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#ifndef lint
static char SccsId[] = "%W% %G%";
#endif
/* Module: ctrlmbox.c (ControlMailbox)
* Purpose: Handle a VMS mailbox for IO
* Subroutine: open_mailbox() returns: int
* Subroutine: close_mailbox() returns: void
* Subroutine: flush_mailbox() returns: void
* Copyright: 1989, 1990 Smithsonian Astrophysical Observatory
* You may do anything you like with this file except remove
* this copyright. The Smithsonian Astrophysical Observatory
* makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without
* express or implied warranty.
* Modified: {0} Jay Travisano (STScI) initial version 10 Nov 1989
* {1} MVH simplified for new connect module 10 March 1990
* {n} <who> -- <does what> -- <when>
*/
#ifdef VMS
/*
* VMS -- Use VMS/IRAF Imtool driver (ZFIOVI)
*/
#include <stdio.h> /* define stderr, FILE, NULL, etc */
#include <sys/file.h> /* define open */
#include <X11/Xlib.h> /* X window stuff */
#include "hfiles/control.h" /* declare control structure types */
#define READ_ONLY 1 /* IRAF SPP definitions */
#define READ_WRITE 2
#define WRITE_ONLY 3
/*
* Subroutine: open_mailbox
* Purpose: Open a VMS mailbox I/O
* Returns: Channel number on success else -1.
*/
int open_mailbox ( device_name, direction, flush_flag )
char *device_name; /* i: name of mailbox device */
int direction; /* i: IOP_Write, IOP_Read, IOP_ReadWrite */
int flush_flag; /* i: 1=flush, 0=don't flush */
{
int ipc; /* o: channel of new pipe connection */
int mode;
if( direction == IOP_Write )
mode = WRITE_ONLY;
else if( direction == IOP_Read )
mode = READ_ONLY;
else if( direction == IOP_ReadWrite )
mode = READ_WRITE;
else
return( -1 );
zopnvi(device_name, &mode, &ipc);
if( ipc == -1 ) {
(void)fprintf(stderr,"Warning: cannot open %s\n", device_name);
return( -1 );
}
#ifdef VMS_FLUSH_INPUT
/* Don't think we want to do this. Mailboxes are pretty well-behaved,
* and we should be able to pick up pending input if we are (re)started
* after IRAF has sent data.
*/
if( flush_flag && (mode != WRITE_ONLY) )
/* if reading, flush old input, if any */
flush_mailbox(ipc, 0, device_name);
#endif
return( ipc );
}
/*
* Subroutine: close_mailbox
* Purpose: Close a mailbox connection
* Returns: 0 on success else -1.
*/
int close_mailbox ( ipc, device_name )
int ipc; /* i: mailbox channel number */
char *device_name; /* i: name of mailbox device */
{
int chan, status;
chan = ipc;
zclsvi(&chan, &status);
if( status == -1 ) {
(void)fprintf(stderr,"Warning: cannot close mailbox %s\n", device_name);
return( -1 );
} else {
return( 0 );
}
}
/*
* Subroutine: flush_mailbox
* Purpose: Suck all bytes out of a pipe open for reading
*/
void flush_mailbox ( ipc, device_name )
int ipc; /* i: mailbox channel number */
char *device_name; /* [i]: name of mailbox device */
{
int bytes, total;
char buf[8192];
int read_mailbox();
total = 0;
while( ZPending(ipc) ) {
bytes = read_mailbox(ipc, buf, sizeof(buf), 0, device_name, "junk");
total += bytes;
}
#ifdef DEBUG
if( total > 0 )
(void)fprintf(stderr, "Flushed %d bytes from pipe\n", total);
#endif
}
/*
* Subroutine: read_mailbox
* Purpose: Read VMS mailbox
* Returns: Byte count, 0 on EOF, -1 on error
*/
int read_mailbox ( ipc, buf, bytes, report_error, device_name, detail )
int ipc; /* i: mailbox channel number */
char *buf; /* i: address of buffer to receive data */
int bytes; /* i: maximum number of bytes to read */
int report_error; /* i: report under-count read */
char *device_name; /* [i]: name of mailbox device */
char *detail; /* [i]: details of operation */
{
int chan = ipc;
int maxbytes = bytes;
int offset = 0;
int status;
zardvi(&chan, buf, &maxbytes, &offset);
zawtvi(&chan, &status);
if( report_error ) {
if( status <= 0 ) {
(void)fprintf(stderr, "Error in reading");
if( detail != NULL )
(void)fprintf(stderr, " %s", detail);
if( device_name != NULL )
(void)fprintf(stderr, " from %s", device_name);
(void)fprintf(stderr, "\n");
(void)fflush(stderr);
} else {
if (status < maxbytes) {
(void)fprintf(stderr, "Expected %d bytes, read %d\n",
maxbytes, status);
(void)fflush(stderr);
}
}
}
return( status );
}
/*
* Subroutine: write_mailbox
* Purpose: Write to VMS mailbox
* Returns: Byte count, 0 on EOF, -1 on error
*/
int write_mailbox ( ipc, buf, bytes, device_name )
int ipc; /* i: mailbox channel number */
char *buf; /* i: address of buffer to write */
int bytes; /* i: number of bytes to write */
char *device_name; /* i: name of mailbox device */
{
int chan = ipc;
int nbytes = bytes;
int offset = 0;
int status;
zawrvi(&chan, buf, &nbytes, &offset);
zawtvi(&chan, &status);
if( status < bytes )
(void)fprintf(stderr, "Write error on %s; wrote %d of %d bytes\n",
device_name, status, bytes);
return( status );
}
#endif
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