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The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/bits/fcntl2.h


$ cat -n /usr/include/x86_64-linux-gnu/bits/fcntl2.h

     1	/* Checking macros for fcntl functions.
     2	   Copyright (C) 2007-2024 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	#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 or O_TMPFILE 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 or O_TMPFILE 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 (__OPEN_NEEDS_MODE (__oflag) && __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 or O_TMPFILE 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 (__OPEN_NEEDS_MODE (__oflag) && __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 or O_TMPFILE 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 (__OPEN_NEEDS_MODE (__oflag) && __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 or O_TMPFILE 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 (__OPEN_NEEDS_MODE (__oflag) && __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