125 lines
3.2 KiB
C++
125 lines
3.2 KiB
C++
/* shm.cc: Single unix specification IPC interface for Cygwin.
|
|
|
|
Copyright 2003, 2004, 2012 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. */
|
|
|
|
#ifdef __OUTSIDE_CYGWIN__
|
|
#include "woutsup.h"
|
|
|
|
#include <errno.h>
|
|
#include <pthread.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
|
|
#include "cygserver.h"
|
|
#include "process.h"
|
|
#include "transport.h"
|
|
|
|
#include "cygserver_ipc.h"
|
|
#include "cygserver_shm.h"
|
|
|
|
client_request_shm::client_request_shm ()
|
|
: client_request (CYGSERVER_REQUEST_SHM,
|
|
&_parameters, sizeof (_parameters))
|
|
{
|
|
}
|
|
|
|
void
|
|
client_request_shm::serve (transport_layer_base *const conn,
|
|
process_cache *const cache)
|
|
{
|
|
if (msglen () != sizeof (_parameters.in))
|
|
{
|
|
syscall_printf ("bad request body length: expecting %lu bytes, got %lu",
|
|
sizeof (_parameters), msglen ());
|
|
error_code (EINVAL);
|
|
msglen (0);
|
|
return;
|
|
}
|
|
if (support_sharedmem == TUN_FALSE)
|
|
{
|
|
syscall_printf ("Shared memory support not started");
|
|
error_code (ENOSYS);
|
|
if (_parameters.in.shmop == SHMOP_shmat)
|
|
_parameters.out.ptr = (vm_offset_t)0;
|
|
else
|
|
_parameters.out.ret = -1;
|
|
msglen (sizeof (_parameters.out));
|
|
return;
|
|
}
|
|
process *const client = cache->process (_parameters.in.ipcblk.cygpid,
|
|
_parameters.in.ipcblk.winpid,
|
|
_parameters.in.ipcblk.signal_arrived);
|
|
if (!client)
|
|
{
|
|
error_code (EAGAIN);
|
|
msglen (0);
|
|
return;
|
|
}
|
|
if (!conn->impersonate_client ())
|
|
{
|
|
client->release ();
|
|
error_code (EACCES);
|
|
msglen (0);
|
|
return;
|
|
}
|
|
if (!adjust_identity_info (&_parameters.in.ipcblk))
|
|
{
|
|
client->release ();
|
|
conn->revert_to_self ();
|
|
error_code (EACCES);
|
|
msglen (0);
|
|
return;
|
|
}
|
|
/* Early revert_to_self since IPC code runs in kernel mode. */
|
|
conn->revert_to_self ();
|
|
/* sysv_shm.cc takes care of itself. */
|
|
client->release ();
|
|
thread td = { client, &_parameters.in.ipcblk, {0, 0} };
|
|
int res;
|
|
shmop_t shmop = _parameters.in.shmop; /* Get's overwritten otherwise. */
|
|
switch (shmop)
|
|
{
|
|
case SHMOP_shmat:
|
|
ipc_p_vmspace (td.ipcblk);
|
|
res = shmat (&td, &_parameters.in.atargs);
|
|
break;
|
|
case SHMOP_shmctl:
|
|
res = shmctl (&td, &_parameters.in.ctlargs);
|
|
break;
|
|
case SHMOP_shmdt:
|
|
ipc_p_vmspace (td.ipcblk);
|
|
res = shmdt (&td, &_parameters.in.dtargs);
|
|
break;
|
|
case SHMOP_shmget:
|
|
res = shmget (&td, &_parameters.in.getargs);
|
|
break;
|
|
case SHMOP_shmfork:
|
|
res = cygwin_shmfork_myhook (&td, &_parameters.in.forkargs);
|
|
break;
|
|
default:
|
|
res = ENOSYS;
|
|
td.td_retval[0] = -1;
|
|
break;
|
|
}
|
|
/* Allocated by the call to adjust_identity_info(). */
|
|
if (_parameters.in.ipcblk.gidlist)
|
|
free (_parameters.in.ipcblk.gidlist);
|
|
error_code (res);
|
|
if (shmop == SHMOP_shmat)
|
|
_parameters.out.ptr = td.td_retval[0];
|
|
else
|
|
_parameters.out.ret = td.td_retval[0];
|
|
if (shmop == SHMOP_shmget)
|
|
_parameters.out.obj = td.td_retval[1];
|
|
msglen (sizeof (_parameters.out));
|
|
}
|
|
#endif /* __OUTSIDE_CYGWIN__ */
|