GETNETENT Section: Linux Programmer's Manual (3) Updated: May 15, 2025 Index   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 RFC 1101   Index NAME SYNOPSIS DESCRIPTION RETURN VALUE FILES CONFORMING TO SEE ALSO This document was created by using the manual pages. Time: 11:58:05 GMT, March 24, 2025