The C and C++ Include Header Files

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


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

     1	/* System dependent definitions for run-time dynamic loading.
     2	   Copyright (C) 1996-2024 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 _DLFCN_H
    20	# error "Never use <bits/dlfcn.h> directly; include <dlfcn.h> instead."
    21	#endif
    22	
    23	/* The MODE argument to `dlopen' contains one of the following: */
    24	#define RTLD_LAZY	0x00001	/* Lazy function call binding.  */
    25	#define RTLD_NOW	0x00002	/* Immediate function call binding.  */
    26	#define	RTLD_BINDING_MASK   0x3	/* Mask of binding time value.  */
    27	#define RTLD_NOLOAD	0x00004	/* Do not load the object.  */
    28	#define RTLD_DEEPBIND	0x00008	/* Use deep binding.  */
    29	
    30	/* If the following bit is set in the MODE argument to `dlopen',
    31	   the symbols of the loaded object and its dependencies are made
    32	   visible as if the object were linked directly into the program.  */
    33	#define RTLD_GLOBAL	0x00100
    34	
    35	/* Unix98 demands the following flag which is the inverse to RTLD_GLOBAL.
    36	   The implementation does this by default and so we can define the
    37	   value to zero.  */
    38	#define RTLD_LOCAL	0
    39	
    40	/* Do not delete object when closed.  */
    41	#define RTLD_NODELETE	0x01000
    42	
    43	#ifdef __USE_GNU
    44	/* To support profiling of shared objects it is a good idea to call
    45	   the function found using `dlsym' using the following macro since
    46	   these calls do not use the PLT.  But this would mean the dynamic
    47	   loader has no chance to find out when the function is called.  The
    48	   macro applies the necessary magic so that profiling is possible.
    49	   Rewrite
    50		foo = (*fctp) (arg1, arg2);
    51	   into
    52	        foo = DL_CALL_FCT (fctp, (arg1, arg2));
    53	*/
    54	# define DL_CALL_FCT(fctp, args) \
    55	  (_dl_mcount_wrapper_check ((void *) (fctp)), (*(fctp)) args)
    56	
    57	__BEGIN_DECLS
    58	
    59	/* This function calls the profiling functions.  */
    60	extern void _dl_mcount_wrapper_check (void *__selfpc) __THROW;
    61	
    62	__END_DECLS
    63	
    64	#endif