sysdeps/unix/sysv/linux/preadv64.c

   1 /* Copyright (C) 2016-2024 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <sys/uio.h>
  19 #include <sysdep-cancel.h>
  20
  21 #ifdef __ASSUME_PREADV
  22
  23 ssize_t
  24 preadv64 (int fd, const struct iovec *vector, int count, off64_t offset)
  25 {
  26   return SYSCALL_CANCEL (preadv, fd, vector, count, LO_HI_LONG (offset));
  27 }
  28 #else
  29 static ssize_t __atomic_preadv64_replacement (int, const struct iovec *,
  30                                               int, off64_t);
  31 ssize_t
  32 preadv64 (int fd, const struct iovec *vector, int count, off64_t offset)
  33 {
  34   ssize_t result = SYSCALL_CANCEL (preadv, fd, vector, count,
  35                                    LO_HI_LONG (offset));
  36   if (result >= 0 || errno != ENOSYS)
  37     return result;
  38   return __atomic_preadv64_replacement (fd, vector, count, offset);
  39 }
  40 # define PREADV static __atomic_preadv64_replacement
  41 # define PREAD __pread64
  42 # define OFF_T off64_t
  43 # include <sysdeps/posix/preadv_common.c>
  44 #endif
  45 libc_hidden_def (preadv64)
  46
  47 #ifdef __OFF_T_MATCHES_OFF64_T
  48 strong_alias (preadv64, preadv)
  49 libc_hidden_def (preadv)
  50 #endif