1 X86 linux获取cpu ID

我们在x86 Linux中可以在命令行中用如下命令来得到cpu ID

dmidecode -t 4 | grep ID

如果想在代码中实现，用如下代码

static inline char* skip_ws(const char *p)
{
	while (isspace(*p)) p++;
	return (char *)p;
}

static inline char* skip_token(const char *p)
{
	while (isspace(*p)) p++;
	while (*p && !isspace(*p)) p++;
	return (char *)p;
}


int GetCpuIdByAsm(char* cpu_id)
{
   	char cpuId[40]={0};
	size_t length = 0;
	FILE * fp = popen("dmidecode -t 4 | grep ID", "r");
	if (fp)
	{
		char* ci = fgets(cpuId, sizeof(cpuId) - 1, fp); 
		if (ci)
		{
			char* pstr = skip_ws(skip_token(cpuId));
			char* pchar = pstr;
			while(*pchar) 
			{
				if(*pchar == ' ' ) 
				{ // is space
					*pchar++ = '-';
				} 
				else 
				{
					++pchar;
				}
			}

			memcpy(cpu_id, pstr, strlen(cpuId));
		}
		else
		{
			return -1;
		}

		pclose(fp);
	}

	return 0;
}

2 ARM linux获取cpu ID

在ARM Linux中我们在命令行中使用如下命令得到cpu ID,

cat /proc/cpuinfo | grep Serial

如果想用代码实现，可以用如下代码?

int GetCpuIdByAsm(char* cpu_id)
{
    FILE *fp = fopen("/proc/cpuinfo", "r");
    if(NULL == fp)
        printf("failed to open cpuinfo\n");
    char cpuSerial[100] = {0};

    while(!feof(fp))
    {
        memset(cpuSerial, 0, sizeof(cpuSerial));
        fgets(cpuSerial, sizeof(cpuSerial) - 1, fp); // leave out \n
        
        char* pch = strstr(cpuSerial,"Serial");
        if (pch)
        {
            char* pch2 = strchr(cpuSerial, ':');
            if (pch2)
            {	
                memmove(cpu_id, pch2 + 2, strlen(cpuSerial));

                break;
            } 
            else
            {
				return -1;
            }
        }
    }
    fclose(fp);

    return 0;
}

?3 获取cpu name

无论是X86 linux还是ARM Linux，我们都可以在命令行中使用如下命令得到cpu name,

cat /proc/cpuinfo | grep  model

如果想在代码中实现可以使用如下代码?

int GetCpuInfo(char* cpuName)
{
    FILE *fp = fopen("/proc/cpuinfo", "r");
    if(NULL == fp)
        printf("failed to open cpuinfo\n");
    char cpuModel[100] = {0};

    while(!feof(fp))
    {
        memset(cpuModel, 0, sizeof(cpuModel));
        fgets(cpuModel, sizeof(cpuModel) - 1, fp); // leave out \n
        
        char* pch = strstr(cpuModel,"model name");
        if (pch)
        {
            char* pch2 = strchr(cpuModel, ':');
            if (pch2)
            {	
                memmove(cpuName, pch2 + 2, strlen(cpuModel));

                break;
            } 
            else
            {
				return -1;
            }
        }
    }
    fclose(fp);

    return 0;
}