diff options
Diffstat (limited to 'winsup/cygwin/shared.cc')
| -rw-r--r-- | winsup/cygwin/shared.cc | 431 |
1 files changed, 0 insertions, 431 deletions
diff --git a/winsup/cygwin/shared.cc b/winsup/cygwin/shared.cc deleted file mode 100644 index 505c4e3d0..000000000 --- a/winsup/cygwin/shared.cc +++ /dev/null @@ -1,431 +0,0 @@ -/* shared.cc: shared data area support. - - Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, - 2006, 2007, 2008 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 "ntdll.h" -#include <alloca.h> -#include <wchar.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; - -/* This function returns a handle to the top-level directory in the global - NT namespace used to implement global objects including shared memory. */ -extern bool _cygwin_testing; - -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", - cygwin_version.shared_id, - _cygwin_testing ? cygwin_version.dll_build_date : ""); - 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 (GetCurrentProcess (), - 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", - psi.SessionId, cygwin_version.shared_id, - _cygwin_testing ? cygwin_version.dll_build_date : ""); - 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; -} - -#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 char *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); - } - - char map_buf[MAX_PATH]; - char *mapname = NULL; - - if (shared_h) - m = SH_JUSTOPEN; - else - { - if (name) - mapname = shared_name (map_buf, name, n); - if (m == SH_JUSTOPEN) - shared_h = OpenFileMapping (access, FALSE, mapname); - else - { - shared_h = CreateFileMapping (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 %s, %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 %s(%d) from %p to %p", name, n, addr, shared); -#endif - offsets[0] = 0; - } - - if (!shared) - api_fatal ("MapViewOfFileEx '%s'(%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 %s, 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_shared_initialize () -{ - DWORD sversion = (DWORD) InterlockedExchange ((LONG *) &user_shared->version, USER_VERSION_MAGIC); - /* Wait for initialization of the Cygwin per-user shared, if necessary */ - if (!sversion) - { - 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); - user_shared->mountinfo.init (); /* Initialize the mount table. */ - user_shared->cb = sizeof (*user_shared); - } - else - { - while (!user_shared->cb) - low_priority_sleep (0); // Should be hit only very very rarely - if (user_shared->version != sversion) - multiple_cygwin_problem ("user shared memory version", user_shared->version, sversion); - else if (user_shared->cb != sizeof (*user_shared)) - multiple_cygwin_problem ("user shared memory size", user_shared->cb, sizeof (*user_shared)); - } -} - -/* First half of user shared initialization: Create shared mem region. */ -void -user_shared_create (bool reinit) -{ - char name[UNLEN + 1] = ""; /* 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); - - shared_locations sh_user_shared = SH_USER_SHARED; - 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 '%s' 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); -} - -/* 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 () -{ - 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 -shared_info::initialize () -{ - DWORD sversion = (DWORD) InterlockedExchange ((LONG *) &version, SHARED_VERSION_MAGIC); - if (sversion) - { - if (sversion != SHARED_VERSION_MAGIC) - { - InterlockedExchange ((LONG *) &version, sversion); - multiple_cygwin_problem ("system shared memory version", sversion, SHARED_VERSION_MAGIC); - } - while (!cb) - low_priority_sleep (0); // Should be hit only very very rarely - } - - heap_init (); - get_session_parent_dir (); /* Create session dir if first process. */ - - if (!sversion) - { - init_installation_root ();/* Initialize installation root dir. */ - init_obcaseinsensitive ();/* Initialize obcaseinsensitive. */ - tty.init (); /* Initialize tty table. */ - mt.initialize (); /* Initialize shared tape information. */ - cb = sizeof (*this); /* Do last, after all shared memory initialization */ - } - - if (cb != SHARED_INFO_CB) - system_printf ("size of shared memory region changed from %u to %u", - SHARED_INFO_CB, cb); -} - -void __stdcall -memory_init () -{ - getpagesize (); - - /* Initialize the Cygwin heap, if necessary */ - if (!cygheap) - { - cygheap_init (); - cygheap->user.init (); - } - - /* Initialize general shared memory */ - shared_locations sh_cygwin_shared; - cygwin_shared = (shared_info *) open_shared ("shared", - CYGWIN_VERSION_SHARED_DATA, - cygwin_shared_h, - sizeof (*cygwin_shared), - sh_cygwin_shared = SH_CYGWIN_SHARED); - cygwin_shared->initialize (); - user_shared_create (false); -} - -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; -} |