add posix_madvise, posix_memalign, strndup, and strnlen. mostly from

brad and millert, with hints from guenther, jmc, and otto I think.
ok previous.

3 files changed, 48 insertions, 6 deletions

diff --git a/lib/libc/sys/Makefile.inc b/lib/libc/sys/Makefile.inc
index 6e440ac40ce..4d31ad1411c 100644
--- a/lib/libc/sys/Makefile.inc
+++ b/lib/libc/sys/Makefile.inc
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.inc,v 1.89 2010/02/03 20:49:00 miod Exp $
+#	$OpenBSD: Makefile.inc,v 1.90 2010/05/18 22:24:55 tedu Exp $
 #	$NetBSD: Makefile.inc,v 1.35 1995/10/16 23:49:07 jtc Exp $
 #	@(#)Makefile.inc	8.1 (Berkeley) 6/17/93
 
@@ -23,6 +23,9 @@ DPSRCS+= Lint_Ovfork.c Lint_brk.c Lint_exect.c Lint_fork.c \
 	Lint_setjmp.c Lint_longjmp.c \
 	Lint_sigsetjmp.c Lint_siglongjmp.c
 
+# glue to offer userland wrappers for some syscalls
+SRCS+=	posix_madvise.c
+
 # glue to provide compatibility between GCC 1.X and 2.X and for compat
 # with old syscall interfaces.
 SRCS+=	ftruncate.c lseek.c mquery.c mmap.c ptrace.c semctl.c truncate.c \
@@ -264,6 +267,7 @@ MLINKS+=gettimeofday.2 settimeofday.2
 MLINKS+=getuid.2 geteuid.2
 MLINKS+=kqueue.2 kevent.2 kqueue.2 EV_SET.2
 MLINKS+=intro.2 errno.2
+MLINKS+=madvise.2 posix_madvise.2
 MLINKS+=mlock.2 munlock.2
 MLINKS+=mlockall.2 munlockall.2
 MLINKS+=mount.2 unmount.2
diff --git a/lib/libc/sys/madvise.2 b/lib/libc/sys/madvise.2
index 7ac374636d0..0bd769da626 100644
--- a/lib/libc/sys/madvise.2
+++ b/lib/libc/sys/madvise.2
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: madvise.2,v 1.14 2007/05/31 19:19:32 jmc Exp $
+.\"	$OpenBSD: madvise.2,v 1.15 2010/05/18 22:24:55 tedu Exp $
 .\"	$NetBSD: madvise.2,v 1.7 1995/12/27 21:17:02 jtc Exp $
 .\"
 .\" Copyright (c) 1991, 1993
@@ -30,23 +30,29 @@
 .\"
 .\"	@(#)madvise.2	8.1 (Berkeley) 6/9/93
 .\"
-.Dd $Mdocdate: May 31 2007 $
+.Dd $Mdocdate: May 18 2010 $
 .Dt MADVISE 2
 .Os
 .Sh NAME
-.Nm madvise
+.Nm madvise ,
+.Nm posix_madvise
 .Nd give advice about use of memory
 .Sh SYNOPSIS
-.Fd #include <sys/types.h>
 .Fd #include <sys/mman.h>
 .Ft int
 .Fn madvise "void *addr" "size_t len" "int behav"
+.Ft int
+.Fn posix_madvise "void *addr" "size_t len" "int behav"
 .Sh DESCRIPTION
 The
 .Fn madvise
 system call
 allows a process that has knowledge of its memory behavior
 to describe it to the system.
+The
+.Fn posix_madvise
+interface is identical and is provided for standards conformance.
+.Pp
 The possible behaviors are:
 .Bl -tag -width MADV_SEQUENTIAL
 .It Dv MADV_NORMAL
@@ -64,6 +70,15 @@ Ensure that resources are reserved.
 .It Dv MADV_FREE
 The pages don't contain any useful data and can be recycled.
 .El
+.Pp
+Portable programs that call the
+.Fn posix_madvise
+interface should use the aliases
+.Dv POSIX_MADV_NORMAL , POSIX_MADV_RANDOM ,
+.Dv POSIX_MADV_SEQUENTIAL , POSIX_MADV_WILLNEED ,
+and
+.Dv POSIX_MADV_DONTNEED
+rather than the flags described above.
 .Sh RETURN VALUES
 Upon successful completion,
 a value of 0 is returned.
@@ -75,9 +90,21 @@ is set to indicate the error.
 .Xr minherit 2 ,
 .Xr mprotect 2 ,
 .Xr msync 2 ,
-.Xr munmap 2
+.Xr munmap 2 ,
+.Xr posix_madvise 2
+.Sh STANDARDS
+The
+.Fn posix_madvise
+system call is expected to conform to the
+.St -p1003.1-2001
+standard.
 .Sh HISTORY
 The
 .Nm madvise
 function first appeared in
 .Bx 4.4 .
+The
+.Nm posix_madvise
+function first appeared in
+.Ox 4.8 .
+
diff --git a/lib/libc/sys/posix_madvise.c b/lib/libc/sys/posix_madvise.c
new file mode 100644
index 00000000000..4952c5cc77a
--- /dev/null
+++ b/lib/libc/sys/posix_madvise.c
@@ -0,0 +1,11 @@
+/*	$OpenBSD: posix_madvise.c,v 1.1 2010/05/18 22:24:55 tedu Exp $ */
+/*
+ * Ted Unangst wrote this file and placed it into the public domain.
+ */
+#include <sys/mman.h>
+
+int
+posix_madvise(void *addr, size_t len, int behav)
+{
+	return (_thread_sys_madvise(addr, len, behav));
+}