105 lines
2.5 KiB
C++
105 lines
2.5 KiB
C++
/* sem.cc: Single unix specification IPC interface for Cygwin.
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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_sem.h"
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client_request_sem::client_request_sem ()
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: client_request (CYGSERVER_REQUEST_SEM,
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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_sem::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_semaphores == TUN_FALSE)
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{
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syscall_printf ("Semaphore support not started");
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error_code (ENOSYS);
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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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/* sysv_sem.cc takes care of itself. */
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client->release ();
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thread td (client, &_parameters.in.ipcblk, true);
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int res;
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switch (_parameters.in.semop)
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{
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case SEMOP_semctl:
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res = semctl (&td, &_parameters.in.ctlargs);
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break;
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case SEMOP_semget:
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res = semget (&td, &_parameters.in.getargs);
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break;
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case SEMOP_semop:
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res = semop (&td, &_parameters.in.opargs);
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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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error_code (res);
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_parameters.out.ret = td.td_retval[0];
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msglen (sizeof (_parameters.out));
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}
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#endif /* __OUTSIDE_CYGWIN__ */
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