isatty syscall

src/sys/syscalls/isatty.c

@@ -0,0 +1,38 @@
+#include <kernel/syscalls.h>
+#include <kernel/fd.h>
+#include <kernel/vfs.h>
+#include <arch/cls.h>
+#include <kernel/sched.h>
+#include <arch/spinlock.h>
+
+syscallret syscall_isatty(int ifd){
+	
+	syscallret retv;
+        retv.ret = -1;
+	
+	proc_t* proc = arch_getcls()->thread->proc;
+
+        fd_t* fd = proc->fds + ifd;
+
+        spinlock_acquire(&proc->fdlock);
+        
+	if(proc->fdcount <= ifd || fd->node == NULL){
+                spinlock_release(&proc->fdlock);
+                retv.errno = EBADF;
+                return retv;
+        }
+
+        spinlock_acquire(&fd->lock);
+        spinlock_release(&proc->fdlock);
+
+	int ret = vfs_isatty(fd->node);
+	
+	retv.errno = ret;
+
+	retv.ret = retv.errno == ENOTTY ? 0 : 1;
+
+	spinlock_release(&fd->lock);
+
+	return retv;
+	
+}