xnu-1699.22.73.tar.gz

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

diff --git a/libsyscall/wrappers/unix03/fchmod.c b/libsyscall/wrappers/unix03/fchmod.c
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+++ b/libsyscall/wrappers/unix03/fchmod.c
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+/*
+ * Copyright (c) 2005 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/types.h>
+#include <sys/stat.h>
+#include "_errno.h"
+
+extern int __fchmod(int fd, mode_t mode);
+
+/*
+ * fchmod stub, ignore S_ISUID and/or S_ISGID on EPERM,
+ * mandated for conformance.
+ *
+ * This is for UNIX03 only.
+ */
+int
+fchmod(int fd, mode_t mode)
+{
+       int res = __fchmod(fd, mode);
+
+       if (res >= 0 || errno != EPERM || (mode & (S_ISUID | S_ISGID)) == 0)
+               return res;
+       if (mode & S_ISGID) {
+               res = __fchmod(fd, mode ^ S_ISGID);
+               if (res >= 0 || errno != EPERM)
+                       return res;
+       }
+       if (mode & S_ISUID) {
+               res = __fchmod(fd, mode ^ S_ISUID);
+               if (res >= 0 || errno != EPERM)
+                       return res;
+       }
+       if ((mode & (S_ISUID | S_ISGID)) == (S_ISUID | S_ISGID))
+               res = __fchmod(fd, mode ^ (S_ISUID | S_ISGID));
+       return res;
+}
+
+#endif /* __DARWIN_UNIX03 */