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Perl getprotobynumber Function
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 produces the following result −
Name = tcp Aliases = TCP Protocol Number = 6
perl_function_references.htm
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