alsactl: add -L (no-lock) and change -D (lock-dir) to -O (state-lock-file)

Signed-off-by: Jaroslav Kysela <perex@perex.cz>

alsactl/Makefile.am

@@ -12,7 +12,7 @@ alsactl_SOURCES=alsactl.c state.c lock.c utils.c init_parse.c daemon.c \
 
 alsactl_CFLAGS=$(AM_CFLAGS) -D__USE_GNU \
                -DSYS_ASOUNDRC=\"$(ASOUND_STATE_DIR)/asound.state\" \
-               -DSYS_LOCKPATH=\"$(ASOUND_LOCK_DIR)\" \
+               -DSYS_LOCKFILE=\"$(ASOUND_LOCK_DIR)/asound.state.lock\" \
                -DSYS_PIDFILE=\"$(ALSACTL_PIDFILE_DIR)/alsactl.pid\"
 
 noinst_HEADERS=alsactl.h list.h init_sysdeps.c init_utils_string.c \

alsactl/alsactl.1

@@ -1,4 +1,4 @@
-.TH ALSACTL 1 "05 Apr 2013"
+.TH ALSACTL 1 "07 May 2014"
 .SH NAME
 alsactl \- advanced controls for ALSA soundcard driver
 
@@ -60,6 +60,20 @@ Print alsactl version number.
 \fI\-f, \-\-file\fP
 Select the configuration file to use. The default is /var/lib/alsa/asound.state.
 
+.TP
+\fI\-l, \-\-lock\fP
+Use the file locking to serialize the concurrent access to the state file (this
+option is default for the global state file).
+
+.TP
+\fI\-L, \-\-no-lock\fP
+Do not use the file locking to serialize the concurrent access to the state
+file (including the global state file).
+
+.TP
+\fI\-O, \-\-lock-state-file\fP
+Select the state lock file path.
+
 .TP
 \fI\-F, \-\-force\fP
 Used with restore command.  Try to restore the matching control elements

alsactl/alsactl.c

@@ -49,7 +49,7 @@ int do_lock = 0;
 int use_syslog = 0;
 char *command;
 char *statefile = NULL;
-char *lockpath = SYS_LOCKPATH;
+char *lockfile = SYS_LOCKFILE;
 
 #define TITLE	0x0100
 #define HEADER	0x0200
@@ -75,7 +75,8 @@ static struct arg args[] = {
 { HEADER, NULL, "Available state options:" },
 { FILEARG | 'f', "file", "configuration file (default " SYS_ASOUNDRC ")" },
 { 'l', "lock", "use file locking to serialize concurrent access" },
-{ FILEARG | 'D', "lock-dir", "directory to use for lock files (default " SYS_LOCKPATH ")" },
+{ 'L', "no-lock", "do not use file locking to serialize concurrent access" },
+{ FILEARG | 'O', "lock-state-file", "state lock file path (default " SYS_LOCKFILE ")" },
 { 'F', "force", "try to restore the matching controls as much as possible" },
 { 0, NULL, "  (default mode)" },
 { 'g', "ignore", "ignore 'No soundcards found' error" },
@@ -237,8 +238,12 @@ int main(int argc, char *argv[])
 		case 'l':
 			do_lock = 1;
 			break;
-		case 'D':
-			lockpath = optarg;
+		case 'L':
+			do_lock = -1;
+			break;
+		case 'O':
+			lockfile = optarg;
+			break;
 		case 'F':
 			force_restore = 1;
 			break;
@@ -331,7 +336,7 @@ int main(int argc, char *argv[])
 	}
 
 	/* the global system file should be always locked */
-	if (strcmp(cfgfile, SYS_ASOUNDRC) == 0)
+	if (strcmp(cfgfile, SYS_ASOUNDRC) == 0 && do_lock >= 0)
 		do_lock = 1;
 
 	/* when running in background, use syslog for reports */

alsactl/alsactl.h

@@ -5,7 +5,7 @@ extern int do_lock;
 extern int use_syslog;
 extern char *command;
 extern char *statefile;
-extern char *lockpath;
+extern char *lockfile;
 
 void info_(const char *fcn, long line, const char *fmt, ...);
 void error_(const char *fcn, long line, const char *fmt, ...);

alsactl/lock.c

@@ -36,24 +36,11 @@ static int state_lock_(const char *file, int lock, int timeout)
 	struct flock lck;
 	struct stat st;
 	char lcktxt[12];
-	char *filename;
-	char *nfile;
+	char *nfile = lockfile;
 
-	if (!do_lock)
+	if (do_lock <= 0)
 		return 0;
 
-	/* only use the actual filename, not the path */
-	filename = strrchr(file, '/');
-	if (!filename)
-		filename = file;
-
-	nfile = malloc(strlen(lockpath) + strlen(filename) + 7);
-	if (nfile == NULL) {
-		error("No enough memory...");
-		return -ENOMEM;
-	}
-
-	sprintf(nfile, "%s/%s.lock", lockpath, filename);
 	lck.l_type = lock ? F_WRLCK : F_UNLCK;
 	lck.l_whence = SEEK_SET;
 	lck.l_start = 0;
@@ -114,7 +101,6 @@ static int state_lock_(const char *file, int lock, int timeout)
 		goto out;
 	}
 out:
-	free(nfile);
 	return err;
 }