rt/aio_fsync.c

   1 /* Synchronize I/O in given file descriptor.
   2    Copyright (C) 1997-2022 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
  20 /* We use an UGLY hack to prevent gcc from finding us cheating.  The
  21    implementation of aio_fsync and aio_fsync64 are identical and so
  22    we want to avoid code duplication by using aliases.  But gcc sees
  23    the different parameter lists and prints a warning.  We define here
  24    a function so that aio_fsync64 has no prototype.  */
  25 #define aio_fsync64 XXX
  26 #include <aio.h>
  27 /* And undo the hack.  */
  28 #undef aio_fsync64
  29 #include <errno.h>
  30 #include <fcntl.h>
  31
  32 #include <aio_misc.h>
  33 #include <shlib-compat.h>
  34
  35 int
  36 __aio_fsync (int op, struct aiocb *aiocbp)
  37 {
  38   if (op != O_DSYNC && __builtin_expect (op != O_SYNC, 0))
  39     {
  40       __set_errno (EINVAL);
  41       return -1;
  42     }
  43
  44   /* Verify that this is an open file descriptor.  */
  45   if (__glibc_unlikely (__fcntl (aiocbp->aio_fildes, F_GETFL) == -1))
  46     {
  47       __set_errno (EBADF);
  48       return -1;
  49     }
  50
  51   return (__aio_enqueue_request ((aiocb_union *) aiocbp,
  52                                  op == O_SYNC ? LIO_SYNC : LIO_DSYNC) == NULL
  53           ? -1 : 0);
  54 }
  55
  56 #if PTHREAD_IN_LIBC
  57 versioned_symbol (libc, __aio_fsync, aio_fsync, GLIBC_2_34);
  58 versioned_symbol (libc, __aio_fsync, aio_fsync64, GLIBC_2_34);
  59 # if OTHER_SHLIB_COMPAT (librt, GLIBC_2_1, GLIBC_2_34)
  60 compat_symbol (librt, __aio_fsync, aio_fsync, GLIBC_2_1);
  61 compat_symbol (librt, __aio_fsync, aio_fsync64, GLIBC_2_1);
  62 # endif
  63 #else /* !PTHREAD_IN_LIBC */
  64 strong_alias (__aio_fsync, aio_fsync)
  65 weak_alias (__aio_fsync, aio_fsync64)
  66 #endif /* !PTHREAD_IN_LIBC */