Resolver: cancelable resend timer event. It is safe because re-sending still works during graceful shutdown as long as resolving takes place (and resolve tasks set their own timeouts that are not cancelable). Also, the new ctx->cancelable flag can be set to make resolve task's timeout event cancelable.

/*
 * Copyright (C) Maxim Dounin
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>


#if (NGX_HAVE_DLOPEN)

char *
ngx_dlerror(void)
{
    char  *err;

    err = (char *) dlerror();

    if (err == NULL) {
        return "";
    }

    return err;
}

#endif