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git://sourceware.org/git/glibc.git
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82eef55f8f
This commit adds a new _dl_open_hook entry for dlvsym and implements the function using the existing dl_lookup_symbol_x function supplied by the dynamic loader. A new hook variable, _dl_open_hook2, is introduced, which should make this change suitable for backporting: For old statically linked binaries, __libc_dlvsym will always return NULL.
140 lines
4.7 KiB
C
140 lines
4.7 KiB
C
#ifndef _DLFCN_H
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#include <dlfcn/dlfcn.h>
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#ifndef _ISOMAC
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#include <link.h> /* For ElfW. */
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#include <stdbool.h>
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/* Internally used flag. */
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#define __RTLD_DLOPEN 0x80000000
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#define __RTLD_SPROF 0x40000000
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#define __RTLD_OPENEXEC 0x20000000
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#define __RTLD_CALLMAP 0x10000000
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#define __RTLD_AUDIT 0x08000000
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#define __RTLD_SECURE 0x04000000 /* Apply additional security checks. */
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#define __RTLD_NOIFUNC 0x02000000 /* Suppress calling ifunc functions. */
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#define __LM_ID_CALLER -2
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#ifdef SHARED
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/* Locally stored program arguments. */
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extern int __dlfcn_argc attribute_hidden;
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extern char **__dlfcn_argv attribute_hidden;
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#else
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/* These variables are defined and initialized in the startup code. */
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extern int __libc_argc attribute_hidden;
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extern char **__libc_argv attribute_hidden;
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# define __dlfcn_argc __libc_argc
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# define __dlfcn_argv __libc_argv
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#endif
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/* Now define the internal interfaces. */
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#define __libc_dlopen(name) \
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__libc_dlopen_mode (name, RTLD_LAZY | __RTLD_DLOPEN)
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extern void *__libc_dlopen_mode (const char *__name, int __mode);
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extern void *__libc_dlsym (void *__map, const char *__name);
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extern void *__libc_dlvsym (void *map, const char *name, const char *version);
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extern int __libc_dlclose (void *__map);
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libc_hidden_proto (__libc_dlopen_mode)
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libc_hidden_proto (__libc_dlsym)
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libc_hidden_proto (__libc_dlvsym)
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libc_hidden_proto (__libc_dlclose)
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/* Locate shared object containing the given address. */
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#ifdef ElfW
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extern int _dl_addr (const void *address, Dl_info *info,
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struct link_map **mapp, const ElfW(Sym) **symbolp);
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libc_hidden_proto (_dl_addr)
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#endif
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struct link_map;
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/* Close an object previously opened by _dl_open. */
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extern void _dl_close (void *map) attribute_hidden;
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/* Same as above, but without locking and safety checks for user
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provided map arguments. */
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extern void _dl_close_worker (struct link_map *map, bool force)
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attribute_hidden;
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/* Look up NAME in shared object HANDLE (which may be RTLD_DEFAULT or
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RTLD_NEXT). WHO is the calling function, for RTLD_NEXT. Returns
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the symbol value, which may be NULL. */
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extern void *_dl_sym (void *handle, const char *name, void *who);
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/* Look up version VERSION of symbol NAME in shared object HANDLE
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(which may be RTLD_DEFAULT or RTLD_NEXT). WHO is the calling
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function, for RTLD_NEXT. Returns the symbol value, which may be
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NULL. */
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extern void *_dl_vsym (void *handle, const char *name, const char *version,
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void *who);
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/* Helper function for <dlfcn.h> functions. Runs the OPERATE function via
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_dl_catch_error. Returns zero for success, nonzero for failure; and
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arranges for `dlerror' to return the error details.
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ARGS is passed as argument to OPERATE. */
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extern int _dlerror_run (void (*operate) (void *), void *args)
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attribute_hidden;
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#ifdef SHARED
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# define DL_CALLER_DECL /* Nothing */
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# define DL_CALLER RETURN_ADDRESS (0)
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#else
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# define DL_CALLER_DECL , void *dl_caller
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# define DL_CALLER dl_caller
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#endif
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struct dlfcn_hook
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{
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void *(*dlopen) (const char *file, int mode, void *dl_caller);
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int (*dlclose) (void *handle);
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void *(*dlsym) (void *handle, const char *name, void *dl_caller);
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void *(*dlvsym) (void *handle, const char *name, const char *version,
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void *dl_caller);
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char *(*dlerror) (void);
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int (*dladdr) (const void *address, Dl_info *info);
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int (*dladdr1) (const void *address, Dl_info *info,
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void **extra_info, int flags);
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int (*dlinfo) (void *handle, int request, void *arg, void *dl_caller);
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void *(*dlmopen) (Lmid_t nsid, const char *file, int mode, void *dl_caller);
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void *pad[4];
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};
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extern struct dlfcn_hook *_dlfcn_hook;
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libdl_hidden_proto (_dlfcn_hook)
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extern void *__dlopen (const char *file, int mode DL_CALLER_DECL)
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attribute_hidden;
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extern void *__dlmopen (Lmid_t nsid, const char *file, int mode DL_CALLER_DECL)
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attribute_hidden;
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extern int __dlclose (void *handle)
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attribute_hidden;
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extern void *__dlsym (void *handle, const char *name DL_CALLER_DECL)
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attribute_hidden;
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extern void *__dlvsym (void *handle, const char *name, const char *version
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DL_CALLER_DECL)
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attribute_hidden;
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extern char *__dlerror (void)
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attribute_hidden;
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extern int __dladdr (const void *address, Dl_info *info)
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attribute_hidden;
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extern int __dladdr1 (const void *address, Dl_info *info,
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void **extra_info, int flags)
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attribute_hidden;
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extern int __dlinfo (void *handle, int request, void *arg DL_CALLER_DECL)
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attribute_hidden;
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#ifndef SHARED
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struct link_map;
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extern void * __libc_dlsym_private (struct link_map *map, const char *name)
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attribute_hidden;
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extern void __libc_register_dl_open_hook (struct link_map *map)
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attribute_hidden;
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extern void __libc_register_dlfcn_hook (struct link_map *map)
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attribute_hidden;
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#endif
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#endif
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#endif
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