OpenVMS Source-Code Demos

TCPIP$TCP_CLIENT_QIO_2014B

1000	%title	"tcpip$tcp_client_qio_2014b.bas"
	%ident	"100.1"
	declare string constant k_program = "tcpip$tcp_client_qio_2014b"
	!========================================================================================================================
	! title      : tcpip$tcp_client_qio_2014b_100.bas
	! author     : Neil Rieck ( http://neilrieck.net )
	!	     : (c) copyright 1999,2014  Neil Rieck
	!            : Waterloo, Ontario, Canada.
	! created    : 2014-07-31
	! references : HP TCP/IP Services for OpenVMS
	!              Sockets API and System Services Programming (manual: BA548-90002)
	! notes      : 1. stack programming on VMS and OpenVMS can be done by "Sockets API" (easier) or
	!		  "VMS System Services" (harder; a lot like building an Interociter)
	!	       2. A and B client demos employ sys$qiow (synchronous) via VMS System Services
	!	       3. The C client demo employs sys$qio (asynchronous) to provide even more control
	! OS         : OpenVMS (Alpha or Itanium) or VMS on VAX
	! Stack      : TCP/IP Services V5.0 or higher (but should work with any stack after a few mods)
	! compile    : $ bas	tcpip$tcp_client_qio_2014a_100.bas
	! link       : $ link	tcpip$tcp_client_qio_2014a_100
	! history    :
	! ver who when   what
	! --- --- ------ --------------------------------------------------------------------------------------------------------
	! 100 NSR 140804 0. started with TCPIP$TCP_CLIENT_QIO_2014A_100.BAS
	!		 1. added code to perform gethostbyname
	!========================================================================================================================
	option type=explicit							! formal coding
	set no prompt								!
	on error goto common_trap						! old school trapping for this demo
	!
	external long function htonl(long)					! host to network long
	external long function htons(word)					! host to network short
	external long function qtol(quad)					! quad to long
	external long function parse_dest(string,string)			!
	external long function my_gethostbyname(string by desc, long dim() by ref)
	!
	%include "starlet"	%from %library "sys$library:basic$starlet"	! system services
	%include "$ssdef"	%from %library "sys$library:basic$starlet"	! ss$
	%include "$iodef"	%from %library "sys$library:basic$starlet"	! io$
	%include "$efndef"	%from %library "sys$library:basic$starlet"	! efn$
	%include "lib$routines"	%from %library "sys$library:basic$starlet"	! lib$
	%include "$libdef"	%from %library "sys$library:basic$starlet"	! eg. lib$_normal
	%include "$iledef"      %from %library "sys$library:basic$starlet"      ! ile3$ (Item List Entry 3 structures)
!~~~	%include "$iosbdef"     %from %library "sys$library:basic$starlet"	x iosb$ (iosb structures)
	!
	!	I need the following iosb to get around a limitation found in the BASIC version of starlet
	!	(the library definition of sys$qio requires a quad datatype for iosb)
	!
	!	question : How did I know?
	!	answer   : Hacking
	!	reference: http://neilrieck.net/docs/openvms_notes_hacking_starlet.html
	!
	record my_iosb_rec							!
	    variant								!
		case								! vanilla
		    group one							!
			word		iosb$w_status				!
			word		iosb$w_bcnt				!
			long		iosb$l_dev_depend			!
		    end group							!
		case								! used in sys$getqui
		    group two							!
			long		iosb$l_getxxi_status			!
			long		iosb$l_reserved				!
		    end group							!
		case								! used to satisfy the compiler
		    group three							!
			basic$quadword	iosb$quad				!
		    end group							!
	    end variant								!
	end record								!
	%include "sys$library:TCPIP$INETDEF.BAS"				! need this for various inet constants etc.
	!
	record my_sockchar_rec							! socket characteristics (record definition)
	    word	sc_prot							! protocol
	    byte	sc_type							! type
	    byte	sc_af							! address family
	end record 								!
	!
	record my_itmlst2_rec							! item-list 2 descriptor
	    word	il2_length						! length
	    word	il2_type						!
	    long	il2_address						!
	end record								!
	!
	!	named constants
	!
	declare	long constant	TCPBUFSIZ	= 8192				! buffer size (no larger than 32767)
	declare long constant	USRBUFSIZ	= 512				! user input buffer size
	declare word constant	SERV_PORTNUM	= 80				! server port number (80=http)
	!
	!	declare variables
	!
	map(recv)string	buffer_r = TCPBUFSIZ					!
	map(xmit)string buffer_w = TCPBUFSIZ					!
	!
	declare my_iosb_rec	iosb						! i/o status block
	declare my_sockchar_rec conn_sockchar					! connection socket characteristics buffer
	declare SOCKADDRIN	serv_addr					! server socket address inet structure
	declare my_itmlst2_rec	serv_itemlst					!
	declare word		conn_channel					!
	declare quad		junk64						!
	declare long		ip_address					!
	declare long		rc						!
	declare long		bytes_w						!
	declare long		readcount					!
	declare long		bytes_r						!
	declare long		bytes_r_total					!
	declare string		msg$						!
	declare string		inet_device					!
	declare string		dest$						!
	declare string		path$						!
	declare string		octet$(3)					!
	declare long		octet(3)					!
	declare long		junk%						!
	declare long		junk1						!
	declare long		junk2						!
	declare long		dest_kind					!
	declare long		i%						!
	!
	!=======================================================================
	!	main
	!=======================================================================
2000	main:
	print
	print "-i-program: "+ k_program
	print "-i-this program will connect to a website on port "+ str$(SERV_PORTNUM)
	!
	!	initialize variables
	!
	inet_device			= "TCPIP$DEVICE:"			!
	!
	conn_sockchar::sc_prot		= TCPIP$C_TCP				! init (local) connection socket
	conn_sockchar::sc_type		= TCPIP$C_STREAM			!
	conn_sockchar::sc_af		= TCPIP$C_AF_INET			!
	!
	declare word sck_parm(2)
	sck_parm(0) = TCPIP$C_TCP
	sck_parm(1) = INET_PROTYP$C_STREAM
	!
	serv_addr::SIN$W_FAMILY		= TCPIP$C_AF_INET			! init (remote) connection socket
	serv_addr::SIN$W_PORT		= htons(SERV_PORTNUM)			!
	!
	get_dest:
	print "-i-Menu:"
	print "   1 = 142.180.221.226"
	print "   2 = kawc96.on.bell.ca"
	print "   Q = quit"
	print "   or anything else (eg. www3.sympatico.ca         )"
	print "                    (eg. neilrieck.net/)"
	print
	print "-?-destination? ";
	input dest$
	dest$ = edit$(dest$,2)							! no white space
	select dest$								!
	    case "1"								!
		dest$ = "142.180.221.226"					!
	    case "2"								!
		dest$ = "kawc96.on.bell.ca"					!
	    case else								!
		goto fini if len(dest$) <= 1					! "Q", "q", etc.
	end select								!
	!
3000	dest_kind = parse_dest(dest$, path$)					! all three params will be modified
	!
	if dest_kind = 0 then							!
	    print "-e-error, your input data is not useable"			!
	    goto get_dest							!
	end if									!
	!-----------------------------------------------------------------------
	if dest_kind = 1 then							! we "know" this is an IPv4 address
	    junk1 = 0								! init
	    for i% = 0 to 3							! sc
		junk2 = pos(dest$, ".", junk1+1)				!
		junk2 = len(dest$)+1	if junk2 = 0				!
		octet$(i%) = seg$(dest$,junk1+1,junk2-1)			!
		junk1 = junk2							! reference pt moves along
	    next i%								!
	    when error in							!
		junk64	= integer(octet$(0)) * 16777216	+ 			! 2^24			&
			  integer(octet$(1)) * 65536	+ 			! 2^16			&
			  integer(octet$(2)) * 256	+ 			! 2^8			&
			  integer(octet$(3))					! 2^0
	    use									!
		junk64 = 0							!
	    end when								!
	    if junk64 = 0 then							!
		print "-e-error:";err;"during data conversion"			!
		goto get_dest							!
	    end if								!
	end if									!
	!-----------------------------------------------------------------------
	if dest_kind = 2 then							! we think this might be a dns name
	    rc = my_gethostbyname(dest$, octet())				!
	    if ((rc and 7%) <> 1) then						!
		print "-e-dns lookup failed with status:";rc			!
		goto get_dest							!
	    end if								!
	    when error in							!
		junk64	= octet(0) * 16777216	+ 				! 2^24			&
			  octet(1) * 65536	+ 				! 2^16			&
			  octet(2) * 256	+ 				! 2^8			&
			  octet(3)						! 2^0
	    use									!
		junk64 = 0							!
	    end when								!
	    if junk64 = 0 then							!
		print "-e-error:";err;"during data conversion"			!
		goto get_dest							!
	    end if								!
	end if									!
	!-----------------------------------------------------------------------
	ip_address			= qtol (junk64)				!
	serv_addr::SIN$L_ADDR		= htonl (ip_address)			! eg. 142.180.221.226
	!
	serv_itemlst::il2_length	= SIN$K_LENGTH				! need size of serv_addr (SOCKADDRIN)
	serv_itemlst::il2_type		= TCPIP$C_SOCK_NAME			!
	serv_itemlst::il2_address	= loc(serv_addr)			! need addr of serv_addr
	!
	!	create socket (part 1/2)
	!
4000	print "-i-creating socket (assign)"					!
	rc = sys$assign(inet_device, conn_channel,,)				!
	if (rc and 7%) <> 1% then						!
	    print "-e-error:";rc;"while assigning channel to TCPIP device"	!
	end if									!
	!
	!	create socket (part 2/2)
	!
4010	print "-i-creating socket (qio)"
	rc = sys$qiow(	EFN$C_ENF,		! event flag			&
			conn_channel,		! i/o channel			&
			IO$_SETMODE,		! i/o function code		&
			iosb::iosb$quad,	! i/o status block		&
			,			! ast service routine		&
			,			! ast parameter			&
			conn_sockchar,		! p1 - socket characteristics	&
			,			! p2				&
			,			! p3				&
			,			! p4				&
			,			! p5				&
						! p6				&
			)			!
	if (rc and 7%) = 1% then						! if the system call queued properly
	   rc = iosb::iosb$w_status						! then we want to check the final result
	end if									!
	if (rc and 7%) <> 1% then						!
	    print "-e-error:";rc;"while creating socket"			!
	end if									!
	!
	!	connect to server
	!
4020	print "-i-connecting to host"
	rc = sys$qiow(	EFN$C_ENF,		! event flag			&
			conn_channel,		! i/o channel			&
			IO$_ACCESS,		! i/o function code		&
			iosb::iosb$quad,	! i/o status block		&
			,			! ast service routine		&
			,			! ast parameter			&
			,			! p1				&
			,			! p2				&
			loc(serv_itemlst),	! p3 - remote socket info	&
			,			! p4				&
			,			! p5				&
						! p6				&
			)			!
	if (rc and 7%) = 1% then						! if the system call queued properly
	   rc = iosb::iosb$w_status						! then we want to check the final result
	end if									!
	if (rc and 7%) <> 1% then						!
	    print "-e-error:";rc;"while connecting to server"			!
	end if									!
	!
	!	send a message to retrieve the default web page
	!
	!	eg. something like:	GET / HTTP/1.0"
	!			or:	GET /n.rieck HTTP/1.0"
	!
!~~~	msg$ = "GET / HTTP/1.0" + cr + lf + cr + lf				x a blank line marks the end of an HTTP block
	path$ = "/"	if path$ = ""						!
	msg$ = "GET "+ path$ +" HTTP/1.0" + cr + lf + cr + lf			! a blank line marks the end of an HTTP block
	bytes_w = len(msg$)							! determine the data length
	buffer_w = msg$								! xref data to buffer for qio
	!
4030	print "-i-sending data: ";msg$
	rc = sys$qiow(	EFN$C_ENF,		! event flag			&
			conn_channel,		! i/o channel			&
			IO$_WRITEVBLK,		! i/o function code		&
			iosb::iosb$quad,	! i/o status block		&
			,			! ast service routine		&
			,			! ast parameter			&
			buffer_w,		! p1 buffer address		&
			bytes_w,		! p2 buffer length (to send)	&
			,			! p3				&
			,			! p4				&
			,			! p5				&
						! p6				&
			)			!
	if (rc and 7%) = 1% then						! if the system call queued properly
	   rc = iosb::iosb$w_status						! then we want to check the final result
	end if									!
	if (rc and 7%) <> 1% then						!
	    print "-e-error:";rc;"while sending to server"			!
	end if									!
	!
	!	read the response
	!
4040	print "-i-receiving data"
	readcount = 0								! init loop counter
	bytes_r_total = 0							!
	!
	read_loop:
	bytes_r = 0								! init
	readcount =  readcount + 1
	print "-i-receiving count:";readcount
	print "   -------------------"
	rc = sys$qiow(	EFN$C_ENF,		! event flag			&
			conn_channel,		! i/o channel			&
			IO$_READVBLK,		! i/o function code		&
			iosb::iosb$quad,	! i/o status block		&
			,			! ast service routine		&
			,			! ast parameter			&
			buffer_r,		! p1 buffer address		&
			TCPBUFSIZ,		! p2 buffer length (to send)	&
			,			! p3				&
			,			! p4				&
			,			! p5				&
						! p6				&
			)			!
	if (rc and 7%) = 1% then						! if the system call queued properly
	   rc = iosb::iosb$w_status						! then we want to check the final result
	end if									!
	if (rc and 7%) <> 1% then						!
	   select rc								!
		case 8428							! this fatal error is normal for the web
		   print "-w-status:";rc;"network partner disconnected logical link"
		case else							!
		   print "-e-error:";rc;"while reading from server"		!
	   end select								!
	else									!
	   bytes_r = iosb::iosb$w_bcnt						! get the actual number of bytes xfer'd
	   print left$(buffer_r,bytes_r)					! output that amount
	   bytes_r_total = bytes_r_total + bytes_r				! also add to total
	   if (bytes_r > 0)				and			&
	      (readcount < 100) then						! if not too crazy
		goto read_loop		 					! yeah, I know, bad form (but this is just a demo)
	   end if								!
	end if									!
	print "-i-total bytes received:";bytes_r_total
	!
	!	shutdown
	!
	print "-i-shutting down the socket"
	rc = sys$qiow(	EFN$C_ENF,			! event flag		&
			conn_channel,			! i/o channel		&
			IO$_DEACCESS or IO$M_SHUTDOWN,	! i/o function code	&
			iosb::iosb$quad,		! i/o status block	&
			,				! ast service routine	&
			,				! ast parameter		&
			,				! p1			&
			,				! p2			&
			,				! p3			&
			,				! p4			&
			TCPIP$C_DSC_ALL,		! p5			&
							! p6			&
			)				!
	if (rc and 7%) = 1% then						! if the system call queued properly
	    rc = iosb::iosb$w_status						! then we want to check the final result
	end if									!
	if (rc and 7%) <> 1% then						!
	    print "-e-error:";rc;"during socket shutdown"			!
	end if									!
	!
	!	close the socket
	!
	print "-i-closing the socket"
	rc = sys$qiow(	EFN$C_ENF,			! event flag		&
			conn_channel,			! i/o channel		&
			IO$_DEACCESS		,	! i/o function code	&
			iosb::iosb$quad,		! i/o status block	&
			,				! ast service routine	&
			,				! ast parameter		&
			,				! p1			&
			,				! p2			&
			,				! p3			&
			,				! p4			&
			,				! p5			&
							! p6			&
			)				!
	if (rc and 7%) = 1% then						! if the system call queued properly
	   rc = iosb::iosb$w_status						! then we want to check the final result
	end if									!
	if (rc and 7%) <> 1% then						!
	   print "-e-error:";rc;"during socket shutdown"			!
	end if									!
	!
	!	deassign the socket
	!
	rc = sys$dassgn(conn_channel)						!
	if (rc and 7%) <> 1% then						!
	   print "-e-error:";rc;"during deassign"				!
	end if									!
	!
	goto fini								! that's all she wrote...
	!
	!	old-school common trap (normally you would only use inline "when error / use / end when" blocks
	!
	common_trap:
	print
	print "common error trap"						!
	print "-i-line  ";erl							!
	print "-i-error ";err							!
	print "-i-text  ";ert$(err)						!
	resume fini								! fix the stack
	!
	fini:
	print "-i-adios..."							!
32000	end									!
	!
	!########################################################################################################################
	!	external functions
	!########################################################################################################################
	!
	!=======================================================================
	!	host to network short
	!	OpenVMS is little endian but the network is big endian
	!=======================================================================
32010	function word htons(word inbound)					!
	option type=explicit							!
	!
	map(htons0)	word	sw0_word0
	map(htons0)	byte	sw0_byte0	,	&
			byte	sw0_byte1
	!
	map(htons1)	word	sw1_word0
	map(htons1)	byte	sw1_byte0	,	&
			byte	sw1_byte1
	!
	sw0_word0	= inbound						!
	sw1_byte0	= sw0_byte1						!
	sw1_byte1	= sw0_byte0						!
	htons		= sw1_word0						! presto
	end function								!
	!
	!=======================================================================
	!	host to network long
	!	OpenVMS is little endian but the network is big endian
	!=======================================================================
32020	function long htonl(long inbound)					!
	option type=explicit							!
	!
	map(htonl0)	long	sw0_long0
	map(htonl0)	word	sw0_word0	,	&
			word	sw0_word1
	map(htonl0)	byte	sw0_byte0	,	&
			byte	sw0_byte1	,	&
			byte	sw0_byte2	,	&
			byte	sw0_byte3
	!
	map(htonl1)	long	sw1_long0
	map(htonl1)	word	sw1_word0	,	&
			word	sw1_word1
	map(htonl1)	byte	sw1_byte0	,	&
			byte	sw1_byte1	,	&
			byte	sw1_byte2	,	&
			byte	sw1_byte3
	!
	sw0_long0	= inbound
	sw1_byte0	= sw0_byte3
	sw1_byte1	= sw0_byte2
	sw1_byte2	= sw0_byte1
	sw1_byte3	= sw0_byte0
	htonl		= sw1_long0						! presto
	end function								!
	!
	!=======================================================================
	!	quad to long
	!	OpenVMS BASIC has no unsigned integers but we sometimes need to
	!	do 32-bit unsigned math. The lazy way is to do 64-bit math then
	!	trucate back to 32-bits (okay if the value is not too large)
	!=======================================================================
32030	function long qtol(quad inbound)					!
	option type=explicit							!
	!
	map(qtol)	quad	sw0_quad0
	map(qtol)	long	sw0_long0	,	&
			long	sw0_long1
	!
	sw0_quad0	= inbound						!
	qtol		= sw0_long0						! presto
	if sw0_long1 <> 0 then							! this should never happen
	    print "-w-oops, information was lost during Quad->Long conversion)"	!
	end if									!
	end function								!
	!
	!=======================================================================
	!	<<< parse_dest >>>
	!
	! examples:
	! 1	input:		"142.180.221.226"		??
	!	return:	1	"142.180.221.226"		""
	! 2	input:		"www3.sympatico.ca"		??
	!	return: 2	"www3.sympatico.ca"		""
	! 3	input:		"142.180.221.226/n.rieck/"	??
	!	return: 1	"142.180.221.226"		"/n.rieck/"
	! 4	input:		"neilrieck.net/"	??
	!	return: 2	"www3.sympatico.ca"		"/n.rieck/"
	! 5	input:		"abcd"				??
	!	return: 0	""				""
	! 6	input:		"http://www3.sympatico.ca"	??
	!	return: 0	""				""
	!		+------ 0 = unusable address
	!		+------ 1 = IP address
	!		+------ 2 = dns name
	!=======================================================================
32040	function long parse_dest(string dest$, string path$)			!
	option type=explicit							!
	declare long	dots		,&
			nums		,&
			alph		,&
			othe		,&
			slash_pos	,&
			i%		,&
			result
	!-----------------------------------------------------------------------
	main:
	result = 0								! assume the worst (unusable)
	!
	print "-i-";dest$
	slash_pos = pos(dest$, "/", 1)						! any slashes here?
	if slash_pos > 0 then							! yes
	    path$ = right$(dest$,slash_pos)					!
	    dest$ = left$( dest$,slash_pos - 1)					!
	else									! no
	    path$ = ""								!
	end if									!
	!
	for i% = 1 to len(dest$)						! prescan the destination
	    select mid$(dest$, i%, 1)						!
		case "."							!
		    dots = dots + 1						!
		case "0" to "9"							!
		    nums = nums + 1						!
		case "a" to "z"							!
		    alph = alph + 1						!
		case else							!
		    othe = othe + 1						!
	    end select								!
	next i%									!
	!
	goto data_unusable	if othe > 0					! we can't use this data
	!
	!	eg. "142.180.221.226"
	!
	if dots=3 and nums>=4 and alph=0 then					! hey, might be IP4
	    result = 1								!
	    goto function_exit							!
	end if									!
	!
	!	eg. "bell.ca" or "www3.sympatico.ca"
	!
	if dots>0 and alph>=3 then						! hey, might be a dns
	    result = 2								!
	    goto function_exit							!
	end if									!
	!
	data_unusable:
	dest$	= ""								!
	path$	= ""								!
	result	= 0								!
	!
	!	result must be set before this point
	!
	function_exit:								!
	parse_dest = result							!
	end function								!
	!

	!=======================================================================
	! <<< my get host by name >>>
	!
	! author : Neil Rieck
	! created: 2014-08-04
	! notes  : derived from my demo: GET_HOST_BY_NAME_QIO.BAS
	!=======================================================================
32050	function long my_gethostbyname(string dns_name$, long octets() by ref)	!
	option type=explicit							! cuz tricks are for kids
	!
	!	<<< external declarations >>>
	!
	%include "starlet"	%from %library "sys$library:basic$starlet"	! system services
	%include "$ssdef"	%from %library "sys$library:basic$starlet"	! ss$
	%include "$iodef"	%from %library "sys$library:basic$starlet"	! io$
	%include "lib$routines"	%from %library "sys$library:basic$starlet"	! lib$
	%include "$dscdef"      %from %library "sys$library:basic$starlet"	! descriptor stuff
!~~~	%include "sys$library:ucx$inetdef.bas"					x ucx defs   (for tcpip <  v5.0)
	%include "sys$library:tcpip$inetdef.bas"				! tcpip defs (for tcpip >= v5.0)
!~~~	%include "$iosbdef"	%from %library "sys$library:basic$starlet"	x iosb$ (iosb structures)
	!
	!       I need this iosb to get around a limitation in the BASIC version of starlet
	!
	!       question : How did I know?
	!       answer   : Hacking
	!       reference: http://neilrieck.net/docs/openvms_notes_hacking_starlet.html
	!
	!	my I/O Status Block (record)
	!
	record myIosbRec							!
	    variant								!
		case								!
		    group one							! 32-bit structure
			!
			! Manual: "Compaq TCP/IP Services for OpenVMS"
			! Chapter "Sockets API and System Services Programming"
			! Example 2-25: BIND Lookup (System Services)
			!
			word		iosb$w_status				! 16-bit status
			word		iosb$w_bcnt				! 16-bit byte count
			long		iosb$l_dev_depend			! 32-bit device dependent data
		    end group one						!
		case								!
		    group two							!
			basic$quadword	iosb$quad				!
		    end group two						!
	    end variant								!
	end record myIosbRec							!
	!
	!	<<< home brewed functions >>>
	!
	external long   function get_timer_bit_vector(long)			! required for used with SYS$WFLOR
	!
	!	<<< variable declarations >>>
	!
	declare long		rc%			,			! return code				&
				junk%			,			!					&
				ptr%			,			!					&
				i%			,			!					&
				j%			,			!					&
				timeout_count%		,			!					&
				tcp_event_flag%		,			! tcp event flag			&
				tcp_ef_state%		,			! tcp event flag state			&
				mask%			,			!					&
				my_switch%		,			!					&
		word		channel_0		,			! INET channel				&
				bytecnt			,			!					&
		long		command			,			! INET command				&
		basic$QuadWord	DeltaQuad		,			! for sys$bintim			&
		myIosbRec	myIosb			,			!					&
		HostEntDef	myHostEnt		,			! see: sys$library:tcpip$inetdef.bas	&
		NetEntDef	myNetEnt		,			! see: sys$library:tcpip$inetdef.bas	&
		string		buffer$			,			!					&
				junk$						!
	!
	!=======================================================================
	!	main
	!=======================================================================
	main:									!
	!
	!	<<< allocate some event flags for later use >>>
	!
	if tcp_event_flag% = 0 then						! if not yet allocated
	    rc% = lib$get_EF( tcp_event_flag% )					! allocate an event flag
	    if ((rc% and 7%) <> 1) then						!
		print "lib$get_EF-1 rc: ";str$(rc%)				!
		goto rc_exit							!
	    end if								!
	end if									!
	!
	!	<<< prep >>>
	!
	declare string	inet_dev						! dynamic string descriptor (good)
			inet_dev = "TCPIP$DEVICE:"				!
	!
	!	Assign a channel to the TCPIP device
	!
	rc% = sys$assign(inet_dev, channel_0,,,)				! assign a channel
	if ((rc% and 7%) <> 1%) then						!
	    print "-e-Failed to assign channel to TCPIP device."		!
	    goto rc_exit							!
	end if									!
	!
	!	we need a "long descriptor" to use io$_acpcontrol in a call to sys$qiow
	!	(I wonder which idiot decided to use a descriptor to pass a long integer?)
	!
	declare dscdef1 cmd_descriptor						!
	cmd_descriptor::DSC$W_MAXSTRLEN	= 4					! 4 bytes = long
	cmd_descriptor::DSC$B_DTYPE	= DSC$K_DTYPE_DSC			! general descriptor
	cmd_descriptor::DSC$B_CLASS	= DSC$K_CLASS_S				! static
	cmd_descriptor::DSC$A_POINTER	= loc(command)				!
	!
	command = inetacp_func$c_gethostbyname +				&
		  (inetacp$c_trans         	* 256)				! trans (binary address)
!~~~	buffer$	= space$( 4)							x space for  4 binary bytes (IPv4)
	buffer$ = space$(16)							! space for 16 binary bytes (IPv6)
	!
	!=======================================================================
	!	do a dns lookup (not timed so use sys$qiow)
	!=======================================================================
	rc% = sys$qiow(	tcp_event_flag%		,				! Event flag				&
			channel_0		,				! Channel number			&
			io$_acpcontrol		,				! I/O function				&
			myIosb::iosb$quad	,				! I/O status block			&
						,				!					&
						,				!					&
			cmd_descriptor		,				! P1 needs to be a descriptor		&
			loc(dns_name$	)	,				! P2					&
			loc(bytecnt	)	, 				! P3					&
			loc(buffer$	)	,				! P4					&
						, 				! P5					&
						)				! P6
	if ((rc% and 7%) = 1%) then 						! if the system call suceeded
	    !
	    !	At this point (after calling TCP/IP routines via qio), the whole
	    !	of myIosb is not the same as what we normally see in VMS (eg. 2160 = EOF = not enough buffer space)
	    !
!~~~	    print "-i-iosb-iosb$w_status:"; str$(myIosb::iosb$w_status)
	    rc% = myIosb::iosb$w_status						!
	    if ((rc% and 7%) = 1%) then						!
		if bytecnt = 0 then						!
		    print "-w-no data returned"					!
		else								!
		    for i% = 1 to bytecnt					! remember: we are "little endian"
!~~~			print "-i-octet"+str$(i%)+": "; asc(mid$(buffer$,i%,1))	!
			octets(i%-1) = asc(mid$(buffer$,i%,1))			! xfer binary bytes
		    next i%							!
		end if								!
	    end if								!
	else									!
	    print "-e-rc% ";str$(rc%)						!
	    print "-e-Failed to do the DNS lookup"				!
	end if									!
	!
	!	do not change rc% after this point; use junk%
	!
	!=======================================================================
	!	Shut down the socket (optional)
	!=======================================================================
	shutdown:
	junk% = sys$qiow(	tcp_event_flag%				,	!				&
				channel_0				,	!				&
				(IO$_DEACCESS or IO$M_SHUTDOWN)		,	!				&
				myIosb::iosb$quad			,	!				&
				, ,						!				&
				, , ,						!				&
				TCPIP$C_DSC_ALL,				! P4 Discard all packets	&
				, )						!
	if ((junk% and 1%) <> 1%) then						!
		print "-e-Failed to shut down the socket"			!
	end if									!

	!
	!	Close the sockets
	!
	junk% = sys$qiow(	tcp_event_flag%		,			!	&
				channel_0		,			!	&
				IO$_DEACCESS		,			!	&
				myIosb::iosb$quad	,			!	&
							, , , , , , , )		!
	if ((junk% and 1%) <> 1%) then						!
	    print "-e-Failed to close the socket."				!
	end if									!

	!
	!	Deassign the TCPIP device channels
	!
	junk% = sys$dassgn(channel_0)						!
	if ((junk% and 1%) <> 1%) then						!
	    print "-e-Failed to deassign the channel"				!
	end if									!
	!
	goto rc_exit

	!=======================================================================
	!	cleanup
	!	caveat: rc% must be preserved so use junk%
	!=======================================================================
	cleanup:
	if tcp_event_flag% <> 0 then						! if allocated
	    junk% = lib$free_EF( tcp_event_flag% )				! allocate an event flag
	    tcp_event_flag% = 0							!
	end if									!
	return									!
	!
	!	rc% must be set up before this point
	!
	rc_exit:
	gosub cleanup								!
	my_gethostbyname = rc%							!
	end function								!

	!======================================================================
	!	get timer bit vector
	!	(see OpenVMS system systevices documentation for "sys$wflor")
	!
	!	notes:	cluster	event flags
	!		0	00- 31
	!		1	32- 63
	!		2	64- 95
	!		3	96-127
	!======================================================================
32060	function long get_timer_bit_vector(long event_flag)
	option type = explicit
	declare long temp
	!
	select event_flag
	    case <= 31
		temp = event_flag
	    case <= 63
		temp = event_flag - 32
	    case <= 95
		temp = event_flag - 64
	    case else
		temp = event_flag -96
	end select
	!
	select temp								! this code will avoid an integer overflow
	    case 31								! need to set bit #31
!					 33222222222211111111110000000000
!					 10987654321098765432109876543210
		get_timer_bit_vector = B"10000000000000000000000000000000"L	! so return this
	    case else								!
		get_timer_bit_vector = (2% ^ temp)				! else return this
	end select
	!
	end function								! get_timer_bit_vector
!------------------------------------------------------------------------------------------------------------------------