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/* sem.cc: Single unix specification IPC interface for Cygwin.
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_sem.h"
client_request_sem::client_request_sem ()
: client_request (CYGSERVER_REQUEST_SEM,
&_parameters, sizeof (_parameters))
{
}
void
client_request_sem::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_semaphores == TUN_FALSE)
{
syscall_printf ("Semaphore support not started");
error_code (ENOSYS);
_parameters.out.ret = -1;
msglen (sizeof (_parameters.out));
return;
}
process *const client = cache->process (_parameters.in.ipcblk.cygpid,
_parameters.in.ipcblk.winpid);
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_sem.cc takes care of itself. */
client->release ();
thread td (client, &_parameters.in.ipcblk, true);
int res;
switch (_parameters.in.semop)
{
case SEMOP_semctl:
res = semctl (&td, &_parameters.in.ctlargs);
break;
case SEMOP_semget:
res = semget (&td, &_parameters.in.getargs);
break;
case SEMOP_semop:
res = semop (&td, &_parameters.in.opargs);
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);
_parameters.out.ret = td.td_retval[0];
msglen (sizeof (_parameters.out));
}
#endif /* __OUTSIDE_CYGWIN__ */
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