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From: Bruce Evans <bde@FreeBSD.ORG>
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Date: Sat, 6 Dec 1997 03:28:09 -0800 (PST)
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To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG, cvs-sys@FreeBSD.ORG
Subject: cvs commit: src/sys/sys errno.h
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bde         1997/12/06 03:28:09 PST

  Modified files:
    sys/sys              errno.h 
  Log:
  Added a kernel-only error code ENOICTL.  This will be returned from
  low level ioctl routines instead of the magic number -1 so that
  callers can distinguish it from ERESTART (which happens to be -1).
  -1 meant that the ioctl was not handled at the called level.
  ERESTART is normal when a sleeping ioctl is interrupted.  ERESTART
  got converted to ENOTTY instead of restarting the ioctl.  Many
  (most?) ioctls can not be restarted safely, but this is apparently
  supposed to be handled by drivers converting ERESTART to EINTR.
  I first saw this problem for TIOCDRAIN.  Justin saw if for disk
  ioctls.
  
  Added missing parentheses.
  
  Revision  Changes    Path
  1.8       +4 -3      src/sys/sys/errno.h