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newlib-cygwin/winsup/cygwin/shared.cc

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/* shared.cc: shared data area support.
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002 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 <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <grp.h>
#include <pwd.h>
#include "pinfo.h"
#include "security.h"
#include "fhandler.h"
#include "path.h"
#include "dtable.h"
#include "cygerrno.h"
#include "cygheap.h"
#include "heap.h"
#include "shared_info_magic.h"
#include "registry.h"
#include "cygwin_version.h"
#include "child_info.h"
shared_info NO_COPY *cygwin_shared;
mount_info NO_COPY *mount_table;
HANDLE NO_COPY cygwin_mount_h;
char * __stdcall
shared_name (char *ret_buf, const char *str, int num)
{
extern bool _cygwin_testing;
__small_sprintf (ret_buf, "%s%s.%s.%d",
wincap.has_terminal_services () ? "Global\\" : "",
cygwin_version.shared_id, str, num);
if (_cygwin_testing)
strcat (ret_buf, cygwin_version.dll_build_date);
return ret_buf;
}
#define page_const (65535)
#define pround(n) (((size_t) (n) + page_const) & ~page_const)
static char *offsets[] =
{
(char *) cygwin_shared_address,
(char *) cygwin_shared_address
+ pround (sizeof (shared_info)),
(char *) cygwin_shared_address
+ pround (sizeof (shared_info))
+ pround (sizeof (mount_info)),
(char *) cygwin_shared_address
+ pround (sizeof (shared_info))
+ pround (sizeof (mount_info))
+ pround (sizeof (console_state)),
(char *) cygwin_shared_address
+ pround (sizeof (shared_info))
+ pround (sizeof (mount_info))
+ pround (sizeof (console_state))
+ pround (sizeof (_pinfo))
};
void * __stdcall
open_shared (const char *name, int n, HANDLE &shared_h, DWORD size,
shared_locations m, PSECURITY_ATTRIBUTES psa)
{
void *shared;
void *addr;
if (!wincap.needs_memory_protection ())
addr = NULL;
else
{
addr = offsets[m];
(void) VirtualFree (addr, 0, MEM_RELEASE);
}
if (!size)
return addr;
if (!shared_h)
{
char *mapname;
char map_buf[MAX_PATH];
if (!name)
mapname = NULL;
else
{
mapname = shared_name (map_buf, name, n);
shared_h = OpenFileMappingA (FILE_MAP_READ | FILE_MAP_WRITE,
TRUE, mapname);
}
if (!shared_h &&
!(shared_h = CreateFileMapping (INVALID_HANDLE_VALUE, psa,
PAGE_READWRITE, 0, size, mapname)))
api_fatal ("CreateFileMapping, %E. Terminating.");
}
shared = (shared_info *)
MapViewOfFileEx (shared_h, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, 0, addr);
if (!shared)
{
/* Probably win95, so try without specifying the address. */
shared = (shared_info *) MapViewOfFileEx (shared_h,
FILE_MAP_READ|FILE_MAP_WRITE,
0, 0, 0, 0);
#ifdef DEBUGGING
if (wincap.is_winnt ())
system_printf ("relocating shared object %s(%d) from %p to %p on Windows NT", name, n, addr, shared);
#endif
}
if (!shared)
api_fatal ("MapViewOfFileEx '%s'(%p), %E. Terminating.", name, shared_h);
if (m == SH_CYGWIN_SHARED && wincap.needs_memory_protection ())
{
unsigned delta = (char *) shared - offsets[0];
offsets[0] = (char *) shared;
for (int i = SH_CYGWIN_SHARED + 1; i < SH_TOTAL_SIZE; i++)
{
unsigned size = offsets[i + 1] - offsets[i];
offsets[i] += delta;
if (!VirtualAlloc (offsets[i], size, MEM_RESERVE, PAGE_NOACCESS))
continue; /* oh well */
}
offsets[SH_TOTAL_SIZE] += delta;
#if 0
if (!child_proc_info && wincap.needs_memory_protection ())
for (DWORD s = 0x950000; s <= 0xa40000; s += 0x1000)
VirtualAlloc ((void *) s, 4, MEM_RESERVE, PAGE_NOACCESS);
#endif
}
debug_printf ("name %s, shared %p (wanted %p), h %p", name, shared, addr, shared_h);
return shared;
}
void
user_shared_initialize ()
{
char name[UNLEN + 1] = "";
/* Temporary code. Will be cleaned up later */
if (wincap.has_security ())
{
HANDLE ptok = NULL;
DWORD siz;
cygsid tu;
if (cygwin_mount_h) /* Reinit */
tu = cygheap->user.sid ();
else
{
if (!OpenProcessToken (hMainProc, TOKEN_ADJUST_DEFAULT | TOKEN_QUERY,
&ptok))
system_printf ("OpenProcessToken(): %E");
else if (!GetTokenInformation (ptok, TokenUser, &tu, sizeof tu, &siz))
system_printf ("GetTokenInformation (TokenUser): %E");
else
tu.string (name);
if (ptok)
CloseHandle (ptok);
}
tu.string (name);
}
else
strcpy (name, cygheap->user.name ());
if (cygwin_mount_h)
{
if (!UnmapViewOfFile (mount_table))
debug_printf("UnmapViewOfFile %E");
if (!ForceCloseHandle (cygwin_mount_h))
debug_printf("CloseHandle %E");
cygwin_mount_h = NULL;
}
mount_table = (mount_info *) open_shared (name, MOUNT_VERSION,
cygwin_mount_h, sizeof (mount_info),
SH_MOUNT_TABLE, &sec_none);
debug_printf ("opening mount table for '%s' at %p", name,
mount_table);
ProtectHandleINH (cygwin_mount_h);
debug_printf ("mount table version %x at %p", mount_table->version, mount_table);
/* Initialize the Cygwin per-user mount table, if necessary */
if (!mount_table->version)
{
mount_table->version = MOUNT_VERSION_MAGIC;
debug_printf ("initializing mount table");
mount_table->cb = sizeof (*mount_table);
if (mount_table->cb != MOUNT_INFO_CB)
system_printf ("size of mount table region changed from %u to %u",
MOUNT_INFO_CB, mount_table->cb);
mount_table->init (); /* Initialize the mount table. */
}
else if (mount_table->version != MOUNT_VERSION_MAGIC)
multiple_cygwin_problem ("mount", mount_table->version, MOUNT_VERSION);
else if (mount_table->cb != MOUNT_INFO_CB)
multiple_cygwin_problem ("mount table size", mount_table->cb, MOUNT_INFO_CB);
}
void
shared_info::initialize (const char *user_name)
{
DWORD sversion = (DWORD) InterlockedExchange ((LONG *) &version, SHARED_VERSION_MAGIC);
if (!sversion)
{
/* Initialize the queue of deleted files. */
delqueue.init ();
/* Initialize tty table. */
tty.init ();
}
else
{
if (version != SHARED_VERSION_MAGIC)
{
multiple_cygwin_problem ("shared", version, SHARED_VERSION_MAGIC);
InterlockedExchange ((LONG *) &version, sversion);
}
while (!cb)
low_priority_sleep (0); // Should be hit only very very rarely
}
/* Initialize the Cygwin heap, if necessary */
if (!cygheap)
{
cygheap_init ();
cygheap->user.set_name (user_name);
}
heap_init ();
if (!sversion)
cb = sizeof (*this); // Do last, after all shared memory initializion
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 ();
char user_name[UNLEN + 1];
DWORD user_name_len = UNLEN + 1;
if (!GetUserName (user_name, &user_name_len))
strcpy (user_name, "unknown");
/* Initialize general shared memory */
HANDLE shared_h = cygheap ? cygheap->shared_h : NULL;
cygwin_shared = (shared_info *) open_shared ("shared",
CYGWIN_VERSION_SHARED_DATA,
shared_h,
sizeof (*cygwin_shared),
SH_CYGWIN_SHARED);
cygwin_shared->initialize (user_name);
cygheap->shared_h = shared_h;
ProtectHandleINH (cygheap->shared_h);
user_shared_initialize ();
}
unsigned
shared_info::heap_chunk_size ()
{
if (!heap_chunk)
{
/* Fetch misc. registry entries. */
reg_key reg (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. */
heap_chunk = reg.get_int ("heap_chunk_in_mb", 0);
if (!heap_chunk) {
reg_key r1 (HKEY_LOCAL_MACHINE, KEY_READ, "SOFTWARE",
CYGWIN_INFO_CYGNUS_REGISTRY_NAME,
CYGWIN_INFO_CYGWIN_REGISTRY_NAME, NULL);
heap_chunk = r1.get_int ("heap_chunk_in_mb", 384);
}
if (heap_chunk < 4)
heap_chunk = 4 * 1024 * 1024;
else
heap_chunk <<= 20;
if (!heap_chunk)
heap_chunk = 384 * 1024 * 1024;
debug_printf ("fixed heap size is %u", heap_chunk);
}
return heap_chunk;
}
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