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Full Discussion: Application behaving in 3 different ways on 3 different machines
Top Forums Programming Application behaving in 3 different ways on 3 different machines Post 302752541 by erupter on Monday 7th of January 2013 06:51:34 AM
Old 01-07-2013
[solved] Application behaving in 3 different ways on 3 different machines
Hello.
During the holidays I've been developing an application on my desktop computer at home.
I setup a repository on github, so when I got back to work I cloned the repo to my laptop.

It wouldn't work.
The app is comprised of a client and a server, strangely enough the server would segfault at a strcpy at the very beginning, while the client would bug me about not supplying a command line parameter (it's supposed to work anyway).

So I ssh-ed into an office machine we use to test things out, cloned the repo and the problems are inverted!
Now it's the client that would segfault while the server pretends a parameter!

My machines are
desktop - i7 2600k with Ubuntu 12.04 x64 eng
laptop - core2duo with Ubuntu 12.04 x64 eng
test pc - core2duo with Ubuntu 10.04 ita (dunno if x86 or x64)

Now I could bear that an app developed on a single pc would require some tinkering on other pcs, but the same app displaying exactly symmetrical behaviour on two different pcs I can't understand.

Anyway the specific code that seems to be the problems is the following
Code:
struct arguments
{
  int *Z_DEBUG, *M_DEBUG;
  char * interf;
  char * outfile;            /* Argument for -o */
};

int main(int argc, char** argv) {

    struct arguments arguments;
    outstream = stdout;
    arguments.M_DEBUG=&MAIN_DEBUG;
    arguments.Z_DEBUG=&ZMQ_DEBUG;
    strcpy( arguments.interf, "eth0" );
    arguments.outfile = NULL;
    s_catch_signals();

    argp_parse(&argp, argc, argv, 0, 0, &arguments);

either I get a segfault at the strcpy or somehow the argp_parse exits the program.

I'm not an expert enough to understand why declaring the following is correct
Code:
char *mystring="useless phrase";

while this is wrong
Code:
char *mystring;
strcpy(mystring, "useless phrase");

And even more so I can't understand why, if it's wrong, it would work on my desktop computer!

Any help is really appreciated.
Last edited by erupter; 01-07-2013 at 10:16 AM.. Reason: solved
 

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LEARN ABOUT DEBIAN

pvmfstartpvmd

START_PVMD(3PVM)						  PVM Version 3.4						  START_PVMD(3PVM)

NAME

       pvm_start_pvmd - Starts new PVM daemon.

SYNOPSIS

       C    int info = pvm_start_pvmd( int argc, char **argv, int block )

       Fortran	 call pvmfstartpvmd( args, block, info )

PARAMETERS

       argc    Number of arguments in argv.

       argv    An array of arguments to the executable.

       args    A character string containing the arguments to the executable.

       args    A character string containing the arguments to the executable.

       block   Integer specifying whether to block until startup of all hosts complete or return immediately.

       info    Integer returning the error code.

DESCRIPTION

       The  routine  pvm_start_pvmd starts up a pvmd3 process, the master of a new virtual machine.  It returns as soon as the pvmd is started and
       ready for work.	If the block parameter is nonzero and a hostfile is passed to the pvmd as a parameter, it returns when all hosts marked to
       start have been added.  pvm_start_pvmd returns zero on success.

       If  PVM is compiled to allow running more than one pvmd per host, a task calling pvm_start_pvmd before any other pvm functions will connect
       to the pvmd that it starts.  pvm_start_pvmd sets environment variable PVMSOCK to the address printed by the pvmd as it starts up.

EXAMPLES

       C:
	    static char *argv[] = {
		"-d41",
		"/u/jones/pvmd_hosts",
	    };
	    argc = 2
	    info = pvm_start_pvmd( argc, argv, block );

       Fortran:
	    CALL PVMFSTART_PVMD( '-d41 /u/jones/pvmd_hosts', BLOCK, INFO )

EXAMPLES

       C:
	    static char *argv[] = {
		"-d41",
		"/u/jones/pvmd_hosts",
	    };
	    argc = 2
	    info = pvm_start_pvmd( argc, argv, block );

       Fortran:
	    CALL PVMFSTART_PVMD( '-d41 /u/jones/pvmd_hosts', BLOCK, INFO )

ERRORS

       The following error conditions can be returned

       PvmDupHost
	      A pvmd is already running.

       PvmSysErr
	      The local pvmd is not responding.

SEE ALSO

       pvm_addhosts(3PVM), pvmd3(1PVM) pvmd3(1PVM)

								 11 December, 1995						  START_PVMD(3PVM)
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