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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [dl/] [dl-object.c] - Rev 262
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/* Storage management for the chain of loaded shared objects. 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 <errno.h> #include <string.h> #include <stdlib.h> #include <unistd.h> #include <ldsodefs.h> #include <assert.h> /* Allocate a `struct link_map' for a new object being loaded, and enter it into the _dl_loaded list. */ struct link_map * internal_function _dl_new_object (char *realname, const char *libname, int type, struct link_map *loader) { struct link_map *l; int idx; size_t libname_len = strlen (libname) + 1; struct link_map *new; struct libname_list *newname; new = (struct link_map *) calloc (sizeof (*new) + sizeof (*newname) + libname_len, 1); if (new == NULL) return NULL; new->l_libname = newname = (struct libname_list *) (new + 1); newname->name = (char *) memcpy (newname + 1, libname, libname_len); /* newname->next = NULL; We use calloc therefore not necessary. */ newname->dont_free = 1; new->l_name = realname; new->l_type = type; new->l_loader = loader; /* new->l_global = 0; We use calloc therefore not necessary. */ /* Use the 'l_scope_mem' array by default for the the 'l_scope' information. If we need more entries we will allocate a large array dynamically. */ new->l_scope = new->l_scope_mem; new->l_scope_max = sizeof (new->l_scope_mem) / sizeof (new->l_scope_mem[0]); /* Counter for the scopes we have to handle. */ idx = 0; if (_dl_loaded != NULL) { l = _dl_loaded; while (l->l_next != NULL) l = l->l_next; new->l_prev = l; /* new->l_next = NULL; Would be necessary but we use calloc. */ l->l_next = new; /* Add the global scope. */ new->l_scope[idx++] = &_dl_loaded->l_searchlist; } else _dl_loaded = new; ++_dl_nloaded; /* If we have no loader the new object acts as it. */ if (loader == NULL) loader = new; else /* Determine the local scope. */ while (loader->l_loader != NULL) loader = loader->l_loader; /* Insert the scope if it isn't the global scope we already added. */ if (idx == 0 || &loader->l_searchlist != new->l_scope[0]) new->l_scope[idx] = &loader->l_searchlist; new->l_local_scope[0] = &new->l_searchlist; /* Don't try to find the origin for the main map which has the name "". */ if (realname[0] != '\0') { size_t realname_len = strlen (realname) + 1; char *origin; char *cp; if (realname[0] == '/') { /* It is an absolute path. Use it. But we have to make a copy since we strip out the trailing slash. */ cp = origin = (char *) malloc (realname_len); if (origin == NULL) { origin = (char *) -1; goto out; } } else { size_t len = realname_len; char *result = NULL; /* Get the current directory name. */ origin = NULL; do { len += 128; origin = (char *) realloc (origin, len); } while (origin != NULL && (result = getcwd (origin, len - realname_len)) == NULL && errno == ERANGE); if (result == NULL) { /* We were not able to determine the current directory. Note that free(origin) is OK if origin == NULL. */ free (origin); origin = (char *) -1; goto out; } /* Find the end of the path and see whether we have to add a slash. */ cp = memchr (origin, '\0', strlen(origin)); if (cp[-1] != '/') *cp++ = '/'; } /* Add the real file name. */ memcpy (cp, realname, realname_len); /* Now remove the filename and the slash. Leave the slash if it the name is something like "/foo". */ cp = strrchr (origin, '/'); if (cp == origin) origin[1] = '\0'; else *cp = '\0'; out: new->l_origin = origin; } return new; }
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