I am working on x86_64 machine. My linux kernel is also 64 bit kernel. As there are different ways to implement a system call (int 80, syscall, sysenter), i wanted to know what type of system call my machine is using. I am newbie to linux. I have written a demo program. getpid() does one system call. Can anyb…
Tag: linux
Converting jiffies to milli seconds
How do I manually convert jiffies to milliseconds and vice versa in Linux? I know kernel 2.6 has a function for this, but I’m working on 2.4 (homework) and though I looked at the code it uses lots of macro constants which I have no idea if they’re defined in 2.4. Answer As a previous answer said, …
How to install the program depending on libstdc++ library
My program is written in C++, using GCC on Ubuntu 9.10 64 bit. If depends on /usr/lib64/libstdc++.so.6 which actually points to /usr/lib64/libstdc++.so.6.0.13. Now I copy this program to virgin Ubuntu 7.04 system and try to run it. It doesn’t run, as expected. Then I add to the program directory the fol…
How do I get Ctrl-Backspace to delete a word in vim within gnome-terminal?
I’d like Ctrl-Backspace to delete the current word in vim insert mode. From within xterm I can pull this off via but in gnome-terminal I cannot figure out a way to make it happen. When in vim insert mode, if I type control-v and then press backspace, I get ^H in xterm, and ^? in gnome-terminal. Unfortun…
The conventional location for storing my Java libraries and applications in UNIX based systems
I usually store the Java applications and JAR files that I download from the Web in the ~/Java folder on my computer (an OS X machine). I have been doing this since the days when I was a Windows user. However I think in UNIX based systems user local apps are conventionally stored in another directory. I have …
Parsing result of Diff in Shell Script
I want to compare two files and see if they are the same or not in my shell script, my way is: Basically, if they are the same ${diff_output} should contain nothing and the above test would evaluate to true. But when I run my script, it says [: too many arguments On the if [….] line. Any ideas? Answer
How to tell binary from text files in linux
The linux file command does a very good job in recognising file types and gives very fine-grained results. The diff tool is able to tell binary files from text files, producing a different output. Is there a way to tell binary files form text files? All I want is a yes/no answer whether a given file is binary…
Installing a Python program on Linux
I wrote a Python program. I would like to add to it an installation script that will set up everything necessary – like desktop icon, entry in the menu, home directory file, etc. I’m working on Linux (ubuntu). When a Python program is installed, what needs to happen in general? I know that it prob…
How to debug problems in Linux kernel module `init()`?
I am using remote (k)gdb to debug a problem in a module that causes a panic when loaded e.g. when init() is called. The stack trace just shows that do_one_initcall(mod->init) causes the crash. In order to get the symbol file loaded in the gdb, I need to get the address of the module text section, and to ge…
How does fork() return for child process
I know that fork() returns differently for the child and parent processes, but I’m unable to find information on how this happens. How does the child process receive the return value 0 from fork? And what is the difference in regards to the call stack? As I understand it, for the parent it goes somethin…