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authorUlrich Drepper <drepper@redhat.com>1999-08-01 19:24:38 +0000
committerUlrich Drepper <drepper@redhat.com>1999-08-01 19:24:38 +0000
commit4f2793d41f1043cf04f6761b1da00d8741824087 (patch)
tree4438801b2a8444e7c83b62c3bd64ae833dc63ee1 /dlfcn/dlerror.c
parent7730a3b9d420136fc8a001d1ebd6c68cd0c005a3 (diff)
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Update.
1999-08-01 Ulrich Drepper <drepper@cygnus.com> * elf/dl-sym.c (_dl_sym): Always determine module of the caller to pass it to _dl_lookup_symbol. * elf/dl-error.c (_dl_signal_error): Optimize string generation a bit. Reword message. * dlfcn/dlerror.c: Make code thread-safe.
Diffstat (limited to 'dlfcn/dlerror.c')
-rw-r--r--dlfcn/dlerror.c49
1 files changed, 28 insertions, 21 deletions
diff --git a/dlfcn/dlerror.c b/dlfcn/dlerror.c
index c43d511156..b4ffde5fdf 100644
--- a/dlfcn/dlerror.c
+++ b/dlfcn/dlerror.c
@@ -1,5 +1,5 @@
/* Return error detail for failing <dlfcn.h> functions.
- Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
+ 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
@@ -27,6 +27,7 @@
struct dl_action_result
{
int errcode;
+ int returned;
char *errstring;
};
static struct dl_action_result last_result;
@@ -44,38 +45,41 @@ static void free_key_mem (void *mem);
char *
dlerror (void)
{
- static char *buf;
+ char *buf;
struct dl_action_result *result;
- if (buf)
- {
- free (buf);
- buf = NULL;
- }
-
/* Get error string. */
result = (struct dl_action_result *) __libc_getspecific (key);
if (result == NULL)
result = &last_result;
- if (! result->errstring)
- return NULL;
-
- if (result->errcode == 0)
- buf = result->errstring;
+ /* Test whether we already returned the string. */
+ if (result->returned != 0)
+ {
+ /* We can now free the string. */
+ if (result->errstring != NULL)
+ {
+ free (result->errstring);
+ result->errstring = NULL;
+ }
+ buf = NULL;
+ }
else
{
- if (__asprintf (&buf, "%s: %s",
- result->errstring, strerror (result->errcode)) == -1)
- buf = NULL;
+ buf = result->errstring;
+ if (result->errcode != 0
+ && __asprintf (&buf, "%s: %s",
+ result->errstring, strerror (result->errcode)) != -1)
+ {
+ /* We don't need the error string anymore. */
+ free (result->errstring);
+ result->errstring = buf;
+ }
- /* We don't need the error string anymore. */
- free (result->errstring);
+ /* Mark the error as returned. */
+ result->returned = 1;
}
- /* Reset the error indicator. */
- result->errstring = NULL;
-
return buf;
}
@@ -119,6 +123,9 @@ _dlerror_run (void (*operate) (void *), void *args)
result->errcode = _dl_catch_error (&result->errstring, operate, args);
+ /* If no error we mark that no error string is available. */
+ result->returned = result->errstring == NULL;
+
return result->errstring != NULL;
}