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- /* See LICENSE file for copyright and license details. */
- #include <errno.h>
- #include <fcntl.h>
- #if defined(__OpenBSD__)
- # include <soundcard.h>
- #else
- # include <sys/soundcard.h>
- #endif
- #include <sys/ioctl.h>
- #include <stdio.h>
- #include <string.h>
- #include <unistd.h>
-
- #include "../util.h"
-
- const char *
- vol_perc(const char *card)
- {
- unsigned int i;
- int v, afd, devmask;
- char *vnames[] = SOUND_DEVICE_NAMES;
-
- afd = open(card, O_RDONLY | O_NONBLOCK);
- if (afd == -1) {
- fprintf(stderr, "open '%s': %s\n", card, strerror(errno));
- return NULL;
- }
-
- if (ioctl(afd, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) {
- fprintf(stderr, "ioctl 'SOUND_MIXER_READ_DEVMASK': %s\n", strerror(errno));
- close(afd);
- return NULL;
- }
- for (i = 0; i < LEN(vnames); i++) {
- if (devmask & (1 << i) && !strcmp("vol", vnames[i])) {
- if (ioctl(afd, MIXER_READ(i), &v) == -1) {
- fprintf(stderr, "ioctl 'MIXER_READ(%d)': %s\n", i, strerror(errno));
- close(afd);
- return NULL;
- }
- }
- }
-
- close(afd);
-
- return bprintf("%d", v & 0xff);
- }
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