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/* $OpenBSD: mio.c,v 1.21 2018/09/19 14:01:52 miko Exp $ */
/*
* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/time.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "debug.h"
#include "mio_priv.h"
struct mio_hdl *
mio_open(const char *str, unsigned int mode, int nbio)
{
static char portany[] = MIO_PORTANY;
struct mio_hdl *hdl;
#ifdef DEBUG
_sndio_debug_init();
#endif
if ((mode & (MIO_OUT | MIO_IN)) == 0)
return NULL;
if (str == NULL) /* backward compat */
str = portany;
if (strcmp(str, portany) == 0 && !issetugid()) {
str = getenv("MIDIDEVICE");
if (str == NULL)
str = portany;
}
if (strcmp(str, portany) == 0) {
hdl = _mio_aucat_open("midithru/0", mode, nbio);
if (hdl != NULL)
return hdl;
return _mio_rmidi_open("rmidi/0", mode, nbio);
}
if (_sndio_parsetype(str, "snd") ||
_sndio_parsetype(str, "midithru") ||
_sndio_parsetype(str, "midi"))
return _mio_aucat_open(str, mode, nbio);
if (_sndio_parsetype(str, "rmidi"))
return _mio_rmidi_open(str, mode, nbio);
DPRINTF("mio_open: %s: unknown device type\n", str);
return NULL;
}
void
_mio_create(struct mio_hdl *hdl, struct mio_ops *ops,
unsigned int mode, int nbio)
{
hdl->ops = ops;
hdl->mode = mode;
hdl->nbio = nbio;
hdl->eof = 0;
}
void
mio_close(struct mio_hdl *hdl)
{
hdl->ops->close(hdl);
}
static int
mio_psleep(struct mio_hdl *hdl, int event)
{
struct pollfd pfd[MIO_MAXNFDS];
int revents;
int nfds;
nfds = mio_nfds(hdl);
if (nfds > MIO_MAXNFDS) {
DPRINTF("mio_psleep: %d: too many descriptors\n", nfds);
hdl->eof = 1;
return 0;
}
for (;;) {
nfds = mio_pollfd(hdl, pfd, event);
while (poll(pfd, nfds, -1) < 0) {
if (errno == EINTR)
continue;
DPERROR("mio_psleep: poll");
hdl->eof = 1;
return 0;
}
revents = mio_revents(hdl, pfd);
if (revents & POLLHUP) {
DPRINTF("mio_psleep: hang-up\n");
return 0;
}
if (revents & event)
break;
}
return 1;
}
size_t
mio_read(struct mio_hdl *hdl, void *buf, size_t len)
{
unsigned int n;
char *data = buf;
size_t todo = len;
if (hdl->eof) {
DPRINTF("mio_read: eof\n");
return 0;
}
if (!(hdl->mode & MIO_IN)) {
DPRINTF("mio_read: not input device\n");
hdl->eof = 1;
return 0;
}
if (len == 0) {
DPRINTF("mio_read: zero length read ignored\n");
return 0;
}
while (todo > 0) {
n = hdl->ops->read(hdl, data, todo);
if (n == 0 && hdl->eof)
break;
data += n;
todo -= n;
if (n > 0 || hdl->nbio)
break;
if (!mio_psleep(hdl, POLLIN))
break;
}
return len - todo;
}
size_t
mio_write(struct mio_hdl *hdl, const void *buf, size_t len)
{
unsigned int n;
const unsigned char *data = buf;
size_t todo = len;
if (hdl->eof) {
DPRINTF("mio_write: eof\n");
return 0;
}
if (!(hdl->mode & MIO_OUT)) {
DPRINTF("mio_write: not output device\n");
hdl->eof = 1;
return 0;
}
if (len == 0) {
DPRINTF("mio_write: zero length write ignored\n");
return 0;
}
if (todo == 0) {
DPRINTF("mio_write: zero length write ignored\n");
return 0;
}
while (todo > 0) {
n = hdl->ops->write(hdl, data, todo);
if (n == 0) {
if (hdl->nbio || hdl->eof)
break;
if (!mio_psleep(hdl, POLLOUT))
break;
continue;
}
data += n;
todo -= n;
}
return len - todo;
}
int
mio_nfds(struct mio_hdl *hdl)
{
return hdl->ops->nfds(hdl);
}
int
mio_pollfd(struct mio_hdl *hdl, struct pollfd *pfd, int events)
{
if (hdl->eof)
return 0;
return hdl->ops->pollfd(hdl, pfd, events);
}
int
mio_revents(struct mio_hdl *hdl, struct pollfd *pfd)
{
if (hdl->eof)
return POLLHUP;
return hdl->ops->revents(hdl, pfd);
}
int
mio_eof(struct mio_hdl *hdl)
{
return hdl->eof;
}
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