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Category Archives: operating system
How Linux is Built
[youtube https://www.youtube.com/watch?v=yVpbFMhOAwE?rel=0&w=560&h=315]
htop process monitor
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GNU grep Debug II
commandline session $gdb grep GNU gdb (GDB) 7.4.1-debian Copyright (C) 2012 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type “show copying” and “show warranty” for details. This GDB …
GNU grep Debug
commandline session $gdb grep GNU gdb (GDB) 7.4.1-debian Copyright (C) 2012 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type “show copying” and “show warranty” for details. This GDB …
Using Valgrind to detect Memory Leaks (still reachable)
ABOUT Memory Leak In computer science, a memory leak is a type of resource leak that occurs when a computer program incorrectly manages memory allocations[1] in such a way that memory which is no longer needed is not released. A memory leak may also happen when an object is stored in memory but cannot be …
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Detecting Memory Leaks (leak: + ive)
commandline session $gcc -g leak.c $valgrind –tool=memcheck –leak-check=full ./a.out ==4353== Memcheck, a memory error detector ==4353== Copyright (C) 2002-2012, and GNU GPL’d, by Julian Seward et al. ==4353== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info ==4353== Command: ./a.out ==4353== ==4353== ==4353== HEAP SUMMARY: ==4353== in use at exit: 100 bytes in 1 …
Detecting Memory Leaks II
commandline session $gcc -g -ansi -pedantic -W -Wall algorithm.c algorithm.c: In function ‘main’: algorithm.c:47:5: warning: unused variable ‘value’ [-Wunused-variable] algorithm.c:36:7: warning: unused variable ‘p’ [-Wunused-variable] algorithm.c:35:5: warning: unused variable ‘i’ [-Wunused-variable] algorithm.c:34:14: warning: unused parameter ‘argc’ [-Wunused-parameter] algorithm.c:34:26: warning: unused parameter ‘argv’ [-Wunused-parameter] $valgrind –tool=memcheck –leak-check=full ./a.out ==23555== Memcheck, a memory error detector ==23555== Copyright …
Detecting Memory leaks
commandline session $valgrind –tool=memcheck –leak-check=full ./a.out ==6002== Memcheck, a memory error detector ==6002== Copyright (C) 2002-2012, and GNU GPL’d, by Julian Seward et al. ==6002== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info ==6002== Command: ./a.out ==6002== -31 0 1 2 2 4 100 83 99 782 ==6002== ==6002== HEAP SUMMARY: ==6002== in …
file — determine file type
commandline session $ls faq favicon.ico index.html kernel.css mirrors pub robots.txt $file kernel.css kernel.css: ASCII text $file -l | head Set 0: Binary patterns: Text patterns: Set 1: Binary patterns: Text patterns: Set 0: Binary patterns: Strength = 340 : sc68 Atari ST music [] Strength = 340 : T64 tape Image [] $file -l | …