perl function getprotobyname

The getprotobyname function in Perl is used to retrieve protocol information by name.

Here's an example of using getprotobyname in Perl:

#!/usr/bin/perl

use strict;
use warnings;

# Get protocol information for "tcp"
my $proto_info = getprotobyname("tcp");

# Print the protocol number
print "Protocol number for tcp: $proto_info\n";

In this example, we call the getprotobyname function to retrieve protocol information for the "tcp" protocol. The function returns a structure containing protocol information, including the protocol number. We then print the protocol number to the console using the print function.

When you run this script, it will print the protocol number for "tcp" to the console.

Note that the behavior of getprotobyname may depend on the operating system and the specific protocol being queried. Additionally, the function may return undef if the specified protocol name is not recognized by the system.