105436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Invoke pipe2, but avoid some glitches. 205436638acc7c010349a69c3395f1a57c642dc62Ying Wang Copyright (C) 2005-2006, 2009-2012 Free Software Foundation, Inc. 305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 405436638acc7c010349a69c3395f1a57c642dc62Ying Wang This program is free software: you can redistribute it and/or modify 505436638acc7c010349a69c3395f1a57c642dc62Ying Wang it under the terms of the GNU General Public License as published by 605436638acc7c010349a69c3395f1a57c642dc62Ying Wang the Free Software Foundation; either version 3 of the License, or 705436638acc7c010349a69c3395f1a57c642dc62Ying Wang (at your option) any later version. 805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 905436638acc7c010349a69c3395f1a57c642dc62Ying Wang This program is distributed in the hope that it will be useful, 1005436638acc7c010349a69c3395f1a57c642dc62Ying Wang but WITHOUT ANY WARRANTY; without even the implied warranty of 1105436638acc7c010349a69c3395f1a57c642dc62Ying Wang MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1205436638acc7c010349a69c3395f1a57c642dc62Ying Wang GNU General Public License for more details. 1305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1405436638acc7c010349a69c3395f1a57c642dc62Ying Wang You should have received a copy of the GNU General Public License 1505436638acc7c010349a69c3395f1a57c642dc62Ying Wang along with this program. If not, see <http://www.gnu.org/licenses/>. */ 1605436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1705436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Written by Eric Blake. */ 1805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1905436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <config.h> 2005436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2105436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Specification. */ 2205436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include "unistd-safer.h" 2305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2405436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <unistd.h> 2505436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <errno.h> 2605436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2705436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Like pipe2, but ensure that neither of the file descriptors is 2805436638acc7c010349a69c3395f1a57c642dc62Ying Wang STDIN_FILENO, STDOUT_FILENO, or STDERR_FILENO. */ 2905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 3005436638acc7c010349a69c3395f1a57c642dc62Ying Wangint 3105436638acc7c010349a69c3395f1a57c642dc62Ying Wangpipe2_safer (int fd[2], int flags) 3205436638acc7c010349a69c3395f1a57c642dc62Ying Wang{ 3305436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* This is a generalization of the pipe_safer implementation. */ 3405436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (pipe2 (fd, flags) == 0) 3505436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 3605436638acc7c010349a69c3395f1a57c642dc62Ying Wang int i; 3705436638acc7c010349a69c3395f1a57c642dc62Ying Wang for (i = 0; i < 2; i++) 3805436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 3905436638acc7c010349a69c3395f1a57c642dc62Ying Wang fd[i] = fd_safer_flag (fd[i], flags); 4005436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (fd[i] < 0) 4105436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 4205436638acc7c010349a69c3395f1a57c642dc62Ying Wang int e = errno; 4305436638acc7c010349a69c3395f1a57c642dc62Ying Wang close (fd[1 - i]); 4405436638acc7c010349a69c3395f1a57c642dc62Ying Wang errno = e; 4505436638acc7c010349a69c3395f1a57c642dc62Ying Wang return -1; 4605436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 4705436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 4805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 4905436638acc7c010349a69c3395f1a57c642dc62Ying Wang return 0; 5005436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 5105436638acc7c010349a69c3395f1a57c642dc62Ying Wang return -1; 5205436638acc7c010349a69c3395f1a57c642dc62Ying Wang} 53