123 lines
3.1 KiB
C++
123 lines
3.1 KiB
C++
/* shm.cc: Single unix specification IPC interface for Cygwin.
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Copyright 2003 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#ifdef __OUTSIDE_CYGWIN__
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#include "woutsup.h"
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#include <errno.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include "cygserver.h"
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#include "process.h"
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#include "transport.h"
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#include "cygserver_ipc.h"
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#include "cygserver_shm.h"
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client_request_shm::client_request_shm ()
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: client_request (CYGSERVER_REQUEST_SHM,
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&_parameters, sizeof (_parameters))
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{
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}
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void
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client_request_shm::serve (transport_layer_base *const conn,
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process_cache *const cache)
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{
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if (msglen () != sizeof (_parameters.in))
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{
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syscall_printf ("bad request body length: expecting %lu bytes, got %lu",
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sizeof (_parameters), msglen ());
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error_code (EINVAL);
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msglen (0);
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return;
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}
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if (support_sharedmem == TUN_FALSE)
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{
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syscall_printf ("Shared memory support not started");
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error_code (ENOSYS);
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if (_parameters.in.shmop == SHMOP_shmat)
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_parameters.out.ptr = (vm_offset_t)0;
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else
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_parameters.out.ret = -1;
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msglen (sizeof (_parameters.out));
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return;
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}
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process *const client = cache->process (_parameters.in.ipcblk.cygpid,
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_parameters.in.ipcblk.winpid);
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if (!client)
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{
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error_code (EAGAIN);
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msglen (0);
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return;
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}
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if (!conn->impersonate_client ())
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{
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client->release ();
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error_code (EACCES);
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msglen (0);
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return;
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}
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if (!adjust_identity_info (&_parameters.in.ipcblk))
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{
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client->release ();
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conn->revert_to_self ();
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error_code (EACCES);
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msglen (0);
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return;
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}
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/* Early revert_to_self since IPC code runs in kernel mode. */
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conn->revert_to_self ();
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thread td = { client, &_parameters.in.ipcblk, {0, 0} };
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int res;
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shmop_t shmop = _parameters.in.shmop; /* Get's overwritten otherwise. */
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switch (shmop)
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{
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case SHMOP_shmat:
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ipc_p_vmspace (td.ipcblk);
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res = shmat (&td, &_parameters.in.atargs);
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break;
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case SHMOP_shmctl:
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res = shmctl (&td, &_parameters.in.ctlargs);
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break;
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case SHMOP_shmdt:
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ipc_p_vmspace (td.ipcblk);
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res = shmdt (&td, &_parameters.in.dtargs);
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break;
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case SHMOP_shmget:
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res = shmget (&td, &_parameters.in.getargs);
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break;
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case SHMOP_shmfork:
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res = cygwin_shmfork_myhook (&td, &_parameters.in.forkargs);
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break;
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default:
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res = ENOSYS;
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td.td_retval[0] = -1;
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break;
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}
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/* Allocated by the call to adjust_identity_info(). */
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if (_parameters.in.ipcblk.gidlist)
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free (_parameters.in.ipcblk.gidlist);
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client->release ();
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error_code (res);
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if (shmop == SHMOP_shmat)
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_parameters.out.ptr = td.td_retval[0];
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else
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_parameters.out.ret = td.td_retval[0];
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if (shmop == SHMOP_shmget)
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_parameters.out.obj = td.td_retval[1];
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msglen (sizeof (_parameters.out));
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}
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#endif /* __OUTSIDE_CYGWIN__ */
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