diff options
Diffstat (limited to 'misc/bits/select2.h')
| -rw-r--r-- | misc/bits/select2.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/misc/bits/select2.h b/misc/bits/select2.h new file mode 100644 index 0000000000..27f42018f2 --- /dev/null +++ b/misc/bits/select2.h @@ -0,0 +1,34 @@ +/* Checking macros for select functions. + Copyright (C) 2011 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#ifndef _SYS_SELECT_H +# error "Never include <bits/select2.h> directly; use <sys/select.h> instead." +#endif + +/* Helper functions to issue warnings and errors when needed. */ +extern unsigned long int __fdelt_chk (unsigned long int __d); +extern unsigned long int __fdelt_warn (unsigned long int __d) + __warnattr ("bit outside of fd_set selected"); +#undef __FDELT +#define __FDELT(d) \ + ({ unsigned long int __d = d; \ + (__builtin_constant_p (__d) \ + ? (__d >= __FD_SETSIZE \ + ? __fdelt_warn (__d) : (__d / __NFDBITS)) \ + : __fdelt_chk (__d)); }) |