getservbyname returning NULL Post: 302552790

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setservent

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/services 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)