/* fname is a relative path under "cpuX/cpufreq" dir */
static unsigned int sysfs_cpufreq_read_file(unsigned int cpu, const char *fname,
char *buf, size_t buflen)
{
char path[SYSFS_PATH_MAX];
snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpufreq/%s",
cpu, fname);
return sysfs_read_file(path, buf, buflen);
}
int _sysfs_prop_get_str(struct iscsi_context *ctx, const char *dir_path,
const char *prop_name, char *buff, size_t buff_size,
const char *default_value)
{
char file_path[PATH_MAX];
int rc = LIBISCSI_OK;
int errno_save = 0;
assert(dir_path != NULL);
assert(prop_name != NULL);
assert(buff != NULL);
snprintf(file_path, PATH_MAX, "%s/%s", dir_path, prop_name);
errno_save = sysfs_read_file(file_path, (uint8_t *) buff, buff_size);
if (errno_save != 0) {
if (errno_save == ENOENT) {
if (default_value == NULL) {
rc = LIBISCSI_ERR_SYSFS_LOOKUP;
_error(ctx, "Failed to read '%s': "
"file '%s' does not exists", prop_name,
file_path);
} else {
_info(ctx, "Failed to read '%s': "
"file '%s' does not exists, "
"using default value %s", prop_name,
file_path, default_value);
memcpy(buff, (void *) default_value,
strlen(default_value) + 1);
}
} else if (errno_save == EACCES) {
rc = LIBISCSI_ERR_ACCESS;
_error(ctx, "Failed to read '%s': "
"permission deny when reading '%s'", prop_name,
file_path);
} else {
rc = LIBISCSI_ERR_BUG;
_error(ctx, "Failed to read '%s': "
"error when reading '%s': %d", prop_name,
file_path, errno_save);
}
} else {
if ((buff[0] == '\0') && (default_value != NULL)) {
memcpy(buff, (void *) default_value,
strlen(default_value) + 1);
_debug(ctx, "Open '%s', got NULL, using default value",
file_path, default_value);
} else
_debug(ctx, "Open '%s', got '%s'", file_path, buff);
}
return rc;
}
/* returns -1 on failure, 0 on success */
int sysfs_topology_read_file(unsigned int cpu, const char *fname)
{
unsigned long value;
char linebuf[MAX_LINE_LEN];
char *endp;
char path[SYSFS_PATH_MAX];
snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/topology/%s",
cpu, fname);
if (sysfs_read_file(path, linebuf, MAX_LINE_LEN) == 0)
return -1;
value = strtoul(linebuf, &endp, 0);
if (endp == linebuf || errno == ERANGE)
return -1;
return value;
}
int sysfs_get_sched(const char *smt_mc)
{
unsigned long value;
char linebuf[MAX_LINE_LEN];
char *endp;
char path[SYSFS_PATH_MAX];
if (strcmp("mc", smt_mc) && strcmp("smt", smt_mc))
return -EINVAL;
snprintf(path, sizeof(path),
PATH_TO_CPU "sched_%s_power_savings", smt_mc);
if (sysfs_read_file(path, linebuf, MAX_LINE_LEN) == 0)
return -1;
value = strtoul(linebuf, &endp, 0);
if (endp == linebuf || errno == ERANGE)
return -1;
return value;
}
static int iscsi_sysfs_prop_get_ll(struct iscsi_context *ctx,
const char *dir_path, const char *prop_name,
long long int *val,
long long int default_value, bool ignore_error)
{
char file_path[PATH_MAX];
int rc = LIBISCSI_OK;
int errno_save = 0;
uint8_t buff[_INT32_STR_MAX_LEN];
long long int tmp_val = 0;
assert(dir_path != NULL);
assert(prop_name != NULL);
assert(val != NULL);
*val = 0;
snprintf(file_path, PATH_MAX, "%s/%s", dir_path, prop_name);
errno_save = sysfs_read_file(file_path, buff, _INT32_STR_MAX_LEN);
if (errno_save != 0) {
if (errno_save == ENOENT) {
if (! ignore_error) {
rc = LIBISCSI_ERR_SYSFS_LOOKUP;
_error(ctx, "Failed to read '%s': "
"file '%s' does not exists",
prop_name, file_path);
return rc;
} else {
_info(ctx,
"Failed to read '%s': "
"File '%s' does not exists, using ",
"default value %lld",
file_path, default_value);
*val = default_value;
return rc;
}
} else if (errno_save == EACCES) {
rc = LIBISCSI_ERR_ACCESS;
_error(ctx, "Permission deny when reading '%s'",
file_path);
return rc;
} else {
rc = LIBISCSI_ERR_BUG;
_error(ctx, "Error when reading '%s': %d", file_path,
errno_save);
return rc;
}
}
errno = 0;
tmp_val = strtoll((const char *) buff, NULL, 10 /* base */);
errno_save = errno;
if ((errno_save != 0) && (! ignore_error)) {
rc = LIBISCSI_ERR_BUG;
_error(ctx, "Sysfs: %s: Error when converting '%s' "
"to number", file_path, (char *) buff, errno_save);
return rc;
}
*val = tmp_val;
_debug(ctx, "Open '%s', got %lld", file_path, tmp_val);
return rc;
}