Darren Reed wrote:

> In some email I received from Simon Burge, sie wrote:
> > Eduardo Horvath wrote:
> > 
> > > On Tue, 18 Apr 2000, Simon Burge wrote:
> > > 
> > > >  3) Need the size of "char **" for same reasons as 2).
> > > > 
> > > >     Is there an easy way to tell if a process is a 32 or 64 bit process?
> > > 
> > > No.  But I added a P_32 flag to the proc struct to indicate that a process
> > > is running under 32-bit emulation.
> > 
> > So for the 32 bit emul case, you'd need to know the possibility that
> > you might be running under emulation, which isn't really possible (eg,
> > mips ps today, with mips64 maybe occuring one day).  But if we stored
> > the kernel's idea of the pointer size and looking at P_32 if the pointer
> > size is 8 bytes then we should be able to cover all possibilities...
> > 
> > sysctl HW_KERNPTRSIZE ?
> 
> I don't see anything in Solaris7 but HP-UX 11.0 has the following
> for sysconf():

Cool, but it's not on the HP-UX 9 box I have access to :-(

Make's it easier to choose a name when someone else has done it for you!
The following does the job for me.  On an alpha:

	alpha:~ 43> sysctl hw.kernel_bits
	hw.kernel_bits = 64
	alpha:~ 44> getconf KERNEL_BITS
	64

and a peecee:

	wincen:~ 47> sysctl hw.kernel_bits
	hw.kernel_bits = 32
	wincen:~ 48> getconf KERNEL_BITS
	32

The HP description (that also matches current reality for NetBSD) of
"bits for a pointer _or_ long" - is this wording a concern?

Simon.
--
Index: lib/libc/gen/sysconf.3
===================================================================
RCS file: /cvsroot/basesrc/lib/libc/gen/sysconf.3,v
retrieving revision 1.14
diff -p -u -r1.14 sysconf.3
--- sysconf.3	1999/09/27 16:27:12	1.14
+++ sysconf.3	2000/04/20 05:21:59
@@ -183,6 +183,8 @@ otherwise \-1.
 .It Li _SC_2_UPE
 Return 1 if the system supports the User Portability Utilities Option,
 otherwise \-1.
+.It Li _SC_KERNEL_BITS
+Return the number of bits in a kernel pointer or long data type.
 .El
 .Sh RETURN VALUES
 If the call to
Index: lib/libc/gen/sysconf.c
===================================================================
RCS file: /cvsroot/basesrc/lib/libc/gen/sysconf.c,v
retrieving revision 1.12
diff -p -u -r1.12 sysconf.c
--- sysconf.c	2000/01/22 22:19:12	1.12
+++ sysconf.c	2000/04/20 05:21:59
@@ -232,6 +232,15 @@ sysconf(name)
 	case _SC_XOPEN_SHM:
 		mib[0] = CTL_KERN;
 		mib[1] = KERN_SYSVSHM;
+		goto yesno;
+		break;
+
+/* extensions */
+	case _SC_KERNEL_BITS:
+		mib[0] = CTL_HW;
+		mib[1] = HW_KERNEL_BITS;
+		break;
+		
 yesno:		if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
 			return (-1);
 		if (value == 0)
Index: sys/kern/kern_sysctl.c
===================================================================
RCS file: /cvsroot/syssrc/sys/kern/kern_sysctl.c,v
retrieving revision 1.61
diff -p -u -r1.61 kern_sysctl.c
--- kern_sysctl.c	2000/04/15 04:38:07	1.61
+++ kern_sysctl.c	2000/04/20 05:21:59
@@ -468,6 +473,8 @@ hw_sysctl(name, namelen, oldp, oldlenp, 
 		return (sysctl_rdint(oldp, oldlenp, newp, PAGE_SIZE));
 	case HW_ALIGNBYTES:
 		return (sysctl_rdint(oldp, oldlenp, newp, ALIGNBYTES));
+	case HW_KERNEL_BITS:
+		return (sysctl_rdint(oldp, oldlenp, newp, sizeof(long) * NBBY));
 	default:
 		return (EOPNOTSUPP);
 	}
Index: sys/sys/sysctl.h
===================================================================
RCS file: /cvsroot/syssrc/sys/sys/sysctl.h,v
retrieving revision 1.45
diff -p -u -r1.45 sysctl.h
--- sysctl.h	2000/04/15 17:51:27	1.45
+++ sysctl.h	2000/04/20 05:22:00
@@ -273,7 +364,8 @@ struct kinfo_proc {
 #define	HW_DISKSTATS	 9		/* struct: diskstats[] */
 #define	HW_MACHINE_ARCH	10		/* string: machine architecture */
 #define	HW_ALIGNBYTES	11		/* int: ALIGNBYTES for the kernel */
-#define	HW_MAXID	12		/* number of valid hw ids */
+#define	HW_KERNEL_BITS	12		/* int: bits in a kernep pointer/long */
+#define	HW_MAXID	13		/* number of valid hw ids */
 
 #define CTL_HW_NAMES { \
 	{ 0, 0 }, \
@@ -288,6 +380,7 @@ struct kinfo_proc {
 	{ "diskstats", CTLTYPE_STRUCT }, \
 	{ "machine_arch", CTLTYPE_STRING }, \
 	{ "alignbytes", CTLTYPE_INT }, \
+	{ "kernel_bits", CTLTYPE_INT }, \
 }
 
 /*
Index: usr.bin/getconf/getconf.c
===================================================================
RCS file: /cvsroot/basesrc/usr.bin/getconf/getconf.c,v
retrieving revision 1.12
diff -p -u -r1.12 getconf.c
--- getconf.c	2000/04/20 00:41:20	1.12
+++ getconf.c	2000/04/20 05:22:00
@@ -152,6 +152,10 @@ const struct conf_variable conf_table[] 
 
   /* X/Open CAE Spec. Issue 5 Version 2 Configurable System Variables */
   { "FILESIZEBITS",		PATHCONF,	_PC_FILESIZEBITS	},
+
+  /* Extensions */
+  { "KERNEL_BITS",		SYSCONF,	_SC_KERNEL_BITS		},
+
   { NULL }
 };