#include <io.h>
namespace ::io
{
void writeData( int fd, const void* pData, size_t size)
throws int;
size_t readData ( int fd, void* pBuffer, size_t nBytes)
throws int;
}
Provides encapsulations of the read(2) and write(2) system calls that transparently handles the various edge cases that may cause premature I/O termination.
void writeData( int fd, const void* pData, size_t size)
throws int;
Writes size bytes
of data pointed to by pData
to the file descriptor fd. When this
function returns either all of the bytes have been writtren or
an int exception has been thrown whose
value is errno at the time the
exception was thrown.
size_t readData ( int fd, void* pBuffer, size_t nBytes)
throws int;
Reads at most nBytes of
data from the file descriptor fd
into the buffer pointed to by pBuffer.
Returns the number of bytes actually written.
When this function returns one of the following is true:
All nBytes of data have been read.
The return value is less than nBytes.
This means an end of file condition was encountered when
reading the data. The return value is the nuber of bytes
actually transferred.
The function has thrown an int exception
indicating an error of some sort. The value of the
integer thrown is errno at the
time the error was detected.