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sourceware.org Git - newlib-cygwin.git/blob - winsup/cygserver/shm.cc
1 /* shm.cc: Single unix specification IPC interface for Cygwin.
3 This file is part of Cygwin.
5 This software is a copyrighted work licensed under the terms of the
6 Cygwin license. Please consult the file "CYGWIN_LICENSE" for
9 #ifdef __OUTSIDE_CYGWIN__
19 #include "cygserver.h"
21 #include "transport.h"
23 #include "cygserver_ipc.h"
24 #include "cygserver_shm.h"
26 client_request_shm::client_request_shm ()
27 : client_request (CYGSERVER_REQUEST_SHM
,
28 &_parameters
, sizeof (_parameters
))
33 client_request_shm::serve (transport_layer_base
*const conn
,
34 process_cache
*const cache
)
36 if (msglen () != sizeof (_parameters
.in
))
38 syscall_printf ("bad request body length: expecting %lu bytes, got %lu",
39 sizeof (_parameters
), msglen ());
44 if (support_sharedmem
== TUN_FALSE
)
46 syscall_printf ("Shared memory support not started");
48 if (_parameters
.in
.shmop
== SHMOP_shmat
)
49 _parameters
.out
.ptr
= (vm_offset_t
)0;
51 _parameters
.out
.ret
= -1;
52 msglen (sizeof (_parameters
.out
));
55 process
*const client
= cache
->process (_parameters
.in
.ipcblk
.cygpid
,
56 _parameters
.in
.ipcblk
.winpid
);
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_shm.cc takes care of itself. */
82 thread
td (client
, &_parameters
.in
.ipcblk
, false);
84 shmop_t shmop
= _parameters
.in
.shmop
; /* Get's overwritten otherwise. */
88 ipc_p_vmspace (td
.ipcblk
);
89 res
= shmat (&td
, &_parameters
.in
.atargs
);
92 res
= shmctl (&td
, &_parameters
.in
.ctlargs
);
95 ipc_p_vmspace (td
.ipcblk
);
96 res
= shmdt (&td
, &_parameters
.in
.dtargs
);
99 res
= shmget (&td
, &_parameters
.in
.getargs
);
102 res
= cygwin_shmfork_myhook (&td
, &_parameters
.in
.forkargs
);
106 td
.td_retval
[0] = -1;
109 /* Allocated by the call to adjust_identity_info(). */
110 if (_parameters
.in
.ipcblk
.gidlist
)
111 free (_parameters
.in
.ipcblk
.gidlist
);
113 if (shmop
== SHMOP_shmat
)
114 _parameters
.out
.ptr
= td
.td_retval
[0];
116 _parameters
.out
.ret
= td
.td_retval
[0];
117 if (shmop
== SHMOP_shmget
)
118 _parameters
.out
.obj
= td
.td_retval
[1];
119 msglen (sizeof (_parameters
.out
));
121 #endif /* __OUTSIDE_CYGWIN__ */
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