[Bug 206876] ifconfig(8): Inconsistent behavior when creating and giving custom name to interface at the same time

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206876

            Bug ID: 206876
           Summary: ifconfig(8): Inconsistent behavior when creating and
                    giving custom name to interface at the same time
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: marieheleneka at gmail.com

# uname -a
FreeBSD venus 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r295136: Tue Feb  2 09:27:29
CET 2016     root at venus:/usr/obj/usr/src/sys/GENERIC  amd64

How to reproduce:
# ifconfig tap create name teststuff
tap0
ifconfig: ioctl SIOCSIFNAME (set name): Device not configured

Expected behaviour:
1: ifconfig(8) should know the name of the newly created interface (tap0) and
change its name according to the 'name' parameter (teststuff). 
2: It should echo the name provided in 'name' parameter (example: teststuff),
unless it failed to change the name, in which case it should echo the
automatically numbered name. (example: tap0)

It currently does expected behavior 2, but not expected behavior 1.

Workaround: (thanks to thoht on Freenode. Below syntax is for /bin/sh)
# ifconfig $( ifconfig tap create ) name teststuff

It works as expected when using the syntax:
# ifconfig tap0 create name teststuff

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