* io.c: Arrange for input and output on a file descriptor to be queued.
*
* Known contributors to this file:
- * Doug Hay, 1998
- * Steve McClure, 1998
- * Ron Koenderink, 2009
+ * Doug Hay, 1998
+ * Steve McClure, 1998
+ * Markus Armbruster, 2004-2012
+ * Ron Koenderink, 2009
*/
/*
void
io_close(struct iop *iop)
{
-
+ char buf[IO_BUFSIZE];
+ int ret;
+
+ while (io_output(iop, 1) > 0) ;
+ shutdown(iop->fd, SHUT_WR);
+ while (empth_select(iop->fd, EMPTH_FD_READ, &iop->input_timeout) > 0) {
+ ret = read(iop->fd, buf, sizeof(buf));
+ if (ret <= 0)
+ break;
+ }
if (iop->input)
ioq_destroy(iop->input);
if (iop->output)
/*
* Return number of bytes read on success, zero on timeout, early
- * wakeup or EOF, -1 on error, with errno set appropriately. In
- * particular, return -1 with errno set to EAGAIN or EWOULDBLOCK when
- * no data is available for non-blocking input (WAITFORINPUT false).
+ * wakeup or EOF, -1 on error. In particular, return 0 when no data
+ * is available for non-blocking input (WAITFORINPUT false).
* Use io_eof() to distinguish timeout and early wakeup from EOF.
*/
int
int cc;
int res;
- /* Not a read IOP */
- if ((iop->flags & IO_READ) == 0) {
- errno = EBADF;
+ if ((iop->flags & IO_READ) == 0)
return -1;
- }
- /* IOP is markes as in error. */
- if (iop->flags & IO_ERROR) {
- errno = EBADF;
+ if (iop->flags & IO_ERROR)
return -1;
- }
+ if (iop->flags & IO_EOF)
+ return 0;
+
/* Wait for the file to have input. */
if (waitforinput) {
res = empth_select(iop->fd, EMPTH_FD_READ, &iop->input_timeout);
/* Do the actual read. */
cc = read(iop->fd, buf, sizeof(buf));
if (cc < 0) {
- if (errno != EAGAIN && errno != EWOULDBLOCK)
- /* Some form of file error occurred... */
- iop->flags |= IO_ERROR;
+ if (errno == EAGAIN || errno == EWOULDBLOCK)
+ return 0;
+ iop->flags |= IO_ERROR;
return -1;
}
if (wait)
ef_make_stale();
- if (!ioq_qsize(iop->output))
- return 0;
-
if ((iop->flags & IO_WRITE) == 0)
return -1;
if (iop->flags & IO_ERROR)
return -1;
+ if (!ioq_qsize(iop->output))
+ return 0;
+
if (wait) {
res = empth_select(iop->fd, EMPTH_FD_WRITE, NULL);
if (res == 0)
return io_output(iop, wait);
}
-
int
io_peek(struct iop *iop, char *buf, int nbytes)
{
return iop->flags & IO_EOF;
}
+/*
+ * Discard IOP's buffered input and set its EOF flag.
+ * No more input can be read from IOP.
+ */
+void
+io_set_eof(struct iop *iop)
+{
+ ioq_drain(iop->input);
+ iop->flags |= IO_EOF;
+}
+
int
io_fileno(struct iop *iop)
{