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sourceware.org Git - newlib-cygwin.git/blob - winsup/cygserver/sem.cc
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__ */
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