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userfaultfd.2: Describe errors for read() on userfaultfd 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2017-01-06 07:53:41 +13:00
parent 68a9e23c1f
commit 058b32ac70
1 changed files with 10 additions and 0 deletions
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10
man2/userfaultfd.2
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@ -199,6 +199,16 @@ otherwise it is a read fault.
.\" UFFD_PAGEFAULT_FLAG_WP is not yet supported.
.RE
.PP
A
.BR read (2)
on a userfaultfd file descriptor can fail with the following errors:
.TP
.B EINVAL
The userfaultfd object has not yet been enabled using the
.BR UFFDIO_API
.BR ioctl (2)
operation
.PP
The userfaultfd file descriptor can be monitored with
.BR poll (2),
.BR select (2),