netdb.h

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   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct protoent *getprotoent (void);

/* Return entry from protocol data base for network with NAME.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct protoent *getprotobyname (__const char *__name);

/* Return entry from protocol data base which number is PROTO.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct protoent *getprotobynumber (int __proto);


#ifdef	__USE_MISC
/* Reentrant versions of the functions above.  The additional
   arguments specify a buffer of BUFLEN starting at BUF.

   These functions are not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation they are cancellation points and
   therefore not marked with __THROW.  */
extern int getprotoent_r (struct protoent *__restrict __result_buf,
			  char *__restrict __buf, size_t __buflen,
			  struct protoent **__restrict __result);

extern int getprotobyname_r (__const char *__restrict __name,
			     struct protoent *__restrict __result_buf,
			     char *__restrict __buf, size_t __buflen,
			     struct protoent **__restrict __result);

extern int getprotobynumber_r (int __proto,
			       struct protoent *__restrict __result_buf,
			       char *__restrict __buf, size_t __buflen,
			       struct protoent **__restrict __result);


/* Establish network group NETGROUP for enumeration.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int setnetgrent (__const char *__netgroup);

/* Free all space allocated by previous `setnetgrent' call.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern void endnetgrent (void);

/* Get next member of netgroup established by last `setnetgrent' call
   and return pointers to elements in HOSTP, USERP, and DOMAINP.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int getnetgrent (char **__restrict __hostp,
			char **__restrict __userp,
			char **__restrict __domainp);


/* Test whether NETGROUP contains the triple (HOST,USER,DOMAIN).

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int innetgr (__const char *__netgroup, __const char *__host,
		    __const char *__user, __const char *domain);

/* Reentrant version of `getnetgrent' where result is placed in BUFFER.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int getnetgrent_r (char **__restrict __hostp,
			  char **__restrict __userp,
			  char **__restrict __domainp,
			  char *__restrict __buffer, size_t __buflen);
#endif	/* misc */


#ifdef __USE_BSD
/* Call `rshd' at port RPORT on remote machine *AHOST to execute CMD.
   The local user is LOCUSER, on the remote machine the command is
   executed as REMUSER.  In *FD2P the descriptor to the socket for the
   connection is returned.  The caller must have the right to use a
   reserved port.  When the function returns *AHOST contains the
   official host name.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int rcmd (char **__restrict __ahost, unsigned short int __rport,
		 __const char *__restrict __locuser,
		 __const char *__restrict __remuser,
		 __const char *__restrict __cmd, int *__restrict __fd2p);

/* This is the equivalent function where the protocol can be selected
   and which therefore can be used for IPv6.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int rcmd_af (char **__restrict __ahost, unsigned short int __rport,
		    __const char *__restrict __locuser,
		    __const char *__restrict __remuser,
		    __const char *__restrict __cmd, int *__restrict __fd2p,
		    sa_family_t __af);

/* Call `rexecd' at port RPORT on remote machine *AHOST to execute
   CMD.  The process runs at the remote machine using the ID of user
   NAME whose cleartext password is PASSWD.  In *FD2P the descriptor
   to the socket for the connection is returned.  When the function
   returns *AHOST contains the official host name.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int rexec (char **__restrict __ahost, int __rport,
		  __const char *__restrict __name,
		  __const char *__restrict __pass,
		  __const char *__restrict __cmd, int *__restrict __fd2p);

/* This is the equivalent function where the protocol can be selected
   and which therefore can be used for IPv6.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int rexec_af (char **__restrict __ahost, int __rport,
		     __const char *__restrict __name,
		     __const char *__restrict __pass,
		     __const char *__restrict __cmd, int *__restrict __fd2p,
		     sa_family_t __af);

/* Check whether user REMUSER on system RHOST is allowed to login as LOCUSER.
   If SUSER is not zero the user tries to become superuser.  Return 0 if
   it is possible.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int ruserok (__const char *__rhost, int __suser,
		    __const char *__remuser, __const char *__locuser);

/* This is the equivalent function where the protocol can be selected
   and which therefore can be used for IPv6.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int ruserok_af (__const char *__rhost, int __suser,
		       __const char *__remuser, __const char *__locuser,
		       sa_family_t __af);

/* Try to allocate reserved port, returning a descriptor for a socket opened
   at this port or -1 if unsuccessful.  The search for an available port
   will start at ALPORT and continues with lower numbers.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int rresvport (int *__alport);

/* This is the equivalent function where the protocol can be selected
   and which therefore can be used for IPv6.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int rresvport_af (int *__alport, sa_family_t __af);
#endif


/* Extension from POSIX.1g.  */
#ifdef	__USE_POSIX
/* Structure to contain information about address of a service provider.  */
struct addrinfo
{
  int ai_flags;			/* Input flags.  */
  int ai_family;		/* Protocol family for socket.  */
  int ai_socktype;		/* Socket type.  */
  int ai_protocol;		/* Protocol for socket.  */
  socklen_t ai_addrlen;		/* Length of socket address.  */
  struct sockaddr *ai_addr;	/* Socket address for socket.  */
  char *ai_canonname;		/* Canonical name for service location.  */
  struct addrinfo *ai_next;	/* Pointer to next in list.  */
};

# ifdef __USE_GNU
/* Structure used as control block for asynchronous lookup.  */
struct gaicb
{
  const char *ar_name;		/* Name to look up.  */
  const char *ar_service;	/* Service name.  */
  const struct addrinfo *ar_request; /* Additional request specification.  */
  struct addrinfo *ar_result;	/* Pointer to result.  */
  /* The following are internal elements.  */
  int __return;
  int __unused[5];
};

/* Lookup mode.  */
#  define GAI_WAIT	0
#  define GAI_NOWAIT	1
# endif

/* Possible values for `ai_flags' field in `addrinfo' structure.  */
# define AI_PASSIVE	0x0001	/* Socket address is intended for `bind'.  */
# define AI_CANONNAME	0x0002	/* Request for canonical name.  */
# define AI_NUMERICHOST	0x0004	/* Don't use name resolution.  */
# define AI_V4MAPPED	0x0008	/* IPv4 mapped addresses are acceptable.  */
# define AI_ALL		0x0010	/* Return IPv4 mapped and IPv6 addresses.  */
# define AI_ADDRCONFIG	0x0020	/* Use configuration of this host to choose
				   returned address type..  */
# ifdef __USE_GNU
#  define AI_IDN	0x0040	/* IDN encode input (assuming it is encoded
				   in the current locale's character set)
				   before looking it up. */
#  define AI_CANONIDN	0x0080	/* Translate canonical name from IDN format. */
#  define AI_IDN_ALLOW_UNASSIGNED 0x0100 /* Don't reject unassigned Unicode
					    code points.  */
#  define AI_IDN_USE_STD3_ASCII_RULES 0x0200 /* Validate strings according to
						STD3 rules.  */
# endif
# define AI_NUMERICSERV	0x0400	/* Don't use name resolution.  */

/* Error values for `getaddrinfo' function.  */
# define EAI_BADFLAGS	  -1	/* Invalid value for `ai_flags' field.  */
# define EAI_NONAME	  -2	/* NAME or SERVICE is unknown.  */
# define EAI_AGAIN	  -3	/* Temporary failure in name resolution.  */
# define EAI_FAIL	  -4	/* Non-recoverable failure in name res.  */
# define EAI_NODATA	  -5	/* No address associated with NAME.  */
# define EAI_FAMILY	  -6	/* `ai_family' not supported.  */
# define EAI_SOCKTYPE	  -7	/* `ai_socktype' not supported.  */
# define EAI_SERVICE	  -8	/* SERVICE not supported for `ai_socktype'.  */
# define EAI_ADDRFAMILY	  -9	/* Address family for NAME not supported.  */
# define EAI_MEMORY	  -10	/* Memory allocation failure.  */
# define EAI_SYSTEM	  -11	/* System error returned in `errno'.  */
# define EAI_OVERFLOW	  -12	/* Argument buffer overflow.  */
# ifdef __USE_GNU
#  define EAI_INPROGRESS  -100	/* Processing request in progress.  */
#  define EAI_CANCELED	  -101	/* Request canceled.  */
#  define EAI_NOTCANCELED -102	/* Request not canceled.  */
#  define EAI_ALLDONE	  -103	/* All requests done.  */
#  define EAI_INTR	  -104	/* Interrupted by a signal.  */
#  define EAI_IDN_ENCODE  -105	/* IDN encoding failed.  */
# endif

# define NI_MAXHOST      1025
# define NI_MAXSERV      32

# define NI_NUMERICHOST	1	/* Don't try to look up hostname.  */
# define NI_NUMERICSERV 2	/* Don't convert port number to name.  */
# define NI_NOFQDN	4	/* Only return nodename portion.  */
# define NI_NAMEREQD	8	/* Don't return numeric addresses.  */
# define NI_DGRAM	16	/* Look up UDP service rather than TCP.  */
# ifdef __USE_GNU
#  define NI_IDN	32	/* Convert name from IDN format.  */
#  define NI_IDN_ALLOW_UNASSIGNED 64 /* Don't reject unassigned Unicode
					code points.  */
#  define NI_IDN_USE_STD3_ASCII_RULES 128 /* Validate strings according to
					     STD3 rules.  */
# endif

/* Translate name of a service location and/or a service name to set of
   socket addresses.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern int getaddrinfo (__const char *__restrict __name,
			__const char *__restrict __service,
			__const struct addrinfo *__restrict __req,
			struct addrinfo **__restrict __pai);

/* Free `addrinfo' structure AI including associated storage.  */
extern void freeaddrinfo (struct addrinfo *__ai) __THROW;

/* Convert error return from getaddrinfo() to a string.  */
extern __const char *gai_strerror (int __ecode) __THROW;

/* Translate a socket address to a location and service name.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern int getnameinfo (__const struct sockaddr *__restrict __sa,
			socklen_t __salen, char *__restrict __host,
			socklen_t __hostlen, char *__restrict __serv,
			socklen_t __servlen, unsigned int __flags);
#endif	/* POSIX */

#ifdef __USE_GNU
/* Enqueue ENT requests from the LIST.  If MODE is GAI_WAIT wait until all
   requests are handled.  If WAIT is GAI_NOWAIT return immediately after
   queueing the requests and signal completion according to SIG.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int getaddrinfo_a (int __mode, struct gaicb *__list[__restrict_arr],
			  int __ent, struct sigevent *__restrict __sig);

/* Suspend execution of the thread until at least one of the ENT requests
   in LIST is handled.  If TIMEOUT is not a null pointer it specifies the
   longest time the function keeps waiting before returning with an error.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int gai_suspend (__const struct gaicb *__const __list[], int __ent,
			__const struct timespec *__timeout);

/* Get the error status of the request REQ.  */
extern int gai_error (struct gaicb *__req) __THROW;

/* Cancel the requests associated with GAICBP.  */
extern int gai_cancel (struct gaicb *__gaicbp) __THROW;
#endif	/* GNU */

__END_DECLS

#endif	/* netdb.h */