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-rw-r--r--winsup/cygwin/shared.cc144
1 files changed, 99 insertions, 45 deletions
diff --git a/winsup/cygwin/shared.cc b/winsup/cygwin/shared.cc
index aad6c9499..ed3021cab 100644
--- a/winsup/cygwin/shared.cc
+++ b/winsup/cygwin/shared.cc
@@ -26,12 +26,96 @@ details. */
#include "ntdll.h"
#include <alloca.h>
#include <wchar.h>
+#include <wingdi.h>
+#include <winuser.h>
shared_info NO_COPY *cygwin_shared;
user_info NO_COPY *user_shared;
HANDLE NO_COPY cygwin_shared_h;
HANDLE NO_COPY cygwin_user_h;
+WCHAR installation_root[PATH_MAX] __attribute__((section (".cygwin_dll_common"), shared));
+UNICODE_STRING installation_key __attribute__((section (".cygwin_dll_common"), shared));
+WCHAR installation_key_buf[18] __attribute__((section (".cygwin_dll_common"), shared));
+
+/* 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_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, CYGWIN_INFO_INSTALLATIONS_NAME, NULL);
+ if (r.set_string (installation_key_buf, installation_root)
+ == ERROR_SUCCESS)
+ break;
+ }
+
+ if (cygwin_props.disable_key)
+ {
+ installation_key.Length = 0;
+ installation_key.Buffer[0] = L'\0';
+ }
+}
+
/* This function returns a handle to the top-level directory in the global
NT namespace used to implement global objects including shared memory. */
@@ -46,9 +130,10 @@ get_shared_parent_dir ()
if (!dir)
{
WCHAR bnoname[MAX_PATH];
- __small_swprintf (bnoname, L"\\BaseNamedObjects\\%s%s",
+ __small_swprintf (bnoname, L"\\BaseNamedObjects\\%s%s-%S",
cygwin_version.shared_id,
- _cygwin_testing ? cygwin_version.dll_build_date : "");
+ _cygwin_testing ? cygwin_version.dll_build_date : "",
+ &installation_key);
RtlInitUnicodeString (&uname, bnoname);
InitializeObjectAttributes (&attr, &uname, OBJ_INHERIT | OBJ_OPENIF,
NULL, everyone_sd (CYG_SHARED_DIR_ACCESS));
@@ -79,9 +164,10 @@ get_session_parent_dir ()
{
WCHAR bnoname[MAX_PATH];
__small_swprintf (bnoname,
- L"\\Sessions\\BNOLINKS\\%d\\%s%s",
+ L"\\Sessions\\BNOLINKS\\%d\\%s%s-%S",
psi.SessionId, cygwin_version.shared_id,
- _cygwin_testing ? cygwin_version.dll_build_date : "");
+ _cygwin_testing ? cygwin_version.dll_build_date : "",
+ &installation_key);
RtlInitUnicodeString (&uname, bnoname);
InitializeObjectAttributes (&attr, &uname, OBJ_INHERIT | OBJ_OPENIF,
NULL, everyone_sd(CYG_SHARED_DIR_ACCESS));
@@ -270,46 +356,6 @@ shared_destroy ()
UnmapViewOfFile (user_shared);
}
-/* 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... */
-void
-shared_info::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'?';
-
- 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';
-}
-
/* Initialize obcaseinsensitive. Default to case insensitive on pre-XP. */
void
shared_info::init_obcaseinsensitive ()
@@ -349,7 +395,6 @@ shared_info::initialize ()
if (!sversion)
{
- init_installation_root ();/* Initialize installation root dir. */
init_obcaseinsensitive ();/* Initialize obcaseinsensitive. */
tty.init (); /* Initialize tty table. */
mt.initialize (); /* Initialize shared tape information. */
@@ -373,6 +418,10 @@ memory_init (bool init_cygheap)
cygheap->user.init ();
}
+ /* Initialize installation root dir. */
+ if (!installation_root[0])
+ init_installation_root ();
+
/* Initialize general shared memory */
shared_locations sh_cygwin_shared;
cygwin_shared = (shared_info *) open_shared (L"shared",
@@ -380,6 +429,11 @@ memory_init (bool init_cygheap)
cygwin_shared_h,
sizeof (*cygwin_shared),
sh_cygwin_shared = SH_CYGWIN_SHARED);
+ /* Defer debug output printing the installation root and installation key
+ up to this point. Debug output except for system_printf requires
+ the global shared memory to exist. */
+ debug_printf ("Installation root: <%W> key: <%S>",
+ installation_root, &installation_key);
cygwin_shared->initialize ();
user_shared_create (false);
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-12 15:07:55 +0000