view system/System.cpp @ 208:8a3d68910b37

* Framework for retrieving files from remote locations

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006 Chris Cannam and QMUL.
    
    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.  See the file
    COPYING included with this distribution for more information.
*/

#include "System.h"

#include <QStringList>
#include <QString>

#include <stdint.h>

#ifndef _WIN32
#include <signal.h>
#include <sys/statvfs.h>
#endif

#ifdef __APPLE__
#include <sys/param.h>
#include <sys/sysctl.h>
#endif

#include <iostream>

#ifdef _WIN32

extern "C" {

void usleep(unsigned long usec)
{
    ::Sleep(usec / 1000);
}

void gettimeofday(struct timeval *tv, void *tz)
{
    union { 
	long long ns100;  
	FILETIME ft; 
    } now; 
    
    ::GetSystemTimeAsFileTime(&now.ft); 
    tv->tv_usec = (long)((now.ns100 / 10LL) % 1000000LL); 
    tv->tv_sec = (long)((now.ns100 - 116444736000000000LL) / 10000000LL); 
}

}

#endif

ProcessStatus
GetProcessStatus(int pid)
{
#ifdef _WIN32
    HANDLE handle = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
    if (!handle) {
        return ProcessNotRunning;
    } else {
        CloseHandle(handle);
        return ProcessRunning;
    }
#else
    if (kill(getpid(), 0) == 0) {
        if (kill(pid, 0) == 0) {
            return ProcessRunning;
        } else {
            return ProcessNotRunning;
        }
    } else {
        return UnknownProcessStatus;
    }
#endif
}

void
GetRealMemoryMBAvailable(int &available, int &total)
{
    available = -1;
    total = -1;

#ifdef _WIN32

    MEMORYSTATUSEX status;
    status.dwLength = sizeof(status);
    if (!GlobalMemoryStatusEx(&status)) {
        std::cerr << "WARNING: GetDiskFreeSpaceEx failed: error code "
                  << GetLastError() << std::endl;
        return;
    }
    DWORDLONG size = status.ullAvailPhys / 1048576;
    if (size > INT_MAX) size = INT_MAX;
    available = int(size);

    size = status.ullTotalPhys / 1048576;
    if (size > INT_MAX) size = INT_MAX;
    total = int(size);

    return;

#else
#ifdef __APPLE__

    unsigned int val;
    int mib[2];
    size_t size_sys;
    
    mib[0] = CTL_HW;

    mib[1] = HW_PHYSMEM;
    size_sys = sizeof(val);
    sysctl(mib, 2, &val, &size_sys, NULL, 0);
    if (val) total = val / 1048576;

    mib[1] = HW_USERMEM;
    size_sys = sizeof(val);
    sysctl(mib, 2, &val, &size_sys, NULL, 0);
    if (val) available = val / 1048576;

    return;

#else

    FILE *meminfo = fopen("/proc/meminfo", "r");
    if (!meminfo) return;

    char buf[256];
    while (!feof(meminfo)) {
        fgets(buf, 256, meminfo);
        bool isMemFree = (strncmp(buf, "MemFree:", 8) == 0);
        bool isMemTotal = (!isMemFree && (strncmp(buf, "MemTotal:", 9) == 0));
        if (isMemFree || isMemTotal) {
            QString line = QString(buf).trimmed();
            QStringList elements = line.split(' ', QString::SkipEmptyParts);
            QString unit = "kB";
            if (elements.size() > 2) unit = elements[2];
            int size = elements[1].toInt();
//            std::cerr << "have size \"" << size << "\", unit \""
//                      << unit.toStdString() << "\"" << std::endl;
            if (unit.toLower() == "gb") size = size * 1024;
            else if (unit.toLower() == "mb") size = size;
            else if (unit.toLower() == "kb") size = size / 1024;
            else size = size / 1048576;

            if (isMemFree) available = size;
            else total = size;
        }
        if (available != -1 && total != -1) {
            fclose(meminfo);
            return;
        }
    }
    fclose(meminfo);

    return;

#endif
#endif
}

int
GetDiscSpaceMBAvailable(const char *path)
{
#ifdef _WIN32
    __int64 available, total, totalFree;
    if (GetDiskFreeSpaceEx(path, &available, &total, &totalFree)) {
        available /= 1048576;
        if (available > INT_MAX) available = INT_MAX;
        return int(available);
    } else {
        std::cerr << "WARNING: GetDiskFreeSpaceEx failed: error code "
                  << GetLastError() << std::endl;
        return -1;
    }
#else
    struct statvfs buf;
    if (!statvfs(path, &buf)) {
        // do the multiplies and divides in this order to reduce the
        // likelihood of arithmetic overflow
        std::cerr << "statvfs(" << path << ") says available: " << buf.f_bavail << ", block size: " << buf.f_bsize << std::endl;
        uint64_t available = ((buf.f_bavail / 1024) * buf.f_bsize) / 1024;
        if (available > INT_MAX) available = INT_MAX;
        return int(available);
    } else {
        perror("statvfs failed");
        return -1;
    }
#endif
}
    

double mod(double x, double y) { return x - (y * floor(x / y)); }
float modf(float x, float y) { return x - (y * floorf(x / y)); }

double princarg(double a) { return mod(a + M_PI, -2 * M_PI) + M_PI; }
float princargf(float a) { return modf(a + M_PI, -2 * M_PI) + M_PI; }