ipc

问题 A while back I wrote a program that lets you pick and modify windows. It uses WindowFromPoint() to get a handle to the window under the mouse cursor and calls GetWindowText() on that to get the window’s title. This works just fine. I then added the ability to get the title of columns of a list-control. The problem is that unlike GetColumnWidth() which returns the width, there is no corresponding function to get the title. Instead, getting the title of the column header requires passing a

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . We are going to implement a multi-process software and we are looking for a proper IPC. Facts: We are going to use Java (and C if we face something time critical) All the processes are on a single Unix machine. The processes sends each other lots (about 1000) of small (about 4k) data per second. What IPC tech do

问题 I'm writting a Windows Java application that needs to call unsafe native code, and I need to prevent this code from having access to Java objects and JVM data structures, otherwise it might crash the JVM or hack into sensitive data. Before you ask, this native code is previously verified - it can only call a few APIs and cannot have certain instructions, so we know it won't VirtualProtect itself or other memory regions to gain more access and mess around. Anyway, my first attempt was to wrap

问题 Security tips chapter related to AccountManager mentions that: If credentials are used only by applications that you create, you can verify the application that accesses the AccountManager using checkSignature(). Where in the code should I check the signature? I've already tried to use Binder.getCallingUid( ) to obtain the UID of the calling process inside my own implementation of the AbstractAccountAuthenticator , but it returns 1000 as the system process performs IPC. I need to obtain UID

问题 In a recent project, I want to debug my program in production use state. The production environment is very complicated so I want to debug the program whenever I find a problem. This is what I want to achieve: whenever I want to debug, I will send a kill signal to the program and hopefully pdb debugger will appear. It is something like this: import pdb import signal import time def handler(signal, frame): pdb.set_trace() signal.signal(signal.SIGTERM, handler) a=1 while True: a+=1 time.sleep(1

问题 I'm writing a client/server process on Suse Linux using Posix message queues to communicate, similar to the accepted answer in "How do I use mqueue in a c program on a Linux based system?". When the server dies, it does an mq_close and mq_unlink . However, the client gets no notification of this, so calls to mq_send in the client will continue to work even though the queue has been unlinked. The problem is, when the server is restarted, it tries to create a queue with mq_open with O_CREAT,

问题 I've got a Perl script that starts a background job to print some logging information into a file, executes something, and then finishes. I would like to end the background process when the script is done, but as far as I know, if I use a double fork as below, then waitpid($pid,0) will wait for the background process to finish, instead of killing it, and kill(9,$pid) won't get rid of the background process. Example script: #!/usr/bin/perl use strict; # Do a first general top my $ret = `top -b

问题 It is very weird that I can't seem to make this work. This is my architecture: I have a named pipe which will communicate between a always-running root reader process and multiple application writer processes. The reader process has to be blocking while the writers are nonblocking . Therefore this is what I do in the reader process which will run with root privilege. reader.c #define PIPE_ID "/dev/shm/mypipe" // This function configures named pipe void configure_pipe() { // So that others can

问题 Python provides a signals module and os.kill ; does it have a facility for sigqueue() (real-time signals with attached data)? What are the alternatives? 回答1: You could do it with ctypes >>> from ctypes import * >>> c = cdll.LoadLibrary("libc.so.6") >>> c.sigqueue <_FuncPtr object at 0xb7dbd77c> >>> c.sigqueue(100, 10, 0) -1 >>> You'll have to look up how to make a union in ctypes which I've never done before but I think is possible. 回答2: One alternative, if no one has done it yet, would be to

问题 Newbie question: On Unix, in a program with a parent and some children: - How can the parent alert the children efficiently to do some work.. ? - Or how can the children wait for parent signal to start doing some work? EDIT: This program tries to do a complex computation in parallel, I have already used shared memory as a common workspaces for all children to update results and for data transfer. What I need now is the parent say "start" efficiently to all its children...(called many times)