0c85bd054e
the per-root-image breadth-first sorted image array. Instead we have a
per-image hook function to resolve the symbols. The default function
uses the sLoadedImages list directly, which is breadth-first sorted
anyway. There's also a BeOS function for old-style symbol resolution
and one for add-ons, which lacks a proper implementation yet (just
uses old-style ATM).
* Made the dl*() functions POSIX compliant:
- dlopen() does no longer use load_add_on(), but loads the object as a
library. It also properly supports a NULL name, now -- the previous
"_APP_" work-around did only work, if this soname was set on the
program (unlikely for programs using this API).
- Implemented RTLD_{GLOBAL,LOCAL}.
- dlsym() looks up symbols properly now, i.e. not just in the given
image, but breadth-first for an actual image or in load order for
the global scope. It also supports the not-quite POSIX RTLD_DEFAULT
and RTLD_NEXT extensions. Our RTLD_NEXT finds more symbols than in
Linux (also in later dlopen()ed libraries), but that should be fine.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28568 a95241bf-73f2-0310-859d-f6bbb57e9c96
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
/*
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* Copyright 2003-2008, Haiku Inc. All Rights Reserved.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _DLFCN_H
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#define _DLFCN_H
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#include <sys/types.h>
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#define RTLD_LAZY 0 /* relocations are performed as needed */
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#define RTLD_NOW 1 /* the file gets relocated at load time */
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#define RTLD_LOCAL 0 /* symbols are not available for relocating any other object */
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#define RTLD_GLOBAL 2 /* all symbols are available */
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/* not-yet-POSIX extensions (dlsym() handles) */
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#define RTLD_DEFAULT ((void*)0)
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/* find the symbol in the global scope */
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#define RTLD_NEXT ((void*)-1L)
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/* find the next definition of the symbol */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* This is a gnu extension for the dladdr function */
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typedef struct {
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const char *dli_fname; /* Filename of defining object */
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void *dli_fbase; /* Load address of that object */
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const char *dli_sname; /* Name of nearest lower symbol */
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void *dli_saddr; /* Exact value of nearest symbol */
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} Dl_info;
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extern int dlclose(void *image);
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extern char *dlerror(void);
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extern void *dlopen(const char *path, int mode);
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extern void *dlsym(void *image, const char *symbolName);
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extern int dladdr(void *addr, Dl_info *info);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _DLFCN_H */
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