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alsa-utils/alsactl/alsactl.c
Jaroslav Kysela 611249ae26 alsactl: add --nice and --sched-idle options 
The state management can run at low priority, add --nice and --sched-idle
options to set the scheduler.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
2013-04-10 09:42:40 +02:00

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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
int debugflag = 0;
int force_restore = 1;
int ignore_nocards = 0;
int do_lock = 0;
int use_syslog = 0;
char *command;
char *statefile = NULL;
#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" },
{ '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)" },
{ 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" },
{ 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_RR, &sched_param))
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;
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;
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 '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 '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;
}
}
/* the global system file should be always locked */
if (strcmp(cfgfile, SYS_ASOUNDRC) == 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");
}
if (!strcmp(cmd, "init")) {
res = init(initfile, 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, 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 {
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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