linux+c+获取cpu个数

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int get_cpu_count() {
    FILE *fp;
    char line[128];
    int count = 0;

    fp = fopen("/proc/cpuinfo", "r");
    if (fp == NULL) {
        perror("Failed to open /proc/cpuinfo");
        return -1;
    }

    while (fgets(line, sizeof(line), fp)) {
        if (strncmp(line, "processor", 9) == 0) {
            count++;
        }
    }

    fclose(fp);
    return count;
}

int main() {
    int cpu_count = get_cpu_count();
    if (cpu_count >= 0) {
        printf("Number of CPUs: %d\n", cpu_count);
    } else {
        printf("Unable to determine the number of CPUs.\n");
    }
    return 0;
}