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COM Port Programming in Win32
ByEric MaThe control support for the COM port under Win32 can be used to operate the COM port, such as a monitoring and control program for a single-chip microcontroller. Below is an example code related to COM port control: // Open COM1 hCOM=CreateFile( “COM1″,GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL); if (hCOM==INVALID_HANDLE_VALUE) { MessageBox( GetForegroundWindow(),”Can not open the COM port!”,”Operation Failed”,MB_ICONINFORMATION); return;…
How to get the running process’ parent process’ ID in Python?
ByQ AHow to get the running process’ parent process’ ID in Python? In Python, you can get the parent process’ pid by calling os.getppid(): import os ppid = os.getppid() One example: The shell’s pid: $ echo $$ 21779 Start a python REPL and get its parent pid (the shell’s): $ python Python 2.7.5 (default, Nov 6…
How to get the top committers in git?
ByEric MaHow to get the top committers in git? Like in github: But plain text is fine showing number of commits and author names/emails sorted by the number of commits. You may use this command: git log | grep Author | sort | uniq -c | sort -n -r Here, count the number of commits by…
How to use LVM groups with libvirt
ByQ Alibvirt uses files for VM images by default under /var/lib/libvirt/images/. LVM is a convenient tool for managing VM images. How to use LVM groups with libvirt? This post discusses the method to add LVM groups as a storage pool for libvirt: http://ailoo.net/2011/02/use-a-lvm-volume-group-with-libvirt/ For a general introduction of the storage management in libvirt, please check: http://libvirt.org/storage.html…
How to read email in Maildir on Linux?
ByEric MaHow to read email in Maildir on Linux? You can use mutt by: mutt -f /path/to/mail/dir/ Read more: How to convert A4 paper format to read on Kindle 5 What’s wrong with the messages like “UnrecovData 10B8B BadCRC” and “failed command: READ FPDMA QUEUED” on Linux? How to convert the dmesg timestamps to easier to…
How to disable the fastestmirror yum plugin in CentOS 7 Linux?
ByEric MaHow to disable the fastmirror yum plugin in CentOS 7 Linux? The fastestmirror function of yum is provided by the package `yum-plugin-fastestmirror`. However, because `yum` depends on it, the `yum-plugin-fastestmirror` package can not be removed. If you try to remove it, `yum` will report failures like. # yum remove yum-plugin-fastestmirror Loaded plugins: fastestmirror Resolving Dependencies…
