[Pcsclite-muscle] pcsclite on OS-X Yosemite drives me crazy

[pcsclite.pkoch at dfgh.net]

Dear readers,

One of may smartcard application running under Mac OS-X suddenly stopped
working. The application does a fork() unless started in debug-mode. It took
me quite a while until I found:

http://ludovicrousseau.blogspot.de/2015/01/os-x-yosemite-bug-pcsc-functions-crash.html

It's always fun to search for a bug that disappears if you switch on
debug-mode :-)

Here's what Ludivic writes in his blog:

"I verified this behaviour only with SCardListReaders() and SCardConnect().
I would not be surprised if it is the case for all PC/SC functions (except
SCardEstablishContext() of course)."

Maybe this will surpise you: Under OS-X Yosemite EVERY PC/SC-function will
crash in
a child process if SCardEstablishContext() was called in the parent process
INCLUDING SCardEstablishContext() itself.

If SCardEstablishContext() was not called in a parent process
SCardEstablishContext() will fail in a child process with "Service not
available"

So if you are running a daemon that forks child processes your cannot use
pcsclite anymore from these child processes no matter what you try.

Any ideas??

Kind reagrds

Peter Koch

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

#include <PCSC/pcsclite.h>
#include <PCSC/wintypes.h>
#include <PCSC/winscard.h>

int main(int argc, char *argv[]){
        SCARDCONTEXT hContext;
        LONG ret;
        int i=1;

        if(i){
                ret=SCardEstablishContext(SCARD_SCOPE_USER, 0, 0,
&hContext);
                printf("Parent: SCardEstablishCOntext() %s\n",
pcsc_stringify_error(ret));

                SCardReleaseContext(hContext);
                printf("released SCard-Context\n");
        }

        // Detach from controlling-terminal
        i=fork();
        printf("fork()=%d\n",i);
        if(i) exit(0);

        printf("Child\n");

        ret=SCardEstablishContext(SCARD_SCOPE_USER, 0, 0, &hContext);
        printf("Child: SCardEstablishCOntext() %s\n",
pcsc_stringify_error(ret));

        return 0;
}
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