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The
and functions each return a pointer to an object with the following
structure containing the broken-out fields of a line in the network services
data base, struct servent { char *s_name; /* official name of service */
char **s_aliases; /* alias list */
int s_port; /* port service resides at */
char *s_proto; /* protocol to use */
}; The members of this structure are: The official name of the service.
A zero terminated list of alternate names for the service. The port number
at which the service resides. Port numbers are returned in network byte
order. The name of the protocol to use when contacting the service. The
function reads the next line of the file, opening the file if necessary.
The function opens and rewinds the file. If the flag is non-zero, the
net data base will not be closed after each call to or The function
closes the file. The and functions sequentially search from the beginning
of the file until a matching protocol name or port number is found, or
until is encountered. If a protocol name is also supplied (non- searches
must also match the protocol.
Null pointer (0) returned
on or error.
The and functions appeared in
These
functions use static data storage; if the data is needed for future use,
it should be copied before any subsequent calls overwrite it. Expecting
port numbers to fit in a 32 bit quantity is probably naive.
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