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ntdll: Simplify wine_server_handle_to_fd. 

Now that we have a critical section, races are no longer possible.
This commit is contained in:
Alexandre Julliard 2006-11-01 13:27:18 +01:00
parent 0d29ba96d3
commit 226a14a483
1 changed files with 55 additions and 64 deletions
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119
dlls/ntdll/server.c
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@ -493,76 +493,67 @@ int wine_server_handle_to_fd( obj_handle_t handle, unsigned int access, int *uni
RtlEnterCriticalSection( &fd_cache_section );
*unix_fd = -1;
for (;;)
SERVER_START_REQ( get_handle_fd )
{
SERVER_START_REQ( get_handle_fd )
req->handle = handle;
req->access = access;
if (!(ret = wine_server_call( req )))
{
req->handle = handle;
req->access = access;
if (!(ret = wine_server_call( req )))
{
fd = reply->fd;
removable = reply->removable;
if (flags) *flags = reply->flags;
}
fd = reply->fd;
removable = reply->removable;
if (flags) *flags = reply->flags;
}
SERVER_END_REQ;
if (ret) break;
}
SERVER_END_REQ;
if (ret) goto done;
if (fd != -1)
{
if ((fd = dup(fd)) == -1) ret = FILE_GetNtStatus();
break;
}
/* it wasn't in the cache, get it from the server */
fd = receive_fd( &fd_handle );
if (fd == -1)
{
ret = STATUS_TOO_MANY_OPENED_FILES;
break;
}
if (fd_handle != handle) removable = -1;
if (removable == -1)
{
FILE_FS_DEVICE_INFORMATION info;
if (FILE_GetDeviceInfo( fd, &info ) == STATUS_SUCCESS)
removable = (info.Characteristics & FILE_REMOVABLE_MEDIA) != 0;
}
else if (removable) break; /* don't cache it */
/* and store it back into the cache */
SERVER_START_REQ( set_handle_fd )
{
req->handle = fd_handle;
req->fd = fd;
req->removable = removable;
if (!(ret = wine_server_call( req )))
{
if (reply->cur_fd != -1) /* it has been cached */
{
if (reply->cur_fd != fd) close( fd ); /* someone was here before us */
if ((fd = dup(reply->cur_fd)) == -1) ret = FILE_GetNtStatus();
}
}
else
{
close( fd );
fd = -1;
}
}
SERVER_END_REQ;
if (ret) break;
if (fd_handle == handle) break;
/* if we received a different handle this means there was
* a race with another thread; we restart everything from
* scratch in this case.
*/
close( fd );
if (fd != -1)
{
if ((fd = dup(fd)) == -1) ret = FILE_GetNtStatus();
goto done;
}
/* it wasn't in the cache, get it from the server */
fd = receive_fd( &fd_handle );
if (fd == -1)
{
ret = STATUS_TOO_MANY_OPENED_FILES;
goto done;
}
assert( fd_handle == handle );
if (removable == -1)
{
FILE_FS_DEVICE_INFORMATION info;
if (FILE_GetDeviceInfo( fd, &info ) == STATUS_SUCCESS)
removable = (info.Characteristics & FILE_REMOVABLE_MEDIA) != 0;
}
else if (removable) goto done; /* don't cache it */
/* and store it back into the cache */
SERVER_START_REQ( set_handle_fd )
{
req->handle = fd_handle;
req->fd = fd;
req->removable = removable;
if (!(ret = wine_server_call( req )))
{
if (reply->cur_fd != -1) /* it has been cached */
{
if (reply->cur_fd != fd) close( fd ); /* someone was here before us */
if ((fd = dup(reply->cur_fd)) == -1) ret = FILE_GetNtStatus();
}
}
else
{
close( fd );
fd = -1;
}
}
SERVER_END_REQ;
done:
RtlLeaveCriticalSection( &fd_cache_section );
if (!ret) *unix_fd = fd;
return ret;