1 | /* User functions for run-time dynamic loading. |
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2 | Copyright (C) 1995-1999, 2000, 2001 Free Software Foundation, Inc. |
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3 | This file is part of the GNU C Library. |
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4 | |
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5 | The GNU C Library is free software; you can redistribute it and/or |
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6 | modify it under the terms of the GNU Lesser General Public |
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7 | License as published by the Free Software Foundation; either |
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8 | version 2.1 of the License, or (at your option) any later version. |
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9 | |
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10 | The GNU C Library is distributed in the hope that it will be useful, |
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 | Lesser General Public License for more details. |
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14 | |
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15 | You should have received a copy of the GNU Lesser General Public |
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16 | License along with the GNU C Library; if not, write to the Free |
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17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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18 | 02111-1307 USA. */ |
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19 | |
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20 | #ifndef _DLFCN_H |
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21 | #define _DLFCN_H 1 |
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22 | |
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23 | #include <features.h> |
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24 | |
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25 | /* Collect various system dependent definitions and declarations. */ |
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26 | #include <sys/dlfcn.h> |
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27 | |
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28 | |
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29 | /* If the first argument of `dlsym' or `dlvsym' is set to RTLD_NEXT |
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30 | the run-time address of the symbol called NAME in the next shared |
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31 | object is returned. The "next" relation is defined by the order |
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32 | the shared objects were loaded. */ |
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33 | # define RTLD_NEXT ((void *) -1l) |
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34 | |
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35 | /* If the first argument to `dlsym' or `dlvsym' is set to RTLD_DEFAULT |
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36 | the run-time address of the symbol called NAME in the global scope |
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37 | is returned. */ |
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38 | # define RTLD_DEFAULT ((void *) 0) |
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39 | |
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40 | |
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41 | __BEGIN_DECLS |
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42 | |
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43 | /* Open the shared object FILE and map it in; return a handle that can be |
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44 | passed to `dlsym' to get symbol values from it. */ |
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45 | extern void *dlopen (__const char *__file, int __mode) __THROW; |
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46 | |
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47 | /* Unmap and close a shared object opened by `dlopen'. |
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48 | The handle cannot be used again after calling `dlclose'. */ |
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49 | extern int dlclose (void *__handle) __THROW; |
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50 | |
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51 | /* Find the run-time address in the shared object HANDLE refers to |
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52 | of the symbol called NAME. */ |
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53 | extern void *dlsym (void *__restrict __handle, |
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54 | __const char *__restrict __name) __THROW; |
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55 | |
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56 | /* Find the run-time address in the shared object HANDLE refers to |
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57 | of the symbol called NAME with VERSION. */ |
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58 | extern void *dlvsym (void *__restrict __handle, |
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59 | __const char *__restrict __name, |
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60 | __const char *__restrict __version) __THROW; |
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61 | |
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62 | /* When any of the above functions fails, call this function |
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63 | to return a string describing the error. Each call resets |
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64 | the error string so that a following call returns null. */ |
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65 | extern char *dlerror (void) __THROW; |
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66 | |
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67 | |
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68 | /* Structure containing information about object searched using |
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69 | `dladdr'. */ |
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70 | typedef struct |
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71 | { |
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72 | __const char *dli_fname; /* File name of defining object. */ |
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73 | void *dli_fbase; /* Load address of that object. */ |
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74 | __const char *dli_sname; /* Name of nearest symbol. */ |
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75 | void *dli_saddr; /* Exact value of nearest symbol. */ |
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76 | } Dl_info; |
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77 | |
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78 | /* Fill in *INFO with the following information about ADDRESS. |
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79 | Returns 0 iff no shared object's segments contain that address. */ |
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80 | extern int dladdr (__const void *__address, Dl_info *__info) __THROW; |
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81 | |
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82 | __END_DECLS |
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83 | |
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84 | #endif /* dlfcn.h */ |
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