getservent(3)						     Library Functions Manual						     getservent(3)

NAME

       getservent, getservent_r - Get a services file entry from the /etc/services file.

LIBRARY

       Standard C Library (libc)

SYNOPSIS

       #include <netdb.h>
       struct servent *getservent(void);

       The following obsolete function is supported only for backward compatibility reasons. You should not use it in new designs.

       int getservent_r(      struct servent *serv,	 struct servent_data *serv_data);

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       getservent(): XNS5.0

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       [Tru64  UNIX]  For  getservent_r()  only,  this	points	to  the servent structure.  The netdb.h header file defines the servent structure.
       [Tru64 UNIX]  For getservent_r() only, this  points to the servent_data structure.  The netdb.h header file defines the servent_data struc-
       ture.

DESCRIPTION

       The  getservent()  (get service entry) function opens and reads the next line of either the local /etc/services file or the NIS distributed
       services file for the requested information.  To determine which file or files to search, and in which order, the system uses the  switches
       in the /etc/svc.conf file.

       An application program can use the getservent() function to retrieve information about network services and the protocol ports they use.

       The  getservent()  function returns a pointer to a servent structure, which contains fields for a line of information from the network ser-
       vices database file.  The servent structure is defined in the netdb.h header file as follows: struct  servent {
	       char    *s_name;        /* official service name */
	       char    **s_aliases;    /* alias list */
	       int     s_port;	       /* port # */
	       char    *s_proto;       /* protocol to use */ };

       The network services database file remains open after a call by the getservent() function.  Use the endservent() function to close the net-
       work services database file.  Use the setservent() function to rewind.

NOTES

       The  getservent()  function returns a pointer to thread-specific data.  Subsequent calls to this or a related function from the same thread
       overwrite this data.

       [Tru64 UNIX]  The getservent_r() function is an obsolete reentrant version of the getservent() function and  should  not  be  used  in  new
       designs.  Note that you must zero-fill the servent_data structure before its first access by the getservent_r() function.

RETURN VALUES

       Upon successful completion, the getservent() function returns a pointer to a servent structure.	If it fails or reaches the end of the net-
       work services database file, it returns a null pointer.

       [Tru64 UNIX]  Upon successful completion, the getservent_r() function stores the servent structure in the location pointed to by serv,  and
       returns a value of 0 (zero).  Upon failure, it returns a value of -1.

ERRORS

       Current industry standards do not define error values for the getservent() function.

       [Tru64  UNIX]  If  any  of  the following conditions occurs, the getservent_r() function sets errno to the corresponding value: The serv or
       serv_data parameter is invalid.	The search failed.

       [Tru64 UNIX]  In addition, if the function fails to open the file, it sets errno to indicate the cause of the failure.

FILES

       The DARPA Internet network service name database file. Each record in the file occupies a single line and has  four  fields:  the  official
       service name, the port number, the protocol name, and aliases.  The database service selection configuration file.

RELATED INFORMATION

       Functions: getservbyport(3), getservbyname(3), endservent(3), setservent(3)

       Files: services(4), svc.conf(4)

       Networks: nis_intro(7)

       Standards: standards(5) delim off

																     getservent(3)