Sample implementation how to read and write credentials with lib secret

libsecret-password-demo.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libsecret/secret.h>

#define SERVICE_NAME "your.service.name"
#define MY_SCHEMA getMySchema()

const SecretSchema* getMySchema (void){
    static const SecretSchema mySchema = {
        SERVICE_NAME, SECRET_SCHEMA_NONE,
        {
            {  "username", SECRET_SCHEMA_ATTRIBUTE_STRING },
            {  "NULL", 0 },
        },
	// Fixing compile warning with a zero and NULLs
	0,    // reserved
	NULL, // reserved1
	NULL, // reserved2
	NULL, // reserved3
	NULL, // reserved4
	NULL, // reserved5
	NULL, // reserved6
	NULL, // reserved7
    };
    return &mySchema;
}

int main(int argc, char **argv) {
  GError *error = NULL;

  GList *items = secret_password_search_sync(MY_SCHEMA, SECRET_SEARCH_ALL, NULL, &error, NULL);
  printf("found %d items\n", g_list_length(items));

  if (error != NULL) {
    g_error("Error retrieving secret: %s", error->message);
    g_error_free(error);
    return EXIT_FAILURE;
  } else if (g_list_length(items) > 0) {

    /* The attributes used to lookup the password should conform to the schema. */
    gchar *password = secret_password_lookup_sync(MY_SCHEMA, NULL, &error, NULL);
    if (error != NULL) {
      /* ... handle the failure here */
      printf("Query password failed.\n");
      g_error_free (error);
    } else if (password == NULL) {
      /* password will be null, if no matching password found */
      printf("No password found\n");
    } else {
      GHashTable *attributes = secret_retrievable_get_attributes(items->data);
      const gchar *username = g_hash_table_lookup(attributes, "username");
      printf("Username: %s\nPassword: %s\n", username, password);

      g_hash_table_unref(attributes);
      g_list_free_full(items, g_object_unref);
      secret_password_free(password);
    }
  }

  /*
   * The variable argument list is the attributes used to later
   * lookup the password. These attributes must conform to the schema.
   */
  secret_password_store_sync (MY_SCHEMA, SECRET_COLLECTION_DEFAULT,
                            "DemoApp", "example password", NULL, &error,
                            "username", "demo user",
                            NULL);

  if (error != NULL) {
    printf("error\n");
    /* ... handle the failure here */
    g_error_free (error);
  } else {
    printf("Password saved!\n");
  }
  return EXIT_SUCCESS;
}