1/* Invoke open, but avoid some glitches. 2 3 Copyright (C) 2005, 2006 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 2, or (at your option) 8 any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, write to the Free Software Foundation, 17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ 18 19/* Written by Paul Eggert. */ 20 21#include <config.h> 22 23#include "fcntl-safer.h" 24 25#include <fcntl.h> 26#include <stdarg.h> 27#include "unistd-safer.h" 28 29int 30open_safer (char const *file, int flags, ...) 31{ 32 mode_t mode = 0; 33 34 if (flags & O_CREAT) 35 { 36 va_list ap; 37 va_start (ap, flags); 38 39 /* Assume mode_t promotes to int if and only if it is smaller. 40 This assumption isn't guaranteed by the C standard, but we 41 don't know of any real-world counterexamples. */ 42 mode = (sizeof (mode_t) < sizeof (int) 43 ? va_arg (ap, int) 44 : va_arg (ap, mode_t)); 45 46 va_end (ap); 47 } 48 49 return fd_safer (open (file, flags, mode)); 50} 51