| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <sys/xattr.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stdio.h> |
| |
| #include "private/FdPath.h" |
| |
| extern "C" ssize_t ___fgetxattr(int, const char*, void*, size_t); |
| |
| ssize_t fgetxattr(int fd, const char *name, void *value, size_t size) { |
| int saved_errno = errno; |
| ssize_t result = ___fgetxattr(fd, name, value, size); |
| |
| if (result != -1 || errno != EBADF) { |
| return result; |
| } |
| |
| // fd could be an O_PATH file descriptor, and the kernel |
| // may not directly support fgetxattr() on such a file descriptor. |
| // Use /proc/self/fd instead to emulate this support. |
| int fd_flag = fcntl(fd, F_GETFL); |
| if (fd_flag == -1 || (fd_flag & O_PATH) == 0) { |
| errno = EBADF; |
| return -1; |
| } |
| |
| errno = saved_errno; |
| return getxattr(FdPath(fd).c_str(), name, value, size); |
| } |