diff options
Diffstat (limited to 'lib/libsndio/mio.c')
| -rw-r--r-- | lib/libsndio/mio.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/lib/libsndio/mio.c b/lib/libsndio/mio.c new file mode 100644 index 00000000000..b03582d1635 --- /dev/null +++ b/lib/libsndio/mio.c @@ -0,0 +1,184 @@ +/* $OpenBSD: mio.c,v 1.1 2009/07/25 08:44:26 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/param.h> +#include <sys/types.h> +#include <sys/time.h> +#include <sys/stat.h> +#include <errno.h> +#include <fcntl.h> +#include <poll.h> +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <unistd.h> + +#include "mio_priv.h" + +#ifdef DEBUG +/* + * debug level, -1 means uninitialized + */ +int mio_debug = -1; +#endif + +struct mio_hdl * +mio_open(char *str, unsigned mode, int nbio) +{ + static char prefix_midithru[] = "midithru"; + static char prefix_rmidi[] = "rmidi"; + struct mio_hdl *hdl; + struct stat sb; + char *sep, buf[4]; + int len; +#ifdef DEBUG + char *dbg; + + if (mio_debug < 0) { + dbg = issetugid() ? NULL : getenv("MIO_DEBUG"); + if (!dbg || sscanf(dbg, "%u", &mio_debug) != 1) + mio_debug = 0; + } +#endif + if ((mode & (MIO_OUT | MIO_IN)) == 0) + return NULL; + if (str == NULL && !issetugid()) + str = getenv("MIDIDEVICE"); + if (str == NULL) { + hdl = mio_open_thru("0", mode, nbio); + if (hdl != NULL) + return hdl; + return mio_open_rmidi("0", mode, nbio); + } + sep = strchr(str, ':'); + if (sep == NULL) { + /* + * try legacy "/dev/rmidioxxx" device name + */ + if (stat(str, &sb) < 0 || !S_ISCHR(sb.st_mode)) { + DPRINTF("mio_open: %s: missing ':' separator\n", str); + return NULL; + } + snprintf(buf, sizeof(buf), "%u", minor(sb.st_rdev)); + return mio_open_rmidi(buf, mode, nbio); + } + if (sep == str) { + /* + * legacy "/dev/rmidixxx" device name + */ + if (stat(str, &sb) < 0) { + DPERROR("mio_open: stat"); + return NULL; + } + if (!S_ISCHR(sb.st_mode)) { + DPRINTF("mio_open: %s: not a char dev\n", str); + return NULL; + } + snprintf(buf, sizeof(buf), "%u", minor(sb.st_rdev)); + return mio_open_rmidi(buf, mode, nbio); + } + + len = sep - str; + if (len == strlen(prefix_midithru) && + memcmp(str, prefix_midithru, len) == 0) + return mio_open_thru(sep + 1, mode, nbio); + if (len == strlen(prefix_rmidi) && + memcmp(str, prefix_rmidi, len) == 0) + return mio_open_rmidi(sep + 1, 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 mode, int nbio) +{ + hdl->ops = ops; + hdl->mode = mode; + hdl->nbio = nbio; + hdl->eof = 0; +} + +void +mio_close(struct mio_hdl *hdl) +{ + return hdl->ops->close(hdl); +} + +size_t +mio_read(struct mio_hdl *hdl, void *buf, size_t 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; + } + return hdl->ops->read(hdl, buf, len); +} + +size_t +mio_write(struct mio_hdl *hdl, void *buf, size_t 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; + } + return hdl->ops->write(hdl, buf, len); +} + +int +mio_nfds(struct mio_hdl *hdl) +{ + return 1; +} + +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; +} |