OLD | NEW |
1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "net/base/host_resolver_proc.h" | 5 #include "net/base/host_resolver_proc.h" |
6 | 6 |
7 #include "build/build_config.h" | 7 #include "build/build_config.h" |
8 | 8 |
9 #if defined(OS_LINUX) | 9 #if defined(OS_LINUX) |
10 #include <resolv.h> | 10 #include <resolv.h> |
11 #endif | 11 #endif |
12 | 12 |
13 #include "base/logging.h" | 13 #include "base/logging.h" |
14 #include "base/time.h" | 14 #include "base/time.h" |
15 #include "net/base/address_list.h" | 15 #include "net/base/address_list.h" |
16 #include "net/base/net_errors.h" | 16 #include "net/base/net_errors.h" |
17 #include "net/base/sys_addrinfo.h" | 17 #include "net/base/sys_addrinfo.h" |
18 | 18 |
19 #if defined(OS_LINUX) | 19 #if defined(OS_LINUX) |
20 #include "base/singleton.h" | 20 #include "base/singleton.h" |
21 #include "base/thread_local_storage.h" | 21 #include "base/thread_local_storage.h" |
22 #endif | 22 #endif |
23 | 23 |
24 namespace net { | 24 namespace net { |
25 | 25 |
26 HostResolverProc* HostResolverProc::default_proc_ = NULL; | 26 HostResolverProc* HostResolverProc::default_proc_ = NULL; |
27 | 27 |
28 HostResolverProc::HostResolverProc(HostResolverProc* previous) { | 28 HostResolverProc::HostResolverProc(HostResolverProc* previous) { |
29 set_previous_proc(previous); | 29 SetPreviousProc(previous); |
30 | 30 |
31 // Implicitly fall-back to the global default procedure. | 31 // Implicitly fall-back to the global default procedure. |
32 if (!previous) | 32 if (!previous) |
33 set_previous_proc(default_proc_); | 33 SetPreviousProc(default_proc_); |
| 34 } |
| 35 |
| 36 void HostResolverProc::SetPreviousProc(HostResolverProc* proc) { |
| 37 HostResolverProc* current_previous = previous_proc_; |
| 38 previous_proc_ = NULL; |
| 39 // Now that we've guaranteed |this| is the last proc in a chain, we can |
| 40 // detect potential cycles using GetLastProc(). |
| 41 previous_proc_ = (GetLastProc(proc) == this) ? current_previous : proc; |
| 42 } |
| 43 |
| 44 void HostResolverProc::SetLastProc(HostResolverProc* proc) { |
| 45 GetLastProc(this)->SetPreviousProc(proc); |
| 46 } |
| 47 |
| 48 // static |
| 49 HostResolverProc* HostResolverProc::GetLastProc(HostResolverProc* proc) { |
| 50 if (proc == NULL) |
| 51 return NULL; |
| 52 HostResolverProc* last_proc = proc; |
| 53 while (last_proc->previous_proc_ != NULL) |
| 54 last_proc = last_proc->previous_proc_; |
| 55 return last_proc; |
34 } | 56 } |
35 | 57 |
36 // static | 58 // static |
37 HostResolverProc* HostResolverProc::SetDefault(HostResolverProc* proc) { | 59 HostResolverProc* HostResolverProc::SetDefault(HostResolverProc* proc) { |
38 HostResolverProc* old = default_proc_; | 60 HostResolverProc* old = default_proc_; |
39 default_proc_ = proc; | 61 default_proc_ = proc; |
40 return old; | 62 return old; |
41 } | 63 } |
42 | 64 |
43 // static | 65 // static |
(...skipping 150 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
194 #endif | 216 #endif |
195 | 217 |
196 if (err) | 218 if (err) |
197 return ERR_NAME_NOT_RESOLVED; | 219 return ERR_NAME_NOT_RESOLVED; |
198 | 220 |
199 addrlist->Adopt(ai); | 221 addrlist->Adopt(ai); |
200 return OK; | 222 return OK; |
201 } | 223 } |
202 | 224 |
203 } // namespace net | 225 } // namespace net |
OLD | NEW |