Thread: problem with fork command after solaris to Linux porting

Hi All,

I am doing c++ application porting from Solaris/SPARK to Linux/x86. When i run my application on linux it crashes after a fork call.Actually parent process has exit call to make the child daemon process, but after fork call child gets SIGSEGV & terminates.

Can anyone help me to find out the actual cause. Thanks in advance.



following are the lines from strace output

Code:

clone(Process 23250 attached
child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb7f40928) = 23250
[pid 23250] time([1247829456])          = 1247829456
[pid 23250] open("/etc/localtime", O_RDONLY) = 3
[pid 23250] fstat64(3, {st_mode=S_IFREG|0644, st_size=109, ...}) = 0
[pid 23250] fstat64(3, {st_mode=S_IFREG|0644, st_size=109, ...}) = 0
[pid 23250] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f61000
[pid 23250] read(3, "TZif\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\4\0\0\0\4\0"..., 4096) = 109
[pid 23250] close(3)                    = 0
[pid 23250] munmap(0xb7f61000, 4096)    = 0
[pid 23250] --- SIGSEGV (Segmentation fault) @ 0 (0) ---
Process 23250 detached

- Amit

What might help you out is ensuring that core files are enabled on the system. Run "ulimit -c unlimited", then run the program again so that it crashes. It should leave you with a core file that you can load with GDB. That can tell you some more information on what caused the crash.

For this to be helpful, you will need to make sure the application is built with debugging symbols (The -g option passed to GCC).

Thanks for your suggestions.Core file points to a different location for the failure.

The application is crashing at insert() function of a map. The map variable is the static member variable of a class. But when i write the sample pgm with the same scenario it works fine.
I use following flags while compiling application.
CFLAGS_STATIC_LINKING = -Wall
LD_FLAGS_STATIC_LINKING = -O3 -nostdlib

Please give your suggestions.

Code:

File TMap.h
============================================
#include<map>

using namespace std;

 class TMap
 {
public:
typedef map<string, string> TestMap;
static void func();
private:
        static TestMap m_TestMap;
 };
=============================================
File TMap.cpp
=============================================
#include<iostream>
#include"TMap.h"

using namespace std;

//typedef map<string, string> TestMap;
TMap::TestMap TMap::m_TestMap;

int main()
{
        TMap::func();
        return 0;
}

void TMap::func()
{
        cout << "Start ::" <<endl;
        m_TestMap.insert(TMap::TestMap::value_type("HI","Hello"));
        cout << "End :: %u" << &m_TestMap <<endl;
}

I am porting a Solaris application to Linux, so makefile has the same syntax as of solaris.

I got the solution.Thanks alot for your help guys...

removal of -nostdlib did the work