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Man Pages

Subroutines
Browse in : All > Documents > Man Pages > Subroutines (8513)

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)
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