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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libsndio/sio.c	Lines:	0	271	0.0 %
Date:	2017-11-07	Branches:	0	240	0.0 %


/*	$OpenBSD: sio.c,v 1.21 2016/01/09 08:27:24 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 <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "debug.h"
#include "sio_priv.h"

#define SIO_PAR_MAGIC	0x83b905a4

void
sio_initpar(struct sio_par *par)
{
	memset(par, 0xff, sizeof(struct sio_par));
	par->__magic = SIO_PAR_MAGIC;
}

struct sio_hdl *
sio_open(const char *str, unsigned int mode, int nbio)
{
	static char devany[] = SIO_DEVANY;
	struct sio_hdl *hdl;

#ifdef DEBUG
	_sndio_debug_init();
#endif
	if ((mode & (SIO_PLAY | SIO_REC)) == 0)
		return NULL;
	if (str == NULL) /* backward compat */
		str = devany;
	if (strcmp(str, devany) == 0 && !issetugid()) {
		str = getenv("AUDIODEVICE");
		if (str == NULL)
			str = devany;
	}
	if (strcmp(str, devany) == 0) {
		hdl = _sio_aucat_open("snd/0", mode, nbio);
		if (hdl != NULL)
			return hdl;
		return _sio_sun_open("rsnd/0", mode, nbio);
	}
	if (_sndio_parsetype(str, "snd"))
		return _sio_aucat_open(str, mode, nbio);
	if (_sndio_parsetype(str, "rsnd"))
		return _sio_sun_open(str, mode, nbio);
	DPRINTF("sio_open: %s: unknown device type\n", str);
	return NULL;
}

void
_sio_create(struct sio_hdl *hdl, struct sio_ops *ops,
    unsigned int mode, int nbio)
{
	hdl->ops = ops;
	hdl->mode = mode;
	hdl->nbio = nbio;
	hdl->started = 0;
	hdl->eof = 0;
	hdl->move_cb = NULL;
	hdl->vol_cb = NULL;
}

void
sio_close(struct sio_hdl *hdl)
{
	hdl->ops->close(hdl);
}

int
sio_start(struct sio_hdl *hdl)
{
#ifdef DEBUG
	struct timespec ts;
#endif

	if (hdl->eof) {
		DPRINTF("sio_start: eof\n");
		return 0;
	}
	if (hdl->started) {
		DPRINTF("sio_start: already started\n");
		hdl->eof = 1;
		return 0;
	}
	hdl->cpos = 0;
	hdl->rused = hdl->wused = 0;
	if (!sio_getpar(hdl, &hdl->par))
		return 0;
#ifdef DEBUG
	hdl->pollcnt = 0;
	clock_gettime(CLOCK_MONOTONIC, &ts);
	hdl->start_nsec = 1000000000LL * ts.tv_sec + ts.tv_nsec;
#endif
	hdl->rdrop = hdl->wsil = 0;
	if (!hdl->ops->start(hdl))
		return 0;
	hdl->started = 1;
	return 1;
}

int
sio_stop(struct sio_hdl *hdl)
{
	if (hdl->eof) {
		DPRINTF("sio_stop: eof\n");
		return 0;
	}
	if (!hdl->started) {
		DPRINTF("sio_stop: not started\n");
		hdl->eof = 1;
		return 0;
	}
	if (!hdl->ops->stop(hdl))
		return 0;
#ifdef DEBUG
	DPRINTFN(2, "libsndio: polls: %llu, samples = %llu\n",
	    hdl->pollcnt, hdl->cpos);
#endif
	hdl->started = 0;
	return 1;
}

int
sio_setpar(struct sio_hdl *hdl, struct sio_par *par)
{
	if (hdl->eof) {
		DPRINTF("sio_setpar: eof\n");
		return 0;
	}
	if (par->__magic != SIO_PAR_MAGIC) {
		DPRINTF("sio_setpar: uninitialized sio_par structure\n");
		hdl->eof = 1;
		return 0;
	}
	if (hdl->started) {
		DPRINTF("sio_setpar: already started\n");
		hdl->eof = 1;
		return 0;
	}
	if (par->bufsz != ~0U) {
		DPRINTF("sio_setpar: setting bufsz is deprecated\n");
		par->appbufsz = par->bufsz;
		par->bufsz = ~0U;
	}
	if (par->rate != ~0U && par->appbufsz == ~0U)
		par->appbufsz = par->rate * 200 / 1000;
	return hdl->ops->setpar(hdl, par);
}

int
sio_getpar(struct sio_hdl *hdl, struct sio_par *par)
{
	if (hdl->eof) {
		DPRINTF("sio_getpar: eof\n");
		return 0;
	}
	if (hdl->started) {
		DPRINTF("sio_getpar: already started\n");
		hdl->eof = 1;
		return 0;
	}
	if (!hdl->ops->getpar(hdl, par)) {
		par->__magic = 0;
		return 0;
	}
	par->__magic = 0;
	return 1;
}

int
sio_getcap(struct sio_hdl *hdl, struct sio_cap *cap)
{
	if (hdl->eof) {
		DPRINTF("sio_getcap: eof\n");
		return 0;
	}
	if (hdl->started) {
		DPRINTF("sio_getcap: already started\n");
		hdl->eof = 1;
		return 0;
	}
	return hdl->ops->getcap(hdl, cap);
}

static int
sio_psleep(struct sio_hdl *hdl, int event)
{
	struct pollfd pfd[SIO_MAXNFDS];
	int revents;
	int nfds;

	nfds = sio_nfds(hdl);
	if (nfds > SIO_MAXNFDS) {
		DPRINTF("sio_psleep: %d: too many descriptors\n", nfds);
		hdl->eof = 1;
		return 0;
	}
	for (;;) {
		nfds = sio_pollfd(hdl, pfd, event);
		while (poll(pfd, nfds, -1) < 0) {
			if (errno == EINTR)
				continue;
			DPERROR("sio_psleep: poll");
			hdl->eof = 1;
			return 0;
		}
		revents = sio_revents(hdl, pfd);
		if (revents & POLLHUP) {
			DPRINTF("sio_psleep: hang-up\n");
			return 0;
		}
		if (revents & event)
			break;
	}
	return 1;
}

static int
sio_rdrop(struct sio_hdl *hdl)
{
#define DROP_NMAX 0x1000
	static char dummy[DROP_NMAX];
	ssize_t n, todo;

	while (hdl->rdrop > 0) {
		todo = hdl->rdrop;
		if (todo > DROP_NMAX)
			todo = DROP_NMAX;
		n = hdl->ops->read(hdl, dummy, todo);
		if (n == 0)
			return 0;
		hdl->rdrop -= n;
		DPRINTF("sio_rdrop: dropped %zu bytes\n", n);
	}
	return 1;
}

static int
sio_wsil(struct sio_hdl *hdl)
{
#define ZERO_NMAX 0x1000
	static char zero[ZERO_NMAX];
	ssize_t n, todo;

	while (hdl->wsil > 0) {
		todo = hdl->wsil;
		if (todo > ZERO_NMAX)
			todo = ZERO_NMAX;
		n = hdl->ops->write(hdl, zero, todo);
		if (n == 0)
			return 0;
		hdl->wsil -= n;
		DPRINTF("sio_wsil: inserted %zu bytes\n", n);
	}
	return 1;
}

size_t
sio_read(struct sio_hdl *hdl, void *buf, size_t len)
{
	unsigned int n;
	char *data = buf;
	size_t todo = len, maxread;

	if (hdl->eof) {
		DPRINTF("sio_read: eof\n");
		return 0;
	}
	if (!hdl->started || !(hdl->mode & SIO_REC)) {
		DPRINTF("sio_read: recording not started\n");
		hdl->eof = 1;
		return 0;
	}
	if (todo == 0) {
		DPRINTF("sio_read: zero length read ignored\n");
		return 0;
	}
	while (todo > 0) {
		if (!sio_rdrop(hdl))
			return 0;
		maxread = hdl->rused;
		if (maxread > todo)
			maxread = todo;
		n = maxread > 0 ? hdl->ops->read(hdl, data, maxread) : 0;
		if (n == 0) {
			if (hdl->nbio || hdl->eof || todo < len)
				break;
			if (!sio_psleep(hdl, POLLIN))
				break;
			continue;
		}
		data += n;
		todo -= n;
		hdl->rused -= n;
	}
	return len - todo;
}

size_t
sio_write(struct sio_hdl *hdl, const void *buf, size_t len)
{
	unsigned int n;
	const unsigned char *data = buf;
	size_t todo = len, maxwrite;

	if (hdl->eof) {
		DPRINTF("sio_write: eof\n");
		return 0;
	}
	if (!hdl->started || !(hdl->mode & SIO_PLAY)) {
		DPRINTF("sio_write: playback not started\n");
		hdl->eof = 1;
		return 0;
	}
	if (todo == 0) {
		DPRINTF("sio_write: zero length write ignored\n");
		return 0;
	}
	while (todo > 0) {
		if (!sio_wsil(hdl))
			return 0;
		maxwrite = hdl->par.bufsz * hdl->par.pchan * hdl->par.bps -
		    hdl->wused;
		if (maxwrite > todo)
			maxwrite = todo;
		n = maxwrite > 0 ? hdl->ops->write(hdl, data, maxwrite) : 0;
		if (n == 0) {
			if (hdl->nbio || hdl->eof)
				break;
			if (!sio_psleep(hdl, POLLOUT))
				break;
			continue;
		}
		data += n;
		todo -= n;
		hdl->wused += n;
	}
	return len - todo;
}

int
sio_nfds(struct sio_hdl *hdl)
{
	return hdl->ops->nfds(hdl);
}

int
sio_pollfd(struct sio_hdl *hdl, struct pollfd *pfd, int events)
{
	if (hdl->eof)
		return 0;
	if (!hdl->started)
		events = 0;
	return hdl->ops->pollfd(hdl, pfd, events);
}

int
sio_revents(struct sio_hdl *hdl, struct pollfd *pfd)
{
	int revents;
#ifdef DEBUG
	struct timespec ts0, ts1;

	if (_sndio_debug >= 4)
		clock_gettime(CLOCK_MONOTONIC, &ts0);
#endif
	if (hdl->eof)
		return POLLHUP;
#ifdef DEBUG
	hdl->pollcnt++;
#endif
	revents = hdl->ops->revents(hdl, pfd);
	if (!hdl->started)
		return revents & POLLHUP;
#ifdef DEBUG
	if (_sndio_debug >= 4) {
		clock_gettime(CLOCK_MONOTONIC, &ts1);
		DPRINTF("%09lld: sio_revents: revents = 0x%x, took %lldns\n",
		    1000000000LL * ts0.tv_sec +
		    ts0.tv_nsec - hdl->start_nsec,
		    revents,
		    1000000000LL * (ts1.tv_sec - ts0.tv_sec) +
		    ts1.tv_nsec - ts0.tv_nsec);
	}
#endif
	if ((hdl->mode & SIO_PLAY) && !sio_wsil(hdl))
		revents &= ~POLLOUT;
	if ((hdl->mode & SIO_REC) && !sio_rdrop(hdl))
		revents &= ~POLLIN;
	return revents;
}

int
sio_eof(struct sio_hdl *hdl)
{
	return hdl->eof;
}

void
sio_onmove(struct sio_hdl *hdl, void (*cb)(void *, int), void *addr)
{
	if (hdl->started) {
		DPRINTF("sio_onmove: already started\n");
		hdl->eof = 1;
		return;
	}
	hdl->move_cb = cb;
	hdl->move_addr = addr;
}

#ifdef DEBUG
void
_sio_printpos(struct sio_hdl *hdl)
{
	struct timespec ts;
	long long rpos, rdiff;
	long long cpos, cdiff;
	long long wpos, wdiff;
	unsigned rbpf, wbpf, rround, wround;

	clock_gettime(CLOCK_MONOTONIC, &ts);
	rbpf = (hdl->mode & SIO_REC) ? hdl->par.bps * hdl->par.rchan : 1;
	wbpf = (hdl->mode & SIO_PLAY) ? hdl->par.bps * hdl->par.pchan : 1;
	rround = hdl->par.round * rbpf;
	wround = hdl->par.round * wbpf;

	rpos = (hdl->mode & SIO_REC) ?
	    hdl->cpos * rbpf - hdl->rused : 0;
	wpos = (hdl->mode & SIO_PLAY) ?
	    hdl->cpos * wbpf + hdl->wused : 0;

	cdiff = hdl->cpos % hdl->par.round;
	cpos  = hdl->cpos / hdl->par.round;
	if (cdiff > hdl->par.round / 2) {
		cpos++;
		cdiff = cdiff - hdl->par.round;
	}
	rdiff = rpos % rround;
	rpos  = rpos / rround;
	if (rdiff > rround / 2) {
		rpos++;
		rdiff = rdiff - rround;
	}
	wdiff = wpos % wround;
	wpos  = wpos / wround;
	if (wdiff > wround / 2) {
		wpos++;
		wdiff = wdiff - wround;
	}
	DPRINTF("%011lld: "
	    "clk %+5lld%+5lld, wr %+5lld%+5lld rd: %+5lld%+5lld\n",
	    1000000000LL * ts.tv_sec + ts.tv_nsec - hdl->start_nsec,
	    cpos, cdiff, wpos, wdiff, rpos, rdiff);
}
#endif

void
_sio_onmove_cb(struct sio_hdl *hdl, int delta)
{
	hdl->cpos += delta;
	if (hdl->mode & SIO_REC)
		hdl->rused += delta * (hdl->par.bps * hdl->par.rchan);
	if (hdl->mode & SIO_PLAY)
		hdl->wused -= delta * (hdl->par.bps * hdl->par.pchan);
#ifdef DEBUG
	if (_sndio_debug >= 3)
		_sio_printpos(hdl);
	if ((hdl->mode & SIO_PLAY) && hdl->wused < 0) {
		DPRINTFN(1, "sndio: h/w failure: negative buffer usage\n");
		hdl->eof = 1;
		return;
	}
#endif
	if (hdl->move_cb)
		hdl->move_cb(hdl->move_addr, delta);
}

int
sio_setvol(struct sio_hdl *hdl, unsigned int ctl)
{
	if (hdl->eof)
		return 0;
	if (!hdl->ops->setvol)
		return 1;
	if (!hdl->ops->setvol(hdl, ctl))
		return 0;
	hdl->ops->getvol(hdl);
	return 1;
}

int
sio_onvol(struct sio_hdl *hdl, void (*cb)(void *, unsigned int), void *addr)
{
	if (hdl->started) {
		DPRINTF("sio_onvol: already started\n");
		hdl->eof = 1;
		return 0;
	}
	if (!hdl->ops->setvol)
		return 0;
	hdl->vol_cb = cb;
	hdl->vol_addr = addr;
	hdl->ops->getvol(hdl);
	return 1;
}

void
_sio_onvol_cb(struct sio_hdl *hdl, unsigned int ctl)
{
	if (hdl->vol_cb)
		hdl->vol_cb(hdl->vol_addr, ctl);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: sio.c,v 1.21 2016/01/09 08:27:24 ratchov Exp $ */
2			/*
3			* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
4			*
5			* Permission to use, copy, modify, and distribute this software for any
6			* purpose with or without fee is hereby granted, provided that the above
7			* copyright notice and this permission notice appear in all copies.
8			*
9			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14			* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15			* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16			*/
17
18			#include <sys/types.h>
19			#include <sys/stat.h>
20
21			#include <errno.h>
22			#include <fcntl.h>
23			#include <poll.h>
24			#include <stdio.h>
25			#include <stdlib.h>
26			#include <string.h>
27			#include <time.h>
28			#include <unistd.h>
29
30			#include "debug.h"
31			#include "sio_priv.h"
32
33			#define SIO_PAR_MAGIC 0x83b905a4
34
35			void
36			sio_initpar(struct sio_par *par)
37			{
38			memset(par, 0xff, sizeof(struct sio_par));
39			par->__magic = SIO_PAR_MAGIC;
40			}
41
42			struct sio_hdl *
43			sio_open(const char *str, unsigned int mode, int nbio)
44			{
45			static char devany[] = SIO_DEVANY;
46			struct sio_hdl *hdl;
47
48			#ifdef DEBUG
49			_sndio_debug_init();
50			#endif
51			if ((mode & (SIO_PLAY \| SIO_REC)) == 0)
52			return NULL;
53			if (str == NULL) /* backward compat */
54			str = devany;
55			if (strcmp(str, devany) == 0 && !issetugid()) {
56			str = getenv("AUDIODEVICE");
57			if (str == NULL)
58			str = devany;
59			}
60			if (strcmp(str, devany) == 0) {
61			hdl = _sio_aucat_open("snd/0", mode, nbio);
62			if (hdl != NULL)
63			return hdl;
64			return _sio_sun_open("rsnd/0", mode, nbio);
65			}
66			if (_sndio_parsetype(str, "snd"))
67			return _sio_aucat_open(str, mode, nbio);
68			if (_sndio_parsetype(str, "rsnd"))
69			return _sio_sun_open(str, mode, nbio);
70			DPRINTF("sio_open: %s: unknown device type\n", str);
71			return NULL;
72			}
73
74			void
75			_sio_create(struct sio_hdl hdl, struct sio_ops ops,
76			unsigned int mode, int nbio)
77			{
78			hdl->ops = ops;
79			hdl->mode = mode;
80			hdl->nbio = nbio;
81			hdl->started = 0;
82			hdl->eof = 0;
83			hdl->move_cb = NULL;
84			hdl->vol_cb = NULL;
85			}
86
87			void
88			sio_close(struct sio_hdl *hdl)
89			{
90			hdl->ops->close(hdl);
91			}
92
93			int
94			sio_start(struct sio_hdl *hdl)
95			{
96			#ifdef DEBUG
97			struct timespec ts;
98			#endif
99
100			if (hdl->eof) {
101			DPRINTF("sio_start: eof\n");
102			return 0;
103			}
104			if (hdl->started) {
105			DPRINTF("sio_start: already started\n");
106			hdl->eof = 1;
107			return 0;
108			}
109			hdl->cpos = 0;
110			hdl->rused = hdl->wused = 0;
111			if (!sio_getpar(hdl, &hdl->par))
112			return 0;
113			#ifdef DEBUG
114			hdl->pollcnt = 0;
115			clock_gettime(CLOCK_MONOTONIC, &ts);
116			hdl->start_nsec = 1000000000LL * ts.tv_sec + ts.tv_nsec;
117			#endif
118			hdl->rdrop = hdl->wsil = 0;
119			if (!hdl->ops->start(hdl))
120			return 0;
121			hdl->started = 1;
122			return 1;
123			}
124
125			int
126			sio_stop(struct sio_hdl *hdl)
127			{
128			if (hdl->eof) {
129			DPRINTF("sio_stop: eof\n");
130			return 0;
131			}
132			if (!hdl->started) {
133			DPRINTF("sio_stop: not started\n");
134			hdl->eof = 1;
135			return 0;
136			}
137			if (!hdl->ops->stop(hdl))
138			return 0;
139			#ifdef DEBUG
140			DPRINTFN(2, "libsndio: polls: %llu, samples = %llu\n",
141			hdl->pollcnt, hdl->cpos);
142			#endif
143			hdl->started = 0;
144			return 1;
145			}
146
147			int
148			sio_setpar(struct sio_hdl hdl, struct sio_par par)
149			{
150			if (hdl->eof) {
151			DPRINTF("sio_setpar: eof\n");
152			return 0;
153			}
154			if (par->__magic != SIO_PAR_MAGIC) {
155			DPRINTF("sio_setpar: uninitialized sio_par structure\n");
156			hdl->eof = 1;
157			return 0;
158			}
159			if (hdl->started) {
160			DPRINTF("sio_setpar: already started\n");
161			hdl->eof = 1;
162			return 0;
163			}
164			if (par->bufsz != ~0U) {
165			DPRINTF("sio_setpar: setting bufsz is deprecated\n");
166			par->appbufsz = par->bufsz;
167			par->bufsz = ~0U;
168			}
169			if (par->rate != ~0U && par->appbufsz == ~0U)
170			par->appbufsz = par->rate * 200 / 1000;
171			return hdl->ops->setpar(hdl, par);
172			}
173
174			int
175			sio_getpar(struct sio_hdl hdl, struct sio_par par)
176			{
177			if (hdl->eof) {
178			DPRINTF("sio_getpar: eof\n");
179			return 0;
180			}
181			if (hdl->started) {
182			DPRINTF("sio_getpar: already started\n");
183			hdl->eof = 1;
184			return 0;
185			}
186			if (!hdl->ops->getpar(hdl, par)) {
187			par->__magic = 0;
188			return 0;
189			}
190			par->__magic = 0;
191			return 1;
192			}
193
194			int
195			sio_getcap(struct sio_hdl hdl, struct sio_cap cap)
196			{
197			if (hdl->eof) {
198			DPRINTF("sio_getcap: eof\n");
199			return 0;
200			}
201			if (hdl->started) {
202			DPRINTF("sio_getcap: already started\n");
203			hdl->eof = 1;
204			return 0;
205			}
206			return hdl->ops->getcap(hdl, cap);
207			}
208
209			static int
210			sio_psleep(struct sio_hdl *hdl, int event)
211			{
212			struct pollfd pfd[SIO_MAXNFDS];
213			int revents;
214			int nfds;
215
216			nfds = sio_nfds(hdl);
217			if (nfds > SIO_MAXNFDS) {
218			DPRINTF("sio_psleep: %d: too many descriptors\n", nfds);
219			hdl->eof = 1;
220			return 0;
221			}
222			for (;;) {
223			nfds = sio_pollfd(hdl, pfd, event);
224			while (poll(pfd, nfds, -1) < 0) {
225			if (errno == EINTR)
226			continue;
227			DPERROR("sio_psleep: poll");
228			hdl->eof = 1;
229			return 0;
230			}
231			revents = sio_revents(hdl, pfd);
232			if (revents & POLLHUP) {
233			DPRINTF("sio_psleep: hang-up\n");
234			return 0;
235			}
236			if (revents & event)
237			break;
238			}
239			return 1;
240			}
241
242			static int
243			sio_rdrop(struct sio_hdl *hdl)
244			{
245			#define DROP_NMAX 0x1000
246			static char dummy[DROP_NMAX];
247			ssize_t n, todo;
248
249			while (hdl->rdrop > 0) {
250			todo = hdl->rdrop;
251			if (todo > DROP_NMAX)
252			todo = DROP_NMAX;
253			n = hdl->ops->read(hdl, dummy, todo);
254			if (n == 0)
255			return 0;
256			hdl->rdrop -= n;
257			DPRINTF("sio_rdrop: dropped %zu bytes\n", n);
258			}
259			return 1;
260			}
261
262			static int
263			sio_wsil(struct sio_hdl *hdl)
264			{
265			#define ZERO_NMAX 0x1000
266			static char zero[ZERO_NMAX];
267			ssize_t n, todo;
268
269			while (hdl->wsil > 0) {
270			todo = hdl->wsil;
271			if (todo > ZERO_NMAX)
272			todo = ZERO_NMAX;
273			n = hdl->ops->write(hdl, zero, todo);
274			if (n == 0)
275			return 0;
276			hdl->wsil -= n;
277			DPRINTF("sio_wsil: inserted %zu bytes\n", n);
278			}
279			return 1;
280			}
281
282			size_t
283			sio_read(struct sio_hdl hdl, void buf, size_t len)
284			{
285			unsigned int n;
286			char *data = buf;
287			size_t todo = len, maxread;
288
289			if (hdl->eof) {
290			DPRINTF("sio_read: eof\n");
291			return 0;
292			}
293			if (!hdl->started \|\| !(hdl->mode & SIO_REC)) {
294			DPRINTF("sio_read: recording not started\n");
295			hdl->eof = 1;
296			return 0;
297			}
298			if (todo == 0) {
299			DPRINTF("sio_read: zero length read ignored\n");
300			return 0;
301			}
302			while (todo > 0) {
303			if (!sio_rdrop(hdl))
304			return 0;
305			maxread = hdl->rused;
306			if (maxread > todo)
307			maxread = todo;
308			n = maxread > 0 ? hdl->ops->read(hdl, data, maxread) : 0;
309			if (n == 0) {
310			if (hdl->nbio \|\| hdl->eof \|\| todo < len)
311			break;
312			if (!sio_psleep(hdl, POLLIN))
313			break;
314			continue;
315			}
316			data += n;
317			todo -= n;
318			hdl->rused -= n;
319			}
320			return len - todo;
321			}
322
323			size_t
324			sio_write(struct sio_hdl hdl, const void buf, size_t len)
325			{
326			unsigned int n;
327			const unsigned char *data = buf;
328			size_t todo = len, maxwrite;
329
330			if (hdl->eof) {
331			DPRINTF("sio_write: eof\n");
332			return 0;
333			}
334			if (!hdl->started \|\| !(hdl->mode & SIO_PLAY)) {
335			DPRINTF("sio_write: playback not started\n");
336			hdl->eof = 1;
337			return 0;
338			}
339			if (todo == 0) {
340			DPRINTF("sio_write: zero length write ignored\n");
341			return 0;
342			}
343			while (todo > 0) {
344			if (!sio_wsil(hdl))
345			return 0;
346			maxwrite = hdl->par.bufsz * hdl->par.pchan * hdl->par.bps -
347			hdl->wused;
348			if (maxwrite > todo)
349			maxwrite = todo;
350			n = maxwrite > 0 ? hdl->ops->write(hdl, data, maxwrite) : 0;
351			if (n == 0) {
352			if (hdl->nbio \|\| hdl->eof)
353			break;
354			if (!sio_psleep(hdl, POLLOUT))
355			break;
356			continue;
357			}
358			data += n;
359			todo -= n;
360			hdl->wused += n;
361			}
362			return len - todo;
363			}
364
365			int
366			sio_nfds(struct sio_hdl *hdl)
367			{
368			return hdl->ops->nfds(hdl);
369			}
370
371			int
372			sio_pollfd(struct sio_hdl hdl, struct pollfd pfd, int events)
373			{
374			if (hdl->eof)
375			return 0;
376			if (!hdl->started)
377			events = 0;
378			return hdl->ops->pollfd(hdl, pfd, events);
379			}
380
381			int
382			sio_revents(struct sio_hdl hdl, struct pollfd pfd)
383			{
384			int revents;
385			#ifdef DEBUG
386			struct timespec ts0, ts1;
387
388			if (_sndio_debug >= 4)
389			clock_gettime(CLOCK_MONOTONIC, &ts0);
390			#endif
391			if (hdl->eof)
392			return POLLHUP;
393			#ifdef DEBUG
394			hdl->pollcnt++;
395			#endif
396			revents = hdl->ops->revents(hdl, pfd);
397			if (!hdl->started)
398			return revents & POLLHUP;
399			#ifdef DEBUG
400			if (_sndio_debug >= 4) {
401			clock_gettime(CLOCK_MONOTONIC, &ts1);
402			DPRINTF("%09lld: sio_revents: revents = 0x%x, took %lldns\n",
403			1000000000LL * ts0.tv_sec +
404			ts0.tv_nsec - hdl->start_nsec,
405			revents,
406			1000000000LL * (ts1.tv_sec - ts0.tv_sec) +
407			ts1.tv_nsec - ts0.tv_nsec);
408			}
409			#endif
410			if ((hdl->mode & SIO_PLAY) && !sio_wsil(hdl))
411			revents &= ~POLLOUT;
412			if ((hdl->mode & SIO_REC) && !sio_rdrop(hdl))
413			revents &= ~POLLIN;
414			return revents;
415			}
416
417			int
418			sio_eof(struct sio_hdl *hdl)
419			{
420			return hdl->eof;
421			}
422
423			void
424			sio_onmove(struct sio_hdl hdl, void (cb)(void , int), void addr)
425			{
426			if (hdl->started) {
427			DPRINTF("sio_onmove: already started\n");
428			hdl->eof = 1;
429			return;
430			}
431			hdl->move_cb = cb;
432			hdl->move_addr = addr;
433			}
434
435			#ifdef DEBUG
436			void
437			_sio_printpos(struct sio_hdl *hdl)
438			{
439			struct timespec ts;
440			long long rpos, rdiff;
441			long long cpos, cdiff;
442			long long wpos, wdiff;
443			unsigned rbpf, wbpf, rround, wround;
444
445			clock_gettime(CLOCK_MONOTONIC, &ts);
446			rbpf = (hdl->mode & SIO_REC) ? hdl->par.bps * hdl->par.rchan : 1;
447			wbpf = (hdl->mode & SIO_PLAY) ? hdl->par.bps * hdl->par.pchan : 1;
448			rround = hdl->par.round * rbpf;
449			wround = hdl->par.round * wbpf;
450
451			rpos = (hdl->mode & SIO_REC) ?
452			hdl->cpos * rbpf - hdl->rused : 0;
453			wpos = (hdl->mode & SIO_PLAY) ?
454			hdl->cpos * wbpf + hdl->wused : 0;
455
456			cdiff = hdl->cpos % hdl->par.round;
457			cpos = hdl->cpos / hdl->par.round;
458			if (cdiff > hdl->par.round / 2) {
459			cpos++;
460			cdiff = cdiff - hdl->par.round;
461			}
462			rdiff = rpos % rround;
463			rpos = rpos / rround;
464			if (rdiff > rround / 2) {
465			rpos++;
466			rdiff = rdiff - rround;
467			}
468			wdiff = wpos % wround;
469			wpos = wpos / wround;
470			if (wdiff > wround / 2) {
471			wpos++;
472			wdiff = wdiff - wround;
473			}
474			DPRINTF("%011lld: "
475			"clk %+5lld%+5lld, wr %+5lld%+5lld rd: %+5lld%+5lld\n",
476			1000000000LL * ts.tv_sec + ts.tv_nsec - hdl->start_nsec,
477			cpos, cdiff, wpos, wdiff, rpos, rdiff);
478			}
479			#endif
480
481			void
482			_sio_onmove_cb(struct sio_hdl *hdl, int delta)
483			{
484			hdl->cpos += delta;
485			if (hdl->mode & SIO_REC)
486			hdl->rused += delta * (hdl->par.bps * hdl->par.rchan);
487			if (hdl->mode & SIO_PLAY)
488			hdl->wused -= delta * (hdl->par.bps * hdl->par.pchan);
489			#ifdef DEBUG
490			if (_sndio_debug >= 3)
491			_sio_printpos(hdl);
492			if ((hdl->mode & SIO_PLAY) && hdl->wused < 0) {
493			DPRINTFN(1, "sndio: h/w failure: negative buffer usage\n");
494			hdl->eof = 1;
495			return;
496			}
497			#endif
498			if (hdl->move_cb)
499			hdl->move_cb(hdl->move_addr, delta);
500			}
501
502			int
503			sio_setvol(struct sio_hdl *hdl, unsigned int ctl)
504			{
505			if (hdl->eof)
506			return 0;
507			if (!hdl->ops->setvol)
508			return 1;
509			if (!hdl->ops->setvol(hdl, ctl))
510			return 0;
511			hdl->ops->getvol(hdl);
512			return 1;
513			}
514
515			int
516			sio_onvol(struct sio_hdl hdl, void (cb)(void , unsigned int), void addr)
517			{
518			if (hdl->started) {
519			DPRINTF("sio_onvol: already started\n");
520			hdl->eof = 1;
521			return 0;
522			}
523			if (!hdl->ops->setvol)
524			return 0;
525			hdl->vol_cb = cb;
526			hdl->vol_addr = addr;
527			hdl->ops->getvol(hdl);
528			return 1;
529			}
530
531			void
532			_sio_onvol_cb(struct sio_hdl *hdl, unsigned int ctl)
533			{
534			if (hdl->vol_cb)
535			hdl->vol_cb(hdl->vol_addr, ctl);
536			}