Portname.

[mailtogsureshkumar]

Hi..Im a Beginner in linux....Im using SUSE....

For my java Program.i give the input port name in windows..as COM1

But Linux does not Support..
In linux displayLike /dev/ttsy0,ttsy1..I give "/dev/ttsy0" its not working...

How to give the portname in linux.

Give the solution...

Thanks in advance

Sorry for my Bad English

[Tsarevich]

Try:

ls /dev

to find the list of available device nodes. Choose one you find most suitable.

[oz]

For my java Program.i give the input port name in windows..as COM1

But Linux does not Support..
In linux displayLike /dev/ttsy0,ttsy1..I give "/dev/ttsy0" its not working...

Welcome to the forums!

Sorry, but it's against the Forum Rules to post duplicate threads so all of yours have been deleted.

Please feel free to continue any discussion in this thread.

Thanks!

[D-cat]

actually, "COM1" is /dev/ttyS0 in Linux land, that's TTY (lower case) for text terminal, S (upper case) for serial port, and 0 (zero) to say first port.

The thing with Linux is permissions. In many distros, including SuSE, users do not have access to the physical ports by default, they must be given permission to access them. This is just as easy as seeing what group the port devices belong to and adding the user to that group, e.g. in SuSE, to access the serial ports, a user must be a member of the group uucp.

dcat@Server:/dev> ls -l ttyS*
crw-rw---- 1 root uucp 4, 64 2009-05-19 18:10 ttyS0
crw-rw---- 1 root uucp 4, 65 2009-04-14 06:16 ttyS1
crw-rw---- 1 root uucp 4, 66 2009-04-14 06:16 ttyS2
crw-rw---- 1 root uucp 4, 67 2009-04-14 06:16 ttyS3
crw-rw---- 1 root uucp 4, 68 2009-04-14 06:16 ttyS4
crw-rw---- 1 root uucp 4, 69 2009-04-14 06:16 ttyS5
crw-rw---- 1 root uucp 4, 70 2009-04-14 06:16 ttyS6
crw-rw---- 1 root uucp 4, 71 2009-04-14 06:16 ttyS7
dcat@Server:/dev>

[mailtogsureshkumar]

Hi Thanks for ur Reply..its useful to me....

[mailtogsureshkumar]

Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException:
Error opening "/dev/ttyS1"
tcgetattr(): Input/output error

---
when i run a java code for port demo..the above following error arrised..what i do...

I give the permission to the ports, UUCP group also but its not working....

Reply.......

[gogalthorp]

Do you have 2 serial ports? /dev/ttyS1 is the second port the first port would be /dev/ttyS0. In Windows the first port is com1.

[mailtogsureshkumar]

Thanks....gogalthorp
For ur Reply....

In windows java coding run successfully.. portname COM1,COM2

Now i try that in Linux (SUSE)...

change the Portname as ttyS0,ttyS1...both the ports .....(/dev/ttyS0,/dev/ttyS1)
I put the related JARs,i give the permission but also....

can't open.....the above error arrives....What i do?......

some times this error also arrise

///////////////
Exception in thread "AWT-EventQueue-0" java.io.IOException: Not all params are supported by kernel
///////////
thanks in advance

[mailtogsureshkumar]

Hi Friends...........
-----------------
java.lang.OutOfMemoryError: Java heap space
java.io.ByteArrayOutputStream.<init>(ByteArrayOutp utStream.java:59)
org.apache.commons.fileupload.DeferredFileOutputSt ream.<init>(DeferredFileOutputStream.java:131)
org.apache.commons.fileupload.DefaultFileItem.getO utputStream(DefaultFileItem.java:55
org.apache.commons.fileupload.FileUploadBase.parse Request(FileUploadBase.java:406)
org.apache.struts.upload.CommonsMultipartRequestHa ndler.handleRequest(CommonsMultipartRequestHandler .java:233)
org.apache.struts.util.RequestUtils.populate(Reque stUtils.java:1209)
org.apache.struts.action.RequestProcessor.processP opulate(RequestProcessor.java:821)
org.apache.struts.action.RequestProcessor.process( RequestProcessor.java:254)
org.apache.struts.action.ActionServlet.process(Act ionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(Acti onServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet .java:709)
javax.servlet.http.HttpServlet.service(HttpServlet .java:802)
-----------------
1. im using both Linux Open SUSE, Windows
2. How to increase Heap size or Solution for above error

[gogalthorp]

You should always Google first

Setting Heap Sizes

note that it may be you have a programming error that is causing the memory exhaustion. 1) too many threads started but not ended 2) a recursing function that is not terminating in a reasonable amount of cycles.