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ucm: implement sysset sequence command

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Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2021-03-05 19:55:06 +01:00
parent 2b418648cf
commit 1c6fb20232
5 changed files with 107 additions and 9 deletions
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72
src/ucm/main.c
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@ -31,6 +31,7 @@
*/
#include "ucm_local.h"
#include <stdbool.h>
#include <ctype.h>
#include <stdarg.h>
#include <pthread.h>
@ -323,6 +324,72 @@ static int execute_cset(snd_ctl_t *ctl, const char *cset, unsigned int type)
return err;
}
static int execute_sysset(const char *sysset)
{
char path[PATH_MAX];
const char *e;
char *s, *value;
ssize_t wlen;
size_t len;
int fd, myerrno;
bool ignore_error = false;
if (sysset == NULL || *sysset == '\0')
return 0;
ignore_error = sysset[0] == '-';
if (sysset[0] == ':')
return -EINVAL;
s = strdup(sysset[0] != '/' ? sysset : sysset + 1);
if (s == NULL)
return -ENOMEM;
value = strchr(s, ':');
if (!value) {
free(s);
return -EINVAL;
}
*value = '\0';
value++;
len = strlen(value);
if (len < 1) {
free(s);
return -EINVAL;
}
e = uc_mgr_sysfs_root();
if (e == NULL) {
free(s);
return -EINVAL;
}
snprintf(path, sizeof(path), "%s/%s", e, s);
fd = open(path, O_WRONLY|O_CLOEXEC);
if (fd < 0) {
free(s);
if (ignore_error)
return 0;
uc_error("unable to open '%s' for write", path);
return -EINVAL;
}
wlen = write(fd, value, len);
myerrno = errno;
close(fd);
free(s);
if (ignore_error)
return 0;
if (wlen != (ssize_t)len) {
uc_error("unable to write '%s' to '%s': %s", value, path, strerror(myerrno));
return -EINVAL;
}
return 0;
}
/**
* \brief Execute the sequence
* \param uc_mgr Use case manager
@ -420,6 +487,11 @@ static int execute_sequence(snd_use_case_mgr_t *uc_mgr,
goto __fail;
}
break;
case SEQUENCE_ELEMENT_TYPE_SYSSET:
err = execute_sysset(s->data.sysset);
if (err < 0)
goto __fail;
break;
case SEQUENCE_ELEMENT_TYPE_SLEEP:
usleep(s->data.sleep);
break;