/** Helper for writing to sysfs files
*/
static void lwl_write_file(const char *path, const char *data)
{
int file;
lwl_debug(path, " << ", data, NULL);
if( (file = TEMP_FAILURE_RETRY(open(path, O_WRONLY))) == -1 ) {
lwl_debug(path, ": open: ", strerror(errno), "\n", NULL);
} else {
int size = strlen(data);
errno = 0;
if( TEMP_FAILURE_RETRY(write(file, data, size)) != size ) {
lwl_debug(path, ": write: ", strerror(errno),
"\n", NULL);
}
TEMP_FAILURE_RETRY(close(file));
}
}
/** Helper for checking if wakelock interface is supported
*/
static int lwl_enabled(void)
{
static int checked = 0, enabled = 0;
if( !checked ) {
checked = 1, enabled = !access(lwl_lock_path, F_OK);
lwl_debug(enabled ? "enabled" : "disabled", "\n", NULL);
}
return enabled;
}
/** Write text to a sysfs file
*
* @param path file to write
* @param data text to write
* @param size lenght of text
*
* @return true if write was successful, false otherwise
*/
static bool
lwl_write_text(const char *path, const char *data, int size)
{
bool res = false;
int fd = -1;
if( !path || !data || size <= 0 )
goto cleanup;
lwl_debug(path, " << ", data, "\n", NULL);
if( (fd = open(path, O_WRONLY)) == -1 )
goto cleanup;
if( write(fd, data, size) == -1 )
goto cleanup;
res = true;
cleanup:
if( fd != -1 ) close(fd);
return res;
}
