1 files changed, 197 insertions, 0 deletions
diff --git a/sys/etc/xalloc.x b/sys/etc/xalloc.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<xalloc.h>
+include	<syserr.h>
+include	<ctype.h>
+include	<knet.h>
+
+.helpsys xalloc
+.nf _________________________________________________________________________
+XALLOC -- Device allocation package.
+
+	  xallocate (device)
+	xdeallocate (device, rewind)
+	  xdevowner (device, owner, maxch)
+	 xdevstatus (device, out)
+	  xgdevlist (device, devlist, maxch, onedev)
+
+status:
+
+	DV_DEVFREE	device is free and can be allocated
+	DV_DEVALLOC	device is already allocated
+	DV_DEVINUSE	device is in use by someone else
+	DV_DEVNOTFOUND	device is not in device table
+
+The allocatable devices are defined in the text file dev$tapecap.
+.endhelp ____________________________________________________________________
+
+define	SZ_DEVLIST	256
+define	ALLOCATE	1
+define	DEALLOCATE	0
+
+
+# XALLOCATE -- Attempt to allocate the named device, i.e., allocate the device
+# for exclusive i/o, and ready it for i/o following some sort of OPEN call.
+# Allocate performs the function called "mount" on some systems, as well as
+# allocating the device.
+
+int procedure xallocate (device)
+
+char	device[ARB]		#I device to be allocated
+
+pointer	sp, devlist
+int	status, onedev
+int	xgdevlist(), mtfile()
+errchk	xgdevlist, mtallocate
+define	done_ 91
+
+begin
+	call smark (sp)
+	call salloc (devlist, SZ_DEVLIST, TY_CHAR)
+
+	# Fetch the device list for the named device.
+	onedev = NO
+	status = xgdevlist (device, Memc[devlist], SZ_DEVLIST, onedev)
+	if (status != OK)
+	    goto done_
+
+	# Attempt to allocate the device at the host system level.
+	call strpak (Memc[devlist], Memc[devlist], SZ_DEVLIST)
+	call zdvall (Memc[devlist], ALLOCATE, status)
+
+	# If that worked and the device is a magtape, call MTIO to complete
+	# the allocation process.
+
+	if (status == OK && mtfile (device) == YES)
+	    call mtallocate (device)
+done_
+	call sfree (sp)
+	return (status)
+end
+
+
+# XDEALLOCATE -- Deallocate the named device.
+
+int procedure xdeallocate (device, rewind)
+
+char	device[ARB]		#I device to be deallocated
+int	rewind			#I rewind if magtape?
+
+int	status, onedev
+pointer	sp, devlist, osdev, owner
+int	xgdevlist(), mtfile()
+errchk	xgdevlist, syserrs
+define	done_ 91
+
+begin
+	call smark (sp)
+	call salloc (devlist, SZ_DEVLIST, TY_CHAR)
+	call salloc (osdev, SZ_FNAME, TY_CHAR)
+	call salloc (owner, SZ_FNAME, TY_CHAR)
+
+	# Get the i/o device name.
+	onedev = YES
+	status = xgdevlist (device, Memc[osdev], SZ_FNAME, onedev)
+	if (status != OK)
+	    goto done_
+
+	# Verify that the device is actually allocated.  If the device is a
+	# magtape, call MTIO to conditionally rewind the drive and deallocate
+	# the drive in MTIO.
+
+	call strpak (Memc[osdev], Memc[osdev], SZ_FNAME)
+	call zdvown (Memc[osdev], Memc[owner], SZ_FNAME, status)
+	if (status != DV_DEVALLOC)
+	    call syserrs (SYS_MTNOTALLOC, device)
+	else if (mtfile (device) == YES)
+	    call mtdeallocate (device, rewind)
+
+	# Fetch the device list for the named device.
+	onedev = NO
+	status = xgdevlist (device, Memc[devlist], SZ_DEVLIST, onedev)
+	if (status != OK)
+	    goto done_
+
+	# Physically deallocate the device.
+	call strpak (Memc[devlist], Memc[devlist], SZ_DEVLIST)
+	call zdvall (Memc[devlist], DEALLOCATE, status)
+done_
+	call sfree (sp)
+	return (status)
+end
+
+
+# XDEVSTATUS -- Print the status of the named device on the output file.
+
+procedure xdevstatus (device, out)
+
+char	device[ARB]		#I device
+int	out			#I output file
+
+int	status
+char	owner[SZ_FNAME]
+int	xdevowner(), mtfile()
+errchk	xdevowner, mtfile
+
+begin
+	status = xdevowner (device, owner, SZ_FNAME)
+
+	switch (status) {
+	case DV_DEVFREE:
+	    call fprintf (out, "device %s is not currently allocated\n")
+		call pargstr (device)
+	    if (mtfile (device) == YES)
+		iferr (call mtstatus (out, device))
+		    ;
+	case DV_DEVINUSE:
+	    call fprintf (out, "device %s is currently allocated to %s\n")
+		call pargstr (device)
+		call pargstr (owner)
+	case DV_DEVALLOC:
+	    if (mtfile (device) == YES)
+		call mtstatus (out, device)
+	    else {
+		call fprintf (out, "device %s is allocated\n")
+		    call pargstr (device)
+	    }
+	default:
+	    call fprintf (out, "cannot get device status for `%s'\n")
+		call pargstr (device)
+	}
+end
+
+
+# XDEVOWNER -- Determine whether or not the named device is already
+# allocated, and if the device is currently allocated to someone else,
+# return the owner name.
+
+int procedure xdevowner (device, owner, maxch)
+
+char	device[ARB]		#I device to be deallocated
+char	owner[maxch]		#O receives owner name
+int	maxch			#I max chars out
+
+pointer	sp, devlist
+int	status, onedev
+int	xgdevlist()
+errchk	xgdevlist
+define	done_ 91
+
+begin
+	call smark (sp)
+	call salloc (devlist, SZ_DEVLIST, TY_CHAR)
+
+	# Fetch the device list for the named device.
+	onedev = YES
+	status = xgdevlist (device, Memc[devlist], SZ_DEVLIST, onedev)
+	if (status != OK)
+	    goto done_
+
+	# Query device allocation.
+	call strpak (Memc[devlist], Memc[devlist], SZ_DEVLIST)
+	call zdvown (Memc[devlist], owner, maxch, status)
+	call strupk (owner, owner, maxch)
+done_
+	call sfree (sp)
+	return (status)
+end