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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/dlerror.c
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/dlerror.c')
-rw-r--r--dlfcn/dlerror.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/dlfcn/dlerror.c b/dlfcn/dlerror.c
new file mode 100644
index 0000000000..c43d511156
--- /dev/null
+++ b/dlfcn/dlerror.c
@@ -0,0 +1,144 @@
+/* Return error detail for failing <dlfcn.h> functions.
+ 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
+ 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 <stdio.h>
+#include <stdlib.h>
+#include <string.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);
+
+
+char *
+dlerror (void)
+{
+ static 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;
+ else
+ {
+ 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. */
+ result->errstring = NULL;
+
+ return buf;
+}
+
+int
+internal_function
+_dlerror_run (void (*operate) (void *), void *args)
+{
+ __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 (result->errstring);
+
+ result->errcode = _dl_catch_error (&result->errstring, operate, args);
+
+ return result->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);
+}