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char *secret;

secret = (char *)malloc(size+1);
if (!secret) {
  /* Handle Error */
}
secret = create_secret();

/* Perform operations using secret... */

free(secret);
secret = NULL;

#include <sys/resource.h>
/* ... */
struct rlimit limit;
char *secret;

limit.rlim_cur = 0;
limit.rlim_max = 0;
if (setrlimit(RLIMIT_CORE, &limit) != 0) {
    /* Handle Error */
}

/* Create or otherwise obtain some sensitive data */
fgets(secret, sizeof(secret), stdin);

#include <sys/resource.h>
/* ... */
struct rlimit limit;
char *secret;

limit.rlim_cur = 0;
limit.rlim_max = 0;
if (setrlimit(RLIMIT_CORE, &limit) != 0) {
    /* Handle Error */
}

if (mlock(secret, sizeof(secret)) != 0) {
    /* Handle error */
}

/* Create or otherwise obtain some sensitive data */
fgets(secret, sizeof(secret), stdin);

char *secret;

if (VirtualLock(secret, sizeof(secret)) != 0) {
    /* Handle error */
}

/* Create or otherwise obtain some sensitive data */
fgets(secret, sizeof(secret), stdin);