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GETSERVENT(3)		   Linux Programmer's Manual		 GETSERVENT(3)

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

SYNOPSIS
       #include	<netdb.h>

       struct servent *getservent(void);

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

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

       void setservent(int stayopen);

       void endservent(void);

DESCRIPTION
       The getservent()	function reads the next	line from the  file  /etc/ser-
       vices  and returns a structure servent containing the broken out	fields
       from the	line.  The /etc/services file is opened	if necessary.

       The getservbyname() function returns a servent structure	for  the  line
       from  /etc/services that	matches	the service name using protocol	proto.
       If proto	is NULL, any protocol will be matched.

       The getservbyport() function returns a servent structure	for  the  line
       that  matches  the port port given in network byte order	using protocol
       proto. If proto is NULL,	any protocol will be matched.

       The setservent()	function opens and rewinds the /etc/services file.  If
       stayopen	is true	(1), then the file will	not be closed between calls to
       getservbyname() and getservbyport().

       The endservent()	function closes	/etc/services.

       The servent structure is	defined	in _netdb.h_ as	follows:

	      struct servent {
		      char    *s_name;	      /* official service name */
		      char    **s_aliases;    /* alias list */
		      int     s_port;	      /* port number */
		      char    *s_proto;	      /* protocol to use */
	      }

       The members of the servent structure are:

       s_name The official name	of the service.

       s_aliases
	      A	zero terminated	list of	alternative names for the service.

       s_port The port number for the service given in network byte order.

       s_proto
	      The name of the protocol to use with this	service.

RETURN VALUE
       The getservent(), getservbyname() and getservbyport() functions	return
       the  servent structure, or a NULL pointer if an error occurs or the end
       of the file is reached.

FILES
       /etc/services
	      services database	file

CONFORMING TO
       BSD 4.3

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

BSD				  2001-07-25			 GETSERVENT(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | FILES | CONFORMING TO | SEE ALSO

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