[ ei-grad@ei-grad ~ ]
→ ./test_cpro 
First call succeed for 12791
Got error: 8009001d
Second call failed for 12793
Second call succeed for 12791

/*
gcc -Wall -g -DUNIX -DSIZEOF_VOID_P=8 -I/opt/cprocsp/include test_cpro.c -c -o test_cpro.o && \
gcc test_cpro.o -L/opt/cprocsp/lib/amd64 -lcapi10 -g -o test_cpro
*/

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

#include <cpcsp/WinCryptEx.h>


int acquire_crypto_context(void) {

    HCRYPTPROV *hCryptProv; 

    pid_t current_pid = getpid();

    const char PREFIX[] ="\\\\.\\HDIMAGE\\c";
    char container[sizeof(PREFIX) + 21];
    if(snprintf(container, sizeof(PREFIX) + 20, "%s%d", PREFIX, current_pid) < 0)
        return 1;

    hCryptProv = (HCRYPTPROV*) malloc(sizeof(HCRYPTPROV));
    memset(hCryptProv, 0, sizeof(HCRYPTPROV));

    if(!CryptAcquireContext(hCryptProv, container, NULL, PROV_GOST_2001_DH, CRYPT_SILENT)) {
        // if not exist - try to create
        if(!CryptAcquireContext(hCryptProv, container, NULL, PROV_GOST_2001_DH, CRYPT_SILENT|CRYPT_NEWKEYSET)) {
            printf("Got error: %x\n", GetLastError());
            return 1;
        }
    }

    return 0;
}

int main(void) {

    if(acquire_crypto_context()) 
        printf("First call failed for %d\n", getpid());
    else
        printf("First call succeed for %d\n", getpid());
        
    fork();
    
    if(acquire_crypto_context()) 
        printf("Second call failed for %d\n", getpid());
    else
        printf("Second call succeed for %d\n", getpid());
        
    return 0;
}