/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 * Copyright 2013 Joyent, Inc.  All rights reserved.
 * Copyright 2017 OmniOS Community Edition (OmniOSce) Association.
 */

#include "libscf_impl.h"

#include <assert.h>
#include <dlfcn.h>
#include <libintl.h>
#include <pthread.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/machelf.h>
#include <thread.h>

#include <ucontext.h>

extern int ndebug;

static struct scf_error_info {
        scf_error_t     ei_code;
        const char      *ei_desc;
} scf_errors[] = {
        {SCF_ERROR_NONE,                "no error"},
        {SCF_ERROR_NOT_BOUND,           "handle not bound"},
        {SCF_ERROR_NOT_SET,             "cannot use unset argument"},
        {SCF_ERROR_NOT_FOUND,           "entity not found"},
        {SCF_ERROR_TYPE_MISMATCH,       "type does not match value"},
        {SCF_ERROR_IN_USE,              "cannot modify while in-use"},
        {SCF_ERROR_CONNECTION_BROKEN,   "connection to repository broken"},
        {SCF_ERROR_INVALID_ARGUMENT,    "invalid argument"},
        {SCF_ERROR_NO_MEMORY,           "no memory available"},
        {SCF_ERROR_CONSTRAINT_VIOLATED, "required constraint not met"},
        {SCF_ERROR_EXISTS,              "object already exists"},
        {SCF_ERROR_NO_SERVER,           "repository server unavailable"},
        {SCF_ERROR_NO_RESOURCES,        "server has insufficient resources"},
        {SCF_ERROR_PERMISSION_DENIED,   "insufficient privileges for action"},
        {SCF_ERROR_BACKEND_ACCESS,      "backend refused access"},
        {SCF_ERROR_BACKEND_READONLY,    "backend is read-only"},
        {SCF_ERROR_HANDLE_MISMATCH,     "mismatched SCF handles"},
        {SCF_ERROR_HANDLE_DESTROYED,    "object bound to destroyed handle"},
        {SCF_ERROR_VERSION_MISMATCH,    "incompatible SCF version"},
        {SCF_ERROR_DELETED,             "object has been deleted"},
        {SCF_ERROR_TEMPLATE_INVALID,    "template data is invalid"},

        {SCF_ERROR_CALLBACK_FAILED,     "user callback function failed"},

        {SCF_ERROR_INTERNAL,            "internal error"}
};
#define SCF_NUM_ERRORS  (sizeof (scf_errors) / sizeof (*scf_errors))

/* a SWAG just in case things get out of sync, we can notice */
#define LOOKS_VALID(e)  \
        ((e) >= scf_errors[0].ei_code && \
            (e) < scf_errors[SCF_NUM_ERRORS - 1].ei_code + 10)

static scf_error_t      _scf_fallback_error = SCF_ERROR_NONE;

#if defined(PTHREAD_ONCE_KEY_NP)

static pthread_key_t    scf_error_key = PTHREAD_ONCE_KEY_NP;

int
scf_setup_error(void)
{
        return (pthread_key_create_once_np(&scf_error_key, NULL) == 0);
}

#else   /* PTHREAD_ONCE_KEY_NP */

/*
 * This old code is here to enable the building of a native version
 * of libscf.so when the build machine has not yet been upgraded
 * to a version of libc that provides pthread_key_create_once_np().
 * It should be deleted when solaris_nevada ships.
 * This code is not MT-safe in a relaxed memory model.
 */

static pthread_key_t    scf_error_key = 0;

int
scf_setup_error(void)
{
        static pthread_mutex_t scf_key_lock = PTHREAD_MUTEX_INITIALIZER;
        static volatile int scf_error_key_setup = 0;

        if (scf_error_key_setup == 0) {
                (void) pthread_mutex_lock(&scf_key_lock);
                if (scf_error_key_setup == 0) {
                        if (pthread_key_create(&scf_error_key, NULL) == 0)
                                scf_error_key_setup = 1;
                }
                (void) pthread_mutex_unlock(&scf_key_lock);
        }

        return (scf_error_key_setup == 1);
}

#endif  /* PTHREAD_ONCE_KEY_NP */

int
scf_set_error(scf_error_t code)
{
        assert(LOOKS_VALID(code));

        if (scf_setup_error())
                (void) pthread_setspecific(scf_error_key, (void *)code);
        else
                _scf_fallback_error = code;
        return (-1);
}

scf_error_t
scf_error(void)
{
        scf_error_t ret;

        ret = (scf_error_t)pthread_getspecific(scf_error_key);
        if (ret == 0)
                return (_scf_fallback_error);
        assert(LOOKS_VALID(ret));
        return (ret);
}

const char *
scf_strerror(scf_error_t code)
{
        struct scf_error_info *cur, *end;

        cur = scf_errors;
        end = cur + SCF_NUM_ERRORS;

        for (; cur < end; cur++)
                if (code == cur->ei_code)
                        return (dgettext(TEXT_DOMAIN, cur->ei_desc));

        return (dgettext(TEXT_DOMAIN, "unknown error"));
}

const char *
scf_get_msg(scf_msg_t msg)
{
        switch (msg) {
        case SCF_MSG_ARGTOOLONG:
                return (dgettext(TEXT_DOMAIN,
                    "Argument '%s' is too long, ignoring\n"));

        case SCF_MSG_PATTERN_NOINSTANCE:
                return (dgettext(TEXT_DOMAIN,
                    "Pattern '%s' doesn't match any instances\n"));

        case SCF_MSG_PATTERN_NOINSTSVC:
                return (dgettext(TEXT_DOMAIN,
                    "Pattern '%s' doesn't match any instances or services\n"));

        case SCF_MSG_PATTERN_NOSERVICE:
                return (dgettext(TEXT_DOMAIN,
                    "Pattern '%s' doesn't match any services\n"));

        case SCF_MSG_PATTERN_NOENTITY:
                return (dgettext(TEXT_DOMAIN,
                    "Pattern '%s' doesn't match any entities\n"));

        case SCF_MSG_PATTERN_MULTIMATCH:
                return (dgettext(TEXT_DOMAIN,
                    "Pattern '%s' matches multiple instances:\n"));

        case SCF_MSG_PATTERN_POSSIBLE:
                return (dgettext(TEXT_DOMAIN, "    %s\n"));

        case SCF_MSG_PATTERN_LEGACY:
                return (dgettext(TEXT_DOMAIN,
                    "Operation not supported for legacy service '%s'\n"));

        case SCF_MSG_PATTERN_MULTIPARTIAL:
                return (dgettext(TEXT_DOMAIN,
                    "Partial FMRI '%s' matches multiple instances:\n"));

        default:
                abort();
                /* NOTREACHED */
        }

}