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Diffstat (limited to 'winsup/cygwin/shared.cc')
| -rw-r--r-- | winsup/cygwin/shared.cc | 492 |
1 files changed, 0 insertions, 492 deletions
diff --git a/winsup/cygwin/shared.cc b/winsup/cygwin/shared.cc deleted file mode 100644 index 10d03b088..000000000 --- a/winsup/cygwin/shared.cc +++ /dev/null @@ -1,492 +0,0 @@ -/* shared.cc: shared data area support. - - Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, - 2006, 2007, 2008, 2009 Red Hat, Inc. - -This file is part of Cygwin. - -This software is a copyrighted work licensed under the terms of the -Cygwin license. Please consult the file "CYGWIN_LICENSE" for -details. */ - -#include "winsup.h" -#include "miscfuncs.h" -#include <unistd.h> -#include "cygerrno.h" -#include "pinfo.h" -#include "path.h" -#include "fhandler.h" -#include "dtable.h" -#include "cygheap.h" -#include "heap.h" -#include "shared_info_magic.h" -#include "registry.h" -#include "cygwin_version.h" -#include "pwdgrp.h" -#include "spinlock.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)); -static LONG installation_root_inited __attribute__((section (".cygwin_dll_common"), shared)); - -#define SPIN_WAIT 10000 - -/* 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 inline -init_installation_root () -{ - spinlock iri (installation_root_inited); - if (!iri) - { - 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. */ - -HANDLE -get_shared_parent_dir () -{ - static HANDLE dir; - UNICODE_STRING uname; - OBJECT_ATTRIBUTES attr; - NTSTATUS status; - - if (!dir) - { - WCHAR bnoname[MAX_PATH]; - __small_swprintf (bnoname, L"\\BaseNamedObjects\\%s%s-%S", - cygwin_version.shared_id, - _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)); - status = NtCreateDirectoryObject (&dir, CYG_SHARED_DIR_ACCESS, &attr); - if (!NT_SUCCESS (status)) - api_fatal ("NtCreateDirectoryObject(%S): %p", &uname, status); - } - return dir; -} - -HANDLE -get_session_parent_dir () -{ - static HANDLE dir; - UNICODE_STRING uname; - OBJECT_ATTRIBUTES attr; - NTSTATUS status; - - if (!dir) - { - PROCESS_SESSION_INFORMATION psi; - status = NtQueryInformationProcess (NtCurrentProcess (), - ProcessSessionInformation, - &psi, sizeof psi, NULL); - if (!NT_SUCCESS (status) || psi.SessionId == 0) - dir = get_shared_parent_dir (); - else - { - WCHAR bnoname[MAX_PATH]; - __small_swprintf (bnoname, - L"\\Sessions\\BNOLINKS\\%d\\%s%s-%S", - psi.SessionId, cygwin_version.shared_id, - _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)); - status = NtCreateDirectoryObject (&dir, CYG_SHARED_DIR_ACCESS, &attr); - if (!NT_SUCCESS (status)) - api_fatal ("NtCreateDirectoryObject(%S): %p", &uname, status); - } - } - return dir; -} - -char * __stdcall -shared_name (char *ret_buf, const char *str, int num) -{ - __small_sprintf (ret_buf, "%s.%d", str, num); - return ret_buf; -} - -WCHAR * __stdcall -shared_name (WCHAR *ret_buf, const WCHAR *str, int num) -{ - __small_swprintf (ret_buf, L"%W.%d", str, num); - return ret_buf; -} - -#define page_const (65535) -#define pround(n) (((size_t) (n) + page_const) & ~page_const) - -static ptrdiff_t offsets[] = -{ - - pround (sizeof (shared_info)) - - pround (sizeof (user_info)) - - pround (sizeof (console_state)) - - pround (sizeof (_pinfo)), - - pround (sizeof (user_info)) - - pround (sizeof (console_state)) - - pround (sizeof (_pinfo)), - - pround (sizeof (console_state)) - - pround (sizeof (_pinfo)), - - pround (sizeof (_pinfo)), - 0 -}; - -#define off_addr(x) ((void *)((caddr_t) cygwin_hmodule + offsets[x])) - -void * __stdcall -open_shared (const WCHAR *name, int n, HANDLE& shared_h, DWORD size, - shared_locations m, PSECURITY_ATTRIBUTES psa, DWORD access) -{ - return open_shared (name, n, shared_h, size, &m, psa, access); -} - -void * __stdcall -open_shared (const WCHAR *name, int n, HANDLE& shared_h, DWORD size, - shared_locations *m, PSECURITY_ATTRIBUTES psa, DWORD access) -{ - void *shared; - - void *addr; - if (*m == SH_JUSTCREATE || *m == SH_JUSTOPEN) - addr = NULL; - else - { - addr = off_addr (*m); - VirtualFree (addr, 0, MEM_RELEASE); - } - - WCHAR map_buf[MAX_PATH]; - WCHAR *mapname = NULL; - - if (shared_h) - *m = SH_JUSTOPEN; - else - { - if (name) - mapname = shared_name (map_buf, name, n); - if (*m == SH_JUSTOPEN) - shared_h = OpenFileMappingW (access, FALSE, mapname); - else - { - shared_h = CreateFileMappingW (INVALID_HANDLE_VALUE, psa, - PAGE_READWRITE, 0, size, mapname); - if (GetLastError () == ERROR_ALREADY_EXISTS) - *m = SH_JUSTOPEN; - } - if (shared_h) - /* ok! */; - else if (*m != SH_JUSTOPEN) - api_fatal ("CreateFileMapping %W, %E. Terminating.", mapname); - else - return NULL; - } - - shared = (shared_info *) - MapViewOfFileEx (shared_h, access, 0, 0, 0, addr); - - if (!shared && addr) - { - shared = (shared_info *) MapViewOfFileEx (shared_h, - FILE_MAP_READ|FILE_MAP_WRITE, - 0, 0, 0, NULL); -#ifdef DEBUGGING - system_printf ("relocating shared object %W(%d) from %p to %p", name, n, addr, shared); -#endif - offsets[0] = 0; - } - - if (!shared) - api_fatal ("MapViewOfFileEx '%W'(%p), %E. Terminating.", mapname, shared_h); - - if (*m == SH_CYGWIN_SHARED && offsets[0]) - { - ptrdiff_t delta = (caddr_t) shared - (caddr_t) off_addr (0); - offsets[0] = (caddr_t) shared - (caddr_t) cygwin_hmodule; - for (int i = SH_USER_SHARED + 1; i < SH_TOTAL_SIZE; i++) - { - unsigned size = offsets[i + 1] - offsets[i]; - offsets[i] += delta; - if (!VirtualAlloc (off_addr (i), size, MEM_RESERVE, PAGE_NOACCESS)) - continue; /* oh well */ - } - offsets[SH_TOTAL_SIZE] += delta; - } - - debug_printf ("name %W, n %d, shared %p (wanted %p), h %p", mapname, n, shared, addr, shared_h); - - return shared; -} - -/* Second half of user shared initialization: Initialize content. */ -void -user_info::initialize () -{ - /* Wait for initialization of the Cygwin per-user shared, if necessary */ - spinlock sversion (version, CURR_USER_MAGIC); - if (!sversion) - { - cb = sizeof (*user_shared); - cygpsid sid (cygheap->user.sid ()); - struct passwd *pw = internal_getpwsid (sid); - /* Correct the user name with what's defined in /etc/passwd before - loading the user fstab file. */ - if (pw) - cygheap->user.set_name (pw->pw_name); - mountinfo.init (); /* Initialize the mount table. */ - } - else if (sversion != CURR_USER_MAGIC) - sversion.multiple_cygwin_problem ("user shared memory version", version, - sversion); - else if (user_shared->cb != sizeof (*user_shared)) - sversion.multiple_cygwin_problem ("user shared memory size", cb, - sizeof (*user_shared)); -} - -/* First half of user shared initialization: Create shared mem region. */ -void -user_info::create (bool reinit) -{ - WCHAR name[UNLEN + 1] = L""; /* Large enough for SID */ - - if (reinit) - { - if (!UnmapViewOfFile (user_shared)) - debug_printf("UnmapViewOfFile %E"); - if (!ForceCloseHandle (cygwin_user_h)) - debug_printf("CloseHandle %E"); - cygwin_user_h = NULL; - } - - if (!cygwin_user_h) - cygheap->user.get_windows_id (name); - - user_shared = (user_info *) open_shared (name, USER_VERSION, - cygwin_user_h, sizeof (user_info), - SH_USER_SHARED, &sec_none); - debug_printf ("opening user shared for '%W' at %p", name, user_shared); - ProtectHandleINH (cygwin_user_h); - debug_printf ("user shared version %x", user_shared->version); - if (reinit) - user_shared->initialize (); -} - -void __stdcall -shared_destroy () -{ - ForceCloseHandle (cygwin_shared_h); - UnmapViewOfFile (cygwin_shared); - ForceCloseHandle (cygwin_user_h); - UnmapViewOfFile (user_shared); -} - -/* Initialize obcaseinsensitive. Default to case insensitive on pre-XP. */ -void -shared_info::init_obcaseinsensitive () -{ - HKEY key; - DWORD size = sizeof (DWORD); - - obcaseinsensitive = 1; - if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, - "SYSTEM\\CurrentControlSet\\Control\\Session Manager\\kernel", - 0, KEY_READ, &key) == ERROR_SUCCESS) - { - RegQueryValueEx (key, "obcaseinsensitive", NULL, NULL, - (LPBYTE) &obcaseinsensitive, &size); - RegCloseKey (key); - } - debug_printf ("obcaseinsensitive set to %d", obcaseinsensitive); -} - -void inline -shared_info::create () -{ - cygwin_shared = (shared_info *) open_shared (L"shared", - CYGWIN_VERSION_SHARED_DATA, - cygwin_shared_h, - sizeof (*cygwin_shared), - SH_CYGWIN_SHARED); - cygwin_shared->initialize (); -} - -void -shared_info::initialize () -{ - spinlock sversion (version, CURR_SHARED_MAGIC); - if (!sversion) - { - cb = sizeof (*this); - get_session_parent_dir (); /* Create session dir if first process. */ - init_obcaseinsensitive (); /* Initialize obcaseinsensitive */ - tty.init (); /* Initialize tty table */ - mt.initialize (); /* Initialize shared tape information */ - /* 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); - } - else if (sversion != (LONG) CURR_SHARED_MAGIC) - sversion.multiple_cygwin_problem ("system shared memory version", - sversion, CURR_SHARED_MAGIC); - else if (cb != sizeof (*this)) - system_printf ("size of shared memory region changed from %u to %u", - sizeof (*this), cb); - heap_init (); -} - -void -memory_init (bool init_cygheap) -{ - getpagesize (); - - /* Initialize the Cygwin heap, if necessary */ - if (init_cygheap) - { - cygheap_init (); - cygheap->user.init (); - } - - init_installation_root (); /* Initialize installation root dir */ - shared_info::create (); /* Initialize global shared memory */ - user_info::create (false); /* Initialize per-user shared memory */ -} - -unsigned -shared_info::heap_slop_size () -{ - if (!heap_slop_inited) - { - /* Fetch from registry, first user then local machine. */ - for (int i = 0; i < 2; i++) - { - reg_key reg (i, KEY_READ, NULL); - - if ((heap_slop = reg.get_int ("heap_slop_in_mb", 0))) - break; - heap_slop = wincap.heapslop (); - } - heap_slop <<= 20; - heap_slop_inited = true; - } - - return heap_slop; -} - -unsigned -shared_info::heap_chunk_size () -{ - if (!heap_chunk) - { - /* Fetch from registry, first user then local machine. */ - for (int i = 0; i < 2; i++) - { - reg_key reg (i, KEY_READ, NULL); - - /* Note that reserving a huge amount of heap space does not result in - the use of swap since we are not committing it. */ - /* FIXME: We should not be restricted to a fixed size heap no matter - what the fixed size is. */ - - if ((heap_chunk = reg.get_int ("heap_chunk_in_mb", 0))) - break; - heap_chunk = 384; /* Default */ - } - - if (heap_chunk < 4) - heap_chunk = 4 * 1024 * 1024; - else - heap_chunk <<= 20; - if (!heap_chunk) - heap_chunk = 384 * 1024 * 1024; - } - - return heap_chunk; -} |