linux 下获取CPU,内存,磁盘状态

#include <unistd.h>#include <stdlib.h>#include <stdio.h>#include <sys/sysinfo.h>#include <mntent.h>#include <string.h>#include <errno.h>#include <sys/vfs.h>#include <dirent.h>typedef struct{char* name;unsigned long user;unsigned long nic;unsigned long system;unsigned long idle;}SysCPUInfo;typedef struct{unsigned long MemFree;unsigned long MemTotal;}SysMemInfo;typedef struct{char type[40];char device[40];char mntpnt[40];unsigned long blocks;unsigned long bfree;unsigned long availiable_disk;unsigned long bused;float bused_percent;}DiskInfo;typedef struct{unsigned long Disk_Total;unsigned long Disk_Free;}SysDiskInfo;SysCPUInfo* _GetHostCPUInfo(){SysCPUInfo *cpuinfo = (SysCPUInfo *)malloc(sizeof(SysCPUInfo));FILE *fd;charbuff[256];memset(buff, '\0', 256);fd = fopen("/proc/stat", "r");fgets(buff, sizeof(buff), fd);char name[20];unsigned long user;unsigned long nic;unsigned long system;unsigned long idle;sscanf(buff, "%s %lu %lu %lu %lu", name, &user, &nic, &system, &idle);        cpuinfo->name = name;cpuinfo->user = user;cpuinfo->nic = nic;cpuinfo->system = system;cpuinfo->idle = idle;printf("%s %lu %lu %lu %lu\n",cpuinfo->name,cpuinfo->user,cpuinfo->nic,cpuinfo->system,cpuinfo->idle);fclose(fd);return cpuinfo;}float _CalculateHostCPURate(SysCPUInfo *first, SysCPUInfo *second){unsigned longold_CPU_Time, new_CPU_Time;unsigned longusr_Time_Diff, sys_Time_Diff, nic_Time_Diff;float cpu_use = 0.0;old_CPU_Time = (unsigned long)(first->user + first->nic + first->system + first->idle);new_CPU_Time = (unsigned long)(second->user + second->nic + second->system + second->idle);usr_Time_Diff = (unsigned long)(second->user - first->user);sys_Time_Diff = (unsigned long)(second->system - first->system);nic_Time_Diff = (unsigned long)(second->nic -first->nic);printf("old_CPU_Time = %lu, new_CPU_Time = %lu\n",old_CPU_Time,new_CPU_Time);if ((new_CPU_Time - old_CPU_Time) != 0)  cpu_use = (float)100*(usr_Time_Diff + sys_Time_Diff + nic_Time_Diff)/(new_CPU_Time - old_CPU_Time);else  cpu_use = 0.0;return cpu_use;}float GetHostCPURate(){float cpu_rate;SysCPUInfo *first, *second;first = _GetHostCPUInfo();sleep(1);second = _GetHostCPUInfo();cpu_rate = _CalculateHostCPURate(first, second);/* clean auxiliary memory */free(first);free(second);first = second = NULL;return cpu_rate;}SysMemInfo* GetHostMemInfo(){SysMemInfo *memInfo = (SysMemInfo *)malloc(sizeof(SysMemInfo));struct sysinfo tmp;int ret = 0;ret = sysinfo(&tmp);if (ret == 0) {memInfo->MemFree = (unsigned long)tmp.freeram/(1024*1024);memInfo->MemTotal = (unsigned long)tmp.totalram/(1024*1024);} return memInfo;}SysDiskInfo* GetHostDiskInfo(char* diskName){       printf("%s \n",diskName);SysDiskInfo *sys_disk_info = (SysDiskInfo *)malloc(sizeof(SysDiskInfo));DiskInfo*disk_info;struct statfsfs_info;struct mntent*mnt_info;FILE*fh;floatpercent;unsigned longsum_Total = 0, total_free = 0;if ((fh = setmntent("/etc/mtab", "r")) == NULL) {printf("Cannot open /etc/mtab file!:%s\n",strerror(errno));return NULL;}while ((mnt_info = getmntent(fh)) != NULL) {if (statfs(mnt_info->mnt_dir, &fs_info) < 0) {continue;}if ((disk_info = (DiskInfo *)malloc(sizeof(DiskInfo))) == NULL) {continue;}/*if (strcmp(mnt_info->mnt_type, "proc") &&strcmp(mnt_info->mnt_type, "devfs") &&strcmp(mnt_info->mnt_type, "usbfs") &&strcmp(mnt_info->mnt_type, "sysfs") &&strcmp(mnt_info->mnt_type, "tmpfs") &&strcmp(mnt_info->mnt_type, "devpts") &&strcmp(mnt_info->mnt_type, "fusectl") &&strcmp(mnt_info->mnt_type, "debugfs") &&strcmp(mnt_info->mnt_type, "binfmt_misc") &&strcmp(mnt_info->mnt_type, "fuse.gvfs_fuse_daemon")&&strcmp(mnt_info->mnt_type, "securityfs"))*/if(strcmp(mnt_info->mnt_fsname, diskName) == 0)       {if (fs_info.f_blocks != 0) {percent = (((float)fs_info.f_blocks - (float)fs_info.f_bfree)* 100.0/(float)fs_info.f_blocks);printf("%f\n",percent);} else {percent = 0;}} else {continue;}strcpy(disk_info->type, mnt_info->mnt_type);strcpy(disk_info->device, mnt_info->mnt_fsname);strcpy(disk_info->mntpnt, mnt_info->mnt_dir);unsigned long block_size = fs_info.f_bsize/1024;disk_info->blocks = fs_info.f_blocks * block_size / 1024;disk_info->bfree = fs_info.f_bfree * block_size / 1024;disk_info->availiable_disk = fs_info.f_bavail * block_size / 1024;disk_info->bused = (fs_info.f_blocks - fs_info.f_bfree) * block_size / 1024;disk_info->bused_percent = percent;sum_Total += disk_info->blocks;total_free += disk_info->availiable_disk;/* clean auxiliary memory */free(disk_info);disk_info = NULL;}sys_disk_info->Disk_Total = sum_Total/1024;sys_disk_info->Disk_Free = total_free/1024;return sys_disk_info;}int main(){float cpuRate = GetHostCPURate();SysMemInfo* memInfo = GetHostMemInfo();SysDiskInfo* diskInfo = GetHostDiskInfo("/dev/sda1");printf("cpuRate = %f,meminfo_total = %lu, meminfo_free = %lu, diskinfo_total = %lu,diskinfo_free = %lu",cpuRate,memInfo->MemFree,memInfo->MemTotal,diskInfo->Disk_Total,diskInfo->Disk_Free);}

已在Ubuntu编译运行。