syscalls: accept connect listen

kernel-src/sys/syscalls/accept.c

@@ -0,0 +1,66 @@
+#include <kernel/syscalls.h>
+#include <kernel/abi.h>
+#include <kernel/sock.h>
+#include <errno.h>
+
+syscallret_t syscall_accept(context_t *, int oldfd, abisockaddr_t *abisockaddr, size_t *addrlen, int acceptflags) {
+	syscallret_t ret = {
+		.ret = -1
+	};
+
+	file_t *oldfile = fd_get(oldfd);
+	if (oldfile == NULL) {
+		ret.errno = EBADF;
+		return ret;
+	}
+
+	if (oldfile->vnode->type != V_TYPE_SOCKET) {
+		ret.errno = ENOTSOCK;
+		goto cleanup;
+	}
+
+	socket_t *server = SOCKFS_SOCKET_FROM_NODE(oldfile->vnode);
+
+	socket_t *client = socket_create(server->type);
+	if (client == NULL) {
+		ret.errno = ENOMEM;
+		goto cleanup;
+	}
+
+	vnode_t *vnode;
+	ret.errno = sockfs_newsocket(&vnode, client);
+	if (ret.errno) {
+		client->ops->destroy(client);
+		goto cleanup;
+	}
+
+	sockaddr_t addr;
+	ret.errno = server->ops->accept(server, client, &addr, fileflagstovnodeflags(oldfile->flags));
+	if (ret.errno) {
+		// socket gets deleted by node cleanup
+		VOP_RELEASE(vnode);
+		goto cleanup;
+	}
+
+	file_t *newfile;
+	int newfd;
+	
+	ret.errno = fd_new(0, &newfile, &newfd);
+	if (ret.errno) {
+		// socket gets deleted by node cleanup
+		VOP_RELEASE(vnode);
+		goto cleanup;
+	}
+
+	newfile->vnode = vnode;
+	newfile->flags = FILE_READ | FILE_WRITE | (acceptflags & (O_CLOEXEC | O_NONBLOCK));
+	newfile->offset = 0;
+	newfile->mode = 0777;
+
+	ret.ret = newfd;
+
+	cleanup:
+	fd_release(oldfile);
+
+	return ret;
+}