Commit 31b5729

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Added common library file.

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	`1`	`+#include <sys/wait.h>`
	`2`	`+`
	`3`	`+#define EXIT_FAILURE 1`
	`4`	`+`
	`5`	`+void kill_child_handler(int sig)`
	`6`	`+{`
	`7`	`+ int status;`
	`8`	`+ pid_t done = waitpid(-1, // Any child`
	`9`	`+ &status,`
	`10`	`+ 0); // Blocked mode.`
	`11`	`+ if (done == -1)`
	`12`	`+ {`
	`13`	`+ printf("No more child processes.\n");`
	`14`	`+ }`
	`15`	`+ else`
	`16`	`+ {`
	`17`	`+ short isNormalTermination = WIFEXITED(status);`
	`18`	`+ if (!isNormalTermination \|\|`
	`19`	`+ // WEXITSTATUS should be used only if normal termination = true.`
	`20`	`+ (isNormalTermination && WEXITSTATUS(status) != 0))`
	`21`	`+ {`
	`22`	`+ printf("Zombie for PID -- %d failed.\n", done);`
	`23`	`+ exit(EXIT_FAILURE);`
	`24`	`+ }`
	`25`	`+ else`
	`26`	`+ {`
	`27`	`+ printf("Zombie for PID -- %d successfully removed.\n", done);`
	`28`	`+ }`
	`29`	`+ }`
	`30`	`+}`

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