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GNU/Linux |
CentOS 2.1AS(Slurm) |
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getnetbyname(3) |
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getnetent, getnetbyname, getnetbyaddr, setnetent, endnetent − get network entry
#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);
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 {
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char |
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*n_name; |
/* official network name */ | ||
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char |
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**n_aliases; |
/* alias list */ | ||
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int |
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n_addrtype; |
/* net address type */ | ||
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unsigned long int n_net; |
/* network number */ |
}
The members of the netent structure are:
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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.
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n_net |
The network number in host byte order. |
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.
/etc/networks networks database file
BSD 4.3
getprotoent(3),
getservent(3), networks(5)
RFC 1101
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getnetbyname(3) | |