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https://github.com/freebsd/freebsd-src.git
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Goran Mekić
6a56966686
- Simplify directory and file structure. - Clean up and improve code. Add more comments. - Add polling examples. MFC after: 1 week Reviewed by: christos Differential Revision: https://reviews.freebsd.org/D53353
80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2025 Goran Mekić
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/event.h>
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#include "oss.h"
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int
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main(int argc, char *argv[])
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{
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struct config config = {
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.device = "/dev/dsp",
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.mode = O_RDWR,
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.format = AFMT_S32_NE,
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.sample_rate = 48000,
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};
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struct kevent event = {};
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int rc, bytes, kq;
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oss_init(&config);
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bytes = config.buffer_info.bytes;
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if ((kq = kqueue()) < 0)
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err(1, "Failed to allocate kqueue");
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EV_SET(&event, config.fd, EVFILT_WRITE, EV_ADD | EV_CLEAR, 0, 0, 0);
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if (kevent(kq, &event, 1, NULL, 0, NULL) < 0)
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err(1, "Failed to register kevent");
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for (;;) {
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if (kevent(kq, NULL, 0, &event, 1, NULL) < 0) {
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warn("Event error");
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break;
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}
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if (event.flags & EV_ERROR) {
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warn("Event error: %s", strerror(event.data));
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break;
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}
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if ((rc = read(config.fd, config.buf, bytes)) < bytes) {
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warn("Requested %d bytes, but read %d!\n", bytes, rc);
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break;
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}
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if ((rc = write(config.fd, config.buf, bytes)) < bytes) {
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warn("Requested %d bytes, but wrote %d!\n", bytes, rc);
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break;
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}
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}
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EV_SET(&event, config.fd, EVFILT_WRITE, EV_DELETE, 0, 0, 0);
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if (kevent(kq, &event, 1, NULL, 0, NULL) < 0)
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err(1, "Failed to unregister kevent");
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close(kq);
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free(config.buf);
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close(config.fd);
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return (0);
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}
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