updates to articles

OS/C/Week5/q2_opt.c

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+// stdlib import
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// bash utilities import
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+void main () {
+
+	// array declaration
+	char *strings[5];
+	char *string_cpy[5];
+	char temp[100];
+
+	// variables reqd
+	int i,j;
+	pid_t pid;
+	int status;
+
+	// input
+	printf("Enter strings to print: \n");
+	const size_t str_size = 100;
+	for (i = 0; i < 5; i++) {
+		strings[i] = malloc(str_size);
+		string_cpy[i] = malloc(str_size);
+		if (!strings[i] || !string_cpy[i]) {
+			fprintf(stderr, "Memory allocation failed\n");
+			exit(1);
+		}
+		if (fgets(strings[i], str_size, stdin)) {
+			memcpy(string_cpy[i], strings[i], str_size);
+		}
+	}
+
+	// forking
+	pid = fork();
+
+	// child process
+	if (pid == 0) {
+		printf("\n Child Process: \n");
+		for (i = 0; i < 5; i++) {
+			for (j = 0; j < 5 - i - 1; j++) {
+				if (strcmp(strings[j], strings[j + 1]) > 0){
+					strcpy(temp, strings[j]);
+					strcpy(strings[j], strings[j+1]);
+					strcpy(strings[j+1], temp);
+				}
+			}
+		}
+
+
+		for (i = 0; i < 5; i++) {
+			printf("\n Child: %s \n", strings[i]);
+		}
+
+		printf("\n");
+		exit (00);
+
+	// parent process
+	} else if (pid > 0) {
+		wait(&status);
+		printf("\n Parent Process: \n");
+		for (i = 0; i < 5; i++) {
+			printf("\n Parent: %s \n", string_cpy[i]);
+			printf("%d",WEXITSTATUS(status));
+		}
+
+	// exception handling (catchall statement)
+	} else {
+		printf("THE SYSTEM ENCOUNTERED AN ERROR. Please try again later or debug the code. \n");
+	}
+
+}