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文件: /usr/local/src/netdata/externaldeps/libwebsockets/include/libwebsockets/lws-system.h
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/* * libwebsockets - small server side websockets and web server implementation * * Copyright (C) 2010-2019 Andy Green <andy@warmcat.com> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation: * version 2.1 of the License. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301 USA * * included from libwebsockets.h * * This provides a clean way to interface lws user code to be able to * work unchanged on different systems for fetching common system information, * and performing common system operations like reboot. * * An ops struct with the system-specific implementations is set at * context creation time, and apis are provided that call through to * those where they exist. */ typedef enum { LWS_SYSI_HRS_DEVICE_MODEL = 1, LWS_SYSI_HRS_DEVICE_SERIAL, LWS_SYSI_HRS_FIRMWARE_VERSION, LWS_SYSI_USER_BASE = 100 } lws_system_item_t; typedef union { const char *hrs; /* human readable string */ void *data; time_t t; } lws_system_arg_t; typedef struct lws_system_ops { int (*get_info)(lws_system_item_t i, lws_system_arg_t arg, size_t *len); int (*reboot)(void); } lws_system_ops_t; /* wrappers handle NULL members or no ops struct set at all cleanly */ /** * lws_system_get_info() - get standardized system information * * \param context: the lws_context * \param item: which information to fetch * \param arg: where to place the result * \param len: incoming: max length of result, outgoing: used length of result * * This queries a standardized information-fetching ops struct that can be * applied to the context... the advantage is it allows you to get common items * of information like a device serial number writing the code once, even if the * actual serial number muse be fetched in wildly different ways depending on * the exact platform it's running on. * * Set arg and *len on entry to be the result location and the max length that * can be used there, on seccessful exit *len is set to the actual length and * 0 is returned. On error, 1 is returned. */ LWS_EXTERN LWS_VISIBLE int lws_system_get_info(struct lws_context *context, lws_system_item_t item, lws_system_arg_t arg, size_t *len); /** * lws_system_reboot() - if provided, use the lws_system ops to reboot * * \param context: the lws_context * * If possible, the system will reboot. Otherwise returns 1. */ LWS_EXTERN LWS_VISIBLE int lws_system_reboot(struct lws_context *context);
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