xnu-1699.22.73.tar.gz

[apple/xnu.git] / libsyscall / wrappers / select-base.c

diff --git a/libsyscall/wrappers/select-base.c b/libsyscall/wrappers/select-base.c
new file mode 100644 (file)
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--- /dev/null
+++ b/libsyscall/wrappers/select-base.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2005, 2007 Apple 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@
+ */
+
+#if defined(__LP64__) && (defined(VARIANT_CANCELABLE) || defined(VARIANT_PRE1050))
+#undef __DARWIN_NON_CANCELABLE
+#define __DARWIN_NON_CANCELABLE 0
+#endif /* __LP64__ && (VARIANT_CANCELABLE || VARIANT_PRE1050) */
+
+#include <sys/select.h>
+#include "_errno.h"
+
+#if defined(VARIANT_CANCELABLE) || defined(VARIANT_PRE1050)
+extern int __select(int, fd_set * __restrict, fd_set * __restrict,
+       fd_set * __restrict, struct timeval * __restrict);
+#else /* !VARIANT_CANCELABLE && !VARIANT_PRE1050 */
+int __select_nocancel(int, fd_set * __restrict, fd_set * __restrict,
+       fd_set * __restrict, struct timeval * __restrict);
+#endif /* VARIANT_CANCELABLE || VARIANT_PRE1050 */
+
+/*
+ * select stub, return error if nfds > FD_SETSIZE
+ * add pthread cancelability
+ * mandated for conformance.
+ *
+ * This is only for (non DARWINEXTSN) UNIX03 (both cancelable and
+ * non-cancelable) and for legacy
+ */
+int
+select(int nfds, fd_set * __restrict readfds, fd_set * __restrict writefds,
+       fd_set * __restrict exceptfds, struct timeval * __restrict
+#if defined(VARIANT_LEGACY) || defined(VARIANT_PRE1050)
+       intimeout
+#else /* !VARIANT_LEGACY && !VARIANT_PRE1050 */
+       timeout
+#endif /* VARIANT_LEGACY || VARIANT_PRE1050 */
+       )
+{
+
+#if defined(VARIANT_LEGACY) || defined(VARIANT_PRE1050)
+       struct timeval tb, *timeout;
+
+       /*
+        * Legacy select behavior is minimum 10 msec when tv_usec is non-zero
+        */
+       if (intimeout && intimeout->tv_sec == 0 && intimeout->tv_usec > 0 && intimeout->tv_usec < 10000) {
+               tb.tv_sec = 0;
+               tb.tv_usec = 10000;
+               timeout = &tb;
+       } else
+               timeout = intimeout;
+#else /* !VARIANT_LEGACY && !VARIANT_PRE1050 */
+       if (nfds > FD_SETSIZE) {
+               errno = EINVAL;
+               return -1;
+       }
+#endif /* VARIANT_LEGACY || VARIANT_PRE1050 */
+#if defined(VARIANT_CANCELABLE) || defined(VARIANT_PRE1050)
+       return __select(nfds, readfds, writefds, exceptfds, timeout);
+#else /* !VARIANT_CANCELABLE && !VARIANT_PRE1050 */
+       return __select_nocancel(nfds, readfds, writefds, exceptfds, timeout);
+#endif /* VARIANT_CANCELABLE || VARIANT_PRE1050 */
+}