include/dlfcn.h

   1 /*-
   2  * Copyright (c) 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD$
  30  */
  31
  32 #ifndef _DLFCN_H_
  33 #define _DLFCN_H_
  34
  35 #include <sys/_types.h>
  36
  37 /*
  38  * Modes and flags for dlopen().
  39  */
  40 #define RTLD_LAZY       1       /* Bind function calls lazily. */
  41 #define RTLD_NOW        2       /* Bind function calls immediately. */
  42 #define RTLD_MODEMASK   0x3
  43 #define RTLD_GLOBAL     0x100   /* Make symbols globally available. */
  44 #define RTLD_LOCAL      0       /* Opposite of RTLD_GLOBAL, and the default. */
  45 #define RTLD_TRACE      0x200   /* Trace loaded objects and exit. */
  46 #define RTLD_NODELETE   0x01000 /* Do not remove members. */
  47 #define RTLD_NOLOAD     0x02000 /* Do not load if not already loaded. */
  48
  49 /*
  50  * Request arguments for dlinfo().
  51  */
  52 #define RTLD_DI_LINKMAP         2       /* Obtain link map. */
  53 #define RTLD_DI_SERINFO         4       /* Obtain search path info. */
  54 #define RTLD_DI_SERINFOSIZE     5       /*  ... query for required space. */
  55 #define RTLD_DI_ORIGIN          6       /* Obtain object origin */
  56 #define RTLD_DI_MAX             RTLD_DI_ORIGIN
  57
  58 /*
  59  * Special handle arguments for dlsym()/dlinfo().
  60  */
  61 #define RTLD_NEXT       ((void *) -1)   /* Search subsequent objects. */
  62 #define RTLD_DEFAULT    ((void *) -2)   /* Use default search algorithm. */
  63 #define RTLD_SELF       ((void *) -3)   /* Search the caller itself. */
  64
  65 #if __BSD_VISIBLE
  66
  67 #ifndef _SIZE_T_DECLARED
  68 typedef __size_t        size_t;
  69 #define _SIZE_T_DECLARED
  70 #endif
  71
  72 /*
  73  * Structure filled in by dladdr().
  74  */
  75 typedef struct dl_info {
  76         const char      *dli_fname;     /* Pathname of shared object. */
  77         void            *dli_fbase;     /* Base address of shared object. */
  78         const char      *dli_sname;     /* Name of nearest symbol. */
  79         void            *dli_saddr;     /* Address of nearest symbol. */
  80 } Dl_info;
  81
  82 /*-
  83  * The actual type declared by this typedef is immaterial, provided that
  84  * it is a function pointer.  Its purpose is to provide a return type for
  85  * dlfunc() which can be cast to a function pointer type without depending
  86  * on behavior undefined by the C standard, which might trigger a compiler
  87  * diagnostic.  We intentionally declare a unique type signature to force
  88  * a diagnostic should the application not cast the return value of dlfunc()
  89  * appropriately.
  90  */
  91 struct __dlfunc_arg {
  92         int     __dlfunc_dummy;
  93 };
  94
  95 typedef void (*dlfunc_t)(struct __dlfunc_arg);
  96
  97 /*
  98  * Structures, returned by the RTLD_DI_SERINFO dlinfo() request.
  99  */
 100 typedef struct dl_serpath {
 101         char *          dls_name;       /* single search path entry */
 102         unsigned int    dls_flags;      /* path information */
 103 } Dl_serpath;
 104
 105 typedef struct  dl_serinfo {
 106         size_t          dls_size;       /* total buffer size */
 107         unsigned int    dls_cnt;        /* number of path entries */
 108         Dl_serpath      dls_serpath[1]; /* there may be more than one */
 109 } Dl_serinfo;
 110
 111 #endif /* __BSD_VISIBLE */
 112
 113 __BEGIN_DECLS
 114 /* XSI functions first. */
 115 int      dlclose(void *);
 116 char    *dlerror(void);
 117 void    *dlopen(const char *, int);
 118 void    *dlsym(void * __restrict, const char * __restrict);
 119
 120 #if __BSD_VISIBLE
 121 void    *fdlopen(int, int);
 122 int      dladdr(const void * __restrict, Dl_info * __restrict);
 123 dlfunc_t dlfunc(void * __restrict, const char * __restrict);
 124 int      dlinfo(void * __restrict, int, void * __restrict);
 125 void     dllockinit(void *_context,
 126             void *(*_lock_create)(void *_context),
 127             void (*_rlock_acquire)(void *_lock),
 128             void (*_wlock_acquire)(void *_lock),
 129             void (*_lock_release)(void *_lock),
 130             void (*_lock_destroy)(void *_lock),
 131             void (*_context_destroy)(void *_context));
 132 void    *dlvsym(void * __restrict, const char * __restrict,
 133             const char * __restrict);
 134 #endif /* __BSD_VISIBLE */
 135 __END_DECLS
 136
 137 #endif /* !_DLFCN_H_ */