add function reserve

V1/switch.c

@@ -7,9 +7,32 @@
  * 
  * */
 
-//Source: http://elinux.org/RPi_GPIO_Code_Samples:
-#define BCM2837_PERIPHERIAL_BASE 0x3F000000
-#define GPIO_BASE (BCM2837_PERIPHERIAL_BASE + 0x3F000000) 
+#include <stdio.h>
+#include <unistd.h>
+
+int reserve(char gpioPort)
+{
+	int fd;
+	char buffer[2];
+	
+	strcpy(buffer, gpioPort + "\n");		
+
+	if((fd=open("/sys/class/gpio/export", O_RDWR | O_CREAT | O_TRUNC) == -1) {
+		perror(NULL);
+		return EXIT_FAILURE;
+	}
+
+	if(write(fd, &buffer, sizeof(buffer)) == -1) {
+		perror("Cannot write into file");
+		return EXIT_FAILURE;			
+	} 	
+	printf("Success");
+	return EXIT_SUCCESS;	
+}
 
 
+int main()
+{
   
+  return 0;
+}