init: Introduce internal is_ssh_initialized()

The introduced function returns whether the library is initialized or
not.

Signed-off-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

include/libssh/priv.h

@@ -32,6 +32,7 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
+#include <stdbool.h>
 
 #if !defined(HAVE_STRTOULL)
 # if defined(HAVE___STRTOULL)
@@ -417,4 +418,6 @@ void explicit_bzero(void *s, size_t n);
 
 void ssh_agent_state_free(void *data);
 
+bool is_ssh_initialized(void);
+
 #endif /* _LIBSSH_PRIV_H */

src/init.c

@@ -261,4 +261,23 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL,
 
 #endif /* _WIN32 */
 
+/**
+ * @internal
+ * @brief Return whether the library is initialized
+ *
+ * @returns true if the library is initialized; false otherwise.
+ *
+ * @see ssh_init()
+ */
+bool is_ssh_initialized() {
+
+    bool is_initialized = false;
+
+    ssh_mutex_lock(&ssh_init_mutex);
+    is_initialized = _ssh_initialized > 0;
+    ssh_mutex_unlock(&ssh_init_mutex);
+
+    return is_initialized;
+}
+
 /** @} */

tests/unittests/torture_init.c

@@ -2,6 +2,7 @@
 
 #define LIBSSH_STATIC
 
+#include <errno.h>
 #include "torture.h"
 #include "libssh/libssh.h"
 
@@ -32,11 +33,33 @@ static void torture_ssh_init_after_finalize(void **state) {
     assert_int_equal(rc, SSH_OK);
 }
 
+static void torture_is_ssh_initialized(UNUSED_PARAM(void **state)) {
+
+    int rc;
+    bool initialized = false;
+
+    /* Make sure the library is not initialized */
+    while (is_ssh_initialized()) {
+        rc = ssh_finalize();
+        assert_return_code(rc, errno);
+    }
+
+    rc = ssh_init();
+    assert_return_code(rc, errno);
+    initialized = is_ssh_initialized();
+    assert_true(initialized);
+    rc = ssh_finalize();
+    assert_return_code(rc, errno);
+    initialized = is_ssh_initialized();
+    assert_false(initialized);
+}
+
 int torture_run_tests(void) {
     int rc;
     struct CMUnitTest tests[] = {
         cmocka_unit_test(torture_ssh_init),
         cmocka_unit_test(torture_ssh_init_after_finalize),
+        cmocka_unit_test(torture_is_ssh_initialized),
     };
 
     torture_filter_tests(tests);