1  /* mmap - map files or devices into memory.  Linux version.
       2     Copyright (C) 2017-2023 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 <errno.h>
      20  #include <unistd.h>
      21  #include <sys/mman.h>
      22  #include <sysdep.h>
      23  #include <stdint.h>
      24  
      25  #ifndef __OFF_T_MATCHES_OFF64_T
      26  # include <mmap_internal.h>
      27  
      28  /* An architecture may override this.  */
      29  # ifndef MMAP_ADJUST_OFFSET
      30  #  define MMAP_ADJUST_OFFSET(offset) offset
      31  # endif
      32  
      33  void *
      34  __mmap (void *addr, size_t len, int prot, int flags, int fd, off_t offset)
      35  {
      36    MMAP_CHECK_PAGE_UNIT ();
      37  
      38    if (offset & MMAP_OFF_LOW_MASK)
      39      return (void *) INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
      40  
      41  #ifdef __NR_mmap2
      42    return (void *) MMAP_CALL (mmap2, addr, len, prot, flags, fd,
      43  			     offset / (uint32_t) MMAP2_PAGE_UNIT);
      44  #else
      45    return (void *) MMAP_CALL (mmap, addr, len, prot, flags, fd,
      46  			     MMAP_ADJUST_OFFSET (offset));
      47  #endif
      48  }
      49  weak_alias (__mmap, mmap)
      50  libc_hidden_def (__mmap)
      51  
      52  #endif /* __OFF_T_MATCHES_OFF64_T  */