linux检测全缓冲区大小

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

int main() {
    struct stat fileStat;
    if(stat("example.txt", &fileStat) < 0)    // 获取文件状态
        perror("Error getting file stats");

    printf("Recommended I/O block size: %ld bytes\n", fileStat.st_blksize);
    return 0;
}

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

int main() {
    FILE *file = fopen("example.txt", "rb");
    if (!file) {
        perror("Error opening file");
        return 1;
    }

    char buffer[4096];
    size_t bytesRead;
    for (size_t size = 1; size <= 4096; size *= 2) {
        bytesRead = fread(buffer, 1, size, file);
        if (bytesRead < size) {
            printf("Buffer size of %zu bytes detected\n", size / 2);
            break;
        }
    }

    fclose(file);
    return 0;
}