System Call in Unix?

Hi,
Is there a way to send a system call from LabView 6.1 to UNIX similar to
the Windows environment?
Thanks,
Roger

I found it. Please ignore my last post. Thanks.
Regards,
Roger
"Roger C." wrote in message
news:ak699o$4en$[email protected]..
> Hi,
>
> Is there a way to send a system call from LabView 6.1 to UNIX similar
to
> the Windows environment?
>
> Thanks,
> Roger
>
>

Similar Messages

Make system call to unix api

I know java has a lot of things built in, but not everything is...
Is it possible to call a unix function using a simple example of (this functionality is availbe in java not my point):
#include <unistd.h>
access(const char *path, int amode);
How would one go about using this in a java application? Talking to the underlaying os?

I've used Jtux when I needed access to other Unix API's. It has a very poor installation system but otherwise works pretty well.

Unix system() system call in Java

Hi,
system() call in Unix is very helpfull when you need to implement a piece of code that is already implemented in an exsiting utility.
Is there a way to achive a similar functionality?
To put it in simpler words - is there a way, in Java, to call some method that will invoke a Unix shell and will execute the command specified in the string that is past in?
Could you please CC the reply to [email protected]
Thanks,
-Michael

Runtime.exec()
> Could you please CC the reply to [email protected]
Certainly not.

Unix System Calls using Java

Hi!
Can anyone tell me how to do Unix System Calls in my Java program?
If possible please give me the java code for it taking one unix system call as an example.
Thanks in advance
Raj

do you mean firing off a shell command, or making actual kernel API calls or C library calls?
for shell commands, have a look at Runtime.exec(). for kernel calls, use JNI. the JNI FAQ mentions something called "shared stubs" that may be of use:
http://java.sun.com/products/jdk/faq/jnifaq.html
cheers,
p

How do i make UNIX system calls in Java app?

Is it possible to make UNIX system calls in a java app? I.E. perform a file copy/move to another machine within a program.
Thanks,
Erik

If there is a command line tool then you use Runtime.exec() otherwise you have to use JNI.
If you want to access shared libraries you might want to look at www.swig.org

Call a unix command

Hi Community,
It's possible to create a program that a call does a unix command.
I would like created a synchronous scenario.
Then the program call a unix command and this is waiting up to when a unix command termined a runtime.
The command returned a data and the ABAP program will owe to take back the esecution.
I hope in you
Thank's everybody.

Hi Antonello,
i'd do it with different job steps (SM36)
1) Program1, which does a unix command:
syntax:
CALL 'SYSTEM' ID 'COMMAND' FIELD COMMAND
ID 'TAB' FIELD TABL-SYS.´
or have a look here: external commands
2) Program2 handle the output (e.g. a file) of program 1
regards Andreas

System calls in Java

Any suggestions how one would perform a UNIX call inside a C++ or Java program?
Student who needs help.

If it is really a system call, then you will have to define and implement a "native" method.
o java method witha "native modifier".
o write a small c program that implements the method
If you define the native method, and then run java.h, the result is a header file for the c program.

How to intercept system calls in JVM?

Hi, everyone. I am looking for a way to intercept system calls in JVM, a way do something like ptrace does in Linux. Because I wanna log all function calls a specified application made, and I may modify the arguments and the return value.
And then i search the internet but nothing found except this article:
[ http://java.sun.com/developer/technicalArticles/Programming/jvmti/#Authors| http://java.sun.com/developer/technicalArticles/Programming/jvmti/#Authors]
It's seems that JVMTI is a perfect tools to manipulate Java VM and i can achieve my goal with it. I download the sample code you written and modify a bit to adopt my environment (I use Linux and Sun JDK 6). It works well.
And then I add a function to get stacktrace like the case in your article. I also read the sample code in JVMIT Refenerce, but it doesn't work.
So, I am puzzled. I wanna know is there any way to intercept system calls in JVM? If JVMTI can do it, is there any tutorial or sample code to review? And, is that possible to use this way in J2ME?
Thanks a lot :)
Best Regard.

jschell wrote:
Nelly_Zeltser wrote:
I do not know if there are any tools similar to solaris truss is available to trace system and library calls in j2me world.Well, I want to trace the jvm system calls to OS (UNIX), not java.Are you using j2me?No, to say more I'm not "using" java at all. My program (written on C) just monitors all system calls from another program that I define as the parameter.
It may not be java. It may be any program:for example my simple .o file made by myself.
Can we continue this topic at [http://forums.sun.com/thread.jspa?messageID=10746765&#10746765|http://forums.sun.com/thread.jspa?messageID=10746765&#10746765]
I've written my shared library and defined LD_PRELOAD. But it doesn't help, cuz JVM, afaik, uses LD_PRELOAD for its own purposes, so
I can't use my shared library.That of course is not what the poster of this thread wanted to do.

Work Process tries to restart but fails - Operating system call fork:restar

Hi
We have a ECC 5.0 system running on v5r4 (6.40 kernel level 159). Some of the work processes fail and then try to restart and fail again. Thus there are many job log entries in both SAP and OS/400.
The OS/400 logs mention the PASE (unix executable environment) and MCH3203.
SAP mentions Operating system call fork:restart
OSS has note #884359 which mentions a palitative but despite being at 6.40 level 159 the parameter profile as/4/wp_max_restart is said to be "unknown" by RZ10.
We are making sure we are up to date with the APAR II14126 just in case this is the issue.
It did start after the time change but we are not sure this is the root cause.
We are also considering getting upto kernel 171.
Anyone else seen this issue?
thanks
Matthew Milne

We see those problems once a while, and usually they are gone when you restart the instance or after an IPL. You should report the problem to IBM, they will probably be interested in the LIC log entries that come along with the error (STRSST - Start a Service Tool - Licensed Internal Code Log). II14126 is probably a good start (for example, MF40759).
The profile parameter as4/wp_max_restart is only known to the kernel, because it is not intended as a permament setting, but only as a temporary workaround for the problem in the PASE environment. That's why RZ11 does not know about the parameter and reports it as unknown.
Kind regards,
Christian Bartels.

"The data area passed to a system call is too small" NFS client Windows 2008 R2 SP1

Hi
I need to map a Hyper-V virtual windows server to a UNIX folder, but when i made de mapping and tried to navigate in to the mapped unit and shows me:
"The data area passed to a system call is too small"
I tried too many things like adding a registry key (and windows 2008 r2 already has)
Use a similar account between Unix and Windows domain
I done the steps in the document:
http://technet.microsoft.com/en-us/library/cc753302(WS.10).aspx
And nothing, this is just frustrating, also I disabled the firewall in the virtual machine and the host server.
I have a Windows 2008 Domain R2 functionality and the virtual machine is Windows 2008 R2 too.
The version of unix are:
AIX6.1 x64
AIX 6.3 x64
AIX 5.1 x86
Any Idea?
Thanks!
Doc MX

Hi,
You may perform the following troubleshooting suggestions:
l
Change how your NFS servers export the NFS shares and make them allow connections from high ports.
l
Add UseReservedPorts DWORD value under HKLM\Software\Microsoft\Client for NFS\CurrentVersion\Default and set it to 1. Restart the Client for NFS service to allow
the change to take effect.
For more information, please refer to the following Microsoft MSDN blog:
"Network Error 53", "The data area passed to a system call is too small" or "Unknown Error"
http://blogs.msdn.com/b/sfu/archive/2011/07/14/3087987.aspx
Regards,
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

How to access system calls from java program?

i am having a doubt regarding accessing system calls from a Java program like accessing unix system calls from a c program.

Runtime.getRuntime().exec("line command here");
example:
Runtime.getRuntime().exec("ls -la");

Error during installation of ECC6- system call failed

Dear all,
i encounter the error as below during sap installation. its looks like the ID issue, but this id (fbqadm) is using by me to log into the windows. please help me.
thank
ERROR      2009-03-17 10:07:25.583 [syxxsyshlp.cpp:78]
           syslib::printOSError(const iastring &, int, DWORD, const iastring &, CMessage::eLogMessage)
FSL-00001 System call failed. Error 1326 (Logon failure: unknown user name or bad password.
) in execution of system call 'LogonUser' with parameter (fbqadm, SAPFBWDEV01, *******, LOGON32_LOGON_INTERACTIVE,LOGON32_PROVIDER_DEFAULT,&hUserToken), line (1014) in file (synxccuren.cpp).
TRACE      2009-03-17 10:07:25.813 [iaxxejsbas.hpp:408]
           handleException<ESyException>()
Converting exception into JS Exception ESyException.
TRACE      2009-03-17 10:07:25.813
Function setMessageIdOfExceptionMessage: modlib.jslib.caughtException

problem fix after reboot the server

Error on WAS no. 10054 SAP Basis System: Operating system call

Hi All,
Error on WAS no. 10054 SAP Basis System: Operating system call
we got the following error message in the syslog of the WAS:
SAP Basis System: Operating system call recv failed (error no. 10054)
The system still works. What can we do?
Thanks.
Best Regards,

Hi,
Please check the folloiwng notes
Error no. 10054
34116 - Syslog: "Operating System call xxxx failed"
Thanks
Adil

Correct Forum? CGI and Server behaviour on Solaris at system()-call

Hi to you all,
Do not know if i am in the correct forum, but maybe it is a Webserver problem.
I have Sun ONE Webserver 6.1 running on Solaris.
Craete some CGI`s in C.
Now I have a problem with one CGI, which have to call a Shellscript via system() call.
The Client just calls the CGI with some parameters, which will write the informations in a file with some additional informations from a database, after that, the script should be startet and do some printjobs in the background.
The CGI and the Shell-script is working fine. My Problem is, that the system() call always waits, until the ShellScript has finished, so the Webserver send the "data successful written" site after a couple of minutes, it should send it immeditatly to the client, so the session is closed.
I have tried to put the shellscript in background with "&", also with nohup and a second shell script which justs starts the first script, also with all combinations of nohup and "&" for background process.
also i tried with "pclose(popen(SCRIPT,"W");" to call the script, it is always the same, the session will close only, when the script has been finished.
In an other Forum I found an entry, that , however, IPlanet webserver always will do this in this way. The session will be closed, when all called processes has benn fisnished.
Any Ideas to solve my problem?

The web server reads from the CGI program's stdout. It knows the HTTP response is complete when the CGI program closes its stdout.
When you call system(), the child process inherits the CGI program's stdout and keeps it open until it finishes. If you want the child process to run asynchronously from the HTTP response, you should give the child process a new stdout with > /dev/null. (You'll still need to place the child process in the background with &.) Alternatively, you can fork(), close(1), then exec().

Tracing what is happening in the connect() system call

I've been playing around with some of the recipies in dtrace today trying to find out why it takes so long to connect from a linux machine to an ultra 5 running sendmail but I'm not having a lot of luck.
The one thing I can find is that the amount of time for the connect system call to return takes a long time. Here's the dtrace script I wrote (borrowing from Bryan Cantrill's blog):
bash-2.05b# cat functiontime.d
#!/usr/sbin/dtrace -s
#pragma D option flowindent
syscall::connect:entry
/execname == "sendmail"/
self->start = vtimestamp;
syscall:::entry,
syscall:::return
/self->start/
trace(vtimestamp - self->start);
syscall::connect:return
/execname == "sendmail"/
self->start = 0;
exit(0);
This is the output:
bash-2.05b# ./functiontime.d
dtrace: script './functiontime.d' matched 454 probes
CPU FUNCTION
0 => connect 0
0 | connect:return 303079
0 <= connect
I know there are other syscalls going on from the time connect enters to the time it returns but I have no idea how to get them to print.
Any ideas how I can make this script more useful to see exactly where sendmail is getting hung up?

You might also try something like
#!/usr/sbin/dtrace -s
#pragma D option flowindent
syscall::connect:entry
/execname == "sendmail"/
        self->depth = 1;
        self->syscallstart = timestamp
fbt:::entry
/self->depth/
        self->start[self->depth] = timestamp;
        trace(self->start[self->depth++] - self->syscallstart);
fbt:::return
/self->depth/
        this->delta = timestamp - self->start[--self->depth];
        @func[probefunc] = quantize(this->delta);
        printf("delta is %d\n", this->delta);
        self->start[self->depth] = 0;
syscall::connect:return
/self->depth/
        exit(0);
}This will give you the function call flow inside the kernel along with the following:
- on function entry, a time delta since connect was called
- on function exit, how long we spent in the function
- on return from the connect system call, a list of histograms showing the call times for all functions called
You are probably going to want to redirect the output as it gets big.
Also note, I've written this to give the information only for the first call to connect.
Alan.
Alan Hargreaves - http://blogs.sun.com/tpenta
Senior Technical Support Specialist/VOSJEC Engineer
Product Technical Support (APAC)
Sun Microsystems

System Call in Unix?

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