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Tweet This is my first article in what I'm hoping will be a series of articles on system programming for POSIX compliant operating systems with focus on Linux. In this series my goal is to go trough basics of Linux system programming from the easiest topics like open file, read file and file write to a bit more complicated things like Berkeley sockets network programming.
So lets get started with environment setup and an example of program that copies source file into destination file using POSIX API system calls to demonstrate openread and write system calls on Linux operating system.
Configuring your environment I'll use my trustworthy Ubuntu Linux operating system but you can actually use any POSIX compliant operating system, the only difference will probably be that you will need to configure your environment differently.
What we need to begin with Linux system programming is gcc compiler with related packages and POSIX related man pages. So here's how to install this packages on Ubuntu based operating system: Later we will probably need some more libraries but we will install them when necessary.
You should open it's man page if you haven't already done so using man 2 open command and read trough basics 2 is manual section number, use man man to read more about integrated manual section numbers. In the following example we also use read and write system calls to copy from one file descriptor to the other both descriptors returned by open system call so it is wise to open their man pages as well man 2 read and man 2 write.
So here's the example code for program that copies input file passed as first argument into output file passed as second argument: First thing we must do is to include necessary header files. Man page of every system call tells you what header files you need to include to be able to use this system call.
Second we will define constant we will use to define size of our buffer in bytes. Smaller buffer size will make our copy process longer but it will save memory.
In case of error we use perror man 3 perror to print relatively user friendly error message. Now we are ready to start copy process. We run read and write inside loop because source file might be bigger than our buffer to copy from one file into another.
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Arguments x. An R object.. destination_frame. A string with the desired name for the H2OFrame.
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These are updated through a mobile app that uses plumber API calls into R endpoints.