The following reply was made to PR port-xen/30027; it has been noted by GNATS.

From: YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
To: port-xen@netbsd.org
Cc: bouyer@antioche.eu.org
Subject: Re: port-xen/30027: IOCTL_PRIVCMD_INITDOMAIN_EVTCHN abuses errno
Date: Thu, 19 May 2005 17:46:10 +0900

 > > But if we fix this we'll have a backward compat issue. I'm not sure how to
 > > handle it.
 > 
 > isn't it enough to renumber the ioctl
 > (and keep the old one for compatibility if needed)?
 
 if no one objects, i'll
 - change the ioctl as the following diff.
 - then request pullup for netbsd-3.
 - finally change xentools in pkgsrc.
 
 YAMAMOTO Takashi
 
 Index: arch/xen/include/xenio.h
 ===================================================================
 --- arch/xen/include/xenio.h	(revision 1082)
 +++ arch/xen/include/xenio.h	(working copy)
 @@ -72,14 +72,11 @@ typedef struct privcmd_blkmsg
  #define IOCTL_PRIVCMD_HYPERCALL         \
      _IOWR('P', 0, privcmd_hypercall_t)
  
 -/*
 - * @cmd: IOCTL_PRIVCMD_INITDOMAIN_EVTCHN
 - * @arg: n/a
 - * Return: Port associated with domain-controller end of control event channel
 - *         for the initial domain.
 - */
 -#define IOCTL_PRIVCMD_INITDOMAIN_EVTCHN \
 +#if defined(_KERNEL)
 +/* compat */
 +#define IOCTL_PRIVCMD_INITDOMAIN_EVTCHN_OLD \
      _IO('P', 1)
 +#endif /* defined(_KERNEL) */
      
  #define IOCTL_PRIVCMD_MMAP             \
      _IOW('P', 2, privcmd_mmap_t)
 @@ -87,6 +84,15 @@ typedef struct privcmd_blkmsg
      _IOW('P', 3, privcmd_mmapbatch_t)
  #define IOCTL_PRIVCMD_GET_MACH2PHYS_START_MFN \
      _IOW('P', 4, unsigned long)
 +
 +/*
 + * @cmd: IOCTL_PRIVCMD_INITDOMAIN_EVTCHN
 + * @arg: n/a
 + * Return: Port associated with domain-controller end of control event channel
 + *         for the initial domain.
 + */
 +#define IOCTL_PRIVCMD_INITDOMAIN_EVTCHN \
 +    _IOR('P', 5, int)
  
  /* Interface to /dev/xenevt */
  /* EVTCHN_RESET: Clear and reinit the event buffer. Clear error condition. */
 Index: arch/xen/xen/privcmd.c
 ===================================================================
 --- arch/xen/xen/privcmd.c	(revision 1082)
 +++ arch/xen/xen/privcmd.c	(working copy)
 @@ -82,11 +82,20 @@ privcmd_ioctl(void *v)
  			: "=a" (error) : "0" (ap->a_data) : "memory" );
  		error = -error;
  		break;
 -	case IOCTL_PRIVCMD_INITDOMAIN_EVTCHN:
 +#if 1 /* COMPAT_xxx */
 +	case IOCTL_PRIVCMD_INITDOMAIN_EVTCHN_OLD:
  		{
  		extern int initdom_ctrlif_domcontroller_port;
  		error = initdom_ctrlif_domcontroller_port;
  		}
 +		break;
 +#endif
 +	case IOCTL_PRIVCMD_INITDOMAIN_EVTCHN:
 +		{
 +		extern int initdom_ctrlif_domcontroller_port;
 +		*(int *)ap->a_data = initdom_ctrlif_domcontroller_port;
 +		}
 +		error = 0;
  		break;
  	case IOCTL_PRIVCMD_MMAP:
  	{