io/bits/fcntl2.h

   1 /* Checking macros for fcntl functions.
   2    Copyright (C) 2007-2015 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _FCNTL_H
  20 # error "Never include <bits/fcntl2.h> directly; use <fcntl.h> instead."
  21 #endif
  22
  23 /* Check that calls to open and openat with O_CREAT set have an
  24    appropriate third/fourth parameter.  */
  25 #ifndef __USE_FILE_OFFSET64
  26 extern int __open_2 (const char *__path, int __oflag) __nonnull ((1));
  27 extern int __REDIRECT (__open_alias, (const char *__path, int __oflag, ...),
  28                        open) __nonnull ((1));
  29 #else
  30 extern int __REDIRECT (__open_2, (const char *__path, int __oflag),
  31                        __open64_2) __nonnull ((1));
  32 extern int __REDIRECT (__open_alias, (const char *__path, int __oflag, ...),
  33                        open64) __nonnull ((1));
  34 #endif
  35 __errordecl (__open_too_many_args,
  36              "open can be called either with 2 or 3 arguments, not more");
  37 __errordecl (__open_missing_mode,
  38              "open with O_CREAT in second argument needs 3 arguments");
  39
  40 __fortify_function int
  41 open (const char *__path, int __oflag, ...)
  42 {
  43   if (__va_arg_pack_len () > 1)
  44     __open_too_many_args ();
  45
  46   if (__builtin_constant_p (__oflag))
  47     {
  48       if ((__oflag & O_CREAT) != 0 && __va_arg_pack_len () < 1)
  49         {
  50           __open_missing_mode ();
  51           return __open_2 (__path, __oflag);
  52         }
  53       return __open_alias (__path, __oflag, __va_arg_pack ());
  54     }
  55
  56   if (__va_arg_pack_len () < 1)
  57     return __open_2 (__path, __oflag);
  58
  59   return __open_alias (__path, __oflag, __va_arg_pack ());
  60 }
  61
  62
  63 #ifdef __USE_LARGEFILE64
  64 extern int __open64_2 (const char *__path, int __oflag) __nonnull ((1));
  65 extern int __REDIRECT (__open64_alias, (const char *__path, int __oflag,
  66                                         ...), open64) __nonnull ((1));
  67 __errordecl (__open64_too_many_args,
  68              "open64 can be called either with 2 or 3 arguments, not more");
  69 __errordecl (__open64_missing_mode,
  70              "open64 with O_CREAT in second argument needs 3 arguments");
  71
  72 __fortify_function int
  73 open64 (const char *__path, int __oflag, ...)
  74 {
  75   if (__va_arg_pack_len () > 1)
  76     __open64_too_many_args ();
  77
  78   if (__builtin_constant_p (__oflag))
  79     {
  80       if ((__oflag & O_CREAT) != 0 && __va_arg_pack_len () < 1)
  81         {
  82           __open64_missing_mode ();
  83           return __open64_2 (__path, __oflag);
  84         }
  85       return __open64_alias (__path, __oflag, __va_arg_pack ());
  86     }
  87
  88   if (__va_arg_pack_len () < 1)
  89     return __open64_2 (__path, __oflag);
  90
  91   return __open64_alias (__path, __oflag, __va_arg_pack ());
  92 }
  93 #endif
  94
  95
  96 #ifdef __USE_ATFILE
  97 # ifndef __USE_FILE_OFFSET64
  98 extern int __openat_2 (int __fd, const char *__path, int __oflag)
  99      __nonnull ((2));
 100 extern int __REDIRECT (__openat_alias, (int __fd, const char *__path,
 101                                         int __oflag, ...), openat)
 102      __nonnull ((2));
 103 # else
 104 extern int __REDIRECT (__openat_2, (int __fd, const char *__path,
 105                                     int __oflag), __openat64_2)
 106      __nonnull ((2));
 107 extern int __REDIRECT (__openat_alias, (int __fd, const char *__path,
 108                                         int __oflag, ...), openat64)
 109      __nonnull ((2));
 110 # endif
 111 __errordecl (__openat_too_many_args,
 112              "openat can be called either with 3 or 4 arguments, not more");
 113 __errordecl (__openat_missing_mode,
 114              "openat with O_CREAT in third argument needs 4 arguments");
 115
 116 __fortify_function int
 117 openat (int __fd, const char *__path, int __oflag, ...)
 118 {
 119   if (__va_arg_pack_len () > 1)
 120     __openat_too_many_args ();
 121
 122   if (__builtin_constant_p (__oflag))
 123     {
 124       if ((__oflag & O_CREAT) != 0 && __va_arg_pack_len () < 1)
 125         {
 126           __openat_missing_mode ();
 127           return __openat_2 (__fd, __path, __oflag);
 128         }
 129       return __openat_alias (__fd, __path, __oflag, __va_arg_pack ());
 130     }
 131
 132   if (__va_arg_pack_len () < 1)
 133     return __openat_2 (__fd, __path, __oflag);
 134
 135   return __openat_alias (__fd, __path, __oflag, __va_arg_pack ());
 136 }
 137
 138
 139 # ifdef __USE_LARGEFILE64
 140 extern int __openat64_2 (int __fd, const char *__path, int __oflag)
 141      __nonnull ((2));
 142 extern int __REDIRECT (__openat64_alias, (int __fd, const char *__path,
 143                                           int __oflag, ...), openat64)
 144      __nonnull ((2));
 145 __errordecl (__openat64_too_many_args,
 146              "openat64 can be called either with 3 or 4 arguments, not more");
 147 __errordecl (__openat64_missing_mode,
 148              "openat64 with O_CREAT in third argument needs 4 arguments");
 149
 150 __fortify_function int
 151 openat64 (int __fd, const char *__path, int __oflag, ...)
 152 {
 153   if (__va_arg_pack_len () > 1)
 154     __openat64_too_many_args ();
 155
 156   if (__builtin_constant_p (__oflag))
 157     {
 158       if ((__oflag & O_CREAT) != 0 && __va_arg_pack_len () < 1)
 159         {
 160           __openat64_missing_mode ();
 161           return __openat64_2 (__fd, __path, __oflag);
 162         }
 163       return __openat64_alias (__fd, __path, __oflag, __va_arg_pack ());
 164     }
 165
 166   if (__va_arg_pack_len () < 1)
 167     return __openat64_2 (__fd, __path, __oflag);
 168
 169   return __openat64_alias (__fd, __path, __oflag, __va_arg_pack ());
 170 }
 171 # endif
 172 #endif