libc/hdr/fcntl_overlay.h

   1 //===-- Including fcntl.h in overlay mode ---------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef LLVM_LIBC_HDR_FCNTL_OVERLAY_H
  10 #define LLVM_LIBC_HDR_FCNTL_OVERLAY_H
  11
  12 #ifdef LIBC_FULL_BUILD
  13 #error "This header should only be included in overlay mode"
  14 #endif
  15
  16 // Overlay mode
  17
  18 // glibc <fcntl.h> header might provide extern inline definitions for few
  19 // functions, causing external alias errors.  They are guarded by
  20 // `__USE_FORTIFY_LEVEL`, which will be temporarily disabled
  21 // with `_FORTIFY_SOURCE`.
  22
  23 #ifdef _FORTIFY_SOURCE
  24 #define LIBC_OLD_FORTIFY_SOURCE _FORTIFY_SOURCE
  25 #undef _FORTIFY_SOURCE
  26 #endif
  27
  28 #ifdef __USE_FORTIFY_LEVEL
  29 #define LIBC_OLD_USE_FORTIFY_LEVEL __USE_FORTIFY_LEVEL
  30 #undef __USE_FORTIFY_LEVEL
  31 #define __USE_FORTIFY_LEVEL 0
  32 #endif
  33
  34 #include <fcntl.h>
  35
  36 #ifdef LIBC_OLD_FORTIFY_SOURCE
  37 #define _FORTIFY_SOURCE LIBC_OLD_FORTIFY_SOURCE
  38 #undef LIBC_OLD_FORTIFY_SOURCE
  39 #endif
  40
  41 #ifdef LIBC_OLD_USE_FORTIFY_LEVEL
  42 #undef __USE_FORTIFY_LEVEL
  43 #define __USE_FORTIFY_LEVEL LIBC_OLD_USE_FORTIFY_LEVEL
  44 #undef LIBC_OLD_USE_FORTIFY_LEVEL
  45 #endif
  46
  47 #endif // LLVM_LIBC_HDR_FCNTL_OVERLAY_H