diff options
Diffstat (limited to 'winsup/cygwin/shared.cc')
| -rw-r--r-- | winsup/cygwin/shared.cc | 37 |
1 files changed, 32 insertions, 5 deletions
diff --git a/winsup/cygwin/shared.cc b/winsup/cygwin/shared.cc index a60d361fb..553caa2ba 100644 --- a/winsup/cygwin/shared.cc +++ b/winsup/cygwin/shared.cc @@ -84,16 +84,43 @@ open_shared (const char *name, int n, HANDLE& shared_h, DWORD size, m = SH_JUSTOPEN; else { + /* Beginning with Windows 2003 Server, a process doesn't necessarily + have the right to create globally accessible shared memory. If so, + creating the shared memory will fail with ERROR_ACCESS_DENIED if the + user doesn't have the SeCreateGlobalPrivilege privilege. If that + happened, we retry to create a shared memory object locally. This + only allows to see the processes in the current user session, but + that's better than nothing. */ + if (name) mapname = shared_name (map_buf, name, n); if (m == SH_JUSTOPEN) - shared_h = OpenFileMapping (access, FALSE, mapname); + { + shared_h = OpenFileMapping (access, FALSE, mapname); + if (!shared_h && wincap.has_create_global_privilege () + && GetLastError () == ERROR_FILE_NOT_FOUND) + shared_h = OpenFileMapping (access, FALSE, mapname + 7); + } else { - shared_h = CreateFileMapping (INVALID_HANDLE_VALUE, psa, PAGE_READWRITE, - 0, size, mapname); - if (GetLastError () == ERROR_ALREADY_EXISTS) - m = SH_JUSTOPEN; + shared_h = CreateFileMapping (INVALID_HANDLE_VALUE, psa, + PAGE_READWRITE, 0, size, mapname); + switch (GetLastError ()) + { + case ERROR_ALREADY_EXISTS: + m = SH_JUSTOPEN; + break; + case ERROR_ACCESS_DENIED: + if (wincap.has_create_global_privilege ()) + { + shared_h = CreateFileMapping (INVALID_HANDLE_VALUE, psa, + PAGE_READWRITE, 0, size, + mapname + 7); + if (GetLastError () == ERROR_ALREADY_EXISTS) + m = SH_JUSTOPEN; + } + break; + } } if (shared_h) /* ok! */; |