/*
 * Author:  David Robert Nadeau
 * Site:    http://NadeauSoftware.com/
 * License: Creative Commons Attribution 3.0 Unported License
 *          http://creativecommons.org/licenses/by/3.0/deed.en_US
 */

#if defined(_WIN32)
#include <winsock2.h>
#include <windows.h>
#define PSAPI_VERSION 1
#include <psapi.h>
#pragma comment(lib, "psapi.lib")

#elif defined(__unix__) || defined(__unix) || defined(unix) || (defined(__APPLE__) && defined(__MACH__))
#include <unistd.h>
#include <sys/resource.h>

#if defined(__APPLE__) && defined(__MACH__)
#include <mach/mach.h>

#elif (defined(_AIX) || defined(__TOS__AIX__)) || (defined(__sun__) || defined(__sun) || defined(sun) && (defined(__SVR4) || defined(__svr4__)))
#include <fcntl.h>
#include <procfs.h>

#elif defined(__linux__) || defined(__linux) || defined(linux) || defined(__gnu_linux__)
#include <stdio.h>

#endif

#else
#error "Cannot define getPeakRSS( ) or getCurrentRSS( ) for an unknown OS."
#endif





/**
 * Returns the peak (maximum so far) resident set size (physical
 * memory use) measured in bytes, or zero if the value cannot be
 * determined on this OS.
 */
static size_t getPeakRSS(void)
{
#if defined(_WIN32)
        /* Windows -------------------------------------------------- */
        PROCESS_MEMORY_COUNTERS info;
        GetProcessMemoryInfo( GetCurrentProcess( ), &info, sizeof(info) );
        return (size_t)info.PeakWorkingSetSize;

#elif (defined(_AIX) || defined(__TOS__AIX__)) || (defined(__sun__) || defined(__sun) || defined(sun) && (defined(__SVR4) || defined(__svr4__)))
        /* AIX and Solaris ------------------------------------------ */
        struct psinfo psinfo;
        int fd = -1;
        if ( (fd = open( "/proc/self/psinfo", O_RDONLY )) == -1 )
                return (size_t)0L;              /* Can't open? */
        if ( read( fd, &psinfo, sizeof(psinfo) ) != sizeof(psinfo) )
        {
                close( fd );
                return (size_t)0L;              /* Can't read? */
        }
        close( fd );
        return (size_t)(psinfo.pr_rssize * 1024L);

#elif defined(__unix__) || defined(__unix) || defined(unix) || (defined(__APPLE__) && defined(__MACH__))
        /* BSD, Linux, and OSX -------------------------------------- */
        struct rusage rusage;
        getrusage( RUSAGE_SELF, &rusage );
#if defined(__APPLE__) && defined(__MACH__)
        return (size_t)rusage.ru_maxrss;
#else
        return (size_t)(rusage.ru_maxrss * 1024L);
#endif

#else
        /* Unknown OS ----------------------------------------------- */
        return (size_t)0L;                      /* Unsupported. */
#endif
}





/**
 * Returns the current resident set size (physical memory use) measured
 * in bytes, or zero if the value cannot be determined on this OS.
 */
static size_t getCurrentRSS(void)
{
#if defined(_WIN32)
        /* Windows -------------------------------------------------- */
        PROCESS_MEMORY_COUNTERS info;
        GetProcessMemoryInfo( GetCurrentProcess( ), &info, sizeof(info) );
        return (size_t)info.WorkingSetSize;

#elif defined(__APPLE__) && defined(__MACH__)
        /* OSX ------------------------------------------------------ */
#if defined(MACH_TASK_BASIC_INFO)
        struct mach_task_basic_info info;
        mach_msg_type_number_t infoCount = MACH_TASK_BASIC_INFO_COUNT;
        if ( task_info( mach_task_self( ), MACH_TASK_BASIC_INFO,
                (task_info_t)&info, &infoCount ) != KERN_SUCCESS )
                return (size_t)0L;              /* Can't access? */
        return (size_t)info.resident_size;
#else
        struct task_basic_info info;
        mach_msg_type_number_t infoCount = TASK_BASIC_INFO_COUNT;
        if ( task_info( mach_task_self( ), TASK_BASIC_INFO,
                (task_info_t)&info, &infoCount ) != KERN_SUCCESS )
                return (size_t)0L;              /* Can't access? */
        return (size_t)info.resident_size;
#endif
#elif defined(__linux__) || defined(__linux) || defined(linux) || defined(__gnu_linux__)
        /* Linux ---------------------------------------------------- */
        long rss = 0L;
        FILE* fp = NULL;
        if ( (fp = fopen( "/proc/self/statm", "r" )) == NULL )
                return (size_t)0L;              /* Can't open? */
        if ( fscanf( fp, "%*s%ld", &rss ) != 1 )
        {
                fclose( fp );
                return (size_t)0L;              /* Can't read? */
        }
        fclose( fp );
        return (size_t)rss * (size_t)sysconf( _SC_PAGESIZE);

#else
        /* AIX, BSD, Solaris, and Unknown OS ------------------------ */
        return (size_t)0L;                      /* Unsupported. */
#endif
}

#include "wsgi_memory.h"

size_t wsgi_get_peak_memory_RSS(void) { return getPeakRSS(); }
size_t wsgi_get_current_memory_RSS(void) { return getCurrentRSS(); }