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authorUlrich Drepper <drepper@redhat.com>1999-07-07 18:39:33 +0000
committerUlrich Drepper <drepper@redhat.com>1999-07-07 18:39:33 +0000
commit94e365c61202e2472c8aea42c7c95ce40f5b843c (patch)
tree15cf6a02604ab91d5aa1feeaeb338f0fc6b91f34 /dlfcn/dlfcn.h
parent2556bfe6fdb5ccb4864e0249d5fdd475e4100c71 (diff)
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Update.
* sysdeps/gnu/Makefile (libdl-routines): Add eval. 1999-07-06 Zack Weinberg <zack@rabi.columbia.edu> * dlfcn: New directory. Move the following files from elf: dladdr.c, dlclose.c, dlerror.c, dlfcn.h, dlopen.c, dlopenold.c, dlsym.c, dlvsym.c. * dlfcn/Makefile: New file. * dlfcn/Versions: New file. * dlfcn/dlsym.c: All ELF-specific code split out to new function _dl_sym. * dlfcn/dlvsym.c: All ELF-specific code split out to new function _dl_vsym. * elf/dl-sym.c: New file. _dl_sym and _dl_vsym are implemented here. * dlfcn/dladdr.c: Remove all references to ELF data structures or headers. * dlfcn/dlclose.c: Likewise. * dlfcn/dlerror.c: Likewise. * dlfcn/dlopen.c: Likewise. * dlfcn/dlopenold.c: Likewise. * Makeconfig (dlfcn): New variable - set to `dlfcn' if elf is yes, empty otherwise. (libdl): Set to dlfcn/libdl.so or libdl.a if elf is yes, depending on build-shared. (subdirs): Add $(dlfcn). (rpath-dirs): Add dlfcn. * elf/Makefile: Remove all references to libdl or its components, except the ones relating to the test cases. (routines): Add dl-sym. * elf/Versions (libc): Add _dl_sym and _dl_vsym for GLIBC_2.2. (libdl): Delete. * elf/dl-close.c (_dl_close): Change argument to void *. * elf/dl-open.c (_dl_open): Change return type to void *. * elf/eval.c: Removed. * elf/ldsodefs.h: Move prototypes of _dl_catch_error, _dlerror_run, _dl_open, _dl_close, _dl_addr, and _dl_mcount_wrapper_check to include/dlfcn.h. Delete _CALL_DL_FCT macro. * include/dlfcn.h: Also prototype _dl_sym and _dl_vsym here. Include real header from dlfcn directory. * include/ldsodefs.h: Removed. * grp/initgroups.c: Use DL_CALL_FCT not _CALL_DL_FCT. * nss/getXXbyYY_r.c: Likewise. * nss/getXXent_r.c: Likewise. * iconv/gconv.c: Likewise. Don't include ldsodefs.h. * iconv/gconv_db.c: Likewise. Don't include ldsodefs.h. * iconv/skeleton.c: Don't include ldsodefs.h. * nss/nsswitch.h: Don't include ldsodefs.h. Include dlfcn.h. 1999-07-07 Ulrich Drepper <drepper@cygnus.com>
Diffstat (limited to 'dlfcn/dlfcn.h')
-rw-r--r--dlfcn/dlfcn.h100
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diff --git a/dlfcn/dlfcn.h b/dlfcn/dlfcn.h
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+/* User functions for run-time dynamic loading.
+ Copyright (C) 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#ifndef _DLFCN_H
+#define _DLFCN_H 1
+
+#include <features.h>
+#define __need_NULL
+#include <stddef.h>
+
+/* Collect various system dependent definitions and declarations. */
+#include <bits/dlfcn.h>
+
+/* If the first argument of `dlsym' or `dlvsym' is set to RTLD_NEXT
+ the run-time address of the symbol called NAME in the next shared
+ object is returned. The "next" relation is defined by the order
+ the shared objects were loaded. */
+#define RTLD_NEXT ((void *) -1l)
+
+/* If the first argument to `dlsym' or `dlvsym' is set to RTLD_DEFAULT
+ the run-time address of the symbol called NAME in the global scope
+ is returned. */
+#define RTLD_DEFAULT NULL
+
+__BEGIN_DECLS
+
+/* Open the shared object FILE and map it in; return a handle that can be
+ passed to `dlsym' to get symbol values from it. */
+extern void *dlopen __P ((__const char *__file, int __mode));
+
+/* Unmap and close a shared object opened by `dlopen'.
+ The handle cannot be used again after calling `dlclose'. */
+extern int dlclose __P ((void *__handle));
+
+/* Find the run-time address in the shared object HANDLE refers to
+ of the symbol called NAME. */
+extern void *dlsym __P ((void *__restrict __handle,
+ __const char *__restrict __name));
+
+#ifdef __USE_GNU
+/* Find the run-time address in the shared object HANDLE refers to
+ of the symbol called NAME with VERSION. */
+extern void *dlvsym __P ((void *__restrict __handle,
+ __const char *__restrict __name,
+ __const char *__restrict __version));
+#endif
+
+/* When any of the above functions fails, call this function
+ to return a string describing the error. Each call resets
+ the error string so that a following call returns null. */
+extern char *dlerror __P ((void));
+
+#ifdef __USE_GNU
+/* Fill in *INFO with the following information about ADDRESS.
+ Returns 0 iff no shared object's segments contain that address. */
+typedef struct
+ {
+ __const char *dli_fname; /* File name of defining object. */
+ void *dli_fbase; /* Load address of that object. */
+ __const char *dli_sname; /* Name of nearest symbol. */
+ void *dli_saddr; /* Exact value of nearest symbol. */
+ } Dl_info;
+extern int dladdr __P ((const void *__address, Dl_info *__info));
+
+/* To support profiling of shared objects it is a good idea to call
+ the function found using `dlsym' using the following macro since
+ these calls do not use the PLT. But this would mean the dynamic
+ loader has no chance to find out when the function is called. The
+ macro applies the necessary magic so that profiling is possible.
+ Rewrite
+ foo = (*fctp) (arg1, arg2);
+ into
+ foo = DL_CALL_FCT (fctp, (arg1, arg2));
+*/
+# define DL_CALL_FCT(fctp, args) \
+ (_dl_mcount_wrapper_check (fctp), (*(fctp)) args)
+
+/* This function calls the profiling functions. */
+extern void _dl_mcount_wrapper_check __P ((void *__selfpc));
+#endif
+
+__END_DECLS
+
+#endif /* dlfcn.h */