C program to get pid of process

[grx0736 at uoft02.utoledo.edu]

this follows my earlier mail regarding pid of
running processes. I have  tried writing a small
program which looks somthing like :


main(argc, argv)
int argc;
char **argv;
{
	kvm_t *kd;
	struct proc *myproc;
	struct user *u;
	char ***arg;
	char ***env;
	int cmd_return;
	int mypid;

	scanf("%d", &mypid);
        kd = kvm_open(NULL, NULL, NULL, O_RDONLY, argv[0]);
        while(1) {
                myproc = kvm_nextproc(kd);
                if(myproc->p_pid == mypid)
                        printf("your process found\n");
                u = kvm_getu(kd, myproc);
                cmd_return = kvm_getcmd(kd, myproc, u, arg, env);
        }
}

	the program gets the proc structures corresponding
to all the processes,  but when i call kvm_getcmd, nothing
is being assigned to   arg  .

	Sun manuals say that after the call arg will point
to the command infomation of the process corresponding to 
myproc.  however, when i run this program, arg and env always
point to nil.  but  the call to kvm_getcmd returns 0 (zero)
indicating that the call was successful.

	any help in the above matter would be highly appreciated.

sunil kulkarni