libsyscall/wrappers/select-base.c

   1 /*
   2  * Copyright (c) 2005, 2007 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #if defined(__LP64__) && (defined(VARIANT_CANCELABLE) || defined(VARIANT_PRE1050))
  25 #undef __DARWIN_NON_CANCELABLE
  26 #define __DARWIN_NON_CANCELABLE 0
  27 #endif /* __LP64__ && (VARIANT_CANCELABLE || VARIANT_PRE1050) */
  28
  29 #include <sys/select.h>
  30 #include "_errno.h"
  31
  32 #if defined(VARIANT_CANCELABLE) || defined(VARIANT_PRE1050)
  33 extern int __select(int, fd_set * __restrict, fd_set * __restrict,
  34         fd_set * __restrict, struct timeval * __restrict);
  35 #else /* !VARIANT_CANCELABLE && !VARIANT_PRE1050 */
  36 int __select_nocancel(int, fd_set * __restrict, fd_set * __restrict,
  37         fd_set * __restrict, struct timeval * __restrict);
  38 #endif /* VARIANT_CANCELABLE || VARIANT_PRE1050 */
  39
  40 /*
  41  * select stub, return error if nfds > FD_SETSIZE
  42  * add pthread cancelability
  43  * mandated for conformance.
  44  *
  45  * This is only for (non DARWINEXTSN) UNIX03 (both cancelable and
  46  * non-cancelable) and for legacy
  47  */
  48 int
  49 select(int nfds, fd_set * __restrict readfds, fd_set * __restrict writefds,
  50         fd_set * __restrict exceptfds, struct timeval * __restrict
  51 #if defined(VARIANT_LEGACY) || defined(VARIANT_PRE1050)
  52         intimeout
  53 #else /* !VARIANT_LEGACY && !VARIANT_PRE1050 */
  54         timeout
  55 #endif /* VARIANT_LEGACY || VARIANT_PRE1050 */
  56         )
  57 {
  58
  59 #if defined(VARIANT_LEGACY) || defined(VARIANT_PRE1050)
  60         struct timeval tb, *timeout;
  61
  62         /*
  63          * Legacy select behavior is minimum 10 msec when tv_usec is non-zero
  64          */
  65         if (intimeout && intimeout->tv_sec == 0 && intimeout->tv_usec > 0 && intimeout->tv_usec < 10000) {
  66                 tb.tv_sec = 0;
  67                 tb.tv_usec = 10000;
  68                 timeout = &tb;
  69         } else
  70                 timeout = intimeout;
  71 #else /* !VARIANT_LEGACY && !VARIANT_PRE1050 */
  72         if (nfds > FD_SETSIZE) {
  73                 errno = EINVAL;
  74                 return -1;
  75         }
  76 #endif /* VARIANT_LEGACY || VARIANT_PRE1050 */
  77 #if defined(VARIANT_CANCELABLE) || defined(VARIANT_PRE1050)
  78         return __select(nfds, readfds, writefds, exceptfds, timeout);
  79 #else /* !VARIANT_CANCELABLE && !VARIANT_PRE1050 */
  80         return __select_nocancel(nfds, readfds, writefds, exceptfds, timeout);
  81 #endif /* VARIANT_CANCELABLE || VARIANT_PRE1050 */
  82 }