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* shared_info.h (user_info): Add dll_crt0_1 as a friend.

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(user_info::version): Make LONG to accommodate spinlock use.
(user_info::create): New static function renamed from user_info_create.
(user_info::initialize): New private function renamed from
user_info_initialize.
(SHARED_VERSION): Delete.
(SHARED_VERSION_MAGIC): Ditto.
(USER_VERSION_MAGIC): Ditto.
(SHARED_INFO_CB): Ditto.
(USER_VERSION): Ditto.
(USER_VERSION_MAGIC): Ditto.
(CURR_SHARED_MAGIC): Update.
(CURR_USER_MAGIC): Ditto.
(shared_info::version): Make LONG to accommodate spinlock use.
(shared_info::create): New static function mirroring user_info::create.
(dll_crt0_1): Accommodate change to user_info::initialize.
* spinlock.h (spinlock::setto): New variable member.
(spinlock::done): New function.
(spinlock::spinlock): Generalize to allow arbitrary values and timeouts.  Call
done() when lock is not needed.
* ntdll.h: Make multiple-inclusion safe.
(NtQuerySystemTime): Declare.
* shared.cc (installation_root_inited): Rename from shared_mem_inited.
(init_installation_root): Make inline.  Use a spinlock to ensure that this is
initialized only once per session.
(user_info::initialize): Rename from user_shared_initialize.  Protect with
spinlock on sversion and remove other spinlock-like things.  Remove reference
to user_shared since it is now implicit.  Refer to spinlock version of
multiple_cygwin_problem to ensure that any spinlock is released.
(user_info::create): Rename from user_shared_create.  Accommodate change from
user_shared_initialize to user_info::initialize.
(shared_info::create): New inline function.
(shared_info::initialize): Protect with spinlock on sversion.  Move heap_init
back under specific control of shared_info spinlock.  Remove reference to
SHARED_INFO_CB and just use sizeof(*this).
(memory_init): Move all locking into respective functions where it is needed.
Accommodate name changes.  Remove call to heap_init().
* syscalls.cc (seteuid32): Accommodate name change to user_info::create().
* mount.cc (mount_info::create_root_entry): Report on errors from add_item
since they should be nonexistent.
(mount_info::init): Don't initialize nmounts.  It should already be zero.  Give
more verbose error when root_idx < 0.  Implicitly use this pointer rather than
explicitly referencing mount_table->.
(mount_info::add_item): Minor whitespace fix.
This commit is contained in:
Christopher Faylor
2010-03-15 21:29:15 +00:00
parent 654e623ce0
commit cef5dfd75a
8 changed files with 219 additions and 129 deletions
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178
winsup/cygwin/shared.cc
View File

@ -24,7 +24,6 @@ details. */
#include "cygwin_version.h"
#include "pwdgrp.h"
#include "spinlock.h"
#include "ntdll.h"
#include <alloca.h>
#include <wchar.h>
#include <wingdi.h>
@ -38,7 +37,9 @@ 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 shared_mem_inited __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
@ -63,58 +64,61 @@ static LONG shared_mem_inited __attribute__((section (".cygwin_dll_common"), sha
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
void inline
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 (!spinlock (installation_root_inited))
{
if (!wcsncasecmp (p, L"\\\\", 2)) /* UNC */
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. */
{
p = wcpcpy (p, L"\\??\\UN");
GetModuleFileNameW (cygwin_hmodule, p, PATH_MAX - 6);
*p = L'C';
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);
}
}
else
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)
{
p = wcpcpy (p, L"\\??\\");
GetModuleFileNameW (cygwin_hmodule, p, PATH_MAX - 4);
*w = L'\0';
w = wcsrchr (installation_root, L'\\');
}
}
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)
{
if (!w)
api_fatal ("Can't initialize Cygwin installation root dir.\n"
"Invalid DLL path");
*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;
}
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';
if (cygwin_props.disable_key)
{
installation_key.Length = 0;
installation_key.Buffer[0] = L'\0';
}
}
}
@ -301,35 +305,32 @@ open_shared (const WCHAR *name, int n, HANDLE& shared_h, DWORD size,
/* Second half of user shared initialization: Initialize content. */
void
user_shared_initialize ()
user_info::initialize ()
{
DWORD sversion = (DWORD) InterlockedExchange ((LONG *) &user_shared->version, USER_VERSION_MAGIC);
/* 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);
user_shared->mountinfo.init (); /* Initialize the mount table. */
user_shared->cb = sizeof (*user_shared);
}
else
{
while (!user_shared->cb)
yield (); // 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));
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_shared_create (bool reinit)
user_info::create (bool reinit)
{
WCHAR name[UNLEN + 1] = L""; /* Large enough for SID */
@ -352,7 +353,7 @@ user_shared_create (bool reinit)
ProtectHandleINH (cygwin_user_h);
debug_printf ("user shared version %x", user_shared->version);
if (reinit)
user_shared_initialize ();
user_shared->initialize ();
}
void __stdcall
@ -383,10 +384,21 @@ shared_info::init_obcaseinsensitive ()
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 ()
{
DWORD sversion = (DWORD) InterlockedExchange ((LONG *) &version, SHARED_VERSION_MAGIC);
spinlock sversion (version, CURR_SHARED_MAGIC);
if (!sversion)
{
cb = sizeof (*this);
@ -394,16 +406,19 @@ shared_info::initialize ()
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 != SHARED_VERSION_MAGIC)
{
InterlockedExchange ((LONG *) &version, sversion);
multiple_cygwin_problem ("system shared memory version", sversion, SHARED_VERSION_MAGIC);
}
if (cb != SHARED_INFO_CB)
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",
SHARED_INFO_CB, cb);
sizeof (*this), cb);
heap_init ();
}
void
@ -418,30 +433,9 @@ memory_init (bool init_cygheap)
cygheap->user.init ();
}
/* Initialize general shared memory under spinlock control */
{
spinlock smi (shared_mem_inited, 10000);
if (!smi)
init_installation_root (); /* Initialize installation root dir */
cygwin_shared = (shared_info *) open_shared (L"shared",
CYGWIN_VERSION_SHARED_DATA,
cygwin_shared_h,
sizeof (*cygwin_shared),
SH_CYGWIN_SHARED);
heap_init ();
if (!smi)
{
cygwin_shared->initialize ();
/* 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);
}
}
user_shared_create (false);
init_installation_root (); /* Initialize installation root dir */
shared_info::create (); /* Initialize global shared memory */
user_info::create (false); /* Initialize per-user shared memory */
}
unsigned