nixio next

splice() still does not work correctly

1 files changed, 91 insertions, 0 deletions

diff --git a/libs/nixio/src/splice.c b/libs/nixio/src/splice.c
new file mode 100644
index 000000000..37849751a
--- /dev/null
+++ b/libs/nixio/src/splice.c
@@ -0,0 +1,91 @@
+/*
+ * nixio - Linux I/O library for lua
+ *
+ *   Copyright (C) 2009 Steven Barth <steven@midlink.org>
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#define _GNU_SOURCE
+
+#include "nixio.h"
+#include <fcntl.h>
+
+/* guess what sucks... */
+#ifdef __UCLIBC__
+#include <unistd.h>
+#include <sys/syscall.h>
+ssize_t splice(int __fdin, __off64_t *__offin, int __fdout,
+        __off64_t *__offout, size_t __len, unsigned int __flags) {
+	return syscall(__NR_splice, __fdin, __offin, __fdout, __offout, __len, __flags);
+}
+#endif
+
+
+/**
+ * Checks whether a flag is set in the table and translates it into a bitmap
+ */
+static void nixio_splice_flags__w(lua_State *L, int *m, int f, const char *t) {
+	lua_pushstring(L, t);
+	lua_rawget(L, -2);
+	if (lua_toboolean(L, -1)) {
+		*m |= f;
+	}
+	lua_pop(L, 1);
+}
+
+/**
+ * Translate integer to poll flags and vice versa
+ */
+static int nixio_splice_flags(lua_State *L) {
+	int flags = 0;
+
+	luaL_checktype(L, 1, LUA_TTABLE);
+	lua_settop(L, 1);
+	nixio_splice_flags__w(L, &flags, SPLICE_F_MOVE, "move");
+	nixio_splice_flags__w(L, &flags, SPLICE_F_NONBLOCK, "nonblock");
+	nixio_splice_flags__w(L, &flags, SPLICE_F_MORE, "more");
+	lua_pushinteger(L, flags);
+
+	return 1;
+}
+
+static int nixio_splice(lua_State *L) {
+	int fd_in = nixio__checkfd(L, 1);
+	int fd_out = nixio__checkfd(L, 2);
+	size_t len = luaL_checkinteger(L, 3);
+	int flags = luaL_optinteger(L, 4, 0);
+
+
+	long spliced = splice(fd_in, NULL, fd_out, NULL, len, flags);
+
+	if (spliced < 0) {
+		return nixio__perror(L);
+	}
+
+	lua_pushnumber(L, spliced);
+	return 1;
+}
+
+
+
+/* module table */
+static const luaL_reg R[] = {
+	{"splice",			nixio_splice},
+	{"splice_flags",	nixio_splice_flags},
+	{NULL,			NULL}
+};
+
+void nixio_open_splice(lua_State *L) {
+	luaL_register(L, NULL, R);
+}