1 /* Duplicate a file descriptor result, avoiding clobbering 2 STD{IN,OUT,ERR}_FILENO, with specific flags. 3 4 Copyright (C) 2001, 2004-2006, 2009-2012 Free Software Foundation, Inc. 5 6 This program is free software: you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 18 19 /* Written by Paul Eggert and Eric Blake. */ 20 21 #include <config.h> 22 23 /* Specification. */ 24 #include "unistd-safer.h" 25 26 #include <fcntl.h> 27 #include <unistd.h> 28 29 /* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or 30 STDERR_FILENO. If FLAG contains O_CLOEXEC, behave like 31 fcntl(F_DUPFD_CLOEXEC) rather than fcntl(F_DUPFD). */ 32 33 int 34 dup_safer_flag (int fd, int flag) 35 { 36 return fcntl (fd, (flag & O_CLOEXEC) ? F_DUPFD_CLOEXEC : F_DUPFD, 37 STDERR_FILENO + 1); 38 } 39
