X-Git-Url: https://git.xinqibao.xyz/slstatus.git/blobdiff_plain/c288663ebdeb78ef50a6378651bb14380ed4b20a..870d68d44e33f9fb7a5402becbc0b5c363066bcc:/slstatus.c

diff --git a/slstatus.c b/slstatus.c
index f06c373..8241451 100644
--- a/slstatus.c
+++ b/slstatus.c
@@ -71,7 +71,7 @@ static void usage(const int eval);
 char *argv0;
 static unsigned short int delay = 0;
 static unsigned short int done;
-static unsigned short int dflag, oflag;
+static unsigned short int dflag, oflag, nflag;
 static Display *dpy;
 
 #include "config.h"
@@ -667,17 +667,23 @@ vol_perc(const char *card)
 	int v, afd, devmask;
 	char *vnames[] = SOUND_DEVICE_NAMES;
 
-	afd = open(card, O_RDONLY);
-	if (afd < 0) {
+	afd = open(card, O_RDONLY | O_NONBLOCK);
+	if (afd == -1) {
 		warn("Cannot open %s", card);
 		return smprintf(UNKNOWN_STR);
 	}
 
-	ioctl(afd, MIXER_READ(SOUND_MIXER_DEVMASK), &devmask);
+	if (ioctl(afd, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) {
+		warn("Cannot get volume for %s", card);
+		close(afd);
+		return smprintf("%s", UNKNOWN_STR);
+	}
 	for (i = 0; i < (sizeof(vnames) / sizeof((vnames[0]))); i++) {
-		if (devmask & (1 << i)) {
-			if (!strcmp("vol", vnames[i])) {
-				ioctl(afd, MIXER_READ(i), &v);
+		if (devmask & (1 << i) && !strcmp("vol", vnames[i])) {
+			if (ioctl(afd, MIXER_READ(i), &v) == -1) {
+				warn("vol_perc: ioctl");
+				close(afd);
+				return smprintf("%s", UNKNOWN_STR);
 			}
 		}
 	}
@@ -769,7 +775,7 @@ sighandler(const int signo)
 static void
 usage(const int eval)
 {
-	fprintf(stderr, "usage: %s [-d] [-o] [-v] [-h]\n", argv0);
+	fprintf(stderr, "usage: %s [-d] [-o] [-n] [-v] [-h]\n", argv0);
 	exit(eval);
 }
 
@@ -789,6 +795,9 @@ main(int argc, char *argv[])
 		case 'o':
 			oflag = 1;
 			break;
+		case 'n':
+			nflag = 1;
+			break;
 		case 'v':
 			printf("slstatus (C) 2016-2017 slstatus engineers\n");
 			return 0;
@@ -798,7 +807,7 @@ main(int argc, char *argv[])
 			usage(1);
 	} ARGEND
 
-	if (dflag && oflag) {
+	if ((dflag && oflag) || (dflag && nflag) || (oflag && nflag)) {
 		usage(1);
 	}
 	if (dflag && daemon(1, 1) < 0) {
@@ -836,11 +845,14 @@ main(int argc, char *argv[])
 			free(element);
 		}
 
-		if (!oflag) {
+		if (oflag) {
+			printf("%s\n", status_string);
+		} else if (nflag) {
+			printf("%s\n", status_string);
+			done = 1;
+		} else {
 			XStoreName(dpy, DefaultRootWindow(dpy), status_string);
 			XSync(dpy, False);
-		} else {
-			printf("%s\n", status_string);
 		}
 
 		if ((UPDATE_INTERVAL - delay) <= 0) {