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C > C on Unix Code Examples

Program that shows how fork system call works

Program that shows how fork system call works

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>

int main(void)
{
        pid_t pid;
	char cwdir_cld[100];
	char cwdir_prt[100];

	if ((pid = fork()) < 0) {
	        perror("fork error");
		exit(1);
	}

	if (pid == 0) {
	  /* 
	   *  Now we are in the childs thread 
	   *  let us issue a chdir syscall :)
	   */
                if(chdir("/tmp") < 0) {
	                perror("chdir error");
		}
		
		/* 
		 * Let us now print the current working directory of the child
		 */
		if (getcwd(cwdir_cld, 100) != NULL) {
		        printf("
Current working directory of the child is : %s", cwdir_cld);
		} else {
		        perror("
getcwd error");
		}
		
	 /* end of the child */
	} else {
	  /* 
	   * Now we are in the parent thread
	   * Let is check the current working directory
	   */
	        if (getcwd(cwdir_prt, 100) != NULL) {
		        printf("
Current working directory of the parent is : %s", cwdir_prt);
		} else {
		        perror("
getcwd error");
		}
	}

        printf("
");
	return(0);
}

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C Program Code Calculate Simple Interest - C code example to input principle amount in some variable say principle and input time in some variable say time. Input rate in some variable say rate. Find simple interest using

Collection of Sorting & Selection Routines - Shellsort, using Shell's (poor) increments. An Internal method for heapsort. i is the index of an item in the heap. Returns the index of the left child. Internal method for heapsort that is

Converting IP Address to its base10 form - Print help and exit with exval. Print version and exit with exval. Output some additional info. Very basic test of ip4 dotted quad address format. Convert address to base 10

Copy one String into Other without library - Scan a string from "left to right", character by character. In each iteration "copy a character" to a new String variable. As soon as source or original string ends, the process of the coping

Implement Two Stacks using Single Array - C Programming code implements two Stacks using a Single Array & Check for Overflow & Underflow. A Stack is a linear data structure in which a data item is inserted and deleted...

C ++ Access Functions and Encapsulation - In C++ language, Encapsulation is achieved using access specifiers. In encapsulation we make all member variables private, provide public "functions" which allow user to work

Exception Handling Multiple Catch in C++ - In C++ code, 'Declare and define' the function test(). Within the try block check whether the value is 'greater than zero' or not. If the value greater than zero 'throw the value' and catch