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Document that write(2) et al can return EROFS for attempts to write the

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disk label area.

PR:		43891
Submitted by:	Diomidis D. Spinellis <dds@istlab.dmst.aueb.gr>
MFC after:	3 days
This commit is contained in:
Jens Schweikhardt 2002-10-10 19:16:10 +00:00
parent 63872bc9c5
commit b2aa8b2a98
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=104813
3 changed files with 15 additions and 2 deletions
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7
lib/libc/sys/write.2
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@ -171,6 +171,13 @@ A signal interrupted the write before it could be completed.
.It Bq Er EAGAIN
The file was marked for non-blocking I/O,
and no data could be written immediately.
.It Bq Er EROFS
An attempt was made to write over a disk label area at the beginning
of a slice.
Use
.Xr disklabel 8
.Fl W
to enable writing on the disk label area.
.El
.Pp
In addition,

5
sbin/bsdlabel/bsdlabel.8
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@ -314,7 +314,10 @@ useful to see how a partitioning scheme will work out for a specific disk.
.Ss Enabling and disabling writing to the disk label area
.Pp
By default, it is not possible to write to the disk label area at the beginning
of a disk. The disk driver silently ignores any attempt to do so. If you need
of a disk. The disk driver arranges for
.Xr write 2
and similar system calls
to return EROFS on any attempt to do so. If you need
to write to this area (for example, to obliterate the label), use the form
.Pp
.Nm

5
sbin/disklabel/disklabel.8
View File

@ -314,7 +314,10 @@ useful to see how a partitioning scheme will work out for a specific disk.
.Ss Enabling and disabling writing to the disk label area
.Pp
By default, it is not possible to write to the disk label area at the beginning
of a disk. The disk driver silently ignores any attempt to do so. If you need
of a disk. The disk driver arranges for
.Xr write 2
and similar system calls
to return EROFS on any attempt to do so. If you need
to write to this area (for example, to obliterate the label), use the form
.Pp
.Nm