main: call unloadlibs from main

Signed-off-by: He Xian <hexian000@outlook.com>

event: fix crash

Signed-off-by: He Xian <hexian000@outlook.com>

doc: update readme

Signed-off-by: He Xian <hexian000@outlook.com>

build: remove nproc

Signed-off-by: He Xian <hexian000@outlook.com>

main: notify systemd if possible

Signed-off-by: He Xian <hexian000@outlook.com>

server: set backlog to SOMAXCONN

Signed-off-by: hexian000 <hexian000@outlook.com>

contrib: add better formats

Signed-off-by: hexian000 <hexian000@outlook.com>

all: code cleanup

Signed-off-by: hexian000 <hexian000@outlook.com>

util: fix derp

Signed-off-by: hexian000 <hexian000@outlook.com>

pkt: fix possible DoS attack by sending ICMP packet

Signed-off-by: hexian000 <hexian000@outlook.com>