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[/] [openrisc/] [tags/] [gnu-src/] [newlib-1.18.0/] [newlib-1.18.0-or32-1.0rc2/] [newlib/] [libc/] [sys/] [linux/] [dl/] [dl-error.c] - Rev 520
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/* Error handling for runtime dynamic linker. Copyright (C) 1995,96,97,98,99,2000,2001 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 Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <libintl.h> #include <setjmp.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <ldsodefs.h> #include <sys/libc-tsd.h> /* This structure communicates state between _dl_catch_error and _dl_signal_error. */ struct catch { const char *objname; /* Object/File name. */ const char *errstring; /* Error detail filled in here. */ jmp_buf env; /* longjmp here on error. */ }; /* Multiple threads at once can use the `_dl_catch_error' function. The calls can come from `_dl_map_object_deps', `_dlerror_run', or from any of the libc functionality which loads dynamic objects (NSS, iconv). Therefore we have to be prepared to save the state in thread-local memory. */ __libc_tsd_define (static, DL_ERROR) #define tsd_getspecific() __libc_tsd_get (DL_ERROR) #define tsd_setspecific(data) __libc_tsd_set (DL_ERROR, (data)) /* This message we return as a last resort. We define the string in a variable since we have to avoid freeing it and so have to enable a pointer comparison. See below and in dlfcn/dlerror.c. */ const char _dl_out_of_memory[] = "out of memory"; /* This points to a function which is called when an continuable error is received. Unlike the handling of `catch' this function may return. The arguments will be the `errstring' and `objname'. Since this functionality is not used in normal programs (only in ld.so) we do not care about multi-threaded programs here. We keep this as a global variable. */ static receiver_fct receiver; void internal_function _dl_signal_error (int errcode, const char *objname, const char *occation, const char *errstring) { struct catch *lcatch; if (! errstring) errstring = N_("DYNAMIC LINKER BUG!!!"); lcatch = tsd_getspecific (); if (objname == NULL) objname = ""; if (lcatch != NULL) { /* We are inside _dl_catch_error. Return to it. We have to duplicate the error string since it might be allocated on the stack. The object name is always a string constant. */ size_t len_objname = strlen (objname) + 1; size_t len_errstring = strlen (errstring) + 1; lcatch->errstring = (char *) malloc (len_objname + len_errstring); if (lcatch->errstring != NULL) { char *tmp; /* Make a copy of the object file name and the error string. */ tmp = memcpy ((char *) lcatch->errstring, errstring, len_errstring); tmp += len_errstring; lcatch->objname = memcpy (tmp, objname, len_objname); } else { /* This is better than nothing. */ lcatch->objname = ""; lcatch->errstring = _dl_out_of_memory; } longjmp (lcatch->env, errcode ?: -1); } else { /* Lossage while resolving the program's own symbols is always fatal. */ char buffer[1024]; _dl_fatal_printf ("%s: %s: %s%s%s%s%s\n", _dl_argv[0] ?: "<program name unknown>", occation ?: N_("error while loading shared libraries"), objname, *objname ? ": " : "", errstring, errcode ? ": " : "", (errcode ? __strerror_r (errcode, buffer, sizeof buffer) : "")); } } void internal_function _dl_signal_cerror (int errcode, const char *objname, const char *occation, const char *errstring) { if (receiver) { /* We are inside _dl_receive_error. Call the user supplied handler and resume the work. The receiver will still be installed. */ (*receiver) (errcode, objname, errstring); } else _dl_signal_error (errcode, objname, occation, errstring); } int internal_function _dl_catch_error (const char **objname, const char **errstring, void (*operate) (void *), void *args) { int errcode; struct catch *volatile old; struct catch c; /* We need not handle `receiver' since setting a `catch' is handled before it. */ /* Some systems (e.g., SPARC) handle constructors to local variables inefficient. So we initialize `c' by hand. */ c.errstring = NULL; old = tsd_getspecific (); errcode = setjmp (c.env); if (__builtin_expect (errcode, 0) == 0) { tsd_setspecific (&c); (*operate) (args); tsd_setspecific (old); *objname = NULL; *errstring = NULL; return 0; } /* We get here only if we longjmp'd out of OPERATE. */ tsd_setspecific (old); *objname = c.objname; *errstring = c.errstring; return errcode == -1 ? 0 : errcode; } void internal_function _dl_receive_error (receiver_fct fct, void (*operate) (void *), void *args) { struct catch *old_catch; receiver_fct old_receiver; old_catch = tsd_getspecific (); old_receiver = receiver; /* Set the new values. */ tsd_setspecific (NULL); receiver = fct; (*operate) (args); tsd_setspecific (old_catch); receiver = old_receiver; }