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##### read

Synopsis:

                int read(int fd, void *buf, unsigned int count);

Request:
  ‘`Fread,fd,bufptr,count`’
Return value:
  On success, the number of bytes read is returned. Zero indicates end of file. If count is zero, read returns zero as well. On error, -1 is returned.
Errors:
  `EBADF`
    fd is not a valid file descriptor or is not open for reading.
  `EFAULT`
    bufptr is an invalid pointer value.
  `EINTR`
    The call was interrupted by the user.