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+NAME="NET-COMMON-TCPIP-MANPAGES-GETSERVENT">getservent</H1
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+CLASS="SCREEN"
+>GETSERVENT(3) System Library Functions Manual GETSERVENT(3)
+
+NAME
+ getservent, getservbyport, getservbyname, setservent, endservent - get
+ service entry
+
+SYNOPSIS
+ #include <netdb.h>
+
+ struct servent *
+ getservent(void);
+
+ struct servent *
+ getservbyname(char *name, char *proto);
+
+ struct servent *
+ getservbyport(int port, char *proto);
+
+ void
+ setservent(int stayopen);
+
+ void
+ endservent(void);
+
+DESCRIPTION
+ The getservent(), getservbyname(), and getservbyport() functions each
+ return a pointer to an object with the following structure containing the
+ broken-out fields of a line in the network services database,
+ /etc/services.
+
+ 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:
+
+ s_name The official name of the service.
+
+ s_aliases A zero-terminated list of alternate names for the service.
+
+ s_port The port number at which the service resides. Port numbers
+ are returned in network byte order.
+
+ s_proto The name of the protocol to use when contacting the service.
+
+ The getservent() function reads the next line of the file, opening the
+ file if necessary.
+
+ The setservent() function opens and rewinds the file. If the stayopen
+ flag is non-zero, the net database will not be closed after each call to
+ getservbyname() or getservbyport().
+
+ The endservent() function closes the file.
+
+ The getservbyname() and getservbyport() functions sequentially search
+ from the beginning of the file until a matching protocol name or port
+ number (specified in network byte order) is found, or until EOF is
+ encountered. If a protocol name is also supplied (non-null), searches
+ must also match the protocol.
+
+FILES
+ /etc/services
+
+DIAGNOSTICS
+ Null pointer (0) returned on EOF or error.
+
+SEE ALSO
+ getprotoent(3), services(5)
+
+HISTORY
+ The getservent(), getservbyport(), getservbyname(), setservent(), and
+ endservent() functions appeared in 4.2BSD.
+
+BUGS
+ 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.
+
+BSD January 12, 1994 BSD
+ </PRE
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