1 files changed, 12 insertions, 4 deletions
diff --git a/kernel/fs/fs.c b/kernel/fs/fs.c
index e0d9205..381f20a 100644
--- a/kernel/fs/fs.c
+++ b/kernel/fs/fs.c
@@ -1,3 +1,4 @@
+#include <errno.h>
 #include <kernel/con.h>
 #include <kernel/fs.h>
 #include <kernel/kernel.h>
@@ -5,16 +6,23 @@
 #include <kernel/tty.h>
 #include <string.h>
 #include <sys/types.h>
+#include <unistd.h>
 
 /* master file table */
 static struct file ftable[NRFILE];
 
-ssize_t sys_read(void *buf, size_t len) {
-  return tty_read(ctask->ctty, buf, len);
+ssize_t sys_read(int fd, void *buf, size_t len) {
+  if(fd == STDIN_FILENO)
+    return tty_read(ctask->ctty, buf, len);
+
+  return -EINVAL;
 }
 
-ssize_t sys_write(void *buf, size_t len) {
-  return tty_write(ctask->ctty, buf, len);
+ssize_t sys_write(int fd, void *buf, size_t len) {
+  if(fd == STDOUT_FILENO || fd == STDERR_FILENO)
+    return tty_write(ctask->ctty, buf, len);
+
+  return -EINVAL;
 }
 
 void fs_init(void) {