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VMware Tools

  Overview of VMware Tools VMware Tools is a suite of utilities that enhances the performance of the virtual machines guest operating system and improves management of the virtual machine. Without VMware Tools installed in your guest operating system, guest performance lacks important functionality. Installing VMware Tools eliminates or improves these issues: Low video resolution Inadequate color depth Incorrect display of network speed Restricted movement of the mouse Inability to copy and paste and drag-and-drop files Missing sound Provides the ability to take quiesced snapshots of the guest OS Synchronizes the time in the guest operating system with the time on the host VMware Tools includes these components: VMware Tools service VMware device drivers VMware user process VMware Tools control panel VMware Tools is provided in these formats: ISOs (containing installers): These are packaged with the product and are installed in a number of ways, dependi
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Stubbing method which manipulates parameters using Mockito

Mockito is a mocking framework which enables mock creation, verification and stubbing. It has been widely used in Java community to write beautiful tests with its clean and simple API. Recently I was writing a unit test which involves stubbing a non-void method that manipulates the given parameter. The method would look like this: public interface Accessor { Data get(String dataId, Attribute attribute); } The get method will return the data associated with the given id and set the attribute of data accordingly. We can create the mock as usual: Accessor accessor = Mockito.mock(Accessor.class); Following code snippet shows how to manipulate the parameter in get method: Mockito.when(accessor.get(anyString(), any(Attribute.class))).thenAnswer(new Answer() { @Override public Object answer(InvocationOnMock invocationOnMock) throws Throwable { Object[] args = invocationOnMock.getArguments(); Attribute attribute = (Attribute) args[1]; // Set the attribute
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Linux kernel documentation for /sys/class/net

Recently I am working on a project to handle network interface failure which involves detecting the connected state of a network cable. After searching around the Internet I found the post from Stack Overflow mentioned a good way to solve the problem. As Kent Fredric said,we can use /sys/class/net/<iface>/carrier and  /sys/class/net/<iface>/operstate to identify the connected state of a network cable. What does /sys/class/net/<iface>/carrier and /sys/class/net/<iface>/operstate means? From the kernel documentation I found the description for them: What: /sys/class/net/<iface>/operstate Date: March 2006 KernelVersion: 2.6.17 Contact: netdev@vger.kernel.org Description: Indicates the interface RFC2863 operational state as a string. Possible values are: "unknown", "notpresent", "down", "lowerlayerdown", "testing", "dormant", "up". What: /sys/class/net/<iface>/carr
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Location: San Jose, CA, USA
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Resolve issue ImportError: No module named thrift.Thrift when running python script

  When running python script which using struct and/or service defined in thrift, a problem shows up with the error message below:   Traceback (most recent call last):    File "./test.py", line 8, in <module>      from test import TestService    File "../thrift/gen-py/test/TestService.py", line 9, in <module>      from thrift.Thrift import TType, TMessageType, TException, TApplicationException    ImportError: No module named thrift.Thrift From the error message we can see that the python script test.py import a module TestService which is defined in a thrift and the thrift-generated python file is "../thrift/gen-py/test/TestService.py, and the file TestService.py imports TType, TMessageType, TException, TApplicationException and get ImportError. It must be a configuration issue since TType, TMessageType, TException, and TApplicationException should be included when Thrift is installed. After searching around in Google, I found that a blog
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Errors: Linux System Errors

Source link: http://www-numi.fnal.gov/offline_software/srt_public_context/WebDocs/Errors/unix_system_errors.html When system requests fail, error code are returned. To understand the nature of the error these codes need to be interpreted. They are recorded in:- /usr/include/asm/errno.h Here is a copy of that file as of Aug 2004 on RedHat 7.3 #define EPERM 1 /* Operation not permitted */ #define ENOENT 2 /* No such file or directory */ #define ESRCH 3 /* No such process */ #define EINTR 4 /* Interrupted system call */ #define EIO 5 /* I/O error */ #define ENXIO 6 /* No such device or address */ #define E2BIG 7 /* Arg list too long */ #define ENOEXEC 8 /* Exec format error */ #define EBADF 9 /* Bad file number */ #define ECHILD 10 /* No child processes */ #define EAGAIN 11 /* Try again */ #define ENOMEM
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