1 /* shm.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_shm.h"
28 client_request_shm::client_request_shm ()
29 : client_request (CYGSERVER_REQUEST_SHM,
30 &_parameters, sizeof (_parameters))
35 client_request_shm::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_sharedmem == TUN_FALSE)
48 syscall_printf ("Shared memory support not started");
50 if (_parameters.in.shmop == SHMOP_shmat)
51 _parameters.out.ptr = (vm_offset_t)0;
53 _parameters.out.ret = -1;
54 msglen (sizeof (_parameters.out));
57 process *const client = cache->process (_parameters.in.ipcblk.cygpid,
58 _parameters.in.ipcblk.winpid,
59 _parameters.in.ipcblk.signal_arrived);
66 if (!conn->impersonate_client ())
73 if (!adjust_identity_info (&_parameters.in.ipcblk))
76 conn->revert_to_self ();
81 /* Early revert_to_self since IPC code runs in kernel mode. */
82 conn->revert_to_self ();
83 /* sysv_shm.cc takes care of itself. */
85 thread td = { client, &_parameters.in.ipcblk, {0, 0} };
87 shmop_t shmop = _parameters.in.shmop; /* Get's overwritten otherwise. */
91 ipc_p_vmspace (td.ipcblk);
92 res = shmat (&td, &_parameters.in.atargs);
95 res = shmctl (&td, &_parameters.in.ctlargs);
98 ipc_p_vmspace (td.ipcblk);
99 res = shmdt (&td, &_parameters.in.dtargs);
102 res = shmget (&td, &_parameters.in.getargs);
105 res = cygwin_shmfork_myhook (&td, &_parameters.in.forkargs);
109 td.td_retval[0] = -1;
112 /* Allocated by the call to adjust_identity_info(). */
113 if (_parameters.in.ipcblk.gidlist)
114 free (_parameters.in.ipcblk.gidlist);
116 if (shmop == SHMOP_shmat)
117 _parameters.out.ptr = td.td_retval[0];
119 _parameters.out.ret = td.td_retval[0];
120 if (shmop == SHMOP_shmget)
121 _parameters.out.obj = td.td_retval[1];
122 msglen (sizeof (_parameters.out));
124 #endif /* __OUTSIDE_CYGWIN__ */