Merge branch 'fix_Default_offset' into 'master'

Improve default read/write offset

See merge request i4/manycore/emper!78

emper/io.hpp

@@ -219,7 +219,7 @@ inline auto acceptAndWait(int socket, struct sockaddr *address, socklen_t *addre
  *
  * @return Future object which signals the completion of the read request
  */
-inline auto readFile(int fildes, void *buf, size_t nbyte, off_t offset = 0, bool read_all = false)
+inline auto readFile(int fildes, void *buf, size_t nbyte, off_t offset = -1, bool read_all = false)
 		-> std::unique_ptr<Future> {
 	auto future = std::make_unique<ReadFuture>(fildes, buf, nbyte, offset, read_all);
 	future->submit();
@@ -241,7 +241,7 @@ inline auto readFile(int fildes, void *buf, size_t nbyte, off_t offset = 0, bool
  *
  * @return -1 on error, otherwise the number of bytes read
  */
-inline auto readFileAndWait(int fildes, void *buf, size_t nbyte, off_t offset = 0,
+inline auto readFileAndWait(int fildes, void *buf, size_t nbyte, off_t offset = -1,
 														bool read_all = false) -> ssize_t {
 	ReadFuture future(fildes, buf, nbyte, offset, read_all);
 	future.submit();
@@ -266,7 +266,7 @@ inline auto readFileAndWait(int fildes, void *buf, size_t nbyte, off_t offset =
  *
  * @return Future object which signals the completion of the write request
  */
-inline auto writeFile(int fildes, const void *buf, size_t nbyte, off_t offset = 0,
+inline auto writeFile(int fildes, const void *buf, size_t nbyte, off_t offset = -1,
 											bool write_all = true) -> std::unique_ptr<Future> {
 	auto future = std::make_unique<WriteFuture>(fildes, buf, nbyte, offset, write_all);
 	future->submit();
@@ -291,7 +291,7 @@ inline auto writeFile(int fildes, const void *buf, size_t nbyte, off_t offset =
  *
  * @return -1 on error, otherwise the number of bytes written
  */
-inline auto writeFileAndWait(int fildes, const void *buf, size_t nbyte, off_t offset = 0,
+inline auto writeFileAndWait(int fildes, const void *buf, size_t nbyte, off_t offset = -1,
 														 bool write_all = true) -> ssize_t {
 	WriteFuture future(fildes, buf, nbyte, offset, write_all);
 	future.submit();