From 1fc2d9c88af77c3af81b6bd461e6b019b97d2dbb Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sat, 20 Jul 2024 23:17:36 +0200
Subject: *: moving files

---
 src/kernel/handle.h      |  1 +
 src/kernel/syscalls.c    | 32 ++++++++++++++++++++++++++++++++
 src/kernel/vfs/request.c |  1 +
 src/kernel/vfs/request.h |  4 +---
 4 files changed, 35 insertions(+), 3 deletions(-)

(limited to 'src/kernel')

diff --git a/src/kernel/handle.h b/src/kernel/handle.h
index af9d45a..abbfa68 100644
--- a/src/kernel/handle.h
+++ b/src/kernel/handle.h
@@ -19,6 +19,7 @@ struct Handle {
 	enum handle_type type;
 	VfsBackend *backend; /* HANDLE_FILE | HANDLE_FS_FRONT */
 	void __user *file_id; /* only applicable to HANDLE_FILE */
+	// TODO store flags instead
 	bool readable, writeable; /* HANDLE_FILE | HANDLE_PIPE */
 	VfsReq *req; /* HANDLE_FS_REQ */
 	struct {
diff --git a/src/kernel/syscalls.c b/src/kernel/syscalls.c
index 3fc09fa..23a8883 100644
--- a/src/kernel/syscalls.c
+++ b/src/kernel/syscalls.c
@@ -456,6 +456,37 @@ hid_t _sys_getnull(int flags) {
 	SYSCALL_RETURN((0 <= hid) ? hid : -EMFILE);
 }
 
+long _sys_duplex(hid_t from, hid_t to, int flags) {
+	if ((flags & ~DUPLEX_REMOVE) != 0) {
+		SYSCALL_RETURN(-ENOSYS);
+	}
+
+	Handle *fromh = hs_get(proc_cur->hs, from);
+	Handle *toh   = hs_get(proc_cur->hs, to);
+	if (fromh == NULL || toh == NULL) {
+		SYSCALL_RETURN(-EBADF);
+	}
+	if (fromh->type != HANDLE_FILE || toh->type != HANDLE_FILE) {
+		SYSCALL_RETURN(-ENOSYS);
+	}
+	if (fromh->backend != toh->backend) {
+		SYSCALL_RETURN(-ENOSYS);
+	}
+	if (!fromh->readable || !fromh->writeable || !toh->writeable) {
+		SYSCALL_RETURN(-EACCES);
+	}
+
+	vfsreq_dispatchcopy((VfsReq) {
+		.type = VFSOP_DUPLEX,
+		.id = fromh->file_id,
+		.id2 = toh->file_id,
+		.flags = flags,
+		.caller = proc_cur,
+		.backend = fromh->backend,
+	});
+	return -1; // dummy
+}
+
 long _sys_execbuf(void __user *ubuf, size_t len) {
 	if (len == 0) SYSCALL_RETURN(0);
 	static_assert(EXECBUF_MAX_LEN <= KMALLOC_MAX);
@@ -512,6 +543,7 @@ long _syscall(long num, long a, long b, long c, long d, long e) {
 		break; case _SYS_GETPROCFS:	_sys_getprocfs(a);
 		break; case _SYS_TIME:	_sys_time(a);
 		break; case _SYS_GETNULL:	_sys_getnull(a);
+		break; case _SYS_DUPLEX:	_sys_duplex(a, b, c);
 		break; case _SYS_EXECBUF:	_sys_execbuf((userptr_t)a, b);
 		break; case _SYS_DEBUG_KLOG:	_sys_debug_klog((userptr_t)a, b);
 		break;
diff --git a/src/kernel/vfs/request.c b/src/kernel/vfs/request.c
index 92b904f..3f6fda7 100644
--- a/src/kernel/vfs/request.c
+++ b/src/kernel/vfs/request.c
@@ -166,6 +166,7 @@ vfsback_useraccept(VfsReq *req)
 	res.len      = len;
 	res.capacity = req->output.len;
 	res.id       = req->id;
+	res.id2      = req->id2;
 	res.offset   = req->offset;
 	res.flags    = req->flags;
 	res.op       = req->type;
diff --git a/src/kernel/vfs/request.h b/src/kernel/vfs/request.h
index 45ec687..d6facfd 100644
--- a/src/kernel/vfs/request.h
+++ b/src/kernel/vfs/request.h
@@ -50,9 +50,7 @@ struct VfsReq {
 		size_t len;
 	} output;
 
-	// TODO why doesn't this just have a reference to the handle?
-
-	void __user *id; // handle.file.id
+	void __user *id, *id2; // handle.file.id
 	long offset;
 	int flags;
 
-- 
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