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unsigned char cdb[6];

cdb[0] = 0xc5 ;//
cdb[1] = evpd & 1 ;//
cdb[0] = page_code & 0xff ;//
cdb[0] = 0 ;//
cdb[0] = 0xff ;//
cdb[0] = 0 ;//

p_hdr->dxfer_direction = SG_DXFER_from_DEV ;
p_hdr->cmdp =cdb ;
p_hdr->cmd_len = 6 ;

ioctl(dev,SG_IO,p_hdr);
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