mirror of
https://github.com/ericonr/sndio.git
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160 lines
3.5 KiB
C
160 lines
3.5 KiB
C
/* $OpenBSD: mio_rmidi.c,v 1.7 2010/07/21 23:00:16 ratchov Exp $ */
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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/types.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 <limits.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 "mio_priv.h"
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#define RMIDI_PATH "/dev/rmidi0"
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struct rmidi_hdl {
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struct mio_hdl mio;
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int fd;
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};
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static void rmidi_close(struct mio_hdl *);
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static size_t rmidi_read(struct mio_hdl *, void *, size_t);
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static size_t rmidi_write(struct mio_hdl *, const void *, size_t);
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static int rmidi_pollfd(struct mio_hdl *, struct pollfd *, int);
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static int rmidi_revents(struct mio_hdl *, struct pollfd *);
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static struct mio_ops rmidi_ops = {
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rmidi_close,
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rmidi_write,
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rmidi_read,
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rmidi_pollfd,
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rmidi_revents,
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};
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struct mio_hdl *
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mio_open_rmidi(const char *str, unsigned mode, int nbio)
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{
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int fd, flags;
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struct rmidi_hdl *hdl;
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char path[PATH_MAX];
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hdl = malloc(sizeof(struct rmidi_hdl));
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if (hdl == NULL)
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return NULL;
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mio_create(&hdl->mio, &rmidi_ops, mode, nbio);
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snprintf(path, sizeof(path), "/dev/rmidi%s", str);
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if (mode == (MIO_OUT | MIO_IN))
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flags = O_RDWR;
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else
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flags = (mode & MIO_OUT) ? O_WRONLY : O_RDONLY;
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if (nbio)
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flags |= O_NONBLOCK;
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while ((fd = open(path, flags)) < 0) {
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if (errno == EINTR)
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continue;
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DPERROR(path);
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goto bad_free;
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}
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if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) {
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DPERROR("FD_CLOEXEC");
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goto bad_close;
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}
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hdl->fd = fd;
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return (struct mio_hdl *)hdl;
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bad_close:
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while (close(hdl->fd) < 0 && errno == EINTR)
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; /* retry */
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bad_free:
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free(hdl);
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return NULL;
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}
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static void
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rmidi_close(struct mio_hdl *sh)
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{
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struct rmidi_hdl *hdl = (struct rmidi_hdl *)sh;
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int rc;
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do {
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rc = close(hdl->fd);
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} while (rc < 0 && errno == EINTR);
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free(hdl);
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}
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static size_t
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rmidi_read(struct mio_hdl *sh, void *buf, size_t len)
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{
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struct rmidi_hdl *hdl = (struct rmidi_hdl *)sh;
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ssize_t n;
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while ((n = read(hdl->fd, buf, len)) < 0) {
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if (errno == EINTR)
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continue;
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if (errno != EAGAIN) {
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DPERROR("rmidi_read: read");
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hdl->mio.eof = 1;
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}
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return 0;
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}
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if (n == 0) {
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DPRINTF("rmidi_read: eof\n");
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hdl->mio.eof = 1;
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return 0;
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}
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return n;
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}
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static size_t
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rmidi_write(struct mio_hdl *sh, const void *buf, size_t len)
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{
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struct rmidi_hdl *hdl = (struct rmidi_hdl *)sh;
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ssize_t n;
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while ((n = write(hdl->fd, buf, len)) < 0) {
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if (errno == EINTR)
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continue;
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if (errno != EAGAIN) {
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DPERROR("rmidi_write: write");
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hdl->mio.eof = 1;
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}
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return 0;
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}
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return n;
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}
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static int
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rmidi_pollfd(struct mio_hdl *sh, struct pollfd *pfd, int events)
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{
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struct rmidi_hdl *hdl = (struct rmidi_hdl *)sh;
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pfd->fd = hdl->fd;
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pfd->events = events;
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return 1;
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}
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static int
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rmidi_revents(struct mio_hdl *sh, struct pollfd *pfd)
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{
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return pfd->revents;
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}
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