the reply */
#define BIND_UPDATE 1   /* update support */

#if defined(__rtems__)
u_int16_t _getshort(const u_char *src);
u_int32_t _getlong(const u_char *src);
int gethostname (char *name, size_t namelen);
int sethostname (const char *name, size_t namelen);
int issetugid (void);
#endif