1.What is Strut in C? -Struct in C is used to visualize the object with attributes. -For example, we can have the object “dog” with attributes as name, breed, age, color. Then, we should declare the dog in struct type as: struct dog { char… Read More
A.Understand of Operations 1. Operation & -The operation & to get the memory location value of a variable. The location where a variable is stored. -The operation $ can use for both pointer and non-pointer variables For example: int a=5; printf(“a is located at $%x.\n”,… Read More
1.#include This variant is used for system header files. It searches for a file named file in a standard list of system directories. 2.#include “file” This variant is used for header files of your own program. It searches for a file named file first in… Read More
Basically, load and unload a C Linux Kernel Module is including steps: A. Load a Module At the location where the C source file is located. execute one by one command: //Compile the C source file >make //Clear the log >dmesg -c //Load the Module… Read More
Here is the sample code to: +read and copy the content of the file into a buffer +create a new file, then copy the content of the buffer into a new file while (1) { int src_fld = open(“C:\test.txt”, O_RDONLY);//return src_fld as unique file handle… Read More
1.Open a file for READ ONLY int src_fld = open(“C:\test.txt”, O_RDONLY);//open function return a unique int as the handle for the file if (src_fld == -1) { printf(“Cannot find test1.txt file.\n”); exit(1); } 2.Create a file and write into int dst_fld = open(“C:\test2.txt”, O_CREAT |… Read More
int main(int argn, char * argv[]) { if (argn == 1) { printf(“Parameter at index 0 is %s\n”, argv[0]); exit(0);//Exit without error } char strOne[1024]; if (argn == 2) { strcpy(strOne, argv[1]); printf(“Parameter at index 1 is %s\n”, strOne); exit(1);//Exit with error } }
1.Copy a String to another String char strOne[1024]; strcpy(strOne,argv[1]);//Copy parameter at index 1 to string strOne 2.Split a String with a Delimiter and take the first part char strOne[1024]; strOne= strtok(“test.txt”, “.”);//The strOne will be “test” 3.Concat Two String char strOne[1024]; strOne = strcat(“test”, “.bak”);//The… Read More
int src_fld;//declare an int variable unsigned char buffer[1024];//declare a char array with size char * src_file_path;//declare a pointer
In this article, we will take a look on how to write a Linux Kernel Shell Script using C/C++ First, we will take a look on the structure of a shell script program. 1.Structure of a C/C++ shell script file For example, we will write… Read More