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 3 of the License, or 8 (at your option) 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, see <http://www.gnu.org/licenses/>. */ 17 18/* Written by Paul Eggert. */ 19 20#include <config.h> 21 22#include "fcntl-safer.h" 23 24#include <fcntl.h> 25#include <stdarg.h> 26#include "unistd-safer.h" 27 28int 29open_safer (char const *file, int flags, ...) 30{ 31 mode_t mode = 0; 32 33 if (flags & O_CREAT) 34 { 35 va_list ap; 36 va_start (ap, flags); 37 38 /* Assume mode_t promotes to int if and only if it is smaller. 39 This assumption isn't guaranteed by the C standard, but we 40 don't know of any real-world counterexamples. */ 41 mode = (sizeof (mode_t) < sizeof (int) 42 ? va_arg (ap, int) 43 : va_arg (ap, mode_t)); 44 45 va_end (ap); 46 } 47 48 return fd_safer (open (file, flags, mode)); 49} 50