5 files changed, 38 insertions, 0 deletions
diff --git a/src/init/main.c b/src/init/main.c
index 0c5f034..7c1c882 100644
--- a/src/init/main.c
+++ b/src/init/main.c
@@ -1,4 +1,5 @@
 #include <kernel/syscalls.h>
+#include <shared/magic.h>
 #include <stdint.h>
 
 // takes a cstring and copies it right before a page boundary
@@ -24,6 +25,10 @@ int main() {
 			multipageify("/some/where/file"),
 			      sizeof("/some/where/file") - 1);
 
+	_syscall_fd_write(FD_STDOUT, "fd test ", 8);
+	_syscall_fd_close(FD_STDOUT);
+	_syscall_fd_write(FD_STDOUT, "fd test ", 8); // should fail
+
 	_syscall_exit("bye from init! ",
 	       sizeof("bye from init! ") - 1);
 }
diff --git a/src/kernel/fd.c b/src/kernel/fd.c
index 7d448eb..e99fb7d 100644
--- a/src/kernel/fd.c
+++ b/src/kernel/fd.c
@@ -1,12 +1,39 @@
 #include <kernel/fd.h>
+#include <kernel/mem.h>
 #include <kernel/panic.h>
 #include <kernel/proc.h>
 
+static int fdop_special_tty(enum fdop fdop, struct fd *fd, void *ptr, size_t len);
+
 int fdop_dispatch(enum fdop fdop, struct fd *fd, void *ptr, size_t len) {
 	switch(fd->type) {
 		case FD_EMPTY:
 			return -1;
+		case FD_SPECIAL_TTY:
+			return fdop_special_tty(fdop, fd, ptr, len);
 		default:
 			panic();
 	}
 }
+
+static int fdop_special_tty(enum fdop fdop, struct fd *fd, void *ptr, size_t len) {
+	switch(fdop) {
+		case FDOP_READ:
+			return -1; // input not implemented yet
+
+		case FDOP_WRITE: {
+			 struct virt_iter iter;
+			 virt_iter_new(&iter, (void*)ptr, len,
+					 process_current->pages, true, false);
+			 while (virt_iter_next(&iter))
+				 tty_write(iter.frag, iter.frag_len);
+			 return iter.prior;
+		}
+
+		case FDOP_CLOSE:
+			fd->type = FD_EMPTY;
+			return 0;
+
+		default: panic();
+	}
+}
diff --git a/src/kernel/fd.h b/src/kernel/fd.h
index 7f7cbdd..6950b9b 100644
--- a/src/kernel/fd.h
+++ b/src/kernel/fd.h
@@ -7,6 +7,7 @@ typedef int fd_t; // TODO duplicated in syscalls.h
 
 enum fd_type {
 	FD_EMPTY,
+	FD_SPECIAL_TTY,
 };
 
 struct fd {
diff --git a/src/kernel/proc.c b/src/kernel/proc.c
index 4c278e6..15e1ef9 100644
--- a/src/kernel/proc.c
+++ b/src/kernel/proc.c
@@ -3,6 +3,7 @@
 #include <kernel/panic.h>
 #include <kernel/proc.h>
 #include <kernel/util.h>
+#include <shared/magic.h>
 #include <stdint.h>
 
 struct process *process_first;
@@ -23,6 +24,7 @@ struct process *process_seed() {
 
 	for (int i = 0; i < FD_MAX; i++)
 		proc->fds[i].type = FD_EMPTY;
+	proc->fds[FD_STDOUT].type = FD_SPECIAL_TTY;
 
 	// map the stack to the last page in memory
 	pagedir_map(proc->pages, (void*)~PAGE_MASK, page_alloc(1), true, true);
diff --git a/src/shared/magic.h b/src/shared/magic.h
new file mode 100644
index 0000000..cf126d7
--- /dev/null
+++ b/src/shared/magic.h
@@ -0,0 +1,3 @@
+#pragma once
+
+#define FD_STDOUT 0