newlib/winsup/cygserver/shm.cc

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2002-02-28 Robert Collins <rbtcollins@hotmail.com> * Merged cygwin_daemon into head minus the new shm and ipc exports. 2002-02-28 Robert Collins <rbtcollins@hotmail.com> * fhandler_tty.cc (fhandler_tty_slave::open): More debugging. (fhandler_tty_slave::read): Fix printf type for the handle. * tty.cc (tty::common_init): Add a FIXME for security. 2002-01-29 Robert Collins <rbtcollins@hotmail.com> * Makefile.in (OBJS): Remove duplicate localtime.o. 2002-01-17 Robert Collins <rbtcollins@hotmail.com> * cygserver.cc (check_and_dup_handle): Consolidate the two variants for simplicity. Add Some basic debug output. (client_request_attach_tty::serve): Use the new debug_printf for clarity. Mark the duplicated handles as inheritable - fixup_after_fork() doesn't reopen tty's. 2002-01-16 Robert Collins <rbtcollins@hotmail.com> * cygserver.cc (transport): Correct scope. (client_request_attach_tty::serve): Add more debug information. Fix erroneous use of transport instead of conn. * cygserver_transport_pipes.cc (transport_layer_pipes::close): More debug. (transport_layer_pipes::read): Ditto. (transport_layer_pipes::write): Ditto. (transport_layer_pipes::impersonate_client): Ditto. Mon Oct 8 7:41:00 2001 Robert Collins <rbtcollins@hotmail.com> * cygserver.cc (server_request::process): Rename client_request_shm_get to client_request_shm. * cygserver_process.cc (process_cache::add): Rename to add_task. Use process_cleanup instead of process_request. (process_cache::remove_process): New method. (process::process): Initialize new members. (process::~process): New member. (process::cleanup): New method. (process::add_cleanup_routine): New method. (process_request::process): Rename to process_cleanup. Call the process object's cleanup method and then delete it. (process_process_param::request_loop): Remove the signalling process. * cygserver_shm.cc: Globally rename client_request_shm_get to client_request_shm. (client_request_shm_get::serve): Handle attach request counting. * cygserver_shm.h: Globally rename client_request_shm_get to client_request_shm. (class shm_cleanup): New class. * shm.cc: Globally rename client_request_shm_get to client_request_shm. (client_request_shm::client_request_shm): New constructor for attach requests. (shmat): Use it. * include/cygwin/cygserver_process.h (class process_request): Rename to process_cleanup. (class cleanup_routine): New class. (class process): New members and methods to allow calling back when the process terminates. Thu Oct 4 14:12:00 2001 Robert Collins <rbtcollins@hotmail.com> * cygserver.cc (request_loop): Make static. (main): Use new cache constructor syntax. Start cache worker threads. Cleanup the cache at shutdown. * cygserver_process.cc: Run indent. (process_cache::process_cache): Add a trigger to use when adding a process. (process_cache::process): Move process_entry to process. Insert at the end of the list. Trigger the request loop when new process's inserted. (process_cache::process_requests): Do it. (process_cache::add): New method. (process_cache::handle_snapshot): New method. (process::process): Merge in the process_entry fields. (process::handle): Make a stub function. (process::exit_code): New method. (process_request::process): New method. (process_process_param::request_loop): New method. * cygserver_shm.cc: New header dependency - threaded_queue.h. * threaded_queue.cc (threaded_queue::cleanup): Clearer messages. (queue_process_param::stop): Short spinlock on interruptible threads. * threaded_queue.h (class threaded_queue): New constructor. * include/cygwin/cygserver_process.h (process_request): New class. (process_entry): Remove. (process): Merge in process_entry. (process_cache): Inherit from threaded_queue. Tue Oct 2 23:24:00 2001 Robert Collins <rbtcollins@hotmail.com> * cygserver.cc (class server_process_param): Use new constructor syntax. * cygserver_process.cc (process_cache::~process_cache): New function. * threaded_queue.cc: Define condition debug_printf. Run indent. (threaded_queue::cleanup): Move queue_process_param guts to a method. (threaded_queue::process_requests): Ditto. (queue_process_param::queue_process_param): New method. (queue_process_param::~queue_process_param): Ditto. (queue_process_param::start): Ditto. (queue_process_param::stop): Ditto. * threaded_queue.h (class queue_process_param): Add support for interruptible request loops. * cygwin/include/cygwin/cygserver_process.h (class process_cache): Add destructor. Tue Oct 2 23:24:00 2001 Robert Collins <rbtcollins@hotmail.com> * cygserver_client.cc: New flag allow_daemon to disable the daemon completely. (cygserver_request): Check it. (cygserver_init): Ditto. * environ.cc (parse_thing): Add (no)daemon option. Tue Oct 2 23:00:00 2001 Robert Collins <rbtcollins@hotmail.com> * shm.cc: Update to handle include changes from HEAD. Tue Oct 2 16:06:00 2001 Robert Collins <rbtcollins@hotmail.com> * Makefile.in: Remove cygserver_shm.o from cygwin1.dll. Rename cygserver_shm_outside.o to cygserver_shm.o. * cygserver.cc (server_request::process): Use the new client_request constructor. * cygserver_client.cc: Remove the #ifdef's stubs for the server method within cygwin. (client_request_attach_tty::client_request_attach_tty): Use the new client_request constructor. (client_request_shutdown::client_request_shutdown): Ditto. (client_request::client_request): Ditto. * cygserver_shm.cc (client_request_shm_get::serve): Remove the #ifdef'd stub for in-cygwin builds. (client_request_shm_get::client_request_shm_get): Use the new client_request constructor, and remove the in-cygwin variants. * cygserver_shm.h (class client_request_shm_get): #ifndef test the serve method - it's only used in cygserver. * shm.cc (client_request_shm_get::client_request_shm_get): New function. * include/cygwin/cygserver.h (request_header): New constructor. (class client_request): Use it. New constructor accepting the header size. #ifndef test the server method - it's only used within cygserver. (client_request_get_version): #ifdef test the server method. (client_request_shutdown): Ditto. (client_request_attach_tty): Ditto. Tue Oct 2 9:57:00 2001 Robert Collins <rbtcollins@hotmail.com> * Makefile.in: add threaded_queue.o to cygserver.exe. * cygserver.cc: Include threaded_queue.h (class server_request): Inherit from queue_request. (class server_process_param): Inherit from queue_process_param. (class server_request_queue): Inherit from threaded_queue. (request_loop): Adjust for new types. (server_request_queue::process_requests): Remove guts to threaded_queue::process_requests. (server_request::server_request): Adjust for new types. (worker_function): Delete. (server_request_queue::create_workers): Delete. (server_request_queue::cleanup): Delete. (server_request_queue::add): Move guts to threaded_queue::add. * threaded_queue.cc: New file. * threaded_queue.h: New file. Mon Oct 1 12:38:00 2001 Robert Collins <rbtcollins@hotmail.com> * cygserver.cc (client_request::serve): New function. * cygserver_process.cc: Inlude <pthread.h> for pthread_once. (process_cache::process_cache): Initialise a crtiical section for write access. (process_cache::process): Use the critical section. Also add missing entries to the cache. (do_process_init): New function to initalise class process static variables. (process::process): Ensure that the process access critical section is initialised. (process::handle): Close the handle of old process's when they have terminated and we are returning the handle for a process with the same pid. * cygserver_shm.cc: Run indent. Include cygserver_process.h to allow process cache functionality. (client_request_shm_get::serve): New parameter for process cache support. Use the process cache, not OpenProcess to get a handle to the originating process. Fix a handle leak with token_handle. * cygserver_shm.h (class client_request_shm_get): Update ::serve for process cache support. * cygserver_transport_pipes.cc: Redefine debug_printf to be conditional on DEBUG. * include/cygwin/cygserver.h: Do not implement client_request::serve in the header. * include/cygwin/cygserver_process.h (class process_cache): Add a write access critical section to prevent races when requests from a multithreaded application arrive. Sun Sep 30 23:41:00 2001 Robert Collins <rbtcollins@hotmail.com> * Makefile.in: Add cygserver_process.o to cygserver.exe. * cygserver.cc: Include signal.h and cygwin_version.h. Define debug_printf as a macro. Define DEBUG to a value. (client_request_attach_tty::serve): Add beginning of process cache support. Change from #ifdef DEBUG to work with new DEBUG style. (client_request_get_version::serve): Add beginning of process cache support. (class server_request): New prototype for support of process cache. (class queue_process_param): New class to allow request loop threading. (class server_request_queue): Add beginning of process cache support. Allow request loop threading. (request_loop): Thread function for request loops. (server_request_queue::process_requests): Initiator for threaded request loops. (client_request_shutdown::serve): Add beginning of process cache support. (server_request::server_request): Ditto. (server_request::process): Use debug_printf. Add beginning of process cache support. (server_request_queue::cleanup): Kill off any request loop threads. (server_request_queue::add): Add beginning of process cache support. (handle_signal): Trigger a shutdown. (main): Print out some useful info at startup - version, date time. Add process cache support. Spawn a separate thread for the transport request loop, thus allowing concurrent support for multiple transports. * cygserver_client.cc (client_request_get_version::serve): Add process cache support. (client_request_attach_tty::serve): Add process cache support. (client_request_shutdown::serve): Add process cache support. * cygsserver_process.cc: New file with the process cache support. * cygserver_shm.cc: Redefine debug_printf to allow conditional output. * cygwin.din: Export shmdt(). * shm.cc: Run indent. Update FIXME's. (shmdt): New function. * include/cygwin/cygserver.h (class client_request): Add process cache support. (class client_request_get_version): Ditto. (class client_request_shutdown): Ditto. (class client_request_attach_tty): Ditto. * include/cygwin/cygserver_process.h: New header for process cache support. Sun Sep 30 8:52:00 2001 Robert Collins <rbtcollins@hotmail.com> * include/cygwin/cygserver_transport.h: Add copyright header. * include/cygwin/cygserver_transport_pipes.h: Ditto. * include/cygwin/cygserver_transport_sockets.h: Ditto. Sat Sep 29 20:40:00 2001 Robert Collins <rbtcollins@hotmail.com> * Makefile.in: Add cygserver_transport_sockets.o to DLL_OFILES. Add cygserver_transport_sockets_outside.o to cygserver.exe. * cygserver.cc: Include new include files. * cygserver_client.cc: Ditto. * cygserver_shm.h: No need to include <sys/socket.h> now. * cygerver_transport.cc: Include new include files. (transport_layer_base::transport_layer_base): Strip back to a stub. (transport_layer_base::listen): Ditto. (transport_layer_base::accept): Ditto. (transport_layer_base::close): Ditto. (transport_layer_base::read): Ditto. (transport_layer_base::write): Ditto. (transport_layer_base::connect): Ditto. * cygserver_transport_pipes.cc: Include new header "cygwin/cygserver_transport_pipes.h". * cygserver_transport_sockets.cc: New file. * dcrt0.cc: No need to include <sys/socket.h> now. * fhandler_tty.cc: Ditto. * tty.cc: Ditto. * include/cygwin/cygserver_transport.h: Strip the base class to a stub. Remove the cygserver_transport_pipes class. * include/cygwin/cygserver_transport_pipes.h: New file. * include/cygwin/cygserver_transport_sockets.h: New file. Tue Sep 25 16:22:00 2001 Robert Collins <rbtcollins@hotmail.com> * autoload.cc: Add dynamic load statement for 'ImpersonateNamedPipeClient'. * Makefile.in: Add new object files, and build instructions for cygserver.exe. * cygwin.din: Export ftok, shmat, shmctl and shmget. * dcrt0.cc: Additional includes for cygserver support. (dll_crt0_1): Initialise the cygserver client. * fhandler.h (fhandler_tty): New method cygserver_attach_tty. * fhandler_tty.cc: Additional includes for cygserver support. (fhandler_tty_slave::open): Attempt to use the cygserver when obtaining handles from the parent process. On failure or 9x use the current method. (fhandler_tty_slave::cygserver_attach_tty): New function. * fork.cc (fork_child): Fixup shm memory mapped areas. * pinfo.h: Declare fixup_shms_after_fork(). * security.h: Declare alloc_sd(). * tty.cc: Additonal includes to support cygserver. (tty::common_init): Don't allow others to open us if the cygserver is running. * winsup.h: Declare cygserver_running. * cygserver.cc: New file. * cygserver_client.cc: New file. * cygserver_shm.cc: New file. * cygserver_shm.h: New file. * cygserver_transport.cc: New file. * cygserver_transport_pipes.cc: New file. * ipc.cc: New file. * shm.cc: New file. * include/cygwin/cygserver.h: New file. * include/cygwin/cygserver_transport.h: New file. * include/sys/ipc.h: New file. * include/sys/shm.h: New file. 2002-02-28 Robert Collins <rbtcollins@hotmail.com> * thread.cc (semaphore::TryWait): Set errno as required by posix 1003.1. (__sem_wait): Ditto. (__sem_trywait): Ditto.
2002-02-28 15:30:38 +01:00
/* cygserver_shm.cc: Single unix specification IPC interface for Cygwin
Copyright 2001 Red Hat, Inc.
Originally written by Robert Collins <robert.collins@hotmail.com>
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. */
#ifdef __OUTSIDE_CYGWIN__
#undef __INSIDE_CYGWIN__
#else
#include "winsup.h"
#endif
#ifndef __INSIDE_CYGWIN__
#define DEBUG 0
#define system_printf printf
#define debug_printf if (DEBUG) printf
#define api_fatal printf
#include <stdio.h>
#include <windows.h>
#endif
#include <sys/stat.h>
#include <errno.h>
#include "cygerrno.h"
#include <unistd.h>
#include "security.h"
//#include "fhandler.h"
//#include "dtable.h"
//#include "cygheap.h"
#include <stdio.h>
//#include "thread.h"
#ifndef __INSIDE_CYGWIN__
#define __INSIDE_CYGWIN__
#include <sys/shm.h>
#undef __INSIDE_CYGWIN__
#else
#include <sys/shm.h>
#endif
//#include "perprocess.h"
#include <threaded_queue.h>
#include <cygwin/cygserver_process.h>
#include "cygserver_shm.h"
// FIXME IS THIS CORRECT
/* Implementation notes: We use two shared memory regions per key:
* One for the control structure, and one for the shared memory.
* While this has a higher overhead tham a single shared area,
* It allows more flexability. As the entire code is transparent to the user
* We can merge these in the future should it be needed.
* Also, IPC_PRIVATE keys create unique mappings each time. The shm_ids just
* keep monotonically incrementing - system wide.
*/
size_t
getsystemallocgranularity ()
{
SYSTEM_INFO sysinfo;
static size_t buffer_offset = 0;
if (buffer_offset)
return buffer_offset;
GetSystemInfo (&sysinfo);
buffer_offset = sysinfo.dwAllocationGranularity;
return buffer_offset;
}
client_request_shm::client_request_shm ():client_request (CYGSERVER_REQUEST_SHM_GET, sizeof (parameters))
{
buffer = (char *) &parameters;
}
/* FIXME: If building on a 64-bit compiler, the address->int typecast will fail.
* Solution: manually calculate the next id value
*/
#if 0
extern "C" void *
shmat (int shmid, const void *shmaddr, int parameters.in.shmflg)
{
class shmid_ds *shm = (class shmid_ds *) shmid; //FIXME: verifyable object test
if (shmaddr)
{
//FIXME: requested base address ?!
set_errno (EINVAL);
return (void *) -1;
}
void *rv = MapViewOfFile (shm->attachmap,
(parameters.in.shmflg & SHM_RDONLY) ?
FILE_MAP_READ : FILE_MAP_WRITE, 0,
0, 0);
if (!rv)
{
//FIXME: translate GetLastError()
set_errno (EACCES);
return (void *) -1;
}
/* FIXME: this needs to be globally protected to prevent a mismatch betwen
* attach count and attachees list
*/
InterlockedIncrement (&shm->shm_nattch);
_shmattach *attachnode = new _shmattach;
attachnode->data = rv;
attachnode->next =
(_shmattach *) InterlockedExchangePointer ((LONG *) & shm->attachhead,
(long int) attachnode);
return rv;
}
#endif
/* FIXME: evaluate getuid() and getgid() against the requested mode. Then
* choose PAGE_READWRITE | PAGE_READONLY and FILE_MAP_WRITE | FILE_MAP_READ
* appropriately
*/
/* Test result from openbsd: shm ids are persistent cross process if a handle is left
* open. This could lead to resource starvation: we're not copying that behaviour
* unless we have to. (It will involve acygwin1.dll gloal shared list :[ ).
*/
/* FIXME: shmid should be a verifyable object
*/
/* FIXME: on NT we should check everything against the SD. On 95 we just emulate.
*/
extern GENERIC_MAPPING access_mapping;
extern int
check_and_dup_handle (HANDLE from_process, HANDLE to_process,
HANDLE from_process_token,
DWORD access,
HANDLE from_handle,
HANDLE * to_handle_ptr, BOOL bInheritHandle);
//FIXME: where should this live
static shmnode *shm_head = NULL;
/* must be long for InterlockedIncrement */
static long new_id = 0;
static long new_private_key = 0;
void
client_request_shm::serve (transport_layer_base * conn,
process_cache * cache)
{
// DWORD sd_size = 4096;
// char sd_buf[4096];
PSECURITY_DESCRIPTOR psd = (PSECURITY_DESCRIPTOR) parameters.in.sd_buf;
// /* create a sd for our open requests based on shmflag & 0x01ff */
// psd = alloc_sd (getuid (), getgid (), cygheap->user.logsrv (),
// parameters.in.shmflg & 0x01ff, psd, &sd_size);
HANDLE from_process_handle = NULL;
HANDLE token_handle = NULL;
DWORD rc;
from_process_handle = cache->process (parameters.in.pid)->handle ();
/* possible TODO: reduce the access on the handle before we use it */
/* Note that unless we do this, we don't need to call CloseHandle - it's kept open
* by the process cache until the process terminates.
* We may need a refcount on the cache however...
*/
if (!from_process_handle)
{
debug_printf ("error opening process (%lu)\n", GetLastError ());
header.error_code = EACCES;
return;
}
conn->impersonate_client ();
rc = OpenThreadToken (GetCurrentThread (),
TOKEN_QUERY, TRUE, &token_handle);
conn->revert_to_self ();
if (!rc)
{
debug_printf ("error opening thread token (%lu)\n", GetLastError ());
header.error_code = EACCES;
CloseHandle (from_process_handle);
return;
}
/* we trust the clients request - we will be doing it as them, and
* the worst they can do is open their own permissions
*/
SECURITY_ATTRIBUTES sa;
sa.nLength = sizeof (sa);
sa.lpSecurityDescriptor = psd;
sa.bInheritHandle = TRUE; /* the memory structures inherit ok */
char *shmname = NULL, *shmaname = NULL;
char stringbuf[29], stringbuf1[29];
/* TODO: make this code block a function! */
if (parameters.in.type == SHM_REATTACH)
{
/* just find and fill out the existing shm_id */
shmnode *tempnode = shm_head;
while (tempnode)
{
if (tempnode->shm_id == parameters.in.shm_id)
{
parameters.out.shm_id = tempnode->shm_id;
parameters.out.key = tempnode->key;
if (check_and_dup_handle
(GetCurrentProcess (), from_process_handle, token_handle,
DUPLICATE_SAME_ACCESS, tempnode->filemap,
&parameters.out.filemap, TRUE) != 0)
{
debug_printf ("error duplicating filemap handle (%lu)\n",
GetLastError ());
header.error_code = EACCES;
}
if (check_and_dup_handle
(GetCurrentProcess (), from_process_handle, token_handle,
DUPLICATE_SAME_ACCESS, tempnode->attachmap,
&parameters.out.attachmap, TRUE) != 0)
{
debug_printf ("error duplicating attachmap handle (%lu)\n",
GetLastError ());
header.error_code = EACCES;
}
CloseHandle (token_handle);
return;
}
tempnode = tempnode->next;
}
header.error_code = EINVAL;
CloseHandle (token_handle);
return;
}
/* someone attached */
/* someone can send shm_id's they don't have and currently we will increment those
* attach counts. If someone wants to fix that, please go ahead.
* The problem is that shm_get has nothing to do with the ability to attach. Attach
* requires a permission check, which we get the OS to do in MapViewOfFile.
*/
if (parameters.in.type == SHM_ATTACH)
{
shmnode *tempnode = shm_head;
while (tempnode)
{
if (tempnode->shm_id == parameters.in.shm_id)
{
InterlockedIncrement (&tempnode->shmds->shm_nattch);
header.error_code = 0;
CloseHandle (token_handle);
return;
}
tempnode = tempnode->next;
}
header.error_code = EINVAL;
CloseHandle (token_handle);
return;
}
/* it's a original request from the users */
/* FIXME: enter the checking for existing keys mutex. This mutex _must_ be system wide
* to prevent races on shmget.
*/
if (parameters.in.key == IPC_PRIVATE)
{
/* create the mapping name (CYGWINSHMKPRIVATE_0x01234567 */
/* The K refers to Key, the actual mapped area has D */
long private_key = (int) InterlockedIncrement (&new_private_key);
snprintf (stringbuf, 29, "CYGWINSHMKPRIVATE_0x%0x", private_key);
shmname = stringbuf;
snprintf (stringbuf1, 29, "CYGWINSHMDPRIVATE_0x%0x", private_key);
shmaname = stringbuf1;
}
else
{
/* create the mapping name (CYGWINSHMK0x0123456789abcdef */
/* The K refers to Key, the actual mapped area has D */
snprintf (stringbuf, 29, "CYGWINSHMK0x%0qx", parameters.in.key);
shmname = stringbuf;
snprintf (stringbuf1, 29, "CYGWINSHMD0x%0qx", parameters.in.key);
shmaname = stringbuf1;
debug_printf ("system id strings are \n%s\n%s\n", shmname, shmaname);
debug_printf ("key input value is 0x%0qx\n", parameters.in.key);
}
/* attempt to open the key */
/* get an existing key */
/* On unix the same shmid identifier is returned on multiple calls to shm_get
* with the same key and size. Different modes is a ?.
*/
/* walk the list of known keys and return the id if found. remember, we are
* authoritative...
*/
shmnode *tempnode = shm_head;
while (tempnode)
{
if (tempnode->key == parameters.in.key
&& parameters.in.key != IPC_PRIVATE)
{
// FIXME: free the mutex
if (parameters.in.size
&& tempnode->shmds->shm_segsz < parameters.in.size)
{
header.error_code = EINVAL;
CloseHandle (token_handle);
return;
}
/* FIXME: can the same process call this twice without error ? test
* on unix
*/
if ((parameters.in.shmflg & IPC_CREAT)
&& (parameters.in.shmflg & IPC_EXCL))
{
header.error_code = EEXIST;
debug_printf
("attempt to exclusively create already created shm_area with key 0x%0qx\n",
parameters.in.key);
// FIXME: free the mutex
CloseHandle (token_handle);
return;
}
// FIXME: do we need to other tests of the requested mode with the
// tempnode->shm_id mode ? testcase on unix needed.
// FIXME how do we do the security test? or
// do we wait for shmat to bother with that?
/* One possibly solution: impersonate the client, and then test we can
* reopen the area. In fact we'll probably have to do that to get
* handles back to them, alternatively just tell them the id, and then
* let them attempt the open.
*/
parameters.out.shm_id = tempnode->shm_id;
if (check_and_dup_handle (GetCurrentProcess (), from_process_handle,
token_handle,
DUPLICATE_SAME_ACCESS,
tempnode->filemap,
&parameters.out.filemap, TRUE) != 0)
{
printf ("error duplicating filemap handle (%lu)\n",
GetLastError ());
header.error_code = EACCES;
/*mutex*/
CloseHandle (token_handle);
return;
}
if (check_and_dup_handle (GetCurrentProcess (), from_process_handle,
token_handle,
DUPLICATE_SAME_ACCESS,
tempnode->attachmap,
&parameters.out.attachmap, TRUE) != 0)
{
printf ("error duplicating attachmap handle (%lu)\n",
GetLastError ());
header.error_code = EACCES;
/*mutex*/
CloseHandle (token_handle);
return;
}
CloseHandle (token_handle);
return;
}
tempnode = tempnode->next;
}
/* couldn't find a currently open shm area. */
/* create one */
/* do this as the client */
conn->impersonate_client ();
/* This may need sh_none... it's only a control structure */
HANDLE filemap = CreateFileMapping (INVALID_HANDLE_VALUE, // system pagefile.
&sa,
PAGE_READWRITE, // protection
0x00000000,
getsystemallocgranularity (),
shmname // object name
);
int lasterr = GetLastError ();
conn->revert_to_self ();
if (filemap == NULL)
{
/* We failed to open the filemapping ? */
system_printf ("failed to open file mapping: %lu\n", GetLastError ());
// free the mutex
// we can assume that it exists, and that it was an access problem.
header.error_code = EACCES;
CloseHandle (token_handle);
return;
}
/* successfully opened the control region mapping */
/* did we create it ? */
int oldmapping = lasterr == ERROR_ALREADY_EXISTS;
if (oldmapping)
{
/* should never happen - we are the global daemon! */
#if 0
if ((parameters.in.shmflg & IPC_CREAT)
&& (parameters.in.shmflg & IPC_EXCL))
#endif
{
/* FIXME free mutex */
CloseHandle (filemap);
header.error_code = EEXIST;
CloseHandle (token_handle);
return;
}
}
/* we created a new mapping */
if (parameters.in.key != IPC_PRIVATE &&
(parameters.in.shmflg & IPC_CREAT) == 0)
{
CloseHandle (filemap);
/* FIXME free mutex */
header.error_code = ENOENT;
CloseHandle (token_handle);
return;
}
conn->impersonate_client ();
void *mapptr = MapViewOfFile (filemap, FILE_MAP_WRITE, 0, 0, 0);
conn->revert_to_self ();
if (!mapptr)
{
CloseHandle (filemap);
//FIXME: close filemap and free the mutex
/* we couldn't access the mapped area with the requested permissions */
header.error_code = EACCES;
CloseHandle (token_handle);
return;
}
conn->impersonate_client ();
/* Now get the user data */
HANDLE attachmap = CreateFileMapping (INVALID_HANDLE_VALUE, // system pagefile
&sa,
PAGE_READWRITE, // protection (FIXME)
0x00000000,
parameters.in.size +
parameters.in.size %
getsystemallocgranularity (),
shmaname // object name
);
conn->revert_to_self ();
if (attachmap == NULL)
{
system_printf ("failed to get shm attachmap\n");
header.error_code = ENOMEM;
UnmapViewOfFile (mapptr);
CloseHandle (filemap);
/* FIXME exit the mutex */
CloseHandle (token_handle);
return;
}
shmid_ds *shmtemp = new shmid_ds;
if (!shmtemp)
{
system_printf ("failed to malloc shm node\n");
header.error_code = ENOMEM;
UnmapViewOfFile (mapptr);
CloseHandle (filemap);
CloseHandle (attachmap);
/* FIXME exit mutex */
CloseHandle (token_handle);
return;
}
/* fill out the node data */
shmtemp->shm_perm.cuid = getuid ();
shmtemp->shm_perm.uid = shmtemp->shm_perm.cuid;
shmtemp->shm_perm.cgid = getgid ();
shmtemp->shm_perm.gid = shmtemp->shm_perm.cgid;
shmtemp->shm_perm.mode = parameters.in.shmflg & 0x01ff;
shmtemp->shm_lpid = 0;
shmtemp->shm_nattch = 0;
shmtemp->shm_atime = 0;
shmtemp->shm_dtime = 0;
shmtemp->shm_ctime = time (NULL);
shmtemp->shm_segsz = parameters.in.size;
*(shmid_ds *) mapptr = *shmtemp;
shmtemp->mapptr = mapptr;
/* no need for InterlockedExchange here, we're serialised by the global mutex */
tempnode = new shmnode;
tempnode->shmds = shmtemp;
tempnode->shm_id = (int) InterlockedIncrement (&new_id);
tempnode->key = parameters.in.key;
tempnode->filemap = filemap;
tempnode->attachmap = attachmap;
tempnode->next = shm_head;
shm_head = tempnode;
/* we now have the area in the daemon list, opened.
FIXME: leave the system wide shm mutex */
parameters.out.shm_id = tempnode->shm_id;
if (check_and_dup_handle (GetCurrentProcess (), from_process_handle,
token_handle,
DUPLICATE_SAME_ACCESS,
tempnode->filemap, &parameters.out.filemap,
TRUE) != 0)
{
printf ("error duplicating filemap handle (%lu)\n", GetLastError ());
header.error_code = EACCES;
CloseHandle (token_handle);
/* mutex et al */
return;
}
if (check_and_dup_handle (GetCurrentProcess (), from_process_handle,
token_handle,
DUPLICATE_SAME_ACCESS,
tempnode->attachmap, &parameters.out.attachmap,
TRUE) != 0)
{
printf ("error duplicating attachmap handle (%lu)\n", GetLastError ());
header.error_code = EACCES;
CloseHandle (from_process_handle);
CloseHandle (token_handle);
/* more cleanup... yay! */
return;
}
CloseHandle (token_handle);
return;
}