Switch BUILD_ARCH in Makefile to use uname -p suggested by ru.

Switch strncpy to strlcpy suggested by gad and issue found by pjd.
Add to uname(3) man page describing:
	UNAME_s
	UNAME_r
	UNAME_v
	UNAME_m
Add to getosreldate(3) man page describing:
	OSVERSION

Submitted by:	ru, pjd/gad
Reviewed by:	ru (man pages)

4 files changed, 43 insertions, 7 deletions

diff --git a/Makefile.inc1 b/Makefile.inc1
index 6a93be9..33776bb 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -122,7 +122,7 @@ _CPUTYPE!=	MAKEFLAGS= CPUTYPE=${_TARGET_CPUTYPE} ${MAKE} \
 .error CPUTYPE global should be set with ?=.
 .endif
 .if make(buildworld)
-BUILD_ARCH!=	uname -m
+BUILD_ARCH!=	uname -p
 .if ${MACHINE_ARCH} != ${BUILD_ARCH}
 .error To cross-build, set TARGET_ARCH.
 .endif
diff --git a/lib/libc/gen/__xuname.c b/lib/libc/gen/__xuname.c
index e5139b7..ee96ad6 100644
--- a/lib/libc/gen/__xuname.c
+++ b/lib/libc/gen/__xuname.c
@@ -74,7 +74,7 @@ __xuname(int namesize, void *namebuf)
 	}
 	name->sysname[sizeof(name->sysname) - 1] = '\0';
 	if ((p = getenv("UNAME_s")))
-		strncpy(name->sysname, p, sizeof(name->sysname));
+		strlcpy(name->sysname, p, sizeof(name->sysname));
 
 	mib[0] = CTL_KERN;
 	mib[1] = KERN_HOSTNAME;
@@ -100,7 +100,7 @@ __xuname(int namesize, void *namebuf)
 	}
 	name->release[sizeof(name->release) - 1] = '\0';
 	if ((p = getenv("UNAME_r")))
-		strncpy(name->release, p, sizeof(name->release));
+		strlcpy(name->release, p, sizeof(name->release));
 
 	/* The version may have newlines in it, turn them into spaces. */
 	mib[0] = CTL_KERN;
@@ -123,7 +123,7 @@ __xuname(int namesize, void *namebuf)
 		}
 	}
 	if ((p = getenv("UNAME_v")))
-		strncpy(name->version, p, sizeof(name->version));
+		strlcpy(name->version, p, sizeof(name->version));
 
 	mib[0] = CTL_HW;
 	mib[1] = HW_MACHINE;
@@ -137,6 +137,6 @@ __xuname(int namesize, void *namebuf)
 	}
 	name->machine[sizeof(name->machine) - 1] = '\0';
 	if ((p = getenv("UNAME_m")))
-		strncpy(name->machine, p, sizeof(name->machine));
+		strlcpy(name->machine, p, sizeof(name->machine));
 	return (rval);
 }
diff --git a/lib/libc/gen/getosreldate.3 b/lib/libc/gen/getosreldate.3
index 78dc7e5..ff4d10e 100644
--- a/lib/libc/gen/getosreldate.3
+++ b/lib/libc/gen/getosreldate.3
@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd January 30, 2003
+.Dd December 2, 2005
 .Dt GETOSRELDATE 3
 .Os
 .Sh NAME
@@ -55,6 +55,15 @@ returns the value requested;
 otherwise the value \-1 is returned and the global variable
 .Va errno
 is set to indicate the error.
+.Sh ENVIRONMENT
+.Bl -tag -width ".Ev OSVERSION"
+.It Ev OSVERSION
+If the environment variable
+.Ev OSVERSION
+is set, it will override the
+.Fn getosreldate
+return value.
+.El
 .Sh EXAMPLES
 An example can be found in
 .Pa /usr/share/examples/FreeBSD_version .
diff --git a/lib/libc/gen/uname.3 b/lib/libc/gen/uname.3
index d88ba33..b9e2c9a 100644
--- a/lib/libc/gen/uname.3
+++ b/lib/libc/gen/uname.3
@@ -32,7 +32,7 @@
 .\"	@(#)uname.3	8.1 (Berkeley) 1/4/94
 .\" $FreeBSD$
 .\"
-.Dd January 4, 1994
+.Dd December 2, 2005
 .Dt UNAME 3
 .Os
 .Sh NAME
@@ -72,6 +72,33 @@ Machine hardware platform.
 .El
 .Sh RETURN VALUES
 .Rv -std uname
+.Sh ENVIRONMENT
+.Bl -tag -width ".Ev UNAME_s"
+.It Ev UNAME_s
+If the environment variable
+.Ev UNAME_s
+is set, it will override the
+.Va sysname
+member.
+.It Ev UNAME_r
+If the environment variable
+.Ev UNAME_r
+is set, it will override the
+.Va release
+member.
+.It Ev UNAME_v
+If the environment variable
+.Ev UNAME_v
+is set, it will override the
+.Va version
+member.
+.It Ev UNAME_m
+If the environment variable
+.Ev UNAME_m
+is set, it will override the
+.Va machine
+member.
+.El
 .Sh ERRORS
 The
 .Fn uname