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Full Discussion: C++ Segmentation Fault on exit of main
Top Forums Programming C++ Segmentation Fault on exit of main Post 302181803 by SonOfPerdition on Friday 4th of April 2008 07:15:04 AM
Old 04-04-2008
C++ Segmentation Fault on exit of main
Hi,

I have 2 problems with a simple C++ app which i feel may be related.

1/ my app throws a Segmentaion Fault when my code exists from main(). I have stripped it to it's simplest form with no code in main and it still generates a segmentation fault.
I'm not sure what is causing this, possibly i'm missing a compiler switch in my build?

see code sample below.

2/ if i debug my test code in dbx i notice that argc is set to 0 and argv is nil. on further testing i find argc and argv are always 0 no matter what command line arguments i pass to the app (tested with a modifed veriosn that prints the output of argc and argv)

Has anyone got any ideas what could be causing these problems? I tried the same code on a solaris10 box and got the same result so i'm assuming it's something i'm doing wrong with my compile and link settings.


would appreciate any input ..
ta,
SOP


First off .. my enviornment.

OS: SunOS devsun02 5.8 Generic_108528-29 sun4u sparc SUNW,Ultra-4
64-bit sparcv9 kernel modules
I also verified i get the same reults when i try my code on a Solaris10 box

C++ compiler: CC: Sun WorkShop 6 update 1 C++ 5.2 2000/09/11

Problem: When my program exists main it throws a Segmentaion Fault.

my code is as follows

Testharness.cpp:
#include <iostream>

int main(int argc, char* argv[])
{
std::cout << "argc="<<argc<<" argv="<<argv<<std::endl;
return 0;
}


my copile and link:

CC -xarch=v9 -c -o src/TestHarness.o src/TestHarness.cpp
OS version : 5.8
Library Path : -L/opt/SUNWspro/lib/v9 -L/usr/lib/sparcv9 -L/opt/sunstudio9/SUNWspro/lib/v9 -L/usr/ucblib/sparcv9/
ld -o Testharness src/TestHarness.o -64 -L/opt/SUNWspro/lib/v9 -L/usr/lib/sparcv9 -L/opt/sunstudio9/SUNWspro/lib/v9 -L/usr/ucblib/sparcv9/ -lCrun -lCstd -lc



when I run:

>./Testharness
argc=0 argv=0
Segmentation Fault



the libraries Testharness is linking to:

ldd Testharness
libCrun.so.1 => /usr/lib/64/libCrun.so.1
libCstd.so.1 => /usr/lib/64/libCstd.so.1
libc.so.1 => /usr/lib/64/libc.so.1
libucb.so.1 => /usr/ucblib/sparcv9//libucb.so.1
libresolv.so.2 => /usr/lib/64/libresolv.so.2
libsocket.so.1 => /usr/lib/64/libsocket.so.1
libnsl.so.1 => /usr/lib/64/libnsl.so.1
libelf.so.1 => /usr/lib/64/libelf.so.1
libdl.so.1 => /usr/lib/64/libdl.so.1
libmp.so.2 => /usr/lib/64/libmp.so.2
/usr/platform/SUNW,Ultra-4/lib/sparcv9/libc_psr.so.1


I set dbx to check access and memuse and i get no further information.

output from dbx
(process id 13308)
argc=0 argv=0
signal SEGV (no mapping at the fault address) in (unknown) at 0x8
0x0000000000000008: <bad address 0x8>



any help would be most appreciated. .
Last edited by SonOfPerdition; 04-04-2008 at 08:18 AM.. Reason: cleaned up code sample
 

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LEARN ABOUT CENTOS

tk_main

Tk_Main(3)						       Tk Library Procedures							Tk_Main(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tk_Main - main program for Tk-based applications

SYNOPSIS

       #include <tk.h>

       Tk_Main(argc, argv, appInitProc)

ARGUMENTS

       int argc (in)				  Number of elements in argv.

       char *argv[] (in)			  Array of strings containing command-line arguments.

       Tcl_AppInitProc *appInitProc (in)	  Address  of  an  application-specific  initialization procedure.  The value for this argument is
						  usually Tcl_AppInit.
_________________________________________________________________

DESCRIPTION

       Tk_Main acts as the main program for most Tk-based applications.  Starting with Tk 4.0 it is not called main anymore because it is part	of
       the Tk library and having a function main in a library (particularly a shared library) causes problems on many systems.	Having main in the
       Tk library would also make it hard to use Tk in C++ programs, since C++ programs must have special C++ main functions.

       Normally each application contains a small main function that does nothing but invoke Tk_Main.  Tk_Main then does all the work of  creating
       and running a wish-like application.

       When  it  is  has  finished  its own initialization, but before it processes commands, Tk_Main calls the procedure given by the appInitProc
       argument.  This procedure provides a "hook" for the application to perform its own initialization, such	as  defining  application-specific
       commands.  The procedure must have an interface that matches the type Tcl_AppInitProc:
	      typedef int Tcl_AppInitProc(Tcl_Interp *interp);
       AppInitProc is almost always a pointer to Tcl_AppInit; for more details on this procedure, see the documentation for Tcl_AppInit.

KEYWORDS

       application-specific initialization, command-line arguments, main program

Tk									4.0								Tk_Main(3)
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