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authorUlrich Drepper <drepper@redhat.com>1999-06-28 15:52:36 +0000
committerUlrich Drepper <drepper@redhat.com>1999-06-28 15:52:36 +0000
commitb3fc5f84d13573b9494fb1f0db9b5e80679e5098 (patch)
treedc0a71f8e940437cbc744a1b2fb9e8a01913a5a8 /elf/dl-libc.c
parent738d1a5a43e97ee81d7b62a3c7a5f754f5b51b82 (diff)
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Update.
* sysdeps/libm-ieee754/e_gamma_r.c: Initialize *signgamp for NaN returns. * sysdeps/libm-ieee754/e_gammaf_r.c: Likewise. * sysdeps/libm-ieee754/e_gammal_r.c: Likewise. Reported by John Reiser <jreiser@BitWagon.com> [PR libc/1185]. * elf/dl-dst.h: Fix typo. * elf/dl-open.c: Likewise. 1999-06-26 Zack Weinberg <zack@rabi.columbia.edu> * elf/dl-libc.c: New file, provides three functions: __libc_dlopen, __libc_dlclose, __libc_dlsym. * include/dlfcn.h: Prototype them. Prototype _dl_addr. * elf/Makefile (routines): Add dl-libc.c. * elf/dl-profstub.c (_dl_mcount_wrapper): Change type of argument to void *. * elf/ldsodefs.h: Change proto and use of _dl_mcount_wrapper to match. * iconv/gconv.c: Include dlfcn.h. * iconv/gconv_db.c: Likewise. * malloc/mtrace.c: Likewise. Don't include ldsodefs.h. * iconv/gconv_int.h (struct __gconv_loaded_object): Change `handle' to a void *. (__gconv_find_func): Delete prototype. * iconv/gconv_dl.c: Don't include ldsodefs.h. Remove dlerror_run and related functions and structs. Use __libc_dlopen, __libc_dlsym, __libc_dlclose. * nss/nsswitch.c: Likewise. 1999-06-28 Ulrich Drepper <drepper@cygnus.com>
Diffstat (limited to 'elf/dl-libc.c')
-rw-r--r--elf/dl-libc.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/elf/dl-libc.c b/elf/dl-libc.c
new file mode 100644
index 0000000000..afb3f2d14e
--- /dev/null
+++ b/elf/dl-libc.c
@@ -0,0 +1,122 @@
+/* Handle loading and unloading shared objects for internal libc purposes.
+ Copyright (C) 1999 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Zack Weinberg <zack@rabi.columbia.edu>, 1999.
+
+ 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. */
+
+#include <dlfcn.h>
+#include <stdlib.h>
+#include <ldsodefs.h>
+
+/* The purpose of this file is to provide wrappers around the dynamic
+ linker error mechanism (similar to dlopen() et al in libdl) which
+ are usable from within libc. Generally we want to throw away the
+ string that dlerror() would return and just pass back a null pointer
+ for errors. This also lets the rest of libc not know about the error
+ handling mechanism.
+
+ Much of this code came from gconv_dl.c with slight modifications. */
+
+static int
+internal_function
+dlerror_run (void (*operate) (void *), void *args)
+{
+ char *last_errstring = NULL;
+ int result;
+
+ (void) _dl_catch_error (&last_errstring, operate, args);
+
+ result = last_errstring != NULL;
+ if (result)
+ free (last_errstring);
+
+ return result;
+}
+
+/* These functions are called by dlerror_run... */
+
+struct do_dlopen_args
+{
+ /* Argument to do_dlopen. */
+ const char *name;
+
+ /* Return from do_dlopen. */
+ struct link_map *map;
+};
+
+struct do_dlsym_args
+{
+ /* Arguments to do_dlsym. */
+ struct link_map *map;
+ const char *name;
+
+ /* Return values of do_dlsym. */
+ ElfW(Addr) loadbase;
+ const ElfW(Sym) *ref;
+};
+
+static void
+do_dlopen (void *ptr)
+{
+ struct do_dlopen_args *args = (struct do_dlopen_args *) ptr;
+ /* Open and relocate the shared object. */
+ args->map = _dl_open (args->name, RTLD_LAZY, NULL);
+}
+
+static void
+do_dlsym (void *ptr)
+{
+ struct do_dlsym_args *args = (struct do_dlsym_args *) ptr;
+ args->ref = NULL;
+ args->loadbase = _dl_lookup_symbol (args->name, &args->ref,
+ args->map->l_local_scope,
+ args->map->l_name, 0);
+}
+
+static void
+do_dlclose (void *ptr)
+{
+ _dl_close ((struct link_map *) ptr);
+}
+
+/* ... and these functions call dlerror_run. */
+
+void *
+__libc_dlopen (const char *__name)
+{
+ struct do_dlopen_args args;
+ args.name = __name;
+
+ return (dlerror_run (do_dlopen, &args) ? NULL : (void *) args.map);
+}
+
+void *
+__libc_dlsym (void *__map, const char *__name)
+{
+ struct do_dlsym_args args;
+ args.map = __map;
+ args.name = __name;
+
+ return (dlerror_run (do_dlsym, &args) ? NULL
+ : (void *) (args.loadbase + args.ref->st_value));
+}
+
+int
+__libc_dlclose (void *__map)
+{
+ return dlerror_run (do_dlclose, __map);
+}