Perl getprotobynumber Function

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Description

This function translates the protocol NUMBER into its corresponding name in a scalar context, and its name and associated information in a list context:($name, $aliases, $protocol_number).

Syntax

Following is the simple syntax for this function:

getprotobynumber NUMBER

Return Value

This function returns undef on error otherwise protocol number in scalar context and empty list on error protocol record (name, aliases, protocol number) in list context.

Example

Following is the example code showing its basic usage:

#!/usr/bin/perl

($name, $aliases, $protocol_number) = getprotobynumber(6);

print "Name = $name\n";
print "Aliases = $aliases\n";
print "Protocol Number = $protocol_number\n";

When above code is executed, it produced following result

Name = tcp
Aliases = TCP
Protocol Number = 6


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