* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include <unistd.h>
-#include <errno.h>
+#define _LGPL_SOURCE
#include <assert.h>
+#include <errno.h>
+#include <limits.h>
+#include <unistd.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(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(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) {