xref: /freebsd-10.1-release/include/dlfcn.h

/*-
 * Copyright (c) 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD: head/include/dlfcn.h 103212 2002-09-11 05:04:06Z mike $
 */

#ifndef _DLFCN_H_
#define	_DLFCN_H_

#include <sys/cdefs.h>

/*
 * Modes and flags for dlopen().
 */
#define	RTLD_LAZY	1	/* Bind function calls lazily. */
#define	RTLD_NOW	2	/* Bind function calls immediately. */
#define	RTLD_MODEMASK	0x3
#define	RTLD_GLOBAL	0x100	/* Make symbols globally available. */
#define	RTLD_LOCAL	0	/* Opposite of RTLD_GLOBAL, and the default. */
#define	RTLD_TRACE	0x200	/* Trace loaded objects and exit. */

/*
 * Special handle arguments for dlsym().
 */
#define	RTLD_NEXT	((void *) -1)	/* Search subsequent objects. */
#define	RTLD_DEFAULT	((void *) -2)	/* Use default search algorithm. */

#if __BSD_VISIBLE
/*
 * Structure filled in by dladdr().
 */
typedef	struct dl_info {
	const char	*dli_fname;	/* Pathname of shared object. */
	void		*dli_fbase;	/* Base address of shared object. */
	const char	*dli_sname;	/* Name of nearest symbol. */
	void		*dli_saddr;	/* Address of nearest symbol. */
} Dl_info;

/*-
 * The actual type declared by this typedef is immaterial, provided that
 * it is a function pointer.  Its purpose is to provide a return type for
 * dlfunc() which can be cast to a function pointer type without depending
 * on behavior undefined by the C standard, which might trigger a compiler
 * diagnostic.  We intentionally declare a unique type signature to force
 * a diagnostic should the application not cast the return value of dlfunc()
 * appropriately.
 */
struct __dlfunc_arg {
	int	__dlfunc_dummy;
};

typedef	void (*dlfunc_t)(struct __dlfunc_arg);

#endif /* __BSD_VISIBLE */

__BEGIN_DECLS
/* XSI functions first. */
int	 dlclose(void *);
const char *
	 dlerror(void);
void	*dlopen(const char *, int);
void	*dlsym(void * __restrict, const char * __restrict);

#if __BSD_VISIBLE
int	 dladdr(const void *, Dl_info *);
dlfunc_t dlfunc(void * __restrict, const char * __restrict);
void	 dllockinit(void *_context,
	    void *(*_lock_create)(void *_context),
	    void (*_rlock_acquire)(void *_lock),
	    void (*_wlock_acquire)(void *_lock),
	    void (*_lock_release)(void *_lock),
	    void (*_lock_destroy)(void *_lock),
	    void (*_context_destroy)(void *_context));
#endif /* __BSD_VISIBLE */
__END_DECLS

#endif /* !_DLFCN_H_ */