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char const *sdn = "/home/usr1/";
char sfn[] = "/home/usr1/temp-XXXXXX";
FILE *sfp;

if (!secure_dir(sdn)) {
  /* Handle error */
}

int fd = mkstemp(sfn);
if (fd == -1) {
  /* Handle error */
}

/*
 * Unlink immediately to hide the file name.
 * The race condition here is inconsequential if the file
 * is created with exclusive permissions (glibc >= 2.0.7)
 */

if (unlink(sfn);) == -1) {
  /* Handle Error */
}

sfp = fdopen(fd, "w+");
if (sfp == NULL) {
  close(fd);
  /* Handle error */
}

/* use temporary file */

fclose(sfp); /* also closes fd */