[Buildroot] [Bug 645] New: allow to build nbd-server with NBD package

[bugzilla at busybox.net <bugzilla@busybox.net>]

https://bugs.busybox.net/show_bug.cgi?id=645

           Summary: allow to build nbd-server with NBD package
           Product: buildroot
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P3
         Component: Other
        AssignedTo: unassigned at buildroot.uclibc.org
        ReportedBy: vincent.palatin_buildroot at m4x.org
                CC: buildroot at uclibc.org
   Estimated Hours: 0.0


Created an attachment (id=681)
 --> (https://bugs.busybox.net/attachment.cgi?id=681)
nbd-server binary build

At the moment, the NBD package can only build the "nbd-client" binary.
The attached patch adds the ability to build "nbd-server" binary (ie the
userspace daemon used to serve block to a remote client)
it can activate client, server or both.

It includes 2 patches for nbd-server source code :
- remove SUSv3 deprecated function "index()"
- fix read function usage when -EAGAIN occurs (same fix as in nbd-server debian
package)

I have tested this on an ARM target.


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