1 /* Invoke openat, but avoid some glitches. 2 3 Copyright (C) 2005-2006, 2008-2021 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 <https://www.gnu.org/licenses/>. */ 17 18 /* Written by Paul Eggert for open, ported by Eric Blake for openat. */ 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 28 int 29 openat_safer (int fd, 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 /* We have to use PROMOTED_MODE_T instead of mode_t, otherwise GCC 4 39 creates crashing code when 'mode_t' is smaller than 'int'. */ 40 mode = va_arg (ap, PROMOTED_MODE_T); 41 42 va_end (ap); 43 } 44 45 return fd_safer (openat (fd, file, flags, mode)); 46 }