Update.
[glibc.git] / elf / dl-object.c
blobb46ebdc33f543ae9c5874fc052452d4f7f2dc0d6
1 /* Storage management for the chain of loaded shared objects.
2 Copyright (C) 1995-2002, 2004 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <errno.h>
21 #include <string.h>
22 #include <stdlib.h>
23 #include <unistd.h>
24 #include <ldsodefs.h>
26 #include <assert.h>
29 /* Allocate a `struct link_map' for a new object being loaded,
30 and enter it into the _dl_loaded list. */
32 struct link_map *
33 internal_function
34 _dl_new_object (char *realname, const char *libname, int type,
35 struct link_map *loader, int mode, Lmid_t nsid)
37 struct link_map *l;
38 int idx;
39 size_t libname_len = strlen (libname) + 1;
40 struct link_map *new;
41 struct libname_list *newname;
43 new = (struct link_map *) calloc (sizeof (*new) + sizeof (*newname)
44 + libname_len, 1);
45 if (new == NULL)
46 return NULL;
48 new->l_real = new;
49 new->l_libname = newname = (struct libname_list *) (new + 1);
50 newname->name = (char *) memcpy (newname + 1, libname, libname_len);
51 /* newname->next = NULL; We use calloc therefore not necessary. */
52 newname->dont_free = 1;
54 new->l_name = realname;
55 new->l_type = type;
56 new->l_loader = loader;
57 #if defined USE_TLS && NO_TLS_OFFSET != 0
58 new->l_tls_offset = NO_TLS_OFFSET;
59 #endif
60 new->l_ns = nsid;
62 /* new->l_global = 0; We use calloc therefore not necessary. */
64 /* Use the 'l_scope_mem' array by default for the the 'l_scope'
65 information. If we need more entries we will allocate a large
66 array dynamically. */
67 new->l_scope = new->l_scope_mem;
68 new->l_scope_max = sizeof (new->l_scope_mem) / sizeof (new->l_scope_mem[0]);
70 /* Counter for the scopes we have to handle. */
71 idx = 0;
73 if (GL(dl_ns)[nsid]._ns_loaded != NULL)
75 l = GL(dl_ns)[nsid]._ns_loaded;
76 while (l->l_next != NULL)
77 l = l->l_next;
78 new->l_prev = l;
79 /* new->l_next = NULL; Would be necessary but we use calloc. */
80 l->l_next = new;
82 /* Add the global scope. */
83 new->l_scope[idx++] = &GL(dl_ns)[nsid]._ns_loaded->l_searchlist;
85 else
86 GL(dl_ns)[nsid]._ns_loaded = new;
87 ++GL(dl_ns)[nsid]._ns_nloaded;
88 ++GL(dl_load_adds);
90 /* If we have no loader the new object acts as it. */
91 if (loader == NULL)
92 loader = new;
93 else
94 /* Determine the local scope. */
95 while (loader->l_loader != NULL)
96 loader = loader->l_loader;
98 /* Insert the scope if it isn't the global scope we already added. */
99 if (idx == 0 || &loader->l_searchlist != new->l_scope[0])
101 if ((mode & RTLD_DEEPBIND) != 0 && idx != 0)
103 new->l_scope[1] = new->l_scope[0];
104 idx = 0;
107 new->l_scope[idx] = &loader->l_searchlist;
110 new->l_local_scope[0] = &new->l_searchlist;
112 /* Don't try to find the origin for the main map which has the name "". */
113 if (realname[0] != '\0')
115 size_t realname_len = strlen (realname) + 1;
116 char *origin;
117 char *cp;
119 if (realname[0] == '/')
121 /* It is an absolute path. Use it. But we have to make a
122 copy since we strip out the trailing slash. */
123 cp = origin = (char *) malloc (realname_len);
124 if (origin == NULL)
126 origin = (char *) -1;
127 goto out;
130 else
132 size_t len = realname_len;
133 char *result = NULL;
135 /* Get the current directory name. */
136 origin = NULL;
139 char *new_origin;
141 len += 128;
142 new_origin = (char *) realloc (origin, len);
143 if (new_origin == NULL)
144 /* We exit the loop. Note that result == NULL. */
145 break;
146 origin = new_origin;
148 while ((result = __getcwd (origin, len - realname_len)) == NULL
149 && errno == ERANGE);
151 if (result == NULL)
153 /* We were not able to determine the current directory.
154 Note that free(origin) is OK if origin == NULL. */
155 free (origin);
156 origin = (char *) -1;
157 goto out;
160 /* Find the end of the path and see whether we have to add a
161 slash. We could use rawmemchr but this need not be
162 fast. */
163 cp = (strchr) (origin, '\0');
164 if (cp[-1] != '/')
165 *cp++ = '/';
168 /* Add the real file name. */
169 cp = __mempcpy (cp, realname, realname_len);
171 /* Now remove the filename and the slash. Leave the slash if
172 the name is something like "/foo". */
174 --cp;
175 while (*cp != '/');
177 if (cp == origin)
178 /* Keep the only slash which is the first character. */
179 ++cp;
180 *cp = '\0';
182 out:
183 new->l_origin = origin;
186 return new;