primera funcion prototype

main.c

@@ -1,20 +1,21 @@
+//Leonardo Mendoza 26-sep-2026
 #include <stdio.h>
 #include <fcntl.h>
 #include <unistd.h>
+#include <string.h>
+
+//Prototypes
+int gpio_export(const char *gpio);
+int gpio_direction(int gpio, const char *direction);
+int gpio_write(int gpio, int value);
+
 
 int main(int argc, char *argv[])
 {
-	int fd;
-	// EXPORT
-	fd = open("/sys/class/gpio/chip0/export", O_WRONLY);
-	if(fd<0)
-	{
-		perror("Error opening GPIO export path");
-		return -1;
-	}
+	char pin[] = "17";
+	gpio_export(pin);
 
-	write(fd, "17", 2);
-	close(fd);
+	int fd;
 	// DIRECTION	
 	fd = open("/sys/class/gpio/chip0/gpio17/direction", O_WRONLY);
 	if(fd<0)
@@ -76,3 +77,20 @@ int main(int argc, char *argv[])
 
 	return 0;
 }
+
+//Full functions
+int gpio_export(const char *gpio)
+{
+    int fd;
+	// EXPORT
+	fd = open("/sys/class/gpio/chip0/export", O_WRONLY);
+	if(fd<0)
+	{
+		perror("Error opening GPIO export path");
+		return -1;
+	}
+	write(fd, gpio, strlen(gpio));
+	close(fd);
+	return 0;
+}
+