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Side by Side Diff: third_party/npapi/npspy/extern/nspr/prlink.h

Issue 665543002: Remove third_party/npapi/npspy. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 6 years, 2 months ago
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /*
3 * The contents of this file are subject to the Mozilla Public
4 * License Version 1.1 (the "License"); you may not use this file
5 * except in compliance with the License. You may obtain a copy of
6 * the License at http://www.mozilla.org/MPL/
7 *
8 * Software distributed under the License is distributed on an "AS
9 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
10 * implied. See the License for the specific language governing
11 * rights and limitations under the License.
12 *
13 * The Original Code is the Netscape Portable Runtime (NSPR).
14 *
15 * The Initial Developer of the Original Code is Netscape
16 * Communications Corporation. Portions created by Netscape are
17 * Copyright (C) 1998-2000 Netscape Communications Corporation. All
18 * Rights Reserved.
19 *
20 * Contributor(s):
21 *
22 * Alternatively, the contents of this file may be used under the
23 * terms of the GNU General Public License Version 2 or later (the
24 * "GPL"), in which case the provisions of the GPL are applicable
25 * instead of those above. If you wish to allow use of your
26 * version of this file only under the terms of the GPL and not to
27 * allow others to use your version of this file under the MPL,
28 * indicate your decision by deleting the provisions above and
29 * replace them with the notice and other provisions required by
30 * the GPL. If you do not delete the provisions above, a recipient
31 * may use your version of this file under either the MPL or the
32 * GPL.
33 */
34
35 #ifndef prlink_h___
36 #define prlink_h___
37
38 /*
39 ** API to static and dynamic linking.
40 */
41 #include "prtypes.h"
42
43 PR_BEGIN_EXTERN_C
44
45 typedef struct PRLibrary PRLibrary;
46
47 typedef struct PRStaticLinkTable {
48 const char *name;
49 void (*fp)();
50 } PRStaticLinkTable;
51
52 /*
53 ** Change the default library path to the given string. The string is
54 ** copied. This call will fail if it runs out of memory.
55 **
56 ** The string provided as 'path' is copied. The caller can do whatever is
57 ** convenient with the argument when the function is complete.
58 */
59 NSPR_API(PRStatus) PR_SetLibraryPath(const char *path);
60
61 /*
62 ** Return a character string which contains the path used to search for
63 ** dynamically loadable libraries.
64 **
65 ** The returned value is basically a copy of a PR_SetLibraryPath().
66 ** The storage is allocated by the runtime and becomes the responsibilty
67 ** of the caller.
68 */
69 NSPR_API(char*) PR_GetLibraryPath(void);
70
71 /*
72 ** Given a directory name "dir" and a library name "lib" construct a full
73 ** path name that will refer to the actual dynamically loaded
74 ** library. This does not test for existance of said file, it just
75 ** constructs the full filename. The name constructed is system dependent
76 ** and prepared for PR_LoadLibrary. The result must be free'd when the
77 ** caller is done with it.
78 **
79 ** The storage for the result is allocated by the runtime and becomes the
80 ** responsibility of the caller.
81 */
82 NSPR_API(char*) PR_GetLibraryName(const char *dir, const char *lib);
83
84 /*
85 **
86 ** Free the memory allocated, for the caller, by PR_GetLibraryName
87 */
88 NSPR_API(void) PR_FreeLibraryName(char *mem);
89
90 /*
91 ** Given a library "name" try to load the library. The argument "name"
92 ** is a machine-dependent name for the library, such as the full pathname
93 ** returned by PR_GetLibraryName. If the library is already loaded,
94 ** this function will avoid loading the library twice.
95 **
96 ** If the library is loaded successfully, then a pointer to the PRLibrary
97 ** structure representing the library is returned. Otherwise, NULL is
98 ** returned.
99 **
100 ** This increments the reference count of the library.
101 */
102 NSPR_API(PRLibrary*) PR_LoadLibrary(const char *name);
103
104 /*
105 ** Each operating system has its preferred way of specifying
106 ** a file in the file system. Most operating systems use
107 ** a pathname. Mac OS, on the other hand, uses the FSSpec
108 ** structure to specify a file. PRLibSpec allows NSPR clients
109 ** to use the type of file specification that is most efficient
110 ** for a particular platform.
111 **
112 ** On some operating systems such as Mac OS, a shared library may
113 ** contain code fragments that can be individually loaded.
114 ** PRLibSpec also allows NSPR clients to identify a code fragment
115 ** in a library, if code fragments are supported by the OS.
116 ** A code fragment can be specified by name or by an integer index.
117 **
118 ** Right now PRLibSpec supports three types of library specification:
119 ** a pathname, a Mac code fragment by name, and a Mac code fragment
120 ** by index.
121 */
122
123 typedef enum PRLibSpecType {
124 PR_LibSpec_Pathname,
125 PR_LibSpec_MacNamedFragment,
126 PR_LibSpec_MacIndexedFragment
127 } PRLibSpecType;
128
129 struct FSSpec; /* Mac OS FSSpec */
130
131 typedef struct PRLibSpec {
132 PRLibSpecType type;
133 union {
134 /* if type is PR_LibSpec_Pathname */
135 const char *pathname;
136
137 /* if type is PR_LibSpec_MacNamedFragment */
138 struct {
139 const struct FSSpec *fsspec;
140 const char *name;
141 } mac_named_fragment;
142
143 /* if type is PR_LibSpec_MacIndexedFragment */
144 struct {
145 const struct FSSpec *fsspec;
146 PRUint32 index;
147 } mac_indexed_fragment;
148 } value;
149 } PRLibSpec;
150
151 /*
152 ** The following bit flags may be or'd together and passed
153 ** as the 'flags' argument to PR_LoadLibraryWithFlags.
154 ** Flags not supported by the underlying OS are ignored.
155 */
156
157 #define PR_LD_LAZY 0x1 /* equivalent to RTLD_LAZY on Unix */
158 #define PR_LD_NOW 0x2 /* equivalent to RTLD_NOW on Unix */
159 #define PR_LD_GLOBAL 0x4 /* equivalent to RTLD_GLOBAL on Unix */
160 #define PR_LD_LOCAL 0x8 /* equivalent to RTLD_LOCAL on Unix */
161
162 /*
163 ** Load the specified library, in the manner specified by 'flags'.
164 */
165
166 NSPR_API(PRLibrary *)
167 PR_LoadLibraryWithFlags(
168 PRLibSpec libSpec, /* the shared library */
169 PRIntn flags /* flags that affect the loading */
170 );
171
172 /*
173 ** Unload a previously loaded library. If the library was a static
174 ** library then the static link table will no longer be referenced. The
175 ** associated PRLibrary object is freed.
176 **
177 ** PR_FAILURE is returned if the library cannot be unloaded.
178 **
179 ** This function decrements the reference count of the library.
180 */
181 NSPR_API(PRStatus) PR_UnloadLibrary(PRLibrary *lib);
182
183 /*
184 ** Given the name of a procedure, return the address of the function that
185 ** implements the procedure, or NULL if no such function can be
186 ** found. This does not find symbols in the main program (the ".exe");
187 ** use PR_LoadStaticLibrary to register symbols in the main program.
188 **
189 ** This function does not modify the reference count of the library.
190 */
191 NSPR_API(void*) PR_FindSymbol(PRLibrary *lib, const char *name);
192
193 /*
194 ** Similar to PR_FindSymbol, except that the return value is a pointer to
195 ** a function, and not a pointer to void. Casting between a data pointer
196 ** and a function pointer is not portable according to the C standard.
197 ** Any function pointer can be cast to any other function pointer.
198 **
199 ** This function does not modify the reference count of the library.
200 */
201 typedef void (*PRFuncPtr)();
202 NSPR_API(PRFuncPtr) PR_FindFunctionSymbol(PRLibrary *lib, const char *name);
203
204 /*
205 ** Finds a symbol in one of the currently loaded libraries. Given the
206 ** name of a procedure, return the address of the function that
207 ** implements the procedure, and return the library that contains that
208 ** symbol, or NULL if no such function can be found. This does not find
209 ** symbols in the main program (the ".exe"); use PR_AddStaticLibrary to
210 ** register symbols in the main program.
211 **
212 ** This increments the reference count of the library.
213 */
214 NSPR_API(void*) PR_FindSymbolAndLibrary(const char *name,
215 PRLibrary* *lib);
216
217 /*
218 ** Similar to PR_FindSymbolAndLibrary, except that the return value is
219 ** a pointer to a function, and not a pointer to void. Casting between a
220 ** data pointer and a function pointer is not portable according to the C
221 ** standard. Any function pointer can be cast to any other function pointer.
222 **
223 ** This increments the reference count of the library.
224 */
225 NSPR_API(PRFuncPtr) PR_FindFunctionSymbolAndLibrary(const char *name,
226 PRLibrary* *lib);
227
228 /*
229 ** Register a static link table with the runtime under the name
230 ** "name". The symbols present in the static link table will be made
231 ** available to PR_FindSymbol. If "name" is null then the symbols will be
232 ** made available to the library which represents the executable. The
233 ** tables are not copied.
234 **
235 ** Returns the library object if successful, null otherwise.
236 **
237 ** This increments the reference count of the library.
238 */
239 NSPR_API(PRLibrary*) PR_LoadStaticLibrary(
240 const char *name, const PRStaticLinkTable *table);
241
242 /*
243 ** Return the pathname of the file that the library "name" was loaded
244 ** from. "addr" is the address of a function defined in the library.
245 **
246 ** The caller is responsible for freeing the result with PR_Free.
247 */
248 NSPR_API(char *) PR_GetLibraryFilePathname(const char *name, PRFuncPtr addr);
249
250 PR_END_EXTERN_C
251
252 #endif /* prlink_h___ */
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