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comparison nspr/pr/include/prlink.h @ 0:1e5118fa0cb1

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This is NSS with a Cmake Buildsyste To compile a static NSS library for Windows we've used the Chromium-NSS fork and added a Cmake buildsystem to compile it statically for Windows. See README.chromium for chromium changes and README.trustbridge for our modifications.
author Andre Heinecke <andre.heinecke@intevation.de>
date Mon, 28 Jul 2014 10:47:06 +0200
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 #ifndef prlink_h___
7 #define prlink_h___
8
9 /*
10 ** API to static and dynamic linking.
11 */
12 #include "prtypes.h"
13
14 PR_BEGIN_EXTERN_C
15
16 typedef struct PRLibrary PRLibrary;
17
18 typedef struct PRStaticLinkTable {
19 const char *name;
20 void (*fp)(void);
21 } PRStaticLinkTable;
22
23 /*
24 ** Change the default library path to the given string. The string is
25 ** copied. This call will fail if it runs out of memory.
26 **
27 ** The string provided as 'path' is copied. The caller can do whatever is
28 ** convenient with the argument when the function is complete.
29 */
30 NSPR_API(PRStatus) PR_SetLibraryPath(const char *path);
31
32 /*
33 ** Return a character string which contains the path used to search for
34 ** dynamically loadable libraries.
35 **
36 ** The returned value is basically a copy of a PR_SetLibraryPath().
37 ** The storage is allocated by the runtime and becomes the responsibilty
38 ** of the caller.
39 */
40 NSPR_API(char*) PR_GetLibraryPath(void);
41
42 /*
43 ** Given a directory name "dir" and a library name "lib" construct a full
44 ** path name that will refer to the actual dynamically loaded
45 ** library. This does not test for existance of said file, it just
46 ** constructs the full filename. The name constructed is system dependent
47 ** and prepared for PR_LoadLibrary. The result must be free'd when the
48 ** caller is done with it.
49 **
50 ** The storage for the result is allocated by the runtime and becomes the
51 ** responsibility of the caller.
52 */
53 NSPR_API(char*) PR_GetLibraryName(const char *dir, const char *lib);
54
55 /*
56 **
57 ** Free the memory allocated, for the caller, by PR_GetLibraryName
58 */
59 NSPR_API(void) PR_FreeLibraryName(char *mem);
60
61 /*
62 ** Given a library "name" try to load the library. The argument "name"
63 ** is a machine-dependent name for the library, such as the full pathname
64 ** returned by PR_GetLibraryName. If the library is already loaded,
65 ** this function will avoid loading the library twice.
66 **
67 ** If the library is loaded successfully, then a pointer to the PRLibrary
68 ** structure representing the library is returned. Otherwise, NULL is
69 ** returned.
70 **
71 ** This increments the reference count of the library.
72 */
73 NSPR_API(PRLibrary*) PR_LoadLibrary(const char *name);
74
75 /*
76 ** Each operating system has its preferred way of specifying
77 ** a file in the file system. Most operating systems use
78 ** a pathname. Mac OS Classic, on the other hand, uses the FSSpec
79 ** structure to specify a file. PRLibSpec allows NSPR clients
80 ** to use the type of file specification that is most efficient
81 ** for a particular platform.
82 **
83 ** On some operating systems such as Mac OS Classic, a shared library
84 ** may contain code fragments that can be individually loaded.
85 ** PRLibSpec also allows NSPR clients to identify a code fragment
86 ** in a library, if code fragments are supported by the OS.
87 ** A code fragment can be specified by name or by an integer index.
88 **
89 ** Right now PRLibSpec supports four types of library specification:
90 ** a pathname in the native character encoding, a Mac code fragment
91 ** by name, a Mac code fragment by index, and a UTF-16 pathname.
92 */
93
94 typedef enum PRLibSpecType {
95 PR_LibSpec_Pathname,
96 PR_LibSpec_MacNamedFragment, /* obsolete (for Mac OS Classic) */
97 PR_LibSpec_MacIndexedFragment, /* obsolete (for Mac OS Classic) */
98 PR_LibSpec_PathnameU /* supported only on Win32 */
99 } PRLibSpecType;
100
101 struct FSSpec; /* Mac OS Classic FSSpec */
102
103 typedef struct PRLibSpec {
104 PRLibSpecType type;
105 union {
106 /* if type is PR_LibSpec_Pathname */
107 const char *pathname;
108
109 /* if type is PR_LibSpec_MacNamedFragment */
110 struct {
111 const struct FSSpec *fsspec;
112 const char *name;
113 } mac_named_fragment; /* obsolete (for Mac OS Classic) */
114
115 /* if type is PR_LibSpec_MacIndexedFragment */
116 struct {
117 const struct FSSpec *fsspec;
118 PRUint32 index;
119 } mac_indexed_fragment; /* obsolete (for Mac OS Classic) */
120
121 /* if type is PR_LibSpec_PathnameU */
122 const PRUnichar *pathname_u; /* supported only on Win32 */
123 } value;
124 } PRLibSpec;
125
126 /*
127 ** The following bit flags may be or'd together and passed
128 ** as the 'flags' argument to PR_LoadLibraryWithFlags.
129 ** Flags not supported by the underlying OS are ignored.
130 */
131
132 #define PR_LD_LAZY 0x1 /* equivalent to RTLD_LAZY on Unix */
133 #define PR_LD_NOW 0x2 /* equivalent to RTLD_NOW on Unix */
134 #define PR_LD_GLOBAL 0x4 /* equivalent to RTLD_GLOBAL on Unix */
135 #define PR_LD_LOCAL 0x8 /* equivalent to RTLD_LOCAL on Unix */
136 /* The following is equivalent to LOAD_WITH_ALTERED_SEARCH_PATH on Windows */
137 #define PR_LD_ALT_SEARCH_PATH 0x10
138 /* 0x8000 reserved for NSPR internal use */
139
140 /*
141 ** Load the specified library, in the manner specified by 'flags'.
142 */
143
144 NSPR_API(PRLibrary *)
145 PR_LoadLibraryWithFlags(
146 PRLibSpec libSpec, /* the shared library */
147 PRIntn flags /* flags that affect the loading */
148 );
149
150 /*
151 ** Unload a previously loaded library. If the library was a static
152 ** library then the static link table will no longer be referenced. The
153 ** associated PRLibrary object is freed.
154 **
155 ** PR_FAILURE is returned if the library cannot be unloaded.
156 **
157 ** This function decrements the reference count of the library.
158 */
159 NSPR_API(PRStatus) PR_UnloadLibrary(PRLibrary *lib);
160
161 /*
162 ** Given the name of a procedure, return the address of the function that
163 ** implements the procedure, or NULL if no such function can be
164 ** found. This does not find symbols in the main program (the ".exe");
165 ** use PR_LoadStaticLibrary to register symbols in the main program.
166 **
167 ** This function does not modify the reference count of the library.
168 */
169 NSPR_API(void*) PR_FindSymbol(PRLibrary *lib, const char *name);
170
171 /*
172 ** Similar to PR_FindSymbol, except that the return value is a pointer to
173 ** a function, and not a pointer to void. Casting between a data pointer
174 ** and a function pointer is not portable according to the C standard.
175 ** Any function pointer can be cast to any other function pointer.
176 **
177 ** This function does not modify the reference count of the library.
178 */
179 typedef void (*PRFuncPtr)(void);
180 NSPR_API(PRFuncPtr) PR_FindFunctionSymbol(PRLibrary *lib, const char *name);
181
182 /*
183 ** Finds a symbol in one of the currently loaded libraries. Given the
184 ** name of a procedure, return the address of the function that
185 ** implements the procedure, and return the library that contains that
186 ** symbol, or NULL if no such function can be found. This does not find
187 ** symbols in the main program (the ".exe"); use PR_AddStaticLibrary to
188 ** register symbols in the main program.
189 **
190 ** This increments the reference count of the library.
191 */
192 NSPR_API(void*) PR_FindSymbolAndLibrary(const char *name,
193 PRLibrary* *lib);
194
195 /*
196 ** Similar to PR_FindSymbolAndLibrary, except that the return value is
197 ** a pointer to a function, and not a pointer to void. Casting between a
198 ** data pointer and a function pointer is not portable according to the C
199 ** standard. Any function pointer can be cast to any other function pointer.
200 **
201 ** This increments the reference count of the library.
202 */
203 NSPR_API(PRFuncPtr) PR_FindFunctionSymbolAndLibrary(const char *name,
204 PRLibrary* *lib);
205
206 /*
207 ** Register a static link table with the runtime under the name
208 ** "name". The symbols present in the static link table will be made
209 ** available to PR_FindSymbol. If "name" is null then the symbols will be
210 ** made available to the library which represents the executable. The
211 ** tables are not copied.
212 **
213 ** Returns the library object if successful, null otherwise.
214 **
215 ** This increments the reference count of the library.
216 */
217 NSPR_API(PRLibrary*) PR_LoadStaticLibrary(
218 const char *name, const PRStaticLinkTable *table);
219
220 /*
221 ** Return the pathname of the file that the library "name" was loaded
222 ** from. "addr" is the address of a function defined in the library.
223 **
224 ** The caller is responsible for freeing the result with PR_Free.
225 */
226 NSPR_API(char *) PR_GetLibraryFilePathname(const char *name, PRFuncPtr addr);
227
228 PR_END_EXTERN_C
229
230 #endif /* prlink_h___ */
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