1  /* Copyright (C) 2009-2023 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  #ifndef __OFF_T_MATCHES_OFF64_T
      22  
      23  # ifdef __ASSUME_PREADV
      24  
      25  ssize_t
      26  preadv (int fd, const struct iovec *vector, int count, off_t offset)
      27  {
      28    return SYSCALL_CANCEL (preadv, fd, vector, count, LO_HI_LONG (offset));
      29  }
      30  # else
      31  static ssize_t __atomic_preadv_replacement (int, const struct iovec *,
      32  					    int, off_t);
      33  ssize_t
      34  preadv (int fd, const struct iovec *vector, int count, off_t offset)
      35  {
      36    ssize_t result = SYSCALL_CANCEL (preadv, fd, vector, count,
      37  				   LO_HI_LONG (offset));
      38    if (result >= 0 || errno != ENOSYS)
      39      return result;
      40    return __atomic_preadv_replacement (fd, vector, count, offset);
      41  }
      42  #  define PREADV static __atomic_preadv_replacement
      43  #  define PREAD __pread
      44  #  define OFF_T off_t
      45  #  include <sysdeps/posix/preadv_common.c>
      46  # endif /* __ASSUME_PREADV  */
      47  
      48  libc_hidden_def (preadv)
      49  #endif