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authorUlrich Drepper <drepper@redhat.com>1998-03-12 17:26:19 +0000
committerUlrich Drepper <drepper@redhat.com>1998-03-12 17:26:19 +0000
commit8d9618b7f6ecbcd04fd572140bbecaf9be10d376 (patch)
treece9f6b373142f8875c9d6a4543e20c732afab18a /elf
parenteb13b9a02d939ee7440472c5a5f86e55f3adbd54 (diff)
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Update.
1998-03-12 13:11 Tim Waugh <tim@cyberelk.demon.co.uk> * posix/wordexp-test.c: More tests. (main): Set up arena for pathname expansion tests (in a temporary directory). (testit): Don't check word count or word vector if return value is non-zero. * posix/wordexp.c (exec_comm): Always chop off terminating linefeed (just like bash does). (parse_param): Change lots of occurrences of "if (!*env)" to "if (!env || !*env)". (parse_param): For assignment inside parameter expansion, use all expanded words in assignment rather than just the first. (parse_param): Corrected return value for parameter expansion of an unset variable when WRDE_UNDEF is in effect. (parse_dollars): Don't field-split if quoted. (wordexp): Opening brace character isn't allowed unquoted. 1998-03-12 Ulrich Drepper <drepper@cygnus.com> * elf/dlerror.c: Fix concurrency problems with error string and number. * elf/dl-deps.c (_dl_map_object_deps): Print debug info when filter/auxiliary are being loaded. 1998-03-12 14:24 Ulrich Drepper <drepper@cygnus.com> * elf/dlerror.c (last_object_name): Removed. (dlerror): Don't use last_object_name. (_dl_error_run): Omit second argument to _dl_catch_error. * elf/dl-error.c (struct catch): Remove objname member. (_dl_signal_error): Construct string including objname when given. (_dl_catch_error): Remove objname handling. * elf/link.h (_dl_catch_error): Fix prototype and comment. * elf/rtld.c (dl_main): Call _dl_catch_error correctly. * elf/dl-deps.c (_dl_map_objet_deps): Likewise. * nss/nsswitch.c (nss_dlerror_run): Likewise. * iconv/gconv_dl.c (dlerror_run): Likewise. [Corrects PR libc/501].
Diffstat (limited to 'elf')
-rw-r--r--elf/dl-deps.c33
-rw-r--r--elf/dl-error.c20
-rw-r--r--elf/dlerror.c127
-rw-r--r--elf/link.h9
-rw-r--r--elf/rtld.c3
5 files changed, 142 insertions, 50 deletions
diff --git a/elf/dl-deps.c b/elf/dl-deps.c
index 76e71d7..6327098 100644
--- a/elf/dl-deps.c
+++ b/elf/dl-deps.c
@@ -194,7 +194,6 @@ _dl_map_object_deps (struct link_map *map,
else if (d->d_tag == DT_AUXILIARY || d->d_tag == DT_FILTER)
{
char *errstring;
- const char *objname;
struct list *newp;
if (d->d_tag == DT_AUXILIARY)
@@ -202,9 +201,18 @@ _dl_map_object_deps (struct link_map *map,
/* Store the tag in the argument structure. */
args.d = d;
+ /* Say that we are about to load an auxiliary library. */
+ if (_dl_debug_libs)
+ _dl_debug_message ("load auxiliary object=",
+ strtab + d->d_un.d_val,
+ " requested by file=",
+ l->l_name[0]
+ ? l->l_name : _dl_argv[0],
+ "\n", NULL);
+
/* We must be prepared that the addressed shared
object is not available. */
- if (_dl_catch_error (&errstring, &objname, openaux, &args))
+ if (_dl_catch_error (&errstring, openaux, &args))
{
/* We are not interested in the error message. */
assert (errstring != NULL);
@@ -215,11 +223,22 @@ _dl_map_object_deps (struct link_map *map,
}
}
else
- /* For filter objects the dependency must be available. */
- args.aux = _dl_map_object (l, strtab + d->d_un.d_val, 0,
- (l->l_type == lt_executable
- ? lt_library : l->l_type),
- trace_mode);
+ {
+ /* Say that we are about to load an auxiliary library. */
+ if (_dl_debug_libs)
+ _dl_debug_message ("load filtered object=",
+ strtab + d->d_un.d_val,
+ " requested by file=",
+ l->l_name[0]
+ ? l->l_name : _dl_argv[0],
+ "\n", NULL);
+
+ /* For filter objects the dependency must be available. */
+ args.aux = _dl_map_object (l, strtab + d->d_un.d_val, 0,
+ (l->l_type == lt_executable
+ ? lt_library : l->l_type),
+ trace_mode);
+ }
/* The auxiliary object is actually available.
Incorporate the map in all the lists. */
diff --git a/elf/dl-error.c b/elf/dl-error.c
index 6945ea8..5b4c0a3 100644
--- a/elf/dl-error.c
+++ b/elf/dl-error.c
@@ -31,7 +31,6 @@ extern char *_strerror_internal __P ((int, char *, size_t));
struct catch
{
char *errstring; /* Error detail filled in here. */
- const char *objname;
jmp_buf env; /* longjmp here on error. */
};
@@ -59,11 +58,18 @@ _dl_signal_error (int errcode,
/* We are inside _dl_catch_error. Return to it. We have to
duplicate the error string since it might be allocated on the
stack. */
- size_t len = strlen (errstring) + 1;
- catch->errstring = malloc (len);
+ size_t objname_len = objname ? strlen (objname) + 2 : 0;
+ size_t errstring_len = strlen (errstring) + 1;
+ catch->errstring = malloc (objname_len + errstring_len);
if (catch->errstring != NULL)
- memcpy (catch->errstring, errstring, len);
- catch->objname = objname;
+ {
+ if (objname_len > 0)
+ {
+ memcpy (catch->errstring, objname, objname_len - 2);
+ memcpy (catch->errstring + objname_len - 2, ": ", 2);
+ }
+ memcpy (catch->errstring + objname_len, errstring, errstring_len);
+ }
longjmp (catch->env, errcode ?: -1);
}
else if (receiver)
@@ -89,7 +95,6 @@ _dl_signal_error (int errcode,
int
_dl_catch_error (char **errstring,
- const char **objname,
void (*operate) (void *),
void *args)
{
@@ -101,7 +106,6 @@ _dl_catch_error (char **errstring,
/* Some systems (e.g., SPARC) handle constructors to local variables
inefficient. So we initialize `c' by hand. */
c.errstring = NULL;
- c.objname = NULL;
old = catch;
errcode = setjmp (c.env);
@@ -111,14 +115,12 @@ _dl_catch_error (char **errstring,
(*operate) (args);
catch = old;
*errstring = NULL;
- *objname = NULL;
return 0;
}
/* We get here only if we longjmp'd out of OPERATE. */
catch = old;
*errstring = c.errstring;
- *objname = c.objname;
return errcode == -1 ? 0 : errcode;
}
diff --git a/elf/dlerror.c b/elf/dlerror.c
index e2b1ac9..3edafe4 100644
--- a/elf/dlerror.c
+++ b/elf/dlerror.c
@@ -1,5 +1,5 @@
/* Return error detail for failing <dlfcn.h> functions.
- Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
+ Copyright (C) 1995, 1996, 1997, 1998 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
@@ -22,16 +22,32 @@
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
+#include <bits/libc-lock.h>
+
+
+/* Type for storing results of dynamic loading actions. */
+struct dl_action_result
+ {
+ int errcode;
+ char *errstring;
+ };
+static struct dl_action_result last_result;
+static struct dl_action_result *static_buf;
+
+
+/* This is the key for the thread specific memory. */
+static __libc_key_t key;
+
+/* Destructor for the thread-specific data. */
+static void init (void);
+static void free_key_mem (void *mem);
-static int last_errcode;
-static char *last_errstring;
-static const char *last_object_name;
char *
dlerror (void)
{
static char *buf;
- char *ret;
+ struct dl_action_result *result;
if (buf)
{
@@ -39,39 +55,96 @@ dlerror (void)
buf = NULL;
}
- if (! last_errstring)
+ /* Get error string. */
+ if (__libc_internal_tsd_get != NULL)
+ {
+ result = (struct dl_action_result *) __libc_getspecific (key);
+ if (result == NULL)
+ result = &last_result;
+ }
+ else
+ result = &last_result;
+
+ if (! result->errstring)
return NULL;
- if (last_errcode == 0 && ! last_object_name)
- ret = (char *) last_errstring;
- else if (last_errcode == 0)
- ret = (asprintf (&buf, "%s: %s", last_object_name, last_errstring) == -1
- ? NULL : buf);
- else if (! last_object_name)
- ret = (asprintf (&buf, "%s: %s",
- last_errstring, strerror (last_errcode)) == -1
- ? NULL : buf);
+ if (result->errcode == 0)
+ buf = result->errstring;
else
- ret = (asprintf (&buf, "%s: %s: %s",
- last_object_name, last_errstring,
- strerror (last_errcode)) == -1
- ? NULL : buf);
+ {
+ if (asprintf (&buf, "%s: %s",
+ result->errstring, strerror (result->errcode)) == -1)
+ buf = NULL;
+
+ /* We don't need the error string anymore. */
+ free (result->errstring);
+ }
/* Reset the error indicator. */
- free (last_errstring);
- last_errstring = NULL;
- return ret;
+ result->errstring = NULL;
+
+ return buf;
}
int
_dlerror_run (void (*operate) (void *), void *args)
{
- if (last_errstring != NULL)
+ __libc_once_define (static, once);
+ struct dl_action_result *result;
+
+ /* If we have not yet initialized the buffer do it now. */
+ __libc_once (once, init);
+
+ /* Get error string and number. */
+ if (static_buf != NULL)
+ result = static_buf;
+ else
+ {
+ /* We don't use the static buffer and so we have a key. Use it
+ to get the thread-specific buffer. */
+ result = __libc_getspecific (key);
+ if (result == NULL)
+ {
+ result = (struct dl_action_result *) calloc (1, sizeof (*result));
+ if (result == NULL)
+ /* We are out of memory. Since this is no really critical
+ situation we carry on by using the global variable.
+ This might lead to conflicts between the threads but
+ they soon all will have memory problems. */
+ result = &last_result;
+ else
+ /* Set the tsd. */
+ __libc_setspecific (key, result);
+ }
+ }
+
+ if (result->errstring != NULL)
/* Free the error string from the last failed command. This can
happen if `dlerror' was not run after an error was found. */
- free (last_errstring);
+ free (result->errstring);
+
+ result->errcode = _dl_catch_error (&result->errstring, operate, args);
+
+ return result->errstring != NULL;
+}
+
- last_errcode = _dl_catch_error (&last_errstring, &last_object_name,
- operate, args);
- return last_errstring != NULL;
+/* Initialize buffers for results. */
+static void
+init (void)
+{
+ if (__libc_key_create (&key, free_key_mem))
+ /* Creating the key failed. This means something really went
+ wrong. In any case use a static buffer which is better than
+ nothing. */
+ static_buf = &last_result;
+}
+
+
+/* Free the thread specific data, this is done if a thread terminates. */
+static void
+free_key_mem (void *mem)
+{
+ free (mem);
+ __libc_setspecific (key, NULL);
}
diff --git a/elf/link.h b/elf/link.h
index bd9b9e4..9b0f898 100644
--- a/elf/link.h
+++ b/elf/link.h
@@ -313,13 +313,12 @@ extern void _dl_signal_error (int errcode,
const char *errstring);
/* Call OPERATE, catching errors from `dl_signal_error'. If there is no
- error, *ERRSTRING is set to null. If there is an error, *ERRSTRING and
- *OBJECT are set to the strings passed to _dl_signal_error, and the error
- code passed is the return value. ERRSTRING if nonzero points to a
- malloc'ed string which the caller has to free after use.
+ error, *ERRSTRING is set to null. If there is an error, *ERRSTRING is
+ set to a string constructed from the strings passed to _dl_signal_error,
+ and the error code passed is the return value. ERRSTRING if nonzero
+ points to a malloc'ed string which the caller has to free after use.
ARGS is passed as argument to OPERATE. */
extern int _dl_catch_error (char **errstring,
- const char **object,
void (*operate) (void *),
void *args);
diff --git a/elf/rtld.c b/elf/rtld.c
index a7e89e7..168fd1b 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -380,11 +380,10 @@ of this helper program; chances are you did not intend to run this program.\n\
if (mode == verify)
{
char *err_str = NULL;
- const char *obj_name __attribute__ ((unused));
struct map_args args;
args.str = _dl_argv[0];
- (void) _dl_catch_error (&err_str, &obj_name, map_doit, &args);
+ (void) _dl_catch_error (&err_str, map_doit, &args);
main_map = args.main_map;
if (err_str != NULL)
{