system-function call asynchron?

Question

At one place in a code i call an external tool with the system-Call. I work with Wine and program with C.

The call is like this:

system("blabla.exe outfile");

The command is dynamically generated to change the outfile. A few lines later i try to open the generated file with fopen, but fopen returns NULL.

If i change the call to the following everything works:

system("blabla.exe outfile");
Sleep(2000);

But i don't like to wait 2 seconds... And this solution is very bad. I think the system-Call works synchron? So the sub-process an all its (File-)Handles should be closed after the system-Call, not? I'm a bit confused about this.

Thanks

Answer 1

system call is synchronous, according to the man page it returns after the execution ends. I suspect there's something with wine flushing file handles.