C lstat major MAJOR 获得设备号
2024-08-31 00:55:49
#cat lstat.c
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#define MINORBITS 20
#define MINORMASK ((1U << MINORBITS) - 1)
#define MAJOR(dev) ((unsigned int) ((dev) >> MINORBITS))
#define MINOR(dev) ((unsigned int) ((dev) & MINORMASK))
int main(void)
{
struct stat buf;
lstat("/dev/sdc", &buf);
int a = MAJOR(buf.st_dev);
int b = MINOR(buf.st_dev);
int c = MAJOR(buf.st_rdev);
int d = MINOR(buf.st_rdev);
int e = major(buf.st_rdev);
int f = minor(buf.st_rdev);
int g = major(buf.st_dev);
int h = minor(buf.st_dev);
printf("st_dev MAJOR:%d, MINOR:%d\n", a, b);
printf("st_rdev MAJOR:%d, MINOR:%d\n", c, d);
printf("st_dev major:%d, minor:%d\n", g, h);
printf("st_rdev major:%d, minor:%d\n", e, f);
return 0;
}
#./lstat
st_dev MAJOR:0, MINOR:5
st_rdev MAJOR:0, MINOR:2080
st_dev major:0, minor:5
st_rdev major:8, minor:32
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