centos man page for scsi_test_unit_ready

SCSI_TEST_UNIT_READY(9) 					  SCSI mid layer					   SCSI_TEST_UNIT_READY(9)

NAME
       scsi_test_unit_ready - test if unit is ready

SYNOPSIS
       int scsi_test_unit_ready(struct scsi_device * sdev, int timeout, int retries, struct scsi_sense_hdr * sshdr_external);

ARGUMENTS
       sdev
	   scsi device to change the state of.

       timeout
	   command timeout

       retries
	   number of retries before failing

       sshdr_external
	   Optional pointer to struct scsi_sense_hdr for returning sense. Make sure that this is cleared before passing in.

DESCRIPTION
       Returns zero if unsuccessful or an error if TUR failed. For removable media, UNIT_ATTENTION sets ->changed flag.

AUTHORS
       James Bottomley <James.Bottomley@hansenpartnership.com>
	   Author.

       Rob Landley <rob@landley.net>
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   SCSI_TEST_UNIT_READY(9)