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Differential D29551

Add afterbuild target to bsd.prog.mk.
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Authored by dgr_semihalf.com on Apr 2 2021, 2:09 PM.
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rG7c8d38112da7: Add afterbuild target to bsd.prog.mk.
Summary

Afterbuild target allows to perform operations on fully built binary.
This is needed to allow for ELF feature flags modification during
world build.

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mk/
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share/mk/bsd.prog.mk

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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE. .\" SUCH DAMAGE.
.\" .\"
.Dd January 25, 2012 .Dd June 23, 2024
.Dt LO 4 .Dt LO 4
.Os .Os
.Sh NAME .Sh NAME
.Nm lo .Nm lo
.Nd software loopback network interface .Nd software loopback network interface
.Sh SYNOPSIS .Sh SYNOPSIS
.Cd "device loop" .Cd "device loop"
.Sh DESCRIPTION .Sh DESCRIPTION
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The loopback interface should be the last interface configured, The loopback interface should be the last interface configured,
as protocols may use the order of configuration as an indication of priority. as protocols may use the order of configuration as an indication of priority.
The loopback should The loopback should
.Em never .Em never
be configured first unless no hardware be configured first unless no hardware
interfaces exist. interfaces exist.
.Pp .Pp
If the transmit checksum offload capability flag is enabled on a loopback If the transmit checksum offload capability flag is enabled on a loopback
interface, checksums will not be generated by IP, UDP, or TCP for packets interface, checksums will not be generated by IP, UDP, TCP, or SCTP for packets
sent on the interface. sent on the interface.
.Pp .Pp
If the receive checksum offload capability flag is enabled on a loopback If the receive checksum offload capability flag is enabled on a loopback
interface, checksums will not be validated by IP, UDP, or TCP for packets interface, checksums will not be validated by IP, UDP, TCP, or SCTP for packets
received on the interface. received on the interface.
.Pp .Pp
By default, both receive and transmit checksum flags will be enabled, in By default, both receive and transmit checksum flags will be enabled, in
order to avoid the overhead of checksumming for local communication where order to avoid the overhead of checksumming for local communication where
data corruption is unlikely. data corruption is unlikely.
If transmit checksum generation is disabled, then validation should also be If transmit checksum generation is disabled, then validation should also be
disabled in order to avoid packets being dropped due to invalid checksums. disabled in order to avoid packets being dropped due to invalid checksums.
.Sh DIAGNOSTICS .Sh DIAGNOSTICS
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