freebsd下计算cpu、memory、hd等相信的代码

/*
 * FreeBSD CPU Information 0.1
 * ---------------------------
 * Simple program to display the total RAM, and CPU information.
 * Compile: cc -o cpuinfo cpuinfo.c
 * ---------------------------
 */

#include
#include
#include
#include
#include
#include

extern int errno;

int main(void)
{
        int len, numcpu, cpuspeed, totalmem, usermem;
        char cpuarch[64], cpumodel[64];

        printf("FreeBSD CPU Information\n");
        printf("Version 0.1\n");

        len = sizeof(cpuarch);
        if (sysctlbyname("hw.machine_arch", &cpuarch, &len, NULL, NULL) == -1)
{
                perror("sysctlbyname()");
                return -1;
        }

        len = sizeof(cpumodel);
        if (sysctlbyname("hw.model", &cpumodel, &len, NULL, NULL) == -1) {
                perror("sysctlbyname()");
                return -1;
        }

        len = sizeof(cpuspeed);
        if (sysctlbyname("machdep.tsc_freq", &cpuspeed, &len, NULL, NULL) ==
-1) {
                perror("sysctlbyname()");
                return -1;
        }

        len = sizeof(numcpu);
        if (sysctlbyname("hw.ncpu", &numcpu, &len, NULL, NULL) == -1) {
                perror("sysctlbyname()");
                return -1;
        }

        len = sizeof(totalmem);
        if (sysctlbyname("hw.physmem", &totalmem, &len, NULL, NULL) == -1) {
                perror("sysctlbyname()");
                return -1;
        }

        len = sizeof(usermem);
        if (sysctlbyname("hw.usermem", &usermem, &len, NULL, NULL) == -1) {
                perror("sysctlbyname()");
                return -1;
        }

        cpuspeed = cpuspeed / 1000000;
        totalmem = (totalmem - 1000000) / 1000000;
        usermem = (usermem - 1000000) / 1000000;

        printf("Architecture:\t%s\n", cpuarch);
        printf("Number of CPUs:\t%d\n", numcpu);
        printf("CPU Model:\t%s\n", cpumodel);
        printf("CPU Speed:\t%dMHz\n", cpuspeed);
        printf("Total Memory:\t%dMB\n", totalmem);
        printf("User Memory:\t%dMB\n", usermem);
        printf("\n");

        return 0;
}