/**
* Use JikesRVM's internal read function - the fast way.
*
* @param fd File descriptor
* @param dst Destination buffer
* @param position Starting offset in the buffer
* @param len Number of bytes to read
* @return Number of bytes read, or -1 for end of file.
* @throws IOException
*/
private static int read(int fd, byte[] dst, int position, int len) throws IOException {
if (VM.VerifyAssertions) VM._assert(MemoryManager.willNeverMove(dst));
int bytes = FileSystem.readBytes(fd, dst, position, len);
if (bytes < 0) {
throw new IOException("Error code " + Integer.toString(bytes));
}
if (bytes == 0) {
bytes = -1;
}
return bytes;
}
