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/* $OpenBSD: mio_rmidi.c,v 1.4 2009/07/26 12:40:45 ratchov 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/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "mio_priv.h"
#define RMIDI_PATH "/dev/rmidi0"
struct rmidi_hdl {
struct mio_hdl mio;
int fd;
};
static void rmidi_close(struct mio_hdl *);
static size_t rmidi_read(struct mio_hdl *, void *, size_t);
static size_t rmidi_write(struct mio_hdl *, const void *, size_t);
static int rmidi_pollfd(struct mio_hdl *, struct pollfd *, int);
static int rmidi_revents(struct mio_hdl *, struct pollfd *);
static struct mio_ops rmidi_ops = {
rmidi_close,
rmidi_write,
rmidi_read,
rmidi_pollfd,
rmidi_revents,
};
struct mio_hdl *
mio_open_rmidi(const char *str, unsigned mode, int nbio)
{
int fd, flags;
struct rmidi_hdl *hdl;
char path[PATH_MAX];
hdl = malloc(sizeof(struct rmidi_hdl));
if (hdl == NULL)
return NULL;
mio_create(&hdl->mio, &rmidi_ops, mode, nbio);
snprintf(path, sizeof(path), "/dev/rmidi%s", str);
if (mode == (MIO_OUT | MIO_IN))
flags = O_RDWR;
else
flags = (mode & MIO_OUT) ? O_WRONLY : O_RDONLY;
while ((fd = open(path, flags | O_NONBLOCK)) < 0) {
if (errno == EINTR)
continue;
DPERROR(path);
goto bad_free;
}
if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) {
DPERROR("FD_CLOEXEC");
goto bad_close;
}
hdl->fd = fd;
return (struct mio_hdl *)hdl;
bad_close:
while (close(hdl->fd) < 0 && errno == EINTR)
; /* retry */
bad_free:
free(hdl);
return NULL;
}
static void
rmidi_close(struct mio_hdl *sh)
{
struct rmidi_hdl *hdl = (struct rmidi_hdl *)sh;
int rc;
do {
rc = close(hdl->fd);
} while (rc < 0 && errno == EINTR);
free(hdl);
}
static size_t
rmidi_read(struct mio_hdl *sh, void *buf, size_t len)
{
struct rmidi_hdl *hdl = (struct rmidi_hdl *)sh;
ssize_t n;
while ((n = read(hdl->fd, buf, len)) < 0) {
if (errno == EINTR)
continue;
if (errno != EAGAIN) {
DPERROR("rmidi_read: read");
hdl->mio.eof = 1;
}
return 0;
}
if (n == 0) {
DPRINTF("rmidi_read: eof\n");
hdl->mio.eof = 1;
return 0;
}
return n;
}
static size_t
rmidi_write(struct mio_hdl *sh, const void *buf, size_t len)
{
struct rmidi_hdl *hdl = (struct rmidi_hdl *)sh;
ssize_t n;
while ((n = write(hdl->fd, buf, len)) < 0) {
if (errno == EINTR)
continue;
if (errno != EAGAIN) {
DPERROR("rmidi_write: write");
hdl->mio.eof = 1;
return 0;
}
return 0;
}
return n;
}
static int
rmidi_pollfd(struct mio_hdl *sh, struct pollfd *pfd, int events)
{
struct rmidi_hdl *hdl = (struct rmidi_hdl *)sh;
pfd->fd = hdl->fd;
pfd->events = events;
return 1;
}
static int
rmidi_revents(struct mio_hdl *sh, struct pollfd *pfd)
{
return pfd->revents;
}
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