diff options
Diffstat (limited to 'winsup/cygwin/cygheap.cc')
| -rw-r--r-- | winsup/cygwin/cygheap.cc | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/winsup/cygwin/cygheap.cc b/winsup/cygwin/cygheap.cc index 31212666d..bc96a5533 100644 --- a/winsup/cygwin/cygheap.cc +++ b/winsup/cygwin/cygheap.cc @@ -23,6 +23,8 @@ #include "heap.h" #include "sigproc.h" #include "pinfo.h" +#include "registry.h" +#include "ntdll.h" #include <unistd.h> #include <wchar.h> @@ -138,6 +140,84 @@ _csbrk (int sbs) return prebrk; } +/* Use absolute path of cygwin1.dll to derive the Win32 dir which + is our installation_root. Note that we can't handle Cygwin installation + root dirs of more than 4K path length. I assume that's ok... + + This function also generates the installation_key value. It's a 64 bit + hash value based on the path of the Cygwin DLL itself. It's subsequently + used when generating shared object names. Thus, different Cygwin + installations generate different object names and so are isolated from + each other. + + Having this information, the installation key together with the + installation root path is written to the registry. The idea is that + cygcheck can print the paths into which the Cygwin DLL has been + installed for debugging purposes. + + Last but not least, the new cygwin properties datastrcuture is checked + for the "disabled_key" value, which is used to determine whether the + installation key is actually added to all object names or not. This is + used as a last resort for debugging purposes, usually. However, there + could be another good reason to re-enable object name collisions between + multiple Cygwin DLLs, which we're just not aware of right now. Cygcheck + can be used to change the value in an existing Cygwin DLL binary. */ +void +init_cygheap::init_installation_root () +{ + if (!GetModuleFileNameW (cygwin_hmodule, installation_root, PATH_MAX)) + api_fatal ("Can't initialize Cygwin installation root dir.\n" + "GetModuleFileNameW(%p, %p, %u), %E", + cygwin_hmodule, installation_root, PATH_MAX); + PWCHAR p = installation_root; + if (wcsncmp (p, L"\\\\?\\", 4)) /* No long path prefix. */ + { + if (!wcsncasecmp (p, L"\\\\", 2)) /* UNC */ + { + p = wcpcpy (p, L"\\??\\UN"); + GetModuleFileNameW (cygwin_hmodule, p, PATH_MAX - 6); + *p = L'C'; + } + else + { + p = wcpcpy (p, L"\\??\\"); + GetModuleFileNameW (cygwin_hmodule, p, PATH_MAX - 4); + } + } + installation_root[1] = L'?'; + + RtlInitEmptyUnicodeString (&installation_key, installation_key_buf, + sizeof installation_key_buf); + RtlInt64ToHexUnicodeString (hash_path_name (0, installation_root), + &installation_key, FALSE); + + PWCHAR w = wcsrchr (installation_root, L'\\'); + if (w) + { + *w = L'\0'; + w = wcsrchr (installation_root, L'\\'); + } + if (!w) + api_fatal ("Can't initialize Cygwin installation root dir.\n" + "Invalid DLL path"); + *w = L'\0'; + + for (int i = 1; i >= 0; --i) + { + reg_key r (i, KEY_WRITE, _WIDE (CYGWIN_INFO_INSTALLATIONS_NAME), + NULL); + if (NT_SUCCESS (r.set_string (installation_key_buf, + installation_root))) + break; + } + + if (cygwin_props.disable_key) + { + installation_key.Length = 0; + installation_key.Buffer[0] = L'\0'; + } +} + void __stdcall cygheap_init () { |