275 lines
7.3 KiB
C++
275 lines
7.3 KiB
C++
/* shared.cc: shared data area support.
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Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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2006 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <grp.h>
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#include <pwd.h>
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#include "cygerrno.h"
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#include "pinfo.h"
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#include "security.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "heap.h"
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#include "shared_info_magic.h"
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#include "registry.h"
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#include "cygwin_version.h"
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#include "child_info.h"
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#include "mtinfo.h"
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static shared_info cygwin_shared_area __attribute__((section (".cygwin_dll_common"), shared));
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shared_info NO_COPY *cygwin_shared;
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user_info NO_COPY *user_shared;
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HANDLE NO_COPY cygwin_user_h;
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char * __stdcall
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shared_name (char *ret_buf, const char *str, int num)
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{
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extern bool _cygwin_testing;
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__small_sprintf (ret_buf, "%s%s.%s.%d", cygheap->shared_prefix,
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cygwin_version.shared_id, str, num);
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if (_cygwin_testing)
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strcat (ret_buf, cygwin_version.dll_build_date);
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return ret_buf;
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}
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#define page_const (65535)
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#define pround(n) (((size_t) (n) + page_const) & ~page_const)
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static char *offsets[] =
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{
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(char *) cygwin_shared_address
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- pround (sizeof (user_info))
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- pround (sizeof (console_state))
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- pround (sizeof (_pinfo)),
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(char *) cygwin_shared_address
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- pround (sizeof (console_state))
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- pround (sizeof (_pinfo)),
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(char *) cygwin_shared_address
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- pround (sizeof (_pinfo)),
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(char *) cygwin_shared_address
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};
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void * __stdcall
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open_shared (const char *name, int n, HANDLE& shared_h, DWORD size,
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shared_locations& m, PSECURITY_ATTRIBUTES psa, DWORD access)
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{
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void *shared;
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void *addr;
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if ((m == SH_JUSTCREATE || m == SH_JUSTOPEN)
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|| !wincap.needs_memory_protection () && offsets[0])
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addr = NULL;
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else
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{
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addr = offsets[m];
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VirtualFree (addr, 0, MEM_RELEASE);
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}
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char map_buf[CYG_MAX_PATH];
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char *mapname = NULL;
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if (shared_h)
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m = SH_JUSTOPEN;
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else
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{
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if (name)
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mapname = shared_name (map_buf, name, n);
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if (m == SH_JUSTOPEN)
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shared_h = OpenFileMapping (access, FALSE, mapname);
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else
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{
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shared_h = CreateFileMapping (INVALID_HANDLE_VALUE, psa, PAGE_READWRITE,
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0, size, mapname);
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if (GetLastError () == ERROR_ALREADY_EXISTS)
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m = SH_JUSTOPEN;
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}
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if (shared_h)
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/* ok! */;
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else if (m != SH_JUSTOPEN)
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api_fatal ("CreateFileMapping %s, %E. Terminating.", mapname);
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else
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return NULL;
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}
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shared = (shared_info *)
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MapViewOfFileEx (shared_h, access, 0, 0, 0, addr);
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if (!shared && addr)
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{
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/* Probably win95, so try without specifying the address. */
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shared = (shared_info *) MapViewOfFileEx (shared_h,
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FILE_MAP_READ|FILE_MAP_WRITE,
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0, 0, 0, NULL);
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#ifdef DEBUGGING
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if (wincap.is_winnt ())
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system_printf ("relocating shared object %s(%d) from %p to %p on Windows NT", name, n, addr, shared);
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#endif
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offsets[0] = NULL;
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}
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if (!shared)
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api_fatal ("MapViewOfFileEx '%s'(%p), %E. Terminating.", mapname, shared_h);
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if (m == SH_USER_SHARED && offsets[0] && wincap.needs_memory_protection ())
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{
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unsigned delta = (char *) shared - offsets[0];
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offsets[0] = (char *) shared;
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for (int i = SH_USER_SHARED + 1; i < SH_TOTAL_SIZE; i++)
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{
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unsigned size = offsets[i + 1] - offsets[i];
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offsets[i] += delta;
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if (!VirtualAlloc (offsets[i], size, MEM_RESERVE, PAGE_NOACCESS))
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continue; /* oh well */
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}
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offsets[SH_TOTAL_SIZE] += delta;
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#if 0
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if (!child_proc_info && wincap.needs_memory_protection ())
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for (DWORD s = 0x950000; s <= 0xa40000; s += 0x1000)
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VirtualAlloc ((void *) s, 4, MEM_RESERVE, PAGE_NOACCESS);
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#endif
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}
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debug_printf ("name %s, n %d, shared %p (wanted %p), h %p", mapname, n, shared, addr, shared_h);
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return shared;
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}
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void
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user_shared_initialize (bool reinit)
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{
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char name[UNLEN + 1] = ""; /* Large enough for SID */
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if (reinit)
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{
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if (!UnmapViewOfFile (user_shared))
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debug_printf("UnmapViewOfFile %E");
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if (!ForceCloseHandle (cygwin_user_h))
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debug_printf("CloseHandle %E");
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cygwin_user_h = NULL;
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}
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if (!cygwin_user_h)
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cygheap->user.get_windows_id (name);
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shared_locations sh_user_shared = SH_USER_SHARED;
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user_shared = (user_info *) open_shared (name, USER_VERSION,
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cygwin_user_h, sizeof (user_info),
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sh_user_shared, &sec_none);
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debug_printf ("opening user shared for '%s' at %p", name, user_shared);
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ProtectHandleINH (cygwin_user_h);
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debug_printf ("user shared version %x", user_shared->version);
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DWORD sversion = (DWORD) InterlockedExchange ((LONG *) &user_shared->version, USER_VERSION_MAGIC);
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/* Initialize the Cygwin per-user shared, if necessary */
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if (!sversion)
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{
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debug_printf ("initializing user shared");
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user_shared->mountinfo.init (); /* Initialize the mount table. */
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user_shared->delqueue.init (); /* Initialize the queue of deleted files. */
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user_shared->cb = sizeof (*user_shared);
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}
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else
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{
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while (!user_shared->cb)
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low_priority_sleep (0); // Should be hit only very very rarely
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if (user_shared->version != sversion)
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multiple_cygwin_problem ("user shared memory version", user_shared->version, sversion);
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else if (user_shared->cb != sizeof (*user_shared))
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multiple_cygwin_problem ("user shared memory size", user_shared->cb, sizeof (*user_shared));
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}
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}
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void
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shared_info::initialize ()
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{
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DWORD sversion = (DWORD) InterlockedExchange ((LONG *) &version, SHARED_VERSION_MAGIC);
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if (sversion)
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{
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if (sversion != SHARED_VERSION_MAGIC)
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{
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InterlockedExchange ((LONG *) &version, sversion);
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multiple_cygwin_problem ("system shared memory version", sversion, SHARED_VERSION_MAGIC);
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}
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while (!cb)
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low_priority_sleep (0); // Should be hit only very very rarely
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}
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heap_init ();
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if (!sversion)
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{
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tty.init (); /* Initialize tty table. */
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cb = sizeof (*this); /* Do last, after all shared memory initialization */
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}
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if (cb != SHARED_INFO_CB)
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system_printf ("size of shared memory region changed from %u to %u",
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SHARED_INFO_CB, cb);
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}
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void __stdcall
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memory_init ()
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{
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getpagesize ();
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/* Initialize the Cygwin heap, if necessary */
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if (!cygheap)
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{
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cygheap_init ();
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cygheap->user.init ();
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}
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cygwin_shared = &cygwin_shared_area;
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cygwin_shared->initialize ();
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user_shared_initialize (false);
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mtinfo_init ();
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}
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unsigned
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shared_info::heap_chunk_size ()
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{
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if (!heap_chunk)
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{
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/* Fetch from registry, first user then local machine. */
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for (int i = 0; i < 2; i++)
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{
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reg_key reg (i, KEY_READ, NULL);
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/* Note that reserving a huge amount of heap space does not result in
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the use of swap since we are not committing it. */
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/* FIXME: We should not be restricted to a fixed size heap no matter
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what the fixed size is. */
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if ((heap_chunk = reg.get_int ("heap_chunk_in_mb", 0)))
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break;
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heap_chunk = 384; /* Default */
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}
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if (heap_chunk < 4)
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heap_chunk = 4 * 1024 * 1024;
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else
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heap_chunk <<= 20;
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if (!heap_chunk)
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heap_chunk = 384 * 1024 * 1024;
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debug_printf ("fixed heap size is %u", heap_chunk);
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}
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return heap_chunk;
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}
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