capacity.c

来自「对SCSI设备 直接存取的通用库」· C语言 代码 · 共 45 行

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <scsi/da.h>



char *prg;



int
main(int argc, char **argv)
{
    SCSI *fd;
    int i;
    unsigned long lba, bl;

    prg = argv[0];

    if (argc != 2) {
	fprintf(stderr, "usage: %s device\n", prg);
	exit(1);
    }

    if ((fd=sc_open(argv[1])) == NULL) {
	fprintf(stderr, "%s: can't open device %s: %s\n",
		prg, argv[1], strerror(errno));
	exit(1);
    }
    
    lba = 0;
    if (sc_da_read_capacity(fd, &lba, &bl, 0) < 0) {
	sc_fstatus(fd, stderr, prg, "read_capacity", 3);
	sc_close(fd);
	exit(1);
    }

    printf("%lu (%lu * %lu)\n", lba*bl, lba, bl);

    sc_close(fd);

    exit(0);
}