xnu-1699.22.73.tar.gz

[apple/xnu.git] / libsyscall / wrappers / unix03 / mmap.c

diff --git a/libsyscall/wrappers/unix03/mmap.c b/libsyscall/wrappers/unix03/mmap.c
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+++ b/libsyscall/wrappers/unix03/mmap.c
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+/*
+ * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#include <sys/cdefs.h>
+
+#if __DARWIN_UNIX03
+
+#include <sys/mman.h>
+#include <mach/vm_param.h>
+#include <errno.h>
+
+void *__mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off);
+
+/*
+ * mmap stub, with preemptory failures due to extra parameter checking
+ * mandated for conformance.
+ *
+ * This is for UNIX03 only.
+ */
+void *
+mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off)
+{
+       /*
+        * Preemptory failures:
+        * 
+        * o    off is not a multiple of the page size
+        * o    flags does not contain either MAP_PRIVATE or MAP_SHARED
+        * o    len is zero
+        */
+       extern void cthread_set_errno_self(int);
+       if ((off & PAGE_MASK) ||
+           (((flags & MAP_PRIVATE) != MAP_PRIVATE) &&
+            ((flags & MAP_SHARED) != MAP_SHARED)) ||
+           (len == 0)) {
+               cthread_set_errno_self(EINVAL);
+               return(MAP_FAILED);
+       }
+
+       return(__mmap(addr, len, prot, flags, fildes, off));
+}
+
+#endif /* __DARWIN_UNIX03 */