mirror of
https://github.com/ericonr/sndio.git
synced 2024-02-18 04:45:21 -06:00
235 lines
4.9 KiB
C
235 lines
4.9 KiB
C
/* $OpenBSD$ */
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/*
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* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <poll.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "debug.h"
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#include "mio_priv.h"
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#include "bsd-compat.h"
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struct mio_hdl *
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mio_open(const char *str, unsigned int mode, int nbio)
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{
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static char portany[] = MIO_PORTANY;
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struct mio_hdl *hdl;
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const char *p;
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#ifdef DEBUG
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sndio_debug_init();
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#endif
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if ((mode & (MIO_OUT | MIO_IN)) == 0)
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return NULL;
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if (str == NULL) /* backward compat */
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str = portany;
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if (strcmp(str, portany) == 0 && !issetugid()) {
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str = getenv("MIDIDEVICE");
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if (str == NULL)
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str = portany;
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}
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if (strcmp(str, portany) == 0) {
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hdl = mio_aucat_open("/0", mode, nbio, 1);
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if (hdl != NULL)
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return hdl;
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#if defined(USE_RMIDI)
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return mio_rmidi_open("/0", mode, nbio);
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#elif defined(USE_ALSA)
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return mio_alsa_open("/0", mode, nbio);
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#else
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return NULL;
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#endif
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}
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if ((p = sndio_parsetype(str, "snd")) != NULL ||
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(p = sndio_parsetype(str, "aucat")) != NULL)
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return mio_aucat_open(p, mode, nbio, 0);
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if ((p = sndio_parsetype(str, "midithru")) != NULL)
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return mio_aucat_open(p, mode, nbio, 1);
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if ((p = sndio_parsetype(str, "midi")) != NULL)
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return mio_aucat_open(p, mode, nbio, 2);
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#if defined(USE_RMIDI) || defined(USE_ALSA)
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if ((p = sndio_parsetype(str, "rmidi")) != NULL) {
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#if defined(USE_SUN)
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return mio_rmidi_open(p, mode, nbio);
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#elif defined(USE_ALSA)
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return mio_alsa_open(p, mode, nbio);
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#endif
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}
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#endif
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DPRINTF("mio_open: %s: unknown device type\n", str);
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return NULL;
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}
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void
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mio_create(struct mio_hdl *hdl, struct mio_ops *ops,
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unsigned int mode, int nbio)
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{
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hdl->ops = ops;
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hdl->mode = mode;
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hdl->nbio = nbio;
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hdl->eof = 0;
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}
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void
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mio_close(struct mio_hdl *hdl)
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{
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hdl->ops->close(hdl);
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}
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static int
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mio_psleep(struct mio_hdl *hdl, int event)
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{
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struct pollfd pfd[MIO_MAXNFDS];
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int revents;
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int nfds;
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nfds = mio_nfds(hdl);
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if (nfds > MIO_MAXNFDS) {
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DPRINTF("mio_psleep: %d: too many descriptors\n", nfds);
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hdl->eof = 1;
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return 0;
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}
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for (;;) {
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nfds = mio_pollfd(hdl, pfd, event);
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while (poll(pfd, nfds, -1) < 0) {
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if (errno == EINTR)
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continue;
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DPERROR("mio_psleep: poll");
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hdl->eof = 1;
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return 0;
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}
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revents = mio_revents(hdl, pfd);
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if (revents & POLLHUP) {
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DPRINTF("mio_psleep: hang-up\n");
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return 0;
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}
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if (revents & event)
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break;
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}
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return 1;
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}
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size_t
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mio_read(struct mio_hdl *hdl, void *buf, size_t len)
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{
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unsigned int n;
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char *data = buf;
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size_t todo = len;
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if (hdl->eof) {
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DPRINTF("mio_read: eof\n");
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return 0;
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}
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if (!(hdl->mode & MIO_IN)) {
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DPRINTF("mio_read: not input device\n");
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hdl->eof = 1;
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return 0;
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}
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if (len == 0) {
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DPRINTF("mio_read: zero length read ignored\n");
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return 0;
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}
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while (todo > 0) {
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n = hdl->ops->read(hdl, data, todo);
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if (n == 0 && hdl->eof)
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break;
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data += n;
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todo -= n;
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if (n > 0 || hdl->nbio)
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break;
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if (!mio_psleep(hdl, POLLIN))
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break;
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}
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return len - todo;
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}
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size_t
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mio_write(struct mio_hdl *hdl, const void *buf, size_t len)
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{
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unsigned int n;
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const unsigned char *data = buf;
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size_t todo = len;
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if (hdl->eof) {
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DPRINTF("mio_write: eof\n");
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return 0;
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}
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if (!(hdl->mode & MIO_OUT)) {
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DPRINTF("mio_write: not output device\n");
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hdl->eof = 1;
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return 0;
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}
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if (len == 0) {
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DPRINTF("mio_write: zero length write ignored\n");
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return 0;
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}
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if (todo == 0) {
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DPRINTF("mio_write: zero length write ignored\n");
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return 0;
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}
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while (todo > 0) {
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n = hdl->ops->write(hdl, data, todo);
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if (n == 0) {
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if (hdl->nbio || hdl->eof)
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break;
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if (!mio_psleep(hdl, POLLOUT))
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break;
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continue;
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}
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data += n;
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todo -= n;
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}
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return len - todo;
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}
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int
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mio_nfds(struct mio_hdl *hdl)
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{
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return hdl->ops->nfds(hdl);
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}
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int
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mio_pollfd(struct mio_hdl *hdl, struct pollfd *pfd, int events)
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{
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if (hdl->eof)
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return 0;
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return hdl->ops->pollfd(hdl, pfd, events);
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}
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int
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mio_revents(struct mio_hdl *hdl, struct pollfd *pfd)
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{
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if (hdl->eof)
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return POLLHUP;
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return hdl->ops->revents(hdl, pfd);
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}
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int
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mio_eof(struct mio_hdl *hdl)
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{
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return hdl->eof;
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}
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