370 lines
9.8 KiB
C++
370 lines
9.8 KiB
C++
/* 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 "ntdll.h"
|
|
#include <alloca.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;
|
|
}
|
|
|
|
void
|
|
user_shared_initialize (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);
|
|
|
|
DWORD sversion = (DWORD) InterlockedExchange ((LONG *) &user_shared->version, USER_VERSION_MAGIC);
|
|
/* Initialize the Cygwin per-user shared, if necessary */
|
|
if (!sversion)
|
|
{
|
|
debug_printf ("initializing user shared");
|
|
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));
|
|
}
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
|
|
tty.init (); /* Initialize tty table. */
|
|
mt.initialize (); /* Initialize shared tape information. */
|
|
init_obcaseinsensitive ();/* Initialize obcaseinsensitive. */
|
|
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 = SH_CYGWIN_SHARED;
|
|
cygwin_shared = (shared_info *) open_shared ("shared",
|
|
CYGWIN_VERSION_SHARED_DATA,
|
|
cygwin_shared_h,
|
|
sizeof (*cygwin_shared),
|
|
sh_cygwin_shared);
|
|
|
|
cygwin_shared->initialize ();
|
|
|
|
user_shared_initialize (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;
|
|
}
|