#include <vector>   
#include "sys/config.h"   
SYS_NAMESPACE_BEGIN   
        
/***   
  * 用来获取系统、内核和进程的各类实时信息，如CPU和内存数据   
  */
class CInfo   
{   
public:   
    /***   
      * 系统当前实时信息   
      */
    typedef struct
    {   
        long uptime_second;             /* Seconds since boot */
        unsigned long average_load[3];  /* 1, 5, and 15 minute load averages */
        unsigned long ram_total;        /* Total usable main memory size */
        unsigned long ram_free;         /* Available memory size */
        unsigned long ram_shared;       /* Amount of shared memory */
        unsigned long ram_buffer;       /* Memory used by buffers */
        unsigned long swap_total;       /* Total swap space size */
        unsigned long swap_free;        /* swap space still available */
        unsigned short process_number;  /* Number of current processes */
    }sys_info_t;   
        
    /***   
      * 当前进程时间信息   
      */
    typedef struct
    {   
        long user_time;             /* user time */
        long system_time;          /* system time */
        long user_time_children;    /* user time of children */
        long system_time_children; /* system time of children */
    }process_time_t;   
        
    /***   
      * 当前系统CPU信息   
      */
    typedef struct
    {   
        // 单位: jiffies, 1jiffies=0.01秒   
        uint64_t total;   
        uint32_t user;    /** 从系统启动开始累计到当前时刻，处于用户态的运行时间，不包含 nice值为负进程 */
        uint32_t nice;    /** 从系统启动开始累计到当前时刻，nice值为负的进程所占用的CPU时间 */
        uint32_t system;  /** 从系统启动开始累计到当前时刻，处于核心态的运行时间 */
        uint32_t idle;    /** 从系统启动开始累计到当前时刻，除IO等待时间以外的其它等待时间 */
        uint32_t iowait;  /** 从系统启动开始累计到当前时刻，IO等待时间(2.5.41) */
        uint32_t irq;     /** 从系统启动开始累计到当前时刻，硬中断时间(2.6.0) */
        uint32_t softirq; /** 从系统启动开始累计到当前时刻，软中断时间(2.6.0) */
        //uint32_t stealstolen; /** which is the time spent in other operating systems when running in a virtualized environment(2.6.11) */   
        //uint32_t guest;       /** which is the time spent running a virtual  CPU  for  guest operating systems under the control of the Linux kernel(2.6.24) */   
    }cpu_info_t;   
        
    /***   
      * 当前系统内存信息   
      */
    typedef struct
    {   
        uint32_t mem_total;   
        uint32_t mem_free;   
        uint32_t buffers;   
        uint32_t cached;   
        uint32_t swap_cached;   
        uint32_t swap_total;   
        uint32_t swap_free;   
    }mem_info_t;   
        
    /***   
      * 内核版本号   
      */
    typedef struct
    {   
        int16_t major;    /** 主版本号 */
        int16_t minor;    /** 次版本号(如果次版本号是偶数，那么内核是稳定版；若是奇数则是开发版) */
        int16_t revision; /** 修订版本号 */
    }kernel_version_t;   
        
    /***   
      * 当时进程状态信息   
      *   
      * 进程的状态值:   
        D    Uninterruptible sleep (usually IO)   
        R    Running or runnable (on run queue)   
        S    Interruptible sleep (waiting for an event to complete)   
        T    Stopped, either by a job control signal or because it is being traced.   
        W    paging (not valid since the 2.6.xx kernel)   
        X    dead (should never be seen)   
        Z    Defunct ("zombie") process, terminated but not reaped by its parent.   
      */
    typedef struct
    {   
        /** 01 */ pid_t pid;                     /** 进程号，其允许的最大值，请查看/proc/sys/kernel/pid_max */
        /** 02 */ char comm[FILENAME_MAX];       /** 进程的名字，不包括路径 */
        /** 03 */ char state;                    /** 进程的状态 */
        /** 04 */ pid_t ppid;                    /** 父进程号 */
        /** 05 */ pid_t pgrp;                    /** 进程组号 */
        /** 06 */ pid_t session;                 /** 进程会话号 */
        /** 07 */ int tty_nr;                    /** The tty the process uses */
        /** 08 */ pid_t tpgid;                   /** The tty the process uses */
        /** 09 */ unsigned int flags;            /** The kernel flags word of the process (%lu before Linux 2.6.22) */
        /** 10 */ unsigned long minflt;          /** The number of minor faults the process has made which have not required loading a memory page from disk */
        /** 11 */ unsigned long cminflt;         /** The number of minor faults that the process‘s waited-for children have made */
        /** 12 */ unsigned long majflt;          /** The number of major faults the process has made which have required loading a memory page from disk */
        /** 13 */ unsigned long cmajflt;         /** The number of major faults that the process‘s waited-for children have made */
        /** 14 */ unsigned long utime;           /** The number of jiffies that this process has been scheduled in user mode */
        /** 15 */ unsigned long stime;           /** The number of jiffies that this process has been scheduled in kernel mode */
        /** 16 */ long cutime;                   /** The  number  of  jiffies that this process‘s waited-for children have been scheduled in user mode */
        /** 17 */ long cstime;                   /** The number of jiffies that this process‘s waited-for children have been scheduled in kernel mode */
        /** 18 */ long priority;                 /** The standard nice value, plus fifteen.  The value is never negative in the kernel */
        /** 19 */ long nice;                     /** The nice value ranges from 19 (nicest) to -19 (not nice to others) */
        /** 20 */ long num_threads;              /** Number of threads in this process (since Linux 2.6).  Before kernel 2.6, this field was hard coded to 0 as a placeholder */
        /** 21 */ long itrealvalue;              /** The  time  in  jiffies before the next SIGALRM is sent to the process due to an interval timer.2.6.17, this field is no longer maintained, and is hard coded as 0 */
        /** 22 */ long long starttime;           /** The time in jiffies the process started after system boot */
        /** 23 */ unsigned long vsize;           /** Virtual memory size in bytes */
        /** 24 */ long rss;                      /** Resident Set Size: number of pages the process has in real memory, minus 3 for administrative purposes */
        /** 25 */ unsigned long rlim;            /** Current limit in bytes on the rss of the process (usually 4294967295 on i386) */
        /** 26 */ unsigned long startcode;       /** The address above which program text can run */
        /** 27 */ unsigned long endcode;         /** The address below which program text can run */
        /** 28 */ unsigned long startstack;      /** The address of the start of the stack */
        /** 29 */ unsigned long kstkesp;         /** The current value of esp (stack pointer), as found in the kernel stack page for the process */
        /** 30 */ unsigned long kstkeip;         /** The current EIP (instruction pointer) */
        /** 31 */ unsigned long signal;          /** The bitmap of pending signals */
        /** 32 */ unsigned long blocked;         /** The bitmap of blocked signals */
        /** 33 */ unsigned long sigignore;       /** The bitmap of ignored signals */
        /** 34 */ unsigned long sigcatch;        /** The bitmap of caught signals */
        /** 35 */ unsigned long nswap;           /** Number of pages swapped (not maintained). */
        /** 36 */ unsigned long cnswap;          /** Cumulative nswap for child processes (not maintained) */
        /** 37 */ int exit_signal;               /** Signal to be sent to parent when we die (since Linux 2.1.22) */
        /** 38 */ int processor;                 /** CPU number last executed on (since Linux 2.2.8) */
    }process_info_t;   
        
    /***   
      * 网卡流量数据结构   
      */
    typedef struct
    {   
        /** 01 */ char interface_name[INTERFACE_NAME_MAX]; /** 网卡名，如eth0 */
        
                  /** 接收数据 */
        /** 02 */ unsigned long receive_bytes;             /** 此网卡接收到的字节数 */
        /** 03 */ unsigned long receive_packets;   
        /** 04 */ unsigned long receive_errors;   
        /** 05 */ unsigned long receive_dropped;   
        /** 06 */ unsigned long receive_fifo_errors;   
        /** 07 */ unsigned long receive_frame;   
        /** 08 */ unsigned long receive_compressed;   
        /** 09 */ unsigned long receive_multicast;   
        
                  /** 发送数据 */
        /** 10 */ unsigned long transmit_bytes;             /** 此网卡已发送的字节数 */
        /** 11 */ unsigned long transmit_packets;   
        /** 12 */ unsigned long transmit_errors;   
        /** 13 */ unsigned long transmit_dropped;   
        /** 14 */ unsigned long transmit_fifo_errors;   
        /** 15 */ unsigned long transmit_collisions;   
        /** 16 */ unsigned long transmit_carrier;   
        /** 17 */ unsigned long transmit_compressed;           
    }net_info_t;   
        
    /***   
      * 进程页信息结构   
      */
    typedef struct
    {   
        long size;     /** 程序大小 */
        long resident; /** 常驻内存空间大小 */
        long share;    /** 共享内存页数 */
        long text;     /** 代码段占用内存页数 */
        long lib;      /** 数据/堆栈段占用内存页数 */
        long data;     /** 引用库占用内存页数 */
    }process_page_info_t;   
        
public:   
    /** 获取系统信息，具体请参考sys_info_t的描述 */
    static bool get_sys_info(sys_info_t& sys_info);   
        
    /** 获取内存信息，具体请参考mem_info_t的描述 */
    static bool get_mem_info(mem_info_t& mem_info);   
        
    /** 获取总CPU信息，具体请参考cpu_info_t的描述 */
    static bool get_cpu_info(cpu_info_t& cpu_info);   
        
    /** 获取所有CPU信息，具体请参考cpu_info_t的描述 */
static int get_cpu_info_array(std::vector<cpu_info_t>& cpu_info_array);   
        
    /** 得到内核版本号 */
    static bool get_kernel_version(kernel_version_t& kernel_version);   
        
    /** 获取进程信息，具体请参考process_info_t的描述 */
    static bool get_process_info(process_info_t& process_info);   
        
    /** 获取进程页信息，具体请参考process_page_info_t的描述 */
    static bool get_process_page_info(process_page_info_t& process_page_info);   
        
    /** 获取进程运行时间数据，具体请参考process_time_t的描述 */
    static bool get_process_times(process_time_t& process_time);   
               
    /***   
      * 获取网卡流量等信息   
      * 流量 = (当前获取的值 - 上一时间获取的值) / 两次间隔的时长   
      * @interface_name: 网卡名，如eth0等   
      * @net_info: 存储网卡流量等数据   
      */
    static bool get_net_info(const char* interface_name, net_info_t& net_info);   
    static bool get_net_info_array(std::vector<net_info_t>& net_info_array);       
        
private:   
    static bool do_get_net_info_array(const char* interface_name, std::vector<net_info_t>& net_info_array);   
};   
        
SYS_NAMESPACE_END

Linux下用来获取各种系统信息的C++类