/*
- * Copyright (C) 2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
- * This library is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License, version 2.1 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: LGPL-2.1-only
*
- * This library is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
- * for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#define _LGPL_SOURCE
#include <assert.h>
-#include <errno.h>
+#include <limits.h>
#include <unistd.h>
+#include <common/compat/errno.h>
+
#include "readwrite.h"
/*
* Upon success, they return the "count" received as parameter.
* They can return a negative value if an error occurs.
* If a value lower than the requested "count" is returned, it means an
- * error occured.
+ * error occurred.
* The error can be checked by querying errno.
*/
+LTTNG_HIDDEN
ssize_t lttng_read(int fd, void *buf, size_t count)
{
size_t i = 0;
ssize_t ret;
- assert(fd >= 0);
assert(buf);
+ /*
+ * Deny a read count that can be bigger then the returned value max size.
+ * This makes the function to never return an overflow value.
+ */
+ if (count > SSIZE_MAX) {
+ return -EINVAL;
+ }
+
do {
ret = read(fd, buf + i, count - i);
if (ret < 0) {
}
}
+LTTNG_HIDDEN
ssize_t lttng_write(int fd, const void *buf, size_t count)
{
size_t i = 0;
ssize_t ret;
- assert(fd >= 0);
assert(buf);
+ /*
+ * Deny a write count that can be bigger then the returned value max size.
+ * This makes the function to never return an overflow value.
+ */
+ if (count > SSIZE_MAX) {
+ return -EINVAL;
+ }
+
do {
ret = write(fd, buf + i, count - i);
if (ret < 0) {