1cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project/* Invoke fopen, but avoid some glitches. 2cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project 305436638acc7c010349a69c3395f1a57c642dc62Ying Wang Copyright (C) 2001, 2004-2006, 2009-2012 Free Software Foundation, Inc. 405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 505436638acc7c010349a69c3395f1a57c642dc62Ying Wang This program is free software: you can redistribute it and/or modify 6cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project it under the terms of the GNU General Public License as published by 705436638acc7c010349a69c3395f1a57c642dc62Ying Wang the Free Software Foundation; either version 3 of the License, or 805436638acc7c010349a69c3395f1a57c642dc62Ying Wang (at your option) any later version. 9cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project 10cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project This program is distributed in the hope that it will be useful, 11cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project but WITHOUT ANY WARRANTY; without even the implied warranty of 12cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project GNU General Public License for more details. 14cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project 15cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project You should have received a copy of the GNU General Public License 1605436638acc7c010349a69c3395f1a57c642dc62Ying Wang along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project 18cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project/* Written by Paul Eggert. */ 19cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project 2005436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <config.h> 21cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project 22cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project#include "stdio-safer.h" 23cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project 24cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project#include <errno.h> 25cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project#include <unistd.h> 26cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project#include "unistd-safer.h" 27cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project 28cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project/* Like fopen, but do not return stdin, stdout, or stderr. */ 29cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project 30cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source ProjectFILE * 31cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Projectfopen_safer (char const *file, char const *mode) 32cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project{ 33cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project FILE *fp = fopen (file, mode); 34cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project 35cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project if (fp) 36cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project { 37cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project int fd = fileno (fp); 38cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project 39cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project if (0 <= fd && fd <= STDERR_FILENO) 4005436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 4105436638acc7c010349a69c3395f1a57c642dc62Ying Wang int f = dup_safer (fd); 4205436638acc7c010349a69c3395f1a57c642dc62Ying Wang 4305436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (f < 0) 4405436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 4505436638acc7c010349a69c3395f1a57c642dc62Ying Wang int e = errno; 4605436638acc7c010349a69c3395f1a57c642dc62Ying Wang fclose (fp); 4705436638acc7c010349a69c3395f1a57c642dc62Ying Wang errno = e; 4805436638acc7c010349a69c3395f1a57c642dc62Ying Wang return NULL; 4905436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 5005436638acc7c010349a69c3395f1a57c642dc62Ying Wang 5105436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (fclose (fp) != 0 5205436638acc7c010349a69c3395f1a57c642dc62Ying Wang || ! (fp = fdopen (f, mode))) 5305436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 5405436638acc7c010349a69c3395f1a57c642dc62Ying Wang int e = errno; 5505436638acc7c010349a69c3395f1a57c642dc62Ying Wang close (f); 5605436638acc7c010349a69c3395f1a57c642dc62Ying Wang errno = e; 5705436638acc7c010349a69c3395f1a57c642dc62Ying Wang return NULL; 5805436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 5905436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 60cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project } 61cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project 62cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project return fp; 63cea198a11f15a2eb071d98491ca9a8bc8cebfbc4The Android Open Source Project} 64