From 94e365c61202e2472c8aea42c7c95ce40f5b843c Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Wed, 7 Jul 1999 18:39:33 +0000 Subject: Update. * sysdeps/gnu/Makefile (libdl-routines): Add eval. 1999-07-06 Zack Weinberg * 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 --- dlfcn/dlerror.c | 144 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 144 insertions(+) create mode 100644 dlfcn/dlerror.c (limited to 'dlfcn/dlerror.c') 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 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 +#include +#include +#include +#include + +/* 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); +} -- cgit v1.2.3