io/bits/fcntl2.h

   1 /* Checking macros for fcntl functions.
   2    Copyright (C) 2007 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _FCNTL_H
  21 # error "Never include <bits/fcntl2.h> directly; use <fcntl.h> instead."
  22 #endif
  23
  24 /* Check that calls to open and openat with O_CREAT set have an
  25    appropriate third/fourth parameter.  */
  26 #ifndef __USE_FILE_OFFSET64
  27 extern int __open_2 (__const char *__path, int __oflag) __nonnull ((1));
  28 extern int __REDIRECT (__open_alias, (__const char *__path, int __oflag, ...),
  29                        open) __nonnull ((1));
  30 #else
  31 extern int __REDIRECT (__open_2, (__const char *__path, int __oflag),
  32                        __open64_2) __nonnull ((1));
  33 extern int __REDIRECT (__open_alias, (__const char *__path, int __oflag, ...),
  34                        open64) __nonnull ((1));
  35 #endif
  36 __errordecl (__open_too_many_args,
  37              "open can be called either with 2 or 3 arguments, not more");
  38 __errordecl (__open_missing_mode,
  39              "open with O_CREAT in second argument needs 3 arguments");
  40
  41 __extern_always_inline int
  42 open (__const char *__path, int __oflag, ...)
  43 {
  44   if (__va_arg_pack_len () > 1)
  45     __open_too_many_args ();
  46
  47   if (__builtin_constant_p (__oflag))
  48     {
  49       if ((__oflag & O_CREAT) != 0 && __va_arg_pack_len () < 1)
  50         {
  51           __open_missing_mode ();
  52           return __open_2 (__path, __oflag);
  53         }
  54       return __open_alias (__path, __oflag, __va_arg_pack ());
  55     }
  56
  57   if (__va_arg_pack_len () < 1)
  58     return __open_2 (__path, __oflag);
  59
  60   return __open_alias (__path, __oflag, __va_arg_pack ());
  61 }
  62
  63
  64 #ifdef __USE_LARGEFILE64
  65 extern int __open64_2 (__const char *__path, int __oflag) __nonnull ((1));
  66 extern int __REDIRECT (__open64_alias, (__const char *__path, int __oflag,
  67                                         ...), open64) __nonnull ((1));
  68 __errordecl (__open64_too_many_args,
  69              "open64 can be called either with 2 or 3 arguments, not more");
  70 __errordecl (__open64_missing_mode,
  71              "open64 with O_CREAT in second argument needs 3 arguments");
  72
  73 __extern_always_inline int
  74 open64 (__const char *__path, int __oflag, ...)
  75 {
  76   if (__va_arg_pack_len () > 1)
  77     __open64_too_many_args ();
  78
  79   if (__builtin_constant_p (__oflag))
  80     {
  81       if ((__oflag & O_CREAT) != 0 && __va_arg_pack_len () < 1)
  82         {
  83           __open64_missing_mode ();
  84           return __open64_2 (__path, __oflag);
  85         }
  86       return __open64_alias (__path, __oflag, __va_arg_pack ());
  87     }
  88
  89   if (__va_arg_pack_len () < 1)
  90     return __open64_2 (__path, __oflag);
  91
  92   return __open64_alias (__path, __oflag, __va_arg_pack ());
  93 }
  94 #endif
  95
  96
  97 #ifdef __USE_ATFILE
  98 # ifndef __USE_FILE_OFFSET64
  99 extern int __openat_2 (int __fd, __const char *__path, int __oflag)
 100      __nonnull ((2));
 101 extern int __REDIRECT (__openat_alias, (int __fd, __const char *__path,
 102                                         int __oflag, ...), openat)
 103      __nonnull ((2));
 104 # else
 105 extern int __REDIRECT (__openat_2, (int __fd, __const char *__path,
 106                                     int __oflag), __openat64_2)
 107      __nonnull ((2));
 108 extern int __REDIRECT (__openat_alias, (int __fd, __const char *__path,
 109                                         int __oflag, ...), openat64)
 110      __nonnull ((2));
 111 # endif
 112 __errordecl (__openat_too_many_args,
 113              "openat can be called either with 3 or 4 arguments, not more");
 114 __errordecl (__openat_missing_mode,
 115              "openat with O_CREAT in third argument needs 4 arguments");
 116
 117 __extern_always_inline int
 118 openat (int __fd, __const char *__path, int __oflag, ...)
 119 {
 120   if (__va_arg_pack_len () > 1)
 121     __openat_too_many_args ();
 122
 123   if (__builtin_constant_p (__oflag))
 124     {
 125       if ((__oflag & O_CREAT) != 0 && __va_arg_pack_len () < 1)
 126         {
 127           __openat_missing_mode ();
 128           return __openat_2 (__fd, __path, __oflag);
 129         }
 130       return __openat_alias (__fd, __path, __oflag, __va_arg_pack ());
 131     }
 132
 133   if (__va_arg_pack_len () < 1)
 134     return __openat_2 (__fd, __path, __oflag);
 135
 136   return __openat_alias (__fd, __path, __oflag, __va_arg_pack ());
 137 }
 138
 139
 140 # ifdef __USE_LARGEFILE64
 141 extern int __openat64_2 (int __fd, __const char *__path, int __oflag)
 142      __nonnull ((2));
 143 extern int __REDIRECT (__openat64_alias, (int __fd, __const char *__path,
 144                                           int __oflag, ...), openat64)
 145      __nonnull ((2));
 146 __errordecl (__openat64_too_many_args,
 147              "openat64 can be called either with 3 or 4 arguments, not more");
 148 __errordecl (__openat64_missing_mode,
 149              "openat64 with O_CREAT in third argument needs 4 arguments");
 150
 151 __extern_always_inline int
 152 openat64 (int __fd, __const char *__path, int __oflag, ...)
 153 {
 154   if (__va_arg_pack_len () > 1)
 155     __openat64_too_many_args ();
 156
 157   if (__builtin_constant_p (__oflag))
 158     {
 159       if ((__oflag & O_CREAT) != 0 && __va_arg_pack_len () < 1)
 160         {
 161           __openat64_missing_mode ();
 162           return __openat64_2 (__fd, __path, __oflag);
 163         }
 164       return __openat64_alias (__fd, __path, __oflag, __va_arg_pack ());
 165     }
 166
 167   if (__va_arg_pack_len () < 1)
 168     return __openat64_2 (__fd, __path, __oflag);
 169
 170   return __openat64_alias (__fd, __path, __oflag, __va_arg_pack ());
 171 }
 172 # endif
 173 #endif