Provided by: systemtap-doc_2.3-1ubuntu1.4_all 

NAME
probe::udp.sendmsg - Fires whenever a process sends a UDP message
SYNOPSIS
udp.sendmsg
VALUES
name
The name of this probe
family
IP address family
daddr
A string representing the destination IP address
sock
Network socket used by the process
sport
UDP source port
size
Number of bytes sent by the process
dport
UDP destination port
saddr
A string representing the source IP address
CONTEXT
The process which sent a UDP message
SystemTap Tapset Reference March 2016 PROBE::UDP.SENDMSG(3stap)