Re: [PATCH v7] mremap.2: Add information for MREMAP_DONTUNMAP.

Yes, you're correct that is poorly worded. I'll send an updated
manpage closer to the release of this in case anything else changes.
Thanks for taking a look.

Brian

On Tue, Feb 25, 2020 at 5:51 AM Vlastimil Babka [off-list ref] wrote:

On 2/21/20 6:42 PM, Brian Geffon wrote:

quoted

@@ -209,10 +227,20 @@ flag was not specified.
 .RE
 .TP
 .B ENOMEM
+Not enough memory was available to complete the operation.
+Possible causes are:
+.RS
+.IP * 3
 The memory area cannot be expanded at the current virtual address, and the
 .B MREMAP_MAYMOVE
 flag is not set in \fIflags\fP.
 Or, there is not enough (virtual) memory available.
+.IP *
+.B MREMAP_DONTUNMAP
+was used without
+.B MREMAP_FIXED
+causing a new mapping to be created that would exceed the virtual memory available or it would exceed the maximum number of allowed mappings.

So this can also result with MREMAP_FIXED, no?

quoted

+.RE
 .SH CONFORMING TO
 This call is Linux-specific, and should not be used in programs
 intended to be portable.