1  /* Checking macros for unistd functions.
       2     Copyright (C) 2005-2023 Free Software Foundation, Inc.
       3  
       4  This file is part of GCC.
       5  
       6  GCC is free software; you can redistribute it and/or modify it under
       7  the terms of the GNU General Public License as published by the Free
       8  Software Foundation; either version 3, or (at your option) any later
       9  version.
      10  
      11  In addition to the permissions in the GNU General Public License, the
      12  Free Software Foundation gives you unlimited permission to link the
      13  compiled version of this file into combinations with other programs,
      14  and to distribute those combinations without any restriction coming
      15  from the use of this file.  (The General Public License restrictions
      16  do apply in other respects; for example, they cover modification of
      17  the file, and distribution when not linked into a combine
      18  executable.)
      19  
      20  GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      21  WARRANTY; without even the implied warranty of MERCHANTABILITY or
      22  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      23  for more details.
      24  
      25  Under Section 7 of GPL version 3, you are granted additional
      26  permissions described in the GCC Runtime Library Exception, version
      27  3.1, as published by the Free Software Foundation.
      28  
      29  You should have received a copy of the GNU General Public License and
      30  a copy of the GCC Runtime Library Exception along with this program;
      31  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      32  <http://www.gnu.org/licenses/>.  */
      33  
      34  
      35  #ifndef _SSP_UNISTD_H
      36  #define _SSP_UNISTD_H 1
      37  
      38  #include <ssp.h>
      39  #include_next <unistd.h>
      40  
      41  #if __SSP_FORTIFY_LEVEL > 0
      42  
      43  #undef read
      44  #undef readlink
      45  #undef getcwd
      46  
      47  extern ssize_t __SSP_REDIRECT (__read_alias, (int __fd, void *__buf,
      48  					      size_t __nbytes), read);
      49  
      50  extern inline __attribute__((__always_inline__)) ssize_t
      51  read (int __fd, void *__buf, size_t __nbytes)
      52  {
      53    if (__ssp_bos0 (__buf) != (size_t) -1 && __nbytes > __ssp_bos0 (__buf))
      54      __chk_fail ();
      55    return __read_alias (__fd, __buf, __nbytes);
      56  }
      57  
      58  extern int __SSP_REDIRECT (__readlink_alias,
      59  			   (const char *__restrict__ __path,
      60  			    char *__restrict__ __buf, size_t __len),
      61  			   readlink);
      62  
      63  extern inline __attribute__((__always_inline__)) int
      64  readlink (const char *__restrict__ __path, char *__restrict__ __buf,
      65  	  size_t __len)
      66  {
      67    if (__ssp_bos (__buf) != (size_t) -1 && __len > __ssp_bos (__buf))
      68      __chk_fail ();
      69    return __readlink_alias (__path, __buf, __len);
      70  }
      71  
      72  extern char *__SSP_REDIRECT (__getcwd_alias,
      73  			     (char *__buf, size_t __size), getcwd);
      74  
      75  extern inline __attribute__((__always_inline__)) char *
      76  getcwd (char *__buf, size_t __size)
      77  {
      78    if (__ssp_bos (__buf) != (size_t) -1 && __size > __ssp_bos (__buf))
      79      __chk_fail ();
      80    return __getcwd_alias (__buf, __size);
      81  }
      82  
      83  #endif /* __SSP_FORTIFY_LEVEL > 0 */
      84  #endif /* _SSP_UNISTD_H */