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alsa-utils/alsactl/alsactl.c
Jaroslav Kysela 17b4129e6c alsactl: add 'clean' command to remove the application controls 
It is handy to remove all card controls created by applications.

This change allows to remove those controls for all cards, selected
card or selected card with a control id filter list like:

   alsactl clean 0 "name='PCM'" "name='Mic Phantom'"

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
2021-03-04 21:15:56 +01:00

416 lines
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/*
* Advanced Linux Sound Architecture Control Program
* Copyright (c) by Abramo Bagnara <abramo@alsa-project.org>
* Jaroslav Kysela <perex@perex.cz>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "aconfig.h"
#include "version.h"
#include <getopt.h>
#include <stdarg.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <syslog.h>
#include <sched.h>
#include <alsa/asoundlib.h>
#include "alsactl.h"
#ifndef SYS_ASOUNDRC
#define SYS_ASOUNDRC "/var/lib/alsa/asound.state"
#endif
#ifndef SYS_PIDFILE
#define SYS_PIDFILE "/var/run/alsactl.pid"
#endif
#ifndef SYS_LOCKPATH
#define SYS_LOCKPATH "/var/lock"
#endif
int debugflag = 0;
int force_restore = 1;
int ignore_nocards = 0;
int do_lock = 0;
int use_syslog = 0;
char *command;
char *statefile = NULL;
char *lockfile = SYS_LOCKFILE;
#define TITLE 0x0100
#define HEADER 0x0200
#define FILEARG 0x0400
#define ENVARG 0x0800
#define INTARG 0x1000
#define EMPCMD 0x2000
#define CARDCMD 0x4000
#define KILLCMD 0x8000
struct arg {
int sarg;
char *larg;
char *comment;
};
static struct arg args[] = {
{ TITLE, NULL, "Usage: alsactl <options> command" },
{ HEADER, NULL, "global options:" },
{ 'h', "help", "this help" },
{ 'd', "debug", "debug mode" },
{ 'v', "version", "print version of this program" },
{ HEADER, NULL, "Available state options:" },
{ FILEARG | 'f', "file", "configuration file (default " SYS_ASOUNDRC ")" },
{ 'l', "lock", "use file locking to serialize concurrent access" },
{ '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" },
{ 'P', "pedantic", "do not restore mismatching controls (old default)" },
{ 'I', "no-init-fallback", "" },
{ 0, NULL, "don't initialize even if restore fails" },
{ FILEARG | 'r', "runstate", "save restore and init state to this file (only errors)" },
{ 0, NULL, " default settings is 'no file set'" },
{ 'R', "remove", "remove runstate file at first, otherwise append errors" },
{ INTARG | 'p', "period", "store period in seconds for the daemon command" },
{ FILEARG | 'e', "pid-file", "pathname for the process id (daemon mode)" },
{ HEADER, NULL, "Available init options:" },
{ ENVARG | 'E', "env", "set environment variable for init phase (NAME=VALUE)" },
{ FILEARG | 'i', "initfile", "main configuation file for init phase" },
{ 0, NULL, " (default " DATADIR "/init/00main)" },
{ 'b', "background", "run daemon in background" },
{ 's', "syslog", "use syslog for messages" },
{ INTARG | 'n', "nice", "set the process priority (see 'man nice')" },
{ 'c', "sched-idle", "set the process scheduling policy to idle (SCHED_IDLE)" },
#ifdef HAVE_ALSA_USE_CASE_H
{ 'D', "ucm-defaults", "execute also the UCM 'defaults' section" },
{ 'U', "no-ucm", "don't init with UCM" },
#endif
{ HEADER, NULL, "Available commands:" },
{ CARDCMD, "store", "save current driver setup for one or each soundcards" },
{ EMPCMD, NULL, " to configuration file" },
{ CARDCMD, "restore", "load current driver setup for one or each soundcards" },
{ EMPCMD, NULL, " from configuration file" },
{ CARDCMD, "nrestore", "like restore, but notify the daemon to rescan soundcards" },
{ CARDCMD, "init", "initialize driver to a default state" },
{ CARDCMD, "daemon", "store state periodically for one or each soundcards" },
{ CARDCMD, "rdaemon", "like daemon but do the state restore at first" },
{ KILLCMD, "kill", "notify daemon to quit, rescan or save_and_quit" },
{ CARDCMD, "monitor", "monitor control events" },
{ 0, NULL, NULL }
};
static void help(void)
{
struct arg *n = args, *a;
char *larg, sa[4], buf[32];
int sarg;
sa[0] = '-';
sa[2] = ',';
sa[3] = '\0';
while (n->comment) {
a = n;
n++;
sarg = a->sarg;
if (sarg & (HEADER|TITLE)) {
printf("%s%s\n", (sarg & HEADER) != 0 ? "\n" : "",
a->comment);
continue;
}
buf[0] = '\0';
larg = a->larg;
if (sarg & (EMPCMD|CARDCMD|KILLCMD)) {
if (sarg & CARDCMD)
strcat(buf, "<card>");
else if (sarg & KILLCMD)
strcat(buf, "<cmd>");
printf(" %-8s %-6s %s\n", larg ? larg : "",
buf, a->comment);
continue;
}
sa[1] = a->sarg;
sprintf(buf, "%s%s%s", sa[1] ? sa : "",
larg ? "--" : "", larg ? larg : "");
if (sarg & ENVARG)
strcat(buf, " #=#");
else if (sarg & (FILEARG|INTARG))
strcat(buf, " #");
printf(" %-15s %s\n", buf, a->comment);
}
}
#define NO_NICE (-100000)
static void do_nice(int use_nice, int sched_idle)
{
struct sched_param sched_param;
if (use_nice != NO_NICE && nice(use_nice) < 0)
error("nice(%i): %s", use_nice, strerror(errno));
if (sched_idle) {
if (sched_getparam(0, &sched_param) >= 0) {
sched_param.sched_priority = 0;
if (sched_setscheduler(0, SCHED_IDLE, &sched_param) < 0)
error("sched_setparam failed: %s", strerror(errno));
} else {
error("sched_getparam failed: %s", strerror(errno));
}
}
}
int main(int argc, char *argv[])
{
static const char *const devfiles[] = {
"/dev/snd/controlC",
"/dev/snd/pcmC",
"/dev/snd/midiC",
"/dev/snd/hwC",
NULL
};
char *cfgfile = SYS_ASOUNDRC;
char *initfile = DATADIR "/init/00main";
char *pidfile = SYS_PIDFILE;
char *cardname, ncardname[16];
char *cmd;
char *const *extra_args;
const char *const *tmp;
int removestate = 0;
int init_fallback = 1; /* new default behavior */
int period = 5*60;
int background = 0;
int daemoncmd = 0;
int use_nice = NO_NICE;
int sched_idle = 0;
int initflags = 0;
struct arg *a;
struct option *o;
int i, j, k, res;
struct option *long_option;
char *short_option;
long_option = calloc(ARRAY_SIZE(args), sizeof(struct option));
if (long_option == NULL)
exit(EXIT_FAILURE);
short_option = malloc(128);
if (short_option == NULL) {
free(long_option);
exit(EXIT_FAILURE);
}
for (i = j = k = 0; i < ARRAY_SIZE(args); i++) {
a = &args[i];
if ((a->sarg & 0xff) == 0)
continue;
o = &long_option[j];
o->name = a->larg;
o->has_arg = (a->sarg & (ENVARG|FILEARG|INTARG)) != 0;
o->flag = NULL;
o->val = a->sarg & 0xff;
j++;
short_option[k++] = o->val;
if (o->has_arg)
short_option[k++] = ':';
}
short_option[k] = '\0';
command = argv[0];
while (1) {
int c;
if ((c = getopt_long(argc, argv, short_option, long_option,
NULL)) < 0)
break;
switch (c) {
case 'h':
help();
res = EXIT_SUCCESS;
goto out;
case 'f':
cfgfile = optarg;
break;
case 'l':
do_lock = 1;
break;
case 'L':
do_lock = -1;
break;
case 'O':
lockfile = optarg;
break;
case 'F':
force_restore = 1;
break;
case 'g':
ignore_nocards = 1;
break;
case 'E':
if (putenv(optarg)) {
fprintf(stderr, "environment string '%s' is wrong\n", optarg);
res = EXIT_FAILURE;
goto out;
}
break;
case 'i':
initfile = optarg;
break;
case 'I':
init_fallback = 0;
break;
case 'D':
initflags |= FLAG_UCM_DEFAULTS;
break;
case 'U':
initflags |= FLAG_UCM_DISABLED;
break;
case 'r':
statefile = optarg;
break;
case 'R':
removestate = 1;
break;
case 'P':
force_restore = 0;
break;
case 'p':
period = atoi(optarg);
if (period < 10)
period = 5*60;
else if (period > 24*60*60)
period = 24*60*60;
break;
case 'e':
pidfile = optarg;
break;
case 'b':
background = 1;
break;
case 's':
use_syslog = 1;
break;
case 'n':
use_nice = atoi(optarg);
if (use_nice < -20)
use_nice = -20;
else if (use_nice > 19)
use_nice = 19;
break;
case 'c':
sched_idle = 1;
break;
case 'd':
debugflag = 1;
break;
case 'v':
printf("alsactl version " SND_UTIL_VERSION_STR "\n");
res = EXIT_SUCCESS;
goto out;
case '?': // error msg already printed
help();
res = EXIT_FAILURE;
goto out;
default: // should never happen
fprintf(stderr,
"Invalid option '%c' (%d) not handled??\n", c, c);
}
}
free(short_option);
short_option = NULL;
free(long_option);
long_option = NULL;
if (argc - optind <= 0) {
fprintf(stderr, "alsactl: Specify command...\n");
res = 0;
goto out;
}
cardname = argc - optind > 1 ? argv[optind + 1] : NULL;
for (tmp = devfiles; cardname != NULL && *tmp != NULL; tmp++) {
int len = strlen(*tmp);
if (!strncmp(cardname, *tmp, len)) {
long l = strtol(cardname + len, NULL, 0);
sprintf(ncardname, "%li", l);
cardname = ncardname;
break;
}
}
extra_args = argc - optind > 2 ? argv + optind + 2 : NULL;
/* the global system file should be always locked */
if (strcmp(cfgfile, SYS_ASOUNDRC) == 0 && do_lock >= 0)
do_lock = 1;
/* when running in background, use syslog for reports */
if (background) {
use_syslog = 1;
daemon(0, 0);
}
cmd = argv[optind];
daemoncmd = strcmp(cmd, "daemon") == 0 || strcmp(cmd, "rdaemon") == 0;
if (use_syslog) {
openlog("alsactl", LOG_CONS|LOG_PID, LOG_DAEMON);
if (daemoncmd)
syslog(LOG_INFO, "alsactl " SND_UTIL_VERSION_STR " daemon started");
}
snd_lib_error_set_handler(error_handler);
if (!strcmp(cmd, "init")) {
res = init(initfile, initflags, cardname);
snd_config_update_free_global();
} else if (!strcmp(cmd, "store")) {
res = save_state(cfgfile, cardname);
} else if (!strcmp(cmd, "restore") ||
!strcmp(cmd, "rdaemon") ||
!strcmp(cmd, "nrestore")) {
if (removestate)
remove(statefile);
res = load_state(cfgfile, initfile, initflags, cardname, init_fallback);
if (!strcmp(cmd, "rdaemon")) {
do_nice(use_nice, sched_idle);
res = state_daemon(cfgfile, cardname, period, pidfile);
}
if (!strcmp(cmd, "nrestore"))
res = state_daemon_kill(pidfile, "rescan");
} else if (!strcmp(cmd, "daemon")) {
do_nice(use_nice, sched_idle);
res = state_daemon(cfgfile, cardname, period, pidfile);
} else if (!strcmp(cmd, "kill")) {
res = state_daemon_kill(pidfile, cardname);
} else if (!strcmp(cmd, "monitor")) {
res = monitor(cardname);
} else if (!strcmp(cmd, "clean")) {
res = clean(cardname, extra_args);
} else {
fprintf(stderr, "alsactl: Unknown command '%s'...\n", cmd);
res = -ENODEV;
}
snd_config_update_free_global();
if (use_syslog) {
if (daemoncmd)
syslog(LOG_INFO, "alsactl daemon stopped");
closelog();
}
return res < 0 ? -res : 0;
out:
free(short_option);
free(long_option);
return res;
}
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