sysdeps/unix/pt-fcntl.c

   1 /* ABI compatibility for 'fcntl' symbol in libpthread ABI.
   2    Copyright (C) 2018-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <fcntl.h>
  20 #include <stdarg.h>
  21 #include <shlib-compat.h>
  22
  23 /* libpthread once had its own fcntl, though there was no apparent reason
  24    for it.  There is no use in having a separate symbol in libpthread, but
  25    the historical ABI requires it.  For static linking, there is no need to
  26    provide anything here--the libc version will be linked in.  For shared
  27    library ABI compatibility, there must be __fcntl and fcntl symbols in
  28    libpthread.so.  */
  29
  30 #if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_28)
  31
  32 static int
  33 fcntl_compat (int fd, int cmd, ...)
  34 {
  35   void *arg;
  36   va_list ap;
  37   va_start (ap, cmd);
  38   arg = va_arg (ap, void *);
  39   va_end (ap);
  40   return __libc_fcntl64 (fd, cmd, arg);
  41 }
  42
  43 weak_alias (fcntl_compat, fcntl_alias)
  44 compat_symbol (libpthread, fcntl_alias, fcntl, GLIBC_2_0);
  45
  46 weak_alias (fcntl_compat, __fcntl_alias)
  47 compat_symbol (libpthread, __fcntl_alias, __fcntl, GLIBC_2_0);
  48
  49 #endif