daemon

问题 I have a Python program that reads some parameters from an Arduino and stores it in a database. The serial port is set up and used like this: ser = serial.Serial(port=port, baudrate=9600) ser.write('*') while 1 : ser.write('*') out = '' # Let's wait one second before reading output (let's give device time to answer). time.sleep(1) while ser.inWaiting() > 0: out += ser.read(1) if out != '': etc ... handling data (The Arduino is set up so when it receives a star, it sends back a data string.) I

问题 I am using python-daemon in my code that has print statements in it. I want to send them to a file so I ran the following: python server.py >> log.out However, nothing goes in log.out . Can anyone tell me what I need to do? Thanks. 回答1: The DaemonContext object allows redirecting stdout/stderr/stdin when you create the object. For example: import os import daemon if __name__ == '__main__': here = os.path.dirname(os.path.abspath(__file__)) out = open('checking_print.log', 'w+') with daemon

问题 I have a launch daemon which I want to ask for status information from a user app. I implemented a client-server model (with the daemon as server) using unix sockets as described here: OS X - Communication between launch daemon and launch agent In fact it works well, when I run the daemon as a user process (for debugging), but it will fail when it is actually launched as root. I have read the TN on Daemons and Agents and the Daemon & Services Programming Guide. However, I could not find

问题 The issue is similar to this: Warning: the '-d' option with a directory destination is ignored because '-module' is specified but with -Xbuild-file instead of -module : warning: the '-d' option with a directory destination is ignored because '-Xbuild-file' is specified EXAMPLE: 03:00:44 AM: Executing task 'compileKotlin'... > Task :discoverMainScriptsExtensions > Task :compileKotlin Could not perform incremental compilation: Could not connect to Kotlin compile daemon Could not connect to

问题 The issue is similar to this: Warning: the '-d' option with a directory destination is ignored because '-module' is specified but with -Xbuild-file instead of -module : warning: the '-d' option with a directory destination is ignored because '-Xbuild-file' is specified EXAMPLE: 03:00:44 AM: Executing task 'compileKotlin'... > Task :discoverMainScriptsExtensions > Task :compileKotlin Could not perform incremental compilation: Could not connect to Kotlin compile daemon Could not connect to

问题 I'm trying right now to create separate user for jenkins on Mac Os and run it with this user. I've created a new user: # Create the group sudo dscl . create /Groups/jenkins sudo dscl . create /Groups/jenkins PrimaryGroupID 300 # Create the user sudo dscl . create /Users/jenkins sudo dscl . create /Users/jenkins PrimaryGroupID 300 sudo dscl . create /Users/jenkins UniqueID 300 sudo dscl . create /Users/jenkins UserShell /bin/bash # Set the users pasword sudo dscl . passwd /Users/jenkins

问题 Besides running $ killall -9 beam.smp , how can I kill an Erlang node programmatically when I know its -sname ? If I don't want the heartbeat monitor to restart the process, how can I ensure that whatever answer is given for the above question will also kill the heartbeat? Is there a decent guide to deploying Erlang as a daemon? 回答1: kill and killall with -9 is almost always wrong . You can quite easily ask the remote node to exit using: rpc:call(RemoteNode, init, stop, []). I don't know

问题 Struggling to try and get a python daemon to work using Python 3.3.4. Im using the latest version of the python-daemon-3K from PyPi i.e. 1.5.8 Starting point is the following code found How do you create a daemon in Python? code i believe is 2.x Python. import time from daemon import runner class App(): def __init__(self): self.stdin_path = '/dev/null' self.stdout_path = '/dev/tty' self.stderr_path = '/dev/tty' self.pidfile_path = '/tmp/foo.pid' self.pidfile_timeout = 5 def run(self): while

问题 I understand that a zombie is created when a process doesn't clean-up well (its resources aren't reclaimed/reaped). After calling fork() to create a new process, the parent should always call waitpid on that process to clean it up. I also have learned that a daemon is created by forking a child that was itself created by fork, and then letting the child die. Apparently the init process (pid #1) in UNIX would take custody of the process once you do this. What I want to know is - as far as I

问题 I need to make a library in which I will have synchronous and asynchronous methods in it. executeSynchronous() - waits until I have a result, returns the result. executeAsynchronous() - returns a Future immediately which can be processed after other things are done, if needed. Core Logic of my Library The customer will use our library and they will call it by passing DataKey builder object. We will then construct a URL by using that DataKey object and make a HTTP client call to that URL by