Kernel: Add isatty syscall

4 files changed, 12 insertions, 7 deletions

diff --git a/kernel/fs/shm.c b/kernel/fs/shm.c
index a77702a..2224cc2 100644
--- a/kernel/fs/shm.c
+++ b/kernel/fs/shm.c
@@ -81,7 +81,7 @@ int shm_open(const char *name, int oflag, mode_t mode) {
       NULL /*stat*/);
 
   vfs_fd_t *fd_ptr;
-  int fd = vfs_create_fd(oflag, mode, inode, &fd_ptr);
+  int fd = vfs_create_fd(oflag, mode, 0/*is_tty*/, inode, &fd_ptr);
   if (-1 == fd) {
     kfree(inode);
     return -EMFILE;
diff --git a/kernel/fs/tmpfs.c b/kernel/fs/tmpfs.c
index 0e82a16..d213005 100644
--- a/kernel/fs/tmpfs.c
+++ b/kernel/fs/tmpfs.c
@@ -52,7 +52,7 @@ void dual_pipe(int fd[2]) {
     assert(inode);
 
     vfs_fd_t *fd_ptr;
-    fd[i] = vfs_create_fd(O_RDWR | O_NONBLOCK, 0, inode, &fd_ptr);
+    fd[i] = vfs_create_fd(O_RDWR | O_NONBLOCK, 0, 0/*is_tty*/, inode, &fd_ptr);
     assert(-1 != fd[i]);
   }
   vfs_inode_t *f_inode = get_current_task()->file_descriptors[fd[0]]->inode;
@@ -78,11 +78,11 @@ void pipe(int fd[2]) {
         0 /*inode_num*/, 0 /*type*/, has_data, can_write, is_open,
         internal_object, 0 /*file_size*/, NULL /*open*/, NULL /*create_file*/,
         tmp_read, tmp_write, tmp_close, NULL /*create_directory*/,
-        NULL /*get_vm_object*/, NULL /*truncate*/, NULL/*stat*/);
+        NULL /*get_vm_object*/, NULL /*truncate*/, NULL /*stat*/);
     assert(inode);
 
     vfs_fd_t *fd_ptr;
-    fd[i] = vfs_create_fd(O_RDWR, 0, inode, &fd_ptr);
+    fd[i] = vfs_create_fd(O_RDWR, 0, 0 /*is_tty*/, inode, &fd_ptr);
     assert(-1 != fd[i]);
   }
   vfs_inode_t *f_inode = get_current_task()->file_descriptors[fd[0]]->inode;
diff --git a/kernel/fs/vfs.c b/kernel/fs/vfs.c
index d0c1b95..d55a2bf 100644
--- a/kernel/fs/vfs.c
+++ b/kernel/fs/vfs.c
@@ -54,7 +54,8 @@ vfs_inode_t *vfs_create_inode(
   return r;
 }
 
-int vfs_create_fd(int flags, int mode, vfs_inode_t *inode, vfs_fd_t **fd) {
+int vfs_create_fd(int flags, int mode, int is_tty, vfs_inode_t *inode,
+                  vfs_fd_t **fd) {
   process_t *p = (process_t *)get_current_task();
   int i;
   for (i = 0; i < 100; i++)
@@ -67,6 +68,7 @@ int vfs_create_fd(int flags, int mode, vfs_inode_t *inode, vfs_fd_t **fd) {
   r->mode = mode;
   r->inode = inode;
   r->reference_count = 1;
+  r->is_tty = is_tty;
   r->offset = 0;
   p->file_descriptors[i] = r;
   if (fd)
@@ -266,7 +268,8 @@ int vfs_open(const char *file, int flags, int mode) {
     return uds_open(resolved_path);
   }
 
-  return vfs_create_fd(flags, mode, inode, NULL);
+  // FIXME: Maybe it is sometimes a TTY?
+  return vfs_create_fd(flags, mode, 0 /*is_tty*/, inode, NULL);
 }
 
 int vfs_close(int fd) {
diff --git a/kernel/fs/vfs.h b/kernel/fs/vfs.h
index b6a3401..76c0a0c 100644
--- a/kernel/fs/vfs.h
+++ b/kernel/fs/vfs.h
@@ -47,6 +47,7 @@ struct vfs_fd {
   size_t offset;
   int flags;
   int mode;
+  int is_tty;
   int reference_count; // Number of usages of this file descriptor,
                        // once it reaches zero then the contents can
                        // be freed.
@@ -84,7 +85,8 @@ vfs_vm_object_t *vfs_get_vm_object(int fd, u64 length, u64 offset);
 int vfs_dup2(int org_fd, int new_fd);
 vfs_inode_t *vfs_internal_open(const char *file);
 int vfs_mkdir(const char *path, int mode);
-int vfs_create_fd(int flags, int mode, vfs_inode_t *inode, vfs_fd_t **fd);
+int vfs_create_fd(int flags, int mode, int is_tty, vfs_inode_t *inode,
+                  vfs_fd_t **fd);
 int vfs_ftruncate(int fd, size_t length);
 int vfs_chdir(const char *path);
 int vfs_fstat(int fd, struct stat *buf);