4 files changed, 184 insertions, 3 deletions
diff --git a/lib/libc/gen/Makefile.inc b/lib/libc/gen/Makefile.inc
index 8837038..b06f846 100644
--- a/lib/libc/gen/Makefile.inc
+++ b/lib/libc/gen/Makefile.inc
@@ -15,7 +15,7 @@ SRCS+=  __getosreldate.c __xuname.c \
 	getbootfile.c getbsize.c \
 	getcap.c getcwd.c getdomainname.c getgrent.c getgrouplist.c \
 	gethostname.c getloadavg.c getlogin.c getmntinfo.c getnetgrent.c \
-	getosreldate.c getpagesize.c \
+	getosreldate.c getpagesize.c getpagesizes.c \
 	getpeereid.c getprogname.c getpwent.c getttyent.c \
 	getusershell.c getvfsbyname.c glob.c \
 	initgroups.c isatty.c isinf.c isnan.c jrand48.c lcong48.c \
@@ -51,8 +51,8 @@ MAN+=	alarm.3 arc4random.3 \
 	getbootfile.3 getbsize.3 getcap.3 getcontext.3 getcwd.3 \
 	getdiskbyname.3 getdomainname.3 getfsent.3 \
 	getgrent.3 getgrouplist.3 gethostname.3 getloadavg.3 \
-	getmntinfo.3 getnetgrent.3 getosreldate.3 \
-	getpagesize.3 getpass.3 getpeereid.3 getprogname.3 getpwent.3 \
+	getmntinfo.3 getnetgrent.3 getosreldate.3 getpagesize.3 \
+	getpagesizes.3 getpass.3 getpeereid.3 getprogname.3 getpwent.3 \
 	getttyent.3 getusershell.3 getvfsbyname.3 \
 	glob.3 initgroups.3 isgreater.3 ldexp.3 lockf.3 makecontext.3 \
 	modf.3 \
diff --git a/lib/libc/gen/Symbol.map b/lib/libc/gen/Symbol.map
index 4f1efaf..197430a 100644
--- a/lib/libc/gen/Symbol.map
+++ b/lib/libc/gen/Symbol.map
@@ -366,6 +366,10 @@ FBSD_1.1 {
 	tcsetsid;
 };
 
+FBSD_1.2 {
+	getpagesizes;
+};
+
 FBSDprivate_1.0 {
 	/* needed by thread libraries */
 	__thr_jtable;
diff --git a/lib/libc/gen/getpagesizes.3 b/lib/libc/gen/getpagesizes.3
new file mode 100644
index 0000000..959df81
--- /dev/null
+++ b/lib/libc/gen/getpagesizes.3
@@ -0,0 +1,99 @@
+.\" Copyright (c) 2009 Alan L. Cox <alc@cs.rice.edu>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd September 21, 2009
+.Dt GETPAGESIZES 3
+.Os
+.Sh NAME
+.Nm getpagesizes
+.Nd "get system page sizes"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mman.h
+.Ft int
+.Fn getpagesizes "size_t pagesize[]" "int nelem"
+.Sh DESCRIPTION
+The
+.Fn getpagesizes
+function retrieves page size information from the system.
+When it is called with
+.Fa pagesize
+specified as
+.Dv NULL
+and
+.Fa nelem
+specified as 0, it returns the number of distinct page sizes that are
+supported by the system.
+Otherwise, it assigns up to
+.Fa nelem
+of the system-supported page sizes to consecutive elements of the
+array referenced by
+.Fa pagesize .
+These page sizes are expressed in bytes.
+In this case,
+.Fn getpagesizes
+returns the number of such page sizes that it assigned to the array. 
+.Sh RETURN VALUES
+If successful, the
+.Fn getpagesizes
+function returns either the number of page sizes that are supported by
+the system or the number of supported page sizes that it assigned to
+the array referenced by
+.Fa pagesize .
+Otherwise, it returns the value\~\-1 and sets
+.Va errno
+to indicate the error.
+.Sh ERRORS
+The
+.Fn getpagesizes
+function will succeed unless:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa pagesize
+argument is
+.Dv NULL
+and the
+.Fa nelem
+argument is non-zero.
+.It Bq Er EINVAL
+The
+.Fa nelem
+argument is less than zero.
+.El
+.Sh SEE ALSO
+.Xr getpagesize 3
+.Sh HISTORY
+The
+.Fn getpagesizes
+function first appeared in Solaris 9.
+This manual page was written in conjunction with a new but compatible
+implementation that was first released in
+.Fx 7.3 .
+.Sh AUTHORS
+This manual page was written by
+.An Alan L. Cox Aq alc@cs.rice.edu .
diff --git a/lib/libc/gen/getpagesizes.c b/lib/libc/gen/getpagesizes.c
new file mode 100644
index 0000000..b0de939
--- /dev/null
+++ b/lib/libc/gen/getpagesizes.c
@@ -0,0 +1,78 @@
+/*-
+ * Copyright (c) 2009 Alan L. Cox <alc@cs.rice.edu>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/mman.h>
+#include <sys/sysctl.h>
+
+#include <errno.h>
+
+/*
+ * Retrieves page size information from the system.  Specifically, returns the
+ * number of distinct page sizes that are supported by the system, if
+ * "pagesize" is NULL and "nelem" is 0.  Otherwise, assigns up to "nelem" of
+ * the system-supported page sizes to consecutive elements of the array
+ * referenced by "pagesize", and returns the number of such page sizes that it
+ * assigned to the array.  These page sizes are expressed in bytes.
+ *
+ * The implementation of this function does not directly or indirectly call
+ * malloc(3) or any other dynamic memory allocator that may itself call this
+ * function.
+ */
+int
+getpagesizes(size_t pagesize[], int nelem)
+{
+	static u_long ps[MAXPAGESIZES];
+	static int nops;
+	size_t size;
+	int i; 
+
+	if (nelem < 0 || (nelem > 0 && pagesize == NULL)) {
+		errno = EINVAL;
+		return (-1);
+	}
+	/* Cache the result of the sysctl(2). */
+	if (nops == 0) {
+		size = sizeof(ps);
+		if (sysctlbyname("hw.pagesizes", ps, &size, NULL, 0) == -1)
+			return (-1);
+		/* Count the number of page sizes that are supported. */
+		nops = size / sizeof(ps[0]);
+		while (nops > 0 && ps[nops - 1] == 0)
+			nops--;
+	}
+	if (pagesize == NULL)
+		return (nops);
+	/* Return up to "nelem" page sizes from the cached result. */
+	if (nelem > nops)
+		nelem = nops;
+	for (i = 0; i < nelem; i++)
+		pagesize[i] = ps[i];
+	return (nelem);
+}