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res_state.h
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#ifndef __res_state_defined #define __res_state_defined 1 #include <sys/types.h> #include <netinet/in.h> /* res_state: the global state used by the resolver stub. */ #define MAXNS 3 /* max # name servers we'll track */ #define MAXDFLSRCH 3 /* # default domain levels to try */ #define MAXDNSRCH 6 /* max # domains in search path */ #define MAXRESOLVSORT 10 /* number of net to sort on */ struct __res_state { int retrans; /* retransmition time interval */ int retry; /* number of times to retransmit */ unsigned long options; /* option flags - see below. */ int nscount; /* number of name servers */ struct sockaddr_in nsaddr_list[MAXNS]; /* address of name server */ unsigned short id; /* current message id */ /* 2 byte hole here. */ char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */ char defdname[256]; /* default domain (deprecated) */ unsigned long pfcode; /* RES_PRF_ flags - see below. */ unsigned ndots:4; /* threshold for initial abs. query */ unsigned nsort:4; /* number of elements in sort_list[] */ unsigned ipv6_unavail:1; /* connecting to IPv6 server failed */ unsigned unused:23; struct { struct in_addr addr; uint32_t mask; } sort_list[MAXRESOLVSORT]; /* 4 byte hole here on 64-bit architectures. */ void * __glibc_unused_qhook; void * __glibc_unused_rhook; int res_h_errno; /* last one set for this context */ int _vcsock; /* PRIVATE: for res_send VC i/o */ unsigned int _flags; /* PRIVATE: see below */ /* 4 byte hole here on 64-bit architectures. */ union { char pad[52]; /* On an i386 this means 512b total. */ struct { uint16_t nscount; uint16_t nsmap[MAXNS]; int nssocks[MAXNS]; uint16_t nscount6; uint16_t nsinit; struct sockaddr_in6 *nsaddrs[MAXNS]; #ifdef _LIBC unsigned long long int __glibc_extension_index __attribute__((packed)); #else unsigned int __glibc_reserved[2]; #endif } _ext; } _u; }; typedef struct __res_state *res_state; #endif /* __res_state_defined */