bsd man page for getservbyname

GETSERVENT(3N)															    GETSERVENT(3N)

NAME
       getservent, getservbyport, getservbyname, setservent, endservent - get service entry

SYNOPSIS
       #include <netdb.h>

       struct servent *getservent()

       struct servent *getservbyname(name, proto)
       char *name, *proto;

       struct servent *getservbyport(port, proto)
       int port; char *proto;

       setservent(stayopen)
       int stayopen

       endservent()

DESCRIPTION
       Getservent,  getservbyname,  and  getservbyport	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, /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.

       Getservent reads the next line of the file, opening the file if necessary.

       Setservent opens and rewinds the file.  If the stayopen flag is non-zero, the net data base will not be closed  after  each  call  to  get-
       servbyname or .IR getservbyport .

       Endservent closes the file.

       Getservbyname  and getservbyport sequentially search from the beginning of the file until a matching protocol name or port number 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

SEE ALSO
       getprotoent(3N), services(5)

DIAGNOSTICS
       Null pointer(0) returned on EOF or error.

BUGS
       All information is contained in a static area so it must be copied if it is to be saved.  Expecting port numbers to fit in a 32	bit  quan-
       tity is probably naive.

4.2 Berkeley Distribution					   May 19, 1986 						    GETSERVENT(3N)