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35 lines
1.4 KiB
C
35 lines
1.4 KiB
C
/* Checking macros for select functions.
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Copyright (C) 2011 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _SYS_SELECT_H
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# error "Never include <bits/select2.h> directly; use <sys/select.h> instead."
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#endif
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/* Helper functions to issue warnings and errors when needed. */
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extern unsigned long int __fdelt_chk (unsigned long int __d);
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extern unsigned long int __fdelt_warn (unsigned long int __d)
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__warnattr ("bit outside of fd_set selected");
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#undef __FD_ELT
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#define __FD_ELT(d) \
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__extension__ \
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({ unsigned long int __d = (d); \
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(__builtin_constant_p (__d) \
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? (__d >= __FD_SETSIZE \
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? __fdelt_warn (__d) : (__d / __NFDBITS)) \
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: __fdelt_chk (__d)); })
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