Use the sioctl_open(3) OpenBSD API to access vol
Starting with OpenBSD 6.7 regular users cannot access raw audio devices anymore, for improved security. Instead use the sioctl_open(3) API to access and manipulate audio controls exposed by sndiod(8). On the first call a permanent connection is established with the running sndiod daemon, and call-back functions are registered which are triggered when audio controls are changed (e.g., a USB headset is attached) or when the volume is modified. On subsequent calls we poll for changes; if there are no volume changes this costs virtually nothing. Joint work with Alexandre Ratchov
This commit is contained in:
Ingo Feinerer
Aaron Marcher
parent
aaf279f6dd
commit
9ac721c23f
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@ -8,69 +8,177 @@
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#include "../util.h"
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#if defined(__OpenBSD__)
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#include <sys/audioio.h>
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#include <sys/queue.h>
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#include <poll.h>
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#include <sndio.h>
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#include <stdlib.h>
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struct control {
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LIST_ENTRY(control) next;
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unsigned int addr;
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#define CTRL_NONE 0
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#define CTRL_LEVEL 1
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#define CTRL_MUTE 2
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unsigned int type;
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unsigned int maxval;
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unsigned int val;
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};
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static LIST_HEAD(, control) controls = LIST_HEAD_INITIALIZER(controls);
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static struct pollfd *pfds;
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static struct sioctl_hdl *hdl;
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static int initialized;
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/*
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* Call-back to obtain the description of all audio controls.
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*/
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static void
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ondesc(void *unused, struct sioctl_desc *desc, int val)
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{
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struct control *c, *ctmp;
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unsigned int type = CTRL_NONE;
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if (desc == NULL)
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return;
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/* Delete existing audio control with the same address. */
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LIST_FOREACH_SAFE(c, &controls, next, ctmp) {
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if (desc->addr == c->addr) {
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LIST_REMOVE(c, next);
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free(c);
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break;
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}
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}
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/* Only match output.level and output.mute audio controls. */
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if (desc->group[0] != 0 ||
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strcmp(desc->node0.name, "output") != 0)
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return;
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if (desc->type == SIOCTL_NUM &&
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strcmp(desc->func, "level") == 0)
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type = CTRL_LEVEL;
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else if (desc->type == SIOCTL_SW &&
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strcmp(desc->func, "mute") == 0)
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type = CTRL_MUTE;
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else
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return;
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c = malloc(sizeof(struct control));
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if (c == NULL) {
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warn("sndio: failed to allocate audio control\n");
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return;
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}
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c->addr = desc->addr;
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c->type = type;
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c->maxval = desc->maxval;
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c->val = val;
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LIST_INSERT_HEAD(&controls, c, next);
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}
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/*
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* Call-back invoked whenever an audio control changes.
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*/
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static void
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onval(void *unused, unsigned int addr, unsigned int val)
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{
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struct control *c;
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LIST_FOREACH(c, &controls, next) {
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if (c->addr == addr)
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break;
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}
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c->val = val;
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}
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static void
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cleanup(void)
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{
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struct control *c;
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if (hdl) {
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sioctl_close(hdl);
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hdl = NULL;
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}
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free(pfds);
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pfds = NULL;
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while (!LIST_EMPTY(&controls)) {
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c = LIST_FIRST(&controls);
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LIST_REMOVE(c, next);
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free(c);
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}
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}
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static int
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init(void)
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{
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hdl = sioctl_open(SIO_DEVANY, SIOCTL_READ, 0);
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if (hdl == NULL) {
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warn("sndio: cannot open device");
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goto failed;
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}
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if (!sioctl_ondesc(hdl, ondesc, NULL)) {
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warn("sndio: cannot set control description call-back");
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goto failed;
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}
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if (!sioctl_onval(hdl, onval, NULL)) {
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warn("sndio: cannot set control values call-back");
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goto failed;
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}
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pfds = calloc(sioctl_nfds(hdl), sizeof(struct pollfd));
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if (pfds == NULL) {
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warn("sndio: cannot allocate pollfd structures");
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goto failed;
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}
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return 1;
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failed:
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cleanup();
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return 0;
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}
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const char *
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vol_perc(const char *card)
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vol_perc(const char *unused)
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{
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static int cls = -1;
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mixer_devinfo_t mdi;
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mixer_ctrl_t mc;
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int afd = -1, m = -1, v = -1;
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struct control *c;
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int n, v, value;
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if ((afd = open(card, O_RDONLY)) < 0) {
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warn("open '%s':", card);
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return NULL;
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}
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if (!initialized)
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initialized = init();
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for (mdi.index = 0; cls == -1; mdi.index++) {
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if (ioctl(afd, AUDIO_MIXER_DEVINFO, &mdi) < 0) {
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warn("ioctl 'AUDIO_MIXER_DEVINFO':");
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close(afd);
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if (hdl == NULL)
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return NULL;
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n = sioctl_pollfd(hdl, pfds, POLLIN);
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if (n > 0) {
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n = poll(pfds, n, 0);
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if (n > 0) {
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if (sioctl_revents(hdl, pfds) & POLLHUP) {
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warn("sndio: disconnected");
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cleanup();
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return NULL;
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}
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if (mdi.type == AUDIO_MIXER_CLASS &&
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!strncmp(mdi.label.name,
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AudioCoutputs,
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MAX_AUDIO_DEV_LEN))
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cls = mdi.index;
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}
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for (mdi.index = 0; v == -1 || m == -1; mdi.index++) {
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if (ioctl(afd, AUDIO_MIXER_DEVINFO, &mdi) < 0) {
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warn("ioctl 'AUDIO_MIXER_DEVINFO':");
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close(afd);
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return NULL;
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}
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if (mdi.mixer_class == cls &&
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((mdi.type == AUDIO_MIXER_VALUE &&
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!strncmp(mdi.label.name,
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AudioNmaster,
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MAX_AUDIO_DEV_LEN)) ||
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(mdi.type == AUDIO_MIXER_ENUM &&
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!strncmp(mdi.label.name,
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AudioNmute,
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MAX_AUDIO_DEV_LEN)))) {
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mc.dev = mdi.index, mc.type = mdi.type;
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if (ioctl(afd, AUDIO_MIXER_READ, &mc) < 0) {
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warn("ioctl 'AUDIO_MIXER_READ':");
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close(afd);
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return NULL;
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}
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if (mc.type == AUDIO_MIXER_VALUE)
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v = mc.un.value.num_channels == 1 ?
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mc.un.value.level[AUDIO_MIXER_LEVEL_MONO] :
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(mc.un.value.level[AUDIO_MIXER_LEVEL_LEFT] >
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mc.un.value.level[AUDIO_MIXER_LEVEL_RIGHT] ?
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mc.un.value.level[AUDIO_MIXER_LEVEL_LEFT] :
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mc.un.value.level[AUDIO_MIXER_LEVEL_RIGHT]);
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else if (mc.type == AUDIO_MIXER_ENUM)
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m = mc.un.ord;
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}
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}
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close(afd);
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value = 100;
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LIST_FOREACH(c, &controls, next) {
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if (c->type == CTRL_MUTE && c->val == 1)
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value = 0;
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else if (c->type == CTRL_LEVEL) {
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v = (c->val * 100 + c->maxval / 2) / c->maxval;
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/* For multiple channels return the minimum. */
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if (v < value)
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value = v;
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}
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}
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return bprintf("%d", m ? 0 : v * 100 / 255);
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return bprintf("%d", value);
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}
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#else
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#include <sys/soundcard.h>
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@ -59,6 +59,7 @@ static const char unknown_str[] = "n/a";
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* uptime system uptime NULL
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* username username of current user NULL
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* vol_perc OSS/ALSA volume in percent mixer file (/dev/mixer)
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* NULL on OpenBSD
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* wifi_perc WiFi signal in percent interface name (wlan0)
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* wifi_essid WiFi ESSID interface name (wlan0)
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*/
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