getservent

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)