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linux系统状态(磁盘大小、内存、进程、cpu使用率、网络连接)

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分享一下自己做的一个获取Linux系统状态的类(c++)

使用方式:声明一个该类的变量(即实例化),用实例调用相关接口即可。

头文件:

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#ifndef LINUXSERVERSTATE_H
#define LINUXSERVERSTATE_H
#include <sys/types.h>
#include <unistd.h>
#include <string>
#include <vector>
#include <pthread.h>
namespace LINUXSERV_STATE
{
#pragma pack(push)
#pragma pack(8)
struct SysMemInfo
{
  unsigned long total;//单位:M
  unsigned long free;//单位:M
};
struct SysDiskInfo
{
  std::string   name;//sda1,sad2等等
  unsigned long total;//单位:M,不包括交换分区、CDROM等
  unsigned long free;//单位:M
};
struct SysNetInfo
{
  float send;//kb
  float recv;//kb
  float total;//kb
};
struct SysProcInfo
{
  std::string   name;//进程名字
  int           pid;//进程id
  int           cpu;//cpu使用率
  long      mem;//内存使用,单位Kb,linux内存指的是vmrss,即程序正在使用的物理内存,-1表示未获取到或获取错误
};
struct SysProcTimeInfo
{
  unsigned long user;//进程在用户态执行的时间
  unsigned long kernel;//进程在内核态执行的时间
};
//linux src目录中的include/net/tcp_states.h,source目录一般位于/usr/src/linux*目录中
enum SysNetState{
  TCP_ESTABLISHED = 1,
  TCP_SYN_SENT,
  TCP_SYN_RECV,
  TCP_FIN_WAIT1,
  TCP_FIN_WAIT2,
  TCP_TIME_WAIT,
  TCP_CLOSE,
  TCP_CLOSE_WAIT,
  TCP_LAST_ACK,
  TCP_LISTEN,
  TCP_CLOSING,    /* Now a valid state */
  TCP_MAX_STATES  /* Leave at the end! */
};
enum SockType{UNKNOWN=0,TCP , UDP, TCP6, UDP6};
struct SysNetConnInfo
{
  int               id;
  SockType  protocol;
  std::string   localAddr;
  int               localPort;
  std::string   remoteAddr;
  int               remotePort;
  SysNetState   state;
};
#pragma pack(pop)
void* CPUNetProcessCount(void* arg);
class LinuxServerState
{
public:
    LinuxServerState();
    virtual     ~LinuxServerState();
                    
    int     GetMemInfo(SysMemInfo& memInfo);
    int     GetDiskInfo(std::vector<SysDiskInfo>& diskInfo,unsigned long &total,unsigned long &available);
    //返回cpu的利用率,返回-1表示超时或者其他错误
    int     GetCpuUsage();
    //sys net info
    SysNetInfo  GetNetInfo();
    //process info
    void    GetProcInfo(std::vector<SysProcInfo>& procInfo);
    //net connection info
    void    GetNetConnectionInfo(std::vector<SysNetConnInfo>& netConnInfo);
private:
    void    initialize();
    friend  void* CPUNetProcessCount(void* arg);
    int     m_cpuUsage; //多个CPU的总的使用率
    pthread_mutex_t m_mutex;
    SysNetInfo  m_netInfo;
    pthread_t   m_countThread;
    std::vector<SysProcInfo>  m_procInfo;
    void*   m_threadRet;
    LinuxServerState(const LinuxServerState& other);
    virtual     LinuxServerState& operator=(const LinuxServerState& other);
    virtual     bool operator==(const LinuxServerState& other) const;
};
}
#endif // LINUXSERVERSTATE_H

源文件:

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#include "linuxserverstate.h"
#include <sys/sysinfo.h>//getmemInfo
#include <stdio.h>
#include <stdlib.h>
#include <fstream>
#include <climits>
#include <cstring>
#include <time.h>
#include <dirent.h>
#include <map>
#include <errno.h>
#include <iostream>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
using namespace std;
namespace LINUXSERV_STATE
{
void* CPUNetProcessCount(void* arg)
{
    LinuxServerState* pMain = (LinuxServerState*)arg;
    //get all cpu usage
    unsigned long cpuTime, idleTime;
    unsigned long    userT = 0, niceT = 0, systemT = 0, idleT = 0, ioT = 0, irqT = 0, softirqT = 0;
    char         cpubuf[8] = {'\0'};
    fstream          fProcStat("/proc/stat",ios_base::in);
    fProcStat>>cpubuf>>userT>>niceT>>systemT>>idleT>>ioT>>irqT>>softirqT;
    cpuTime = userT + niceT + systemT + idleT + ioT + irqT + softirqT;
    idleTime = idleT;
    //get net stat
    fstream          fProcNetStat("/proc/net/netstat",ios_base::in);
    char         bufNetStat[2048] = {'\0'}, ipExt[16] = {'\0'};
    unsigned long    inNoRoutes = 0, inTruncPkts = 0, inMcastPkts = 0, outMcastPkts = 0, inBcastPkts = 0, outBcastPkts = 0;
    unsigned long    inOctets = 0, outOctets = 0, inMcastOctets = 0, outMcastOctets = 0, inBcastOctets = 0, outBcastOctets = 0;
    time_t       sysTime;
    while(!fProcNetStat.eof())
    {
      fProcNetStat.getline(bufNetStat,2048);
      if(strncasecmp(bufNetStat,"tcpext",6) == 0)
    continue;
      if(strncasecmp(bufNetStat,"ipext",5) == 0)
      {
    fProcNetStat.getline(bufNetStat,2048);
    sscanf(bufNetStat,"%s %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld",ipExt,
           &inNoRoutes,&inTruncPkts,&inMcastPkts,&outMcastPkts,&inBcastPkts,&outBcastPkts,
        &inOctets,&outOctets,&inMcastOctets,&outMcastOctets,&inBcastOctets,&outBcastOctets);
    sysTime = time(NULL);
    break;
      }
    }
    //initialize proc info
    char dirName[128] = {'\0'},tmpbuf[2048] = {'\0'};
    long utime, stime;
                        
    struct dirent* ent = NULL;
    char pidBuf[128] = {'\0'}, *endptr;
    DIR* pDirProc = opendir("/proc");
    map<pid_t,SysProcTimeInfo>    procTimeInfo;
    if(pDirProc == NULL)
      return NULL;
    while((ent = readdir(pDirProc))!= NULL)
    {
      long pidNum = strtol(ent->d_name,&endptr,10);
      if(pidNum == LONG_MAX || pidNum == LONG_MIN || endptr == ent->d_name)
      {
    continue;
      }
      else
      {
    //初始化时间
    fstream fPidStat,fPidMem;
    int i = 0;
    SysProcTimeInfo tmpProcTimeInfo;
    SysProcInfo tmpProcInfo;
    snprintf(dirName,128,"%s%d%s","/proc/",pidNum,"/stat");
    try
    {
      fPidStat.open(dirName,ios_base::in);
    }
    catch(std::exception& e)
    {
      return NULL;
    }
    fPidStat>>tmpbuf;//获取pid
    i++;
    fPidStat>>tmpbuf;//获取进程名字,名字由“()”包括
    i++;
    if(strlen(tmpbuf) > 2)
      tmpProcInfo.name  = string(tmpbuf).substr(1,strlen(tmpbuf) -2);
    else
      continue;
    for(; i < 14;i++)
      fPidStat>>tmpbuf;
                        
    //14项表示utime,15项表示stime
    fPidStat >> utime;
    i++;
    fPidStat >> stime;
    i++;
    tmpProcTimeInfo.user    = utime;
    tmpProcTimeInfo.kernel  = stime;
    utime           = 0;
    stime           = 0;
                        
    procTimeInfo.insert(pair<pid_t,SysProcTimeInfo>(pidNum,tmpProcTimeInfo));
    tmpProcInfo.cpu = 0;
    tmpProcInfo.pid = pidNum;
                        
    //初始化内存,
    char *pstrtolong;
    memset(dirName,'\0',128);
    snprintf(dirName,128,"%s%d%s","/proc/",pidNum,"/status");
    fPidMem.open(dirName,ios_base::in);
    while(!fPidMem.eof())
    {
      fPidMem >> tmpbuf;
      if(strncasecmp(tmpbuf,"vmrss",5) == 0)
      {
        fPidMem >> tmpbuf;
        unsigned long vmrss = strtol(tmpbuf,&pstrtolong,10);
        if(vmrss == LONG_MAX || vmrss == LONG_MIN || pstrtolong == tmpbuf)
        {
          tmpProcInfo.mem = -1;
        }
        else
          tmpProcInfo.mem = vmrss;
        if(0 == pthread_mutex_trylock(&pMain->m_mutex))
        {
          pMain->m_procInfo.push_back(tmpProcInfo);
          pthread_mutex_unlock(&pMain->m_mutex);
        }
        break;
      }
    }
                        
    memset(dirName,'\0',128);
    memset(tmpbuf,'\0',2048);
      }
    }
    closedir(pDirProc);
    pDirProc    = NULL;
    while(1)
    {
      sleep(1);
      //cpu usage
      unsigned long cpuTimeNow = 0, idleTimeNow = 0;
      int cpu = 0;
      fProcStat.seekg(0,ios_base::beg);
      fProcStat>>cpubuf>>userT>>niceT>>systemT>>idleT>>ioT>>irqT>>softirqT;
      cpuTimeNow = userT + niceT + systemT + idleT + ioT + irqT + softirqT;
      idleTimeNow = idleT;
                          
      cpu = 100 - (idleTimeNow - idleTime)*100/(cpuTimeNow - cpuTime);
      idleTime  = idleTimeNow;
      cpuTime   = cpuTimeNow;
      if(0 == pthread_mutex_trylock(&pMain->m_mutex))
      {
    pMain->m_cpuUsage = cpu;
    pthread_mutex_unlock(&pMain->m_mutex);
      }
      //else暂时不处理
      //net stat
      unsigned long inOctetsTmp = 0,outOctetsTmp = 0;
      fProcNetStat.seekg(0,ios_base::beg);
      time_t    timeNow = time(NULL);
      while(!fProcNetStat.eof())
      {
    fProcNetStat.getline(bufNetStat,2048);
    if(strncasecmp(bufNetStat,"tcpext",6) == 0)
      continue;
    if(strncasecmp(bufNetStat,"ipext",5) == 0)
    {
      fProcNetStat.getline(bufNetStat,2048);
      sscanf(bufNetStat,"%s %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld",ipExt,
        &inNoRoutes,&inTruncPkts,&inMcastPkts,&outMcastPkts,&inBcastPkts,&outBcastPkts,
        &inOctetsTmp,&outOctetsTmp,&inMcastOctets,&outMcastOctets,&inBcastOctets,&outBcastOctets);
      timeNow = time(NULL);
      break;
    }
      }
      SysNetInfo tmpNetInfo;
      tmpNetInfo.recv = (inOctetsTmp - inOctets)/1024/(timeNow - sysTime);
      tmpNetInfo.send = (outOctetsTmp - outOctets)/1024/(timeNow - sysTime);
      tmpNetInfo.total = tmpNetInfo.recv + tmpNetInfo.send;
                          
      sysTime   = timeNow;
      inOctets  = inOctetsTmp;
      outOctets = outOctetsTmp;
      if(0 == pthread_mutex_trylock(&pMain->m_mutex))
      {
    pMain->m_netInfo = tmpNetInfo;
    pthread_mutex_unlock(&pMain->m_mutex);
      }
      //proc info
      if(0 == pthread_mutex_trylock(&pMain->m_mutex))
      {
    pMain->m_procInfo.clear();
    pthread_mutex_unlock(&pMain->m_mutex);
      }
      pDirProc = opendir("/proc");
      while((ent = readdir(pDirProc))!= NULL)
      {
    long pidNum = strtol(ent->d_name,&endptr,10);
    if(pidNum == LONG_MAX || pidNum == LONG_MIN || endptr == ent->d_name)
    {
      continue;
    }
    else
    {
      //初始化时间
      fstream fPidStat,fPidMem;
      int i = 0;
      snprintf(dirName,128,"%s%d%s","/proc/",pidNum,"/stat");
      fPidStat.open(dirName,ios_base::in);
      fPidStat>>tmpbuf;//获取pid
      i++;
      fPidStat>>tmpbuf;//获取进程名字,名字由“()”包括
      i++;
      SysProcInfo   tmpProcInfo;
      if(strlen(tmpbuf) > 2)
        tmpProcInfo.name    = string(tmpbuf).substr(1,strlen(tmpbuf) -2);
      else
        cout<<"pid:\t"<<pidNum<<"tmpbuf:\t"<<tmpbuf<<endl;
      for(; i < 14;i++)
      {
        fPidStat>>tmpbuf;
      }
      //14项表示utime,15项表示stime
      fPidStat >> utime;
      fPidStat >> stime;
      map<pid_t,SysProcTimeInfo>::iterator it = procTimeInfo.find((pid_t)pidNum);
      if(it == procTimeInfo.end())
      {
        SysProcTimeInfo tmpProcTimeInfo;
        tmpProcTimeInfo.user    = utime;
        tmpProcTimeInfo.kernel  = stime;
        procTimeInfo.insert(pair<pid_t,SysProcTimeInfo>(pidNum,tmpProcTimeInfo));
        tmpProcInfo.cpu = 0;
      }
      else
      {
        tmpProcInfo.cpu = utime + stime - it->second.kernel - it->second.user;
        if(tmpProcInfo.cpu > 100)
          tmpProcInfo.cpu = 100;
        if(tmpProcInfo.cpu < 0)
          tmpProcInfo.cpu = 0;
        it->second.kernel    = stime;
        it->second.user  = utime;
      }
      utime         = 0;
      stime         = 0;
      tmpProcInfo.pid   = pidNum;
      //获取内存
      char *pstrtolong;
      memset(dirName,'\0',128);
      snprintf(dirName,128,"%s%d%s","/proc/",pidNum,"/status");
      fPidMem.open(dirName,ios_base::in);
      while(!fPidMem.eof())
      {
        fPidMem >> tmpbuf;
        if(strncasecmp(tmpbuf,"vmrss",5) == 0)
        {
          fPidMem >> tmpbuf;
          unsigned long vmrss = strtol(tmpbuf,&pstrtolong,10);
          if(vmrss == LONG_MAX || vmrss == LONG_MIN || pstrtolong == tmpbuf)
          {
        tmpProcInfo.mem = -1;
          }
          else
        tmpProcInfo.mem = vmrss;
          if(0 == pthread_mutex_trylock(&pMain->m_mutex))
          {
        pMain->m_procInfo.push_back(tmpProcInfo);
        pthread_mutex_unlock(&pMain->m_mutex);
          }
          break;
        }
      }
      memset(dirName,'\0',128);
      memset(tmpbuf,'\0',2048);
    }
      }
      closedir(pDirProc);
    }//main
                        
    return NULL;
}
LinuxServerState::LinuxServerState()
{
  m_cpuUsage        = 0;
  m_countThread     = 0;
  m_threadRet       = NULL;
  m_netInfo.total   = 0;
  m_netInfo.recv    = 0;
  m_netInfo.send    = 0;
  initialize();
}
LinuxServerState::LinuxServerState(const LinuxServerState& other)
{
}
LinuxServerState::~LinuxServerState()
{
  if(m_countThread != 0)
    pthread_join(m_countThread,NULL);
  pthread_mutex_destroy(&m_mutex);
}
LinuxServerState& LinuxServerState::operator=(const LinuxServerState& other)
{
    return *this;
}
bool LinuxServerState::operator==(const LinuxServerState& other) const
{
///TODO: return ...;
}
void LinuxServerState::initialize()
{
  //pthread_mutexatt matt;
  //pthread_mutexattr_init(&matt);
                      
  pthread_mutex_init(&m_mutex,NULL);
  pthread_create(&m_countThread,NULL,&CPUNetProcessCount,this);
}
int LinuxServerState::GetCpuUsage()
{
  timespec  tmp;
  tmp.tv_nsec   = 0;
  tmp.tv_sec    = 1;
  int cpu   = 0;
  if(0 == pthread_mutex_timedlock(&m_mutex,&tmp))
  {
    cpu     = m_cpuUsage;
    pthread_mutex_unlock(&m_mutex);
  }
  else
    return -1;
  if(cpu > 100)
    return 100;
  if(cpu < 0)
    return 0;
  return cpu;
}
int LinuxServerState::GetMemInfo(SysMemInfo& memInfo)
{
  struct sysinfo    tmp;
  int           ret = 0;
  ret  =        sysinfo(&tmp);
  if(ret == 0)
  {
    memInfo.free    = (unsigned long)tmp.freeram/(1024*1024);
    memInfo.total   = (unsigned long)tmp.totalram/(1024*1024);
  }
  return ret;
}
int LinuxServerState::GetDiskInfo(std::vector<SysDiskInfo>& diskInfo,unsigned long &total,unsigned long &available)
{
  total     = 0;
  available = 0;
  char      buf[128] = {'\0'};
  string    fileName;
  char      *p;
  fstream   fProc("/proc/partitions",ios_base::in);
  unsigned long total2 = 0, free2 = 0, sumTotal = 0, sumFree = 0;
  int       major = 0, minor = 0;
  //首先计算总大小及各个分区的大小,包括交换分区,然后用df命令获取可用空间
  while(!fProc.eof())
  {
    fProc>>fileName;
    total2  = strtol(fileName.c_str(),&p,10);
    if(total2 == 0)
      continue;
    else if(total2 == LONG_MAX || total2 == LONG_MIN || p == fileName.c_str())
      return total2;
    else
    {
      major     = total2;
      fProc>>minor;
      fProc>>total2;
                          
      fProc>>fileName;
                          
      SysDiskInfo tmp;
      tmp.total = (unsigned long)(total2/1024);
      tmp.free  = 0;
      tmp.name  = fileName;
                         
      diskInfo.push_back(tmp);
      if((fileName.find("sd")!= string::npos || fileName.find("hd") != string::npos) &&
    !(fileName[fileName.size()-1] >='0' &&  fileName[fileName.size()-1] <='9'))
    sumTotal += tmp.total;
      fileName.clear();
    }
  }
  //获取可用空间
  const char        *command = "df";
  const char        *type    = "r";
  FILE  *pFile      = popen(command,type);
  char  buf2[1024]  = {'\0'};
  char  filesys[32] = {'\0'}, usage[8] = {'\0'}, mountedon[32] = {'\0'};
  unsigned long kblocks = 0, used = 0, available2 = 0;
  if(pFile == NULL)
    return -1;
  vector<SysDiskInfo>::iterator it;
  while (!feof (pFile) )
  {
      if (fgets (buf2 , 1024 , pFile) == NULL )
    break;
      sscanf(buf2,"%s %ld %ld %ld %s %s",filesys,&kblocks,&used,&available2,usage,mountedon);
      string ff(filesys);
      if(ff.rfind("/") == string::npos)
    continue;
      for(it = diskInfo.begin(); it != diskInfo.end();it++)
      {
    if(it->name == ff.substr(ff.rfind("/")+1))
    {
      it->free   = (unsigned long)(available2/1024);
      sumFree   += it->free;
    }
      }
      memset(buf2,'\0',1024);
      memset(filesys,'\0',32);
      memset(mountedon,'\0',32);
      memset(usage,'\0',8);
      kblocks   = 0;
      used  = 0;
      available2 = 0;
  }
  pclose(pFile);
  total     = sumTotal;
  available     = sumFree;
  return 0;
}
SysNetInfo LinuxServerState::GetNetInfo()
{
  SysNetInfo    tmpNetInfo;
  tmpNetInfo.recv   = 0;
  tmpNetInfo.send   = 0;
  tmpNetInfo.total  = 0;
  timespec  tmp;
  tmp.tv_nsec   = 0;
  tmp.tv_sec    = 1;
  if(0 == pthread_mutex_timedlock(&m_mutex,&tmp))
  {
    tmpNetInfo      = m_netInfo;
    pthread_mutex_unlock(&m_mutex);
  }
  return tmpNetInfo;
}
void LinuxServerState::GetProcInfo(std::vector<SysProcInfo>& procInfo)
{
  timespec  tmp;
  tmp.tv_nsec   = 0;
  tmp.tv_sec    = 1;
                      
  if(0 == pthread_mutex_timedlock(&m_mutex,&tmp))
  {
    procInfo        = m_procInfo;
    pthread_mutex_unlock(&m_mutex);
  }
}
void LinuxServerState::GetNetConnectionInfo(std::vector<SysNetConnInfo>& netConnInfo)
{
  int i = 0,id = 0;
  char buf[1024] = {'\0'};
  while(i++ < 4)
  {
    fstream     fInfo;
    SockType        stateType = UNKNOWN;
                        
    if(i == 1)
    {
      fInfo.open("/proc/net/tcp",ios_base::in);
      stateType  = TCP;
    }
    else if(i == 2)
    {
      fInfo.open("/proc/net/udp",ios_base::in);
      stateType = UDP;
    }
    else if(i == 3)
    {
      fInfo.open("/proc/net/tcp6",ios_base::in);
      stateType = TCP6;
    }
    else if(i == 4)
    {
      fInfo.open("/proc/net/udp6",ios_base::in);
      stateType = UDP6;
    }
    if(stateType == UNKNOWN)
      continue;
                        
    while(!fInfo.eof())
    {
      SysNetConnInfo    tmpConnInfo;
                          
      char sl[6] = {'\0'},localaddr[32] = {'\0'},remoteaddr[32] = {'\0'};
      fInfo.getline(buf,1024);
      unsigned long llocal = 0, lremote = 0;
      int       localPort = 0, remotePort = 0, st = 0;
      int ret;
      if(i == 1 || i == 2)
      {
    ret = sscanf(buf,"%s%x:%x%x:%x%x",sl,&llocal,&localPort,&lremote,&remotePort,&st);
    if(ret != 6)
      continue;
    in_addr         tmpAddr;
    tmpAddr.s_addr      = llocal;
    tmpConnInfo.localAddr   = inet_ntoa(tmpAddr);
    tmpAddr.s_addr      = lremote;
    tmpConnInfo.remoteAddr  = inet_ntoa(tmpAddr);
      }
                          
      else if(i == 3 || i == 4 )
      {
    ret = sscanf(buf,"%s%32s:%x%32s:%x%x",sl,&localaddr,&localPort,&remoteaddr,&remotePort,&st);
    if(ret != 6)
      continue;
    char    tmp[64] = {'\0'};
    int pos = 0;
    for(int j = 0;j < 32; j++)
    {
      tmp[pos++] = localaddr[j];
      if((j % 4) == 3 && j != 31)
        tmp[pos++] = ':';
    }
    tmpConnInfo.localAddr   = string(tmp);
    memset(tmp,'\0',64);
    pos  = 0;
    for(int j = 0;j < 32; j++)
    {
      tmp[pos++] = remoteaddr[j];
      if((j % 4) == 3 && j != 31)
        tmp[pos++] = ':';
    }
    tmpConnInfo.remoteAddr  = string(tmp);
      }
                         
      tmpConnInfo.localPort = localPort;
      tmpConnInfo.remotePort    = remotePort;
      tmpConnInfo.id        = id++;
      tmpConnInfo.protocol  = stateType;
      tmpConnInfo.state     = (SysNetState)st;
      netConnInfo.push_back(tmpConnInfo);
    }
    fInfo.close();
  }
                      
}
}









本文转自 hakuyo 51CTO博客,原文链接:http://blog.51cto.com/hakuyo/1218145,如需转载请自行联系原作者

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