devman: isseekable()

src/sys/devman.c

@@ -56,6 +56,16 @@ int devman_isatty(int dev){
 	
 }
 
+int devman_isseekable(int dev, size_t* max){
+
+        if(major(dev) > highestmajor)
+                return ENOTTY;
+
+        return majorcalls[major(dev)]->isseekable(minor(dev), max);
+
+}
+
+
 void devman_init(){
 	
 	devfs_init();

src/sys/pseudodevs/full.c

@@ -17,8 +17,13 @@ static int isatty(int minor){
 	return ENOTTY;
 }
 
+static int isseekable(int minor, size_t* max){
+        *max = ~(size_t)0;
+        return 0;
+}
+
 static devcalls calls = {
-	read, write, isatty
+	read, write, isatty, isseekable
 };
 
 void fulldev_init(){

src/sys/pseudodevs/null.c

@@ -16,8 +16,13 @@ static int isatty(int minor){
 	return ENOTTY;
 }
 
+static int isseekable(int minor, size_t* max){
+        *max = ~(size_t)0;
+        return 0;
+}
+
 static devcalls calls = {
-	read, write, isatty
+	read, write, isatty, isseekable
 };
 
 void nulldev_init(){

src/sys/pseudodevs/zero.c

@@ -17,8 +17,13 @@ static int isatty(int minor){
 	return ENOTTY;
 }
 
+static int isseekable(int minor, size_t* max){
+	*max = ~(size_t)0;
+	return 0;
+}
+
 static devcalls calls = {
-	read, write, isatty
+	read, write, isatty, isseekable
 };
 
 void zerodev_init(){