diff options
Diffstat (limited to 'newlib/libc/sys/linux/dl/dl-object.c')
| -rw-r--r-- | newlib/libc/sys/linux/dl/dl-object.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/newlib/libc/sys/linux/dl/dl-object.c b/newlib/libc/sys/linux/dl/dl-object.c new file mode 100644 index 000000000..1e2049e25 --- /dev/null +++ b/newlib/libc/sys/linux/dl/dl-object.c @@ -0,0 +1,163 @@ +/* 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; +} |