c_cpp 快速代码片段，用于在统计（阻止）/ dev / rdsk中的设备时验证fstat64和stat64的行为。

Posted 2021-05-14

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

#include <sys/stat.h>

int status, fd;
struct stat64 buf;

const char *fp = "/dev/rdsk/c2t0d0" ;
const char *fpp0 = "/dev/rdsk/c2t0d0p0" ;
char *fpi;

void print_info (char *mydev) {
    if ((fd = open64(mydev, O_RDONLY | O_NDELAY)) == -1) {
        printf("Failed to open: %s\n", mydev);
    }

    if ((status = stat64(mydev, &buf)) == -1) {
        printf("stat64 Failed to stat: %s\n", mydev);
    } else {
        printf("stat64: %s size: 0x%lx(KB)\n", mydev, 
                (intmax_t)buf.st_size >> 10);
    }

    if ((status = fstat64(fd, &buf)) == -1) {
        printf("fstat64 Failed to stat: %s\n", mydev);
    } else {
        printf("fstat64: %s size: 0x%lx(KB)\n", mydev, 
                (intmax_t)buf.st_size >> 10);
    }
    close(fd);
}

int main(void) {
    char *fpi = (char *)malloc(32);
    for (int i = 0 ; i < 16; i++) {
        sprintf(fpi, "%ss%d", fp, i);
    print_info(fpi);
    }
    print_info((char *)fpp0);
    return (0);
}