Ping in NetRexx
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I've been trying to get a 'ping' to work in netrexx. Found this on the www
class PingIt method rt = Runtime.getRuntime(); -- ps = rt.exec("ping <127.0.0.1>"); I get this: === class PingIt === [C:\NetRexx_Java\Doodles\PingIt.nrx 7 8 2] Error: Exception 'java.io.IOException' is raised while initializing properties, but cannot be caught Compilation of 'PingIt.nrx' failed [one error] Does anyone have a short pinger in NetRexx?? thanks for the time and enjoy the day BOBH _______________________________________________ Ibm-netrexx mailing list [hidden email] |
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Bob,
why don't you try: class PingIt method PingIt() signals IOException child = Runtime.getRuntime().exec("ping 127.0.0.1"); in = BufferedReader(InputStreamReader(child.getInputStream())) line = '' loop while line \= null say line line = in.readline() end child.waitFor() method main(args=String[]) static PingIt() best regards, René. On 23 nov 2010, at 22:39, Robert Hamilton wrote: > I've been trying to get a 'ping' to work in netrexx. Found this on the www > > class PingIt > method > rt = Runtime.getRuntime(); > -- > ps = rt.exec("ping <127.0.0.1>"); > > I get this: > > === class PingIt === > [C:\NetRexx_Java\Doodles\PingIt.nrx 7 8 2] Error: Exception 'java.io.IOException' is raised while initializing properties, but cannot be caught > Compilation of 'PingIt.nrx' failed [one error] > > Does anyone have a short pinger in NetRexx?? > > thanks for the time and enjoy the day > > BOBH > _______________________________________________ > Ibm-netrexx mailing list > [hidden email] > _______________________________________________ Ibm-netrexx mailing list [hidden email] |
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Or you could try doing it the NetRexx/Java way (A simple case, I leave the implementation details to you):
/* NetRexx */ options replace format comments java crossref savelog symbols noutf8 /** * Ping.nrx * * @author Alan Sampson * @version 0.1 */ Do in = InetAddress host = 'google.com' timeout = 100; -- milliseconds in = InetAddress.getByName(host) ping = boolean loop for 5 ping = in.isReachable(timeout) if ping then Say 'Ping to' in.toString 'successful' else Say 'Ping to' in.toString 'failed' end Catch uhx = UnknownHostException uhx.printStackTrace Catch iox = IOException iox.printStackTrace End Alan. PS Caution; if you want to run successfully this under Mac OS X (and probably Linux too) you need superuser. It appears that Java on UNIX requires root privilege to use ICMP ping function calls. It may work on Windows. -- Can't tweet, won't tweet! _______________________________________________ Ibm-netrexx mailing list [hidden email]
Alan
-- Needs more cowbell. |
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In reply to this post by Robert L Hamilton
you might want to try SysCmd.exec in Rexx2Nrx.Rexx2RT This should work. Kind regards, Thomas. =================================================== Am 23.11.2010 22:39, schrieb Robert Hamilton: I've been trying to get a 'ping' to work in netrexx. Found this on the www _______________________________________________ Ibm-netrexx mailing list [hidden email]
Tom. (ths@db-123.com)
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In reply to this post by alansam
On 11/23/2010 8:37 PM, Alan Sampson wrote:
Or you could try doing it the NetRexx/Java way (A simple case, I leave the implementation details to you):This doesn't work for me: C:\cygwin\home\tmaynard\NetRexx\play>java ping1 Ping to google.com/74.125.95.106 failed Ping to google.com/74.125.95.106 failed Ping to google.com/74.125.95.106 failed Ping to google.com/74.125.95.106 failed Ping to google.com/74.125.95.106 failed C:\cygwin\home\tmaynard\NetRexx\play>ping google.com Pinging google.com [74.125.95.106] with 32 bytes of data: Reply from 74.125.95.106: bytes=32 time=23ms TTL=53 Reply from 74.125.95.106: bytes=32 time=22ms TTL=53 Reply from 74.125.95.106: bytes=32 time=22ms TTL=53 Reply from 74.125.95.106: bytes=32 time=21ms TTL=53 Ping statistics for 74.125.95.106: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 21ms, Maximum = 23ms, Average = 22ms C:\cygwin\home\tmaynard\NetRexx\play> Tom. _______________________________________________ Ibm-netrexx mailing list [hidden email] |
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I must admit I got surprised by this when I read your comment.
At the time I was very busy but lately I've had an assignment for a similar task and had to look further into this. Here is what the javadoc for InetAddress.isReachable() has to say: "A typical implementation will use ICMP ECHO REQUESTs if the privilege can be obtained" Well, I would say that typically, the typical canonical implementation wouldn't typically do what the typical specification says typical implementations would typically do. Hi Groucho, wherever you are :-) Yes the windows Oracle jvm does not use icmp echo requests but tcp echo (port 7) which is closed on any host I've ever put my eyes on. On the other hand the java API does not offer plain ICMP nor raw sockets with which you could implement it yourself. So that's it. While on win/Oracle jvm you either use Bob's approach or leverage some jni native library like the shortpasta one which I ended using. See http://www.shortpasta.org/ if still interested. 2010/11/24 Tom Maynard <[hidden email]>
-- Saludos / Regards, David Requena _______________________________________________ Ibm-netrexx mailing list [hidden email] |
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