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netdb.h(3head) [sunos man page]

netdb.h(3HEAD)							      Headers							    netdb.h(3HEAD)

NAME
netdb.h, netdb - definitions for network database operations SYNOPSIS
#include <netdb.h> DESCRIPTION
The <netdb.h> header defines the type in_port_t and the type in_addr_t as described in in.h(3HEAD). The <netdb.h> header defines the hostent structure that includes the following members: char *h_name /* official name of the host */ char **h_aliases /* pointer to an array of pointers to alternative */ /* host names, terminated by a null pointer */ int h_addrtype /* address type */ int h_length /* length, in bytes, of the address */ char **h_addr_list /* pointer to an array of pointers to network addresses */ /* (in network byte order) for the host, terminated by a */ /* null pointer */ The <netdb.h> header defines the netent structure that includes the following members: char *n_name /* official, fully-qualified (including the domain) name */ /* of the network */ char **n_aliases /* pointer to an array of pointers to alternative */ /* network names, terminated by a null pointer */ int n_addrtype /* the address type of the network */ in_addr_t n_net /* the network number, in host byte order */ The <netdb.h> header defines the protoent structure that includes the following members: char *p_name /* official name of the protocol */ char **p_aliases /* pointer to an array of pointers to alternative */ /* protocol names, terminated by a null pointer */ int p_proto /* protocol number */ The <netdb.h> header defines the servent structure that includes the following members: char *s_name /* fficial name of the service */ char **s_aliases /* pointer to an array of pointers to alternative */ /* service names, terminated by a null pointer */ int s_port /* port number at which the service resides, */ /* in network byte order */ char *s_proto /* name of the protocol to use when */ /* contacting the service */ The <netdb.h> header defines the macro IPPORT_RESERVED with the value of the highest reserved Internet port number. The <netdb.h> header provides a declaration for h_errno: extern int h_errno; The <netdb.h> header defines the following macros for use as error values for gethostbyaddr() and gethostbyname(): HOST_NOT_FOUND NO_DATA NO_RECOVERY TRY_AGAIN Inclusion of the <netdb.h> header may also make visible all symbols from in.h(3HEAD). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
intro(3), endhostent(3NSL), endhostent(3XNET), endnetent(3SOCKET), endnetent(3XNET), endprotoent(3SOCKET), endprotoent(3XNET), endser- vent(3SOCKET), endservent(3XNET), in.h(3HEAD), attributes(5), standards(5) SunOS 5.10 10 Sep 2004 netdb.h(3HEAD)

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GETNETENT(3)						     Linux Programmer's Manual						      GETNETENT(3)

NAME
getnetent, getnetbyname, getnetbyaddr, setnetent, endnetent - get network entry SYNOPSIS
#include <netdb.h> struct netent *getnetent(void); struct netent *getnetbyname(const char *name); struct netent *getnetbyaddr(long net, int type); void setnetent(int stayopen); void endnetent(void); DESCRIPTION
The getnetent() function reads the next line from the file /etc/networks and returns a structure netent containing the broken out fields from the line. The /etc/networks file is opened if necessary. The getnetbyname() function returns a netent structure for the line from /etc/networks that matches the network name. The getnetbyaddr() function returns a netent structure for the line that matches the network number net of type type. The setnetent() function opens and rewinds the /etc/networks file. If stayopen is true (1), then the file will not be closed between calls to getnetbyname() and getnetbyaddr(). The endservent() function closes /etc/networks. The netent structure is defined in <netdb.h> as follows: struct netent { char *n_name; /* official network name */ char **n_aliases; /* alias list */ int n_addrtype; /* net address type */ unsigned long int n_net; /* network number */ } The members of the netent structure are: n_name The official name of the network. n_aliases A zero terminated list of alternative names for the network. n_addrtype The type of the network number; always AF_INET. n_net The network number in host byte order. RETURN VALUE
The getnetent(), getnetbyname() and getnetbyaddr() functions return the netent structure, or a NULL pointer if an error occurs or the end of the file is reached. FILES
/etc/networks networks database file CONFORMING TO
BSD 4.3 SEE ALSO
getprotoent(3), getservent(3), networks(5) RFC 1101 BSD
1993-05-15 GETNETENT(3)
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