Linux下用来获取各种系统信息的C++类
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时间：2015年06月08日
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下面是头文件内容，代码是mooon的一部分，对应的CPP文件请直接浏览：http://code.google.com/p/mooon/source/browse/trunk/common_library/src/sys/info.cpp
#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
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