/**
* @brief call to process any new requests from Erlang
*/
void erlcmd_process(struct erlcmd *handler)
{
ssize_t amount_read = read(STDIN_FILENO, handler->buffer + handler->index, sizeof(handler->buffer) - handler->index);
if (amount_read < 0) {
/* EINTR is ok to get, since we were interrupted by a signal. */
if (errno == EINTR)
return;
/* Everything else is unexpected. */
err(EXIT_FAILURE, "read");
} else if (amount_read == 0) {
/* EOF. Erlang process was terminated. This happens after a release or if there was an error. */
exit(EXIT_SUCCESS);
}
handler->index += amount_read;
for (;;) {
size_t bytes_processed = erlcmd_try_dispatch(handler);
if (bytes_processed == 0) {
/* Only have part of the command to process. */
break;
} else if (handler->index > bytes_processed) {
/* Processed the command and there's more data. */
memmove(handler->buffer, &handler->buffer[bytes_processed], handler->index - bytes_processed);
handler->index -= bytes_processed;
} else {
/* Processed the whole buffer. */
handler->index = 0;
break;
}
}
}
/**
* @brief Call to process any new requests from Erlang
*
* @return 1 if the program should exit gracefully
*/
int erlcmd_process(struct erlcmd *handler)
{
#ifdef __WIN32__
DWORD amount_read;
BOOL rc = GetOverlappedResult(handler->h,
&handler->overlapped,
&amount_read, FALSE);
if (!rc) {
DWORD last_error = GetLastError();
// Check if this was a spurious event.
if (last_error == ERROR_IO_PENDING)
return 0;
// Error - most likely the Erlang port connected to us was closed.
// Tell the caller to exit gracefully.
return 1;
}
ResetEvent(handler->overlapped.hEvent);
#else
ssize_t amount_read = read(STDIN_FILENO, handler->buffer + handler->index, sizeof(handler->buffer) - handler->index);
if (amount_read < 0) {
/* EINTR is ok to get, since we were interrupted by a signal. */
if (errno == EINTR)
return 0;
/* Everything else is unexpected. */
err(EXIT_FAILURE, "read");
} else if (amount_read == 0) {
/* EOF. Erlang process was terminated. This happens after a release or if there was an error. */
return 1;
}
#endif
handler->index += amount_read;
for (;;) {
size_t bytes_processed = erlcmd_try_dispatch(handler);
if (bytes_processed == 0) {
/* Only have part of the command to process. */
break;
} else if (handler->index > bytes_processed) {
/* Processed the command and there's more data. */
memmove(handler->buffer, &handler->buffer[bytes_processed], handler->index - bytes_processed);
handler->index -= bytes_processed;
} else {
/* Processed the whole buffer. */
handler->index = 0;
break;
}
}
#ifdef __WIN32__
start_async_read(handler);
#endif
return 0;
}
