Man

Command Section
sysdecode_socket_protocol(3)                  FreeBSD Library Functions Manual

NAME
     sysdecode_socket_protocol - lookup name of socket protocol

LIBRARY
     System Argument Decoding Library (libsysdecode, -lsysdecode)

SYNOPSIS
     #include <sys/types.h>
     #include <stdbool.h>
     #include <sysdecode.h>

     const char *
     sysdecode_socket_protocol(int domain, int protocol);

DESCRIPTION
     The sysdecode_socket_protocol() function returns a text description of
     the protocol passed in the protocol argument to socket(2).
     sysdecode_socket_protocol() takes the protocol as well as the domain to
     uniquely identify the protocol.

FreeBSD 11.1-RELEASE-p4          May 25, 2017          FreeBSD 11.1-RELEASE-p4
Command Section