DEVGUIDE.adoc

Development Guide

Table of Contents

• How to create a rpm?
• How to create a docker image?
• Linux Sock Err codes
• Socket Options

How to create a rpm?

1. Install the required software

yum install -y rpmdevtools rpmlint

2. Update 'release.spec'

Update the Version and Release as a larger version, update the Name if you want to change the rpm name.

Name:           ttcp
Version:        x.x
Release:        x

3. Run 'release.sh'

./release.sh

The above steps execute success will genertate ttcp-x.x-x.$ARCH.rpm under ~/rpmbuild/RPMS/$ARCH folder.

How to create a docker image?

1. Install the docker

# docker -v
Docker version 20.10.14, build a224086

2. Make sure rpm could build as expected, run 'build.sh'

./build.sh

The above steps execute success will build docker images cloudadc/ttcp:x.x-x.

Linux Sock Err codes

errno	description	note
32	Broken pipe	Sock stream be broken
98	Address already in use	bind() failed due to address already in use
99	Cannot assign requested address	bind() failed due to can not assign a port
104	Connection reset by peer	read or write IO err due to peer reset connection
110	Connection timed out	firewall drop packet
111	Connection refused	connect() failed due to incorrect port, or proxy/firewall rejection.
113	No route to host	connect() failed due to incorrect host

Socket Options

test/sock/checkops.c is a test fucntion to list all available socket options, the following are options set in linux:

O_BROADCAST: default = off
SO_DEBUG: default = off
SO_DONTROUTE: default = off
SO_ERROR: default = 0
SO_KEEPALIVE: default = off
SO_LINGER: default = l_onoff = 0, l_linger = 0
SO_OOBINLINE: default = off
SO_RCVBUF: default = 87380
SO_SNDBUF: default = 16384
SO_RCVLOWAT: default = 1
SO_SNDLOWAT: default = 1
SO_RCVTIMEO: default = 0 sec, 0 usec
SO_SNDTIMEO: default = 0 sec, 0 usec
SO_REUSEADDR: default = off
SO_REUSEPORT: default = off
SO_TYPE: default = 1
IP_TOS: default = 0
IP_TTL: default = 64
TCP_MAXSEG: default = 536
TCP_NODELAY: default = off