1 /* sem.cc: Single unix specification IPC interface for Cygwin.
3 Copyright 2003, 2004 Red Hat, Inc.
5 This file is part of Cygwin.
7 This software is a copyrighted work licensed under the terms of the
8 Cygwin license. Please consult the file "CYGWIN_LICENSE" for
11 #ifdef __OUTSIDE_CYGWIN__
21 #include "cygserver.h"
23 #include "transport.h"
25 #include "cygserver_ipc.h"
26 #include "cygserver_sem.h"
28 client_request_sem::client_request_sem ()
29 : client_request (CYGSERVER_REQUEST_SEM,
30 &_parameters, sizeof (_parameters))
35 client_request_sem::serve (transport_layer_base *const conn,
36 process_cache *const cache)
38 if (msglen () != sizeof (_parameters.in))
40 syscall_printf ("bad request body length: expecting %lu bytes, got %lu",
41 sizeof (_parameters), msglen ());
46 if (support_semaphores == TUN_FALSE)
48 syscall_printf ("Semaphore support not started");
50 _parameters.out.ret = -1;
51 msglen (sizeof (_parameters.out));
54 process *const client = cache->process (_parameters.in.ipcblk.cygpid,
55 _parameters.in.ipcblk.winpid,
56 _parameters.in.ipcblk.signal_arrived);
63 if (!conn->impersonate_client ())
70 if (!adjust_identity_info (&_parameters.in.ipcblk))
73 conn->revert_to_self ();
78 /* Early revert_to_self since IPC code runs in kernel mode. */
79 conn->revert_to_self ();
80 /* sysv_sem.cc takes care of itself. */
82 thread td = { client, &_parameters.in.ipcblk, {-1, -1} };
84 switch (_parameters.in.semop)
87 res = semctl (&td, &_parameters.in.ctlargs);
90 res = semget (&td, &_parameters.in.getargs);
93 res = semop (&td, &_parameters.in.opargs);
100 /* Allocated by the call to adjust_identity_info(). */
101 if (_parameters.in.ipcblk.gidlist)
102 free (_parameters.in.ipcblk.gidlist);
104 _parameters.out.ret = td.td_retval[0];
105 msglen (sizeof (_parameters.out));
107 #endif /* __OUTSIDE_CYGWIN__ */