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// Folve - A fuse filesystem that convolves audio files on-the-fly.
// Copyright (C) 2012 Henner Zeller <>
// 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 3 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
// 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, see <>.
#include "util.h"
#include <assert.h>
#include <linux/sched.h> // for SCHED_IDLE, <sched.h> doesn't do it everywhere
#include <stdio.h>
#include <sys/resource.h>
#include <sys/syscall.h> // need to call gettid syscall.
#include <sys/time.h>
#include <syslog.h>
#include <unistd.h>
#include <cstdarg>
#include <string.h>
double folve::CurrentTime() {
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec + tv.tv_usec / 1e6;
static void vAppendf(std::string *str, const char *format, va_list ap) {
const size_t orig_len = str->length();
const size_t space = 1024; // there should be better ways to do this...
str->resize(orig_len + space);
int written = vsnprintf((char*)str->data() + orig_len, space, format, ap);
str->resize(orig_len + written);
void folve::Appendf(std::string *str, const char *format, ...) {
va_list ap;
va_start(ap, format);
vAppendf(str, format, ap);
std::string folve::StringPrintf(const char *format, ...) {
va_list ap;
va_start(ap, format);
std::string result;
vAppendf(&result, format, ap);
return result;
static bool global_debug_log = false;
void folve::EnableDebugLog(bool b) {
if (b != global_debug_log) {
syslog(LOG_INFO, "Switch debug mode %s.", b ? "on" : "off");
global_debug_log = b;
bool folve::IsDebugLogEnabled() {
return global_debug_log;
void folve::DLogf(const char *format, ...) {
if (!global_debug_log) return;
va_list ap;
va_start(ap, format);
vsyslog(LOG_DEBUG, format, ap);
bool folve::HasSuffix(const std::string &str, const std::string &suffix) {
if (str.length() < suffix.length()) return false;
return - suffix.length(),
suffix.length(), suffix) == 0;
void *folve::Thread::PthreadCallRun(void *tobject) {
// Some hardcoded nicification of the thread. We use it for the pre-buffering
// which is nice-to-have and shouldn't interfere too much with other stuff.
setpriority(PRIO_PROCESS, syscall(SYS_gettid), 2);
return NULL;
folve::Thread::Thread() : started_(false) {}
folve::Thread::~Thread() {
int result = pthread_join(thread_, NULL);
if (result != 0) {
fprintf(stderr, "err code: %d %s\n", result, strerror(result));
void folve::Thread::Start() {
pthread_create(&thread_, NULL, &PthreadCallRun, this);
// Background thread:
struct sched_param p;
p.sched_priority = 0;
pthread_setschedparam(thread_, SCHED_IDLE, &p);
started_ = true;
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