有没有一种在Linux下使用C++确定USB驱动器的序列号的方法?
如果不是用C++,是否有与 hwinfo -disk
和 hdparm -i
不同的其他方法?
> yum install sdparm
> sdparm --quiet --page=sn /dev/sda
Unit serial number VPD page:
3BT1ZQGR000081240XP7
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <scsi/scsi.h>
#include <scsi/sg.h>
#include <sys/ioctl.h>
int scsi_get_serial(int fd, void *buf, size_t buf_len) {
// we shall retrieve page 0x80 as per http://en.wikipedia.org/wiki/SCSI_Inquiry_Command
unsigned char inq_cmd[] = {INQUIRY, 1, 0x80, 0, buf_len, 0};
unsigned char sense[32];
struct sg_io_hdr io_hdr;
int result;
memset(&io_hdr, 0, sizeof (io_hdr));
io_hdr.interface_id = 'S';
io_hdr.cmdp = inq_cmd;
io_hdr.cmd_len = sizeof (inq_cmd);
io_hdr.dxferp = buf;
io_hdr.dxfer_len = buf_len;
io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
io_hdr.sbp = sense;
io_hdr.mx_sb_len = sizeof (sense);
io_hdr.timeout = 5000;
result = ioctl(fd, SG_IO, &io_hdr);
if (result < 0)
return result;
if ((io_hdr.info & SG_INFO_OK_MASK) != SG_INFO_OK)
return 1;
return 0;
}
int main(int argc, char** argv) {
char *dev = "/dev/sda";
char scsi_serial[255];
int rc;
int fd;
fd = open(dev, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
perror(dev);
}
memset(scsi_serial, 0, sizeof (scsi_serial));
rc = scsi_get_serial(fd, scsi_serial, 255);
// scsi_serial[3] is the length of the serial number
// scsi_serial[4] is serial number (raw, NOT null terminated)
if (rc < 0) {
printf("FAIL, rc=%d, errno=%d\n", rc, errno);
} else
if (rc == 1) {
printf("FAIL, rc=%d, drive doesn't report serial number\n", rc);
} else {
if (!scsi_serial[3]) {
printf("Failed to retrieve serial for %s\n", dev);
return -1;
}
printf("Serial Number: %.*s\n", (size_t) scsi_serial[3], (char *) & scsi_serial[4]);
}
close(fd);
return (EXIT_SUCCESS);
}
为了完整起见,我也会提供检索ATA设备(hda、hdb等)序列号的代码。这将无法用于USB设备。
#include <stdlib.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <linux/hdreg.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <cctype>
#include <unistd.h>
int main(){
struct hd_driveid *id;
char *dev = "/dev/hda";
int fd;
fd = open(dev, O_RDONLY|O_NONBLOCK);
if(fd < 0) {
perror("cannot open");
}
if (ioctl(fd, HDIO_GET_IDENTITY, id) < 0) {
close(fd);
perror("ioctl error");
} else {
// if we want to retrieve only for removable drives use this branching
if ((id->config & (1 << 7)) || (id->command_set_1 & 4)) {
close(fd);
printf("Serial Number: %s\n", id->serial_no);
} else {
perror("support not removable");
}
close(fd);
}
}
这段代码将获取USB序列号...它不像clyfe的那样技术上令人印象深刻,但每次都能解决问题。
#include <unistd.h>
#include <string.h>
#include <stdio.h>
int main(int arg, char **argv) {
ssize_t len;
char buf[256], *p;
char buf2[256];
int i;
len = readlink("/sys/block/sdb", buf, 256);
buf[len] = 0;
// printf("%s\n", buf);
sprintf(buf2, "%s/%s", "/sys/block/", buf);
for (i=0; i<6; i++) {
p = strrchr(buf2, '/');
*p = 0;
}
// printf("%s\n", buf2);
strcat(buf2, "/serial");
// printf("opening %s\n", buf2);
int f = open(buf2, 0);
len = read(f, buf, 256);
if (len <= 0) {
perror("read()");
}
buf[len] = 0;
printf("serial: %s\n", buf);
}
最好的方法可能是像命令行工具一样(很可能):从C++代码中检查/proc
或/sys
中的相关文件。
if ((io_hdr.info & SG_INFO_OK_MASK) != SG_INFO_OK) return -1
- Geoffrey