adamdunkels | a2f3c42 | 2004-09-12 20:24:53 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2004, Swedish Institute of Computer Science. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. Neither the name of the Institute nor the names of its contributors |
| 14 | * may be used to endorse or promote products derived from this software |
| 15 | * without specific prior written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 27 | * SUCH DAMAGE. |
| 28 | * |
| 29 | * This file is part of the Contiki operating system. |
| 30 | * |
| 31 | * Author: Adam Dunkels <adam@sics.se> |
| 32 | * |
adamdunkels | d393e30 | 2005-02-07 07:50:35 +0000 | [diff] [blame] | 33 | * $Id: ek-service.h,v 1.4 2005/02/07 07:50:35 adamdunkels Exp $ |
adamdunkels | a2f3c42 | 2004-09-12 20:24:53 +0000 | [diff] [blame] | 34 | */ |
adamdunkels | d393e30 | 2005-02-07 07:50:35 +0000 | [diff] [blame] | 35 | |
| 36 | /** |
| 37 | * \addtogroup ek |
| 38 | * @{ |
| 39 | */ |
| 40 | |
| 41 | /** |
| 42 | * \defgroup ekservice The service layer |
| 43 | * @{ |
| 44 | */ |
| 45 | |
| 46 | /** |
| 47 | * \file |
| 48 | * Service layer header file. |
| 49 | * \author Adam Dunkels <adam@sics.se> |
| 50 | */ |
| 51 | |
adamdunkels | a8c2b49 | 2004-07-04 15:01:58 +0000 | [diff] [blame] | 52 | #ifndef __EK_SERVICE_H__ |
| 53 | #define __EK_SERVICE_H__ |
| 54 | |
| 55 | #include "ek.h" |
| 56 | |
| 57 | struct ek_service { |
| 58 | const char *name; |
| 59 | ek_id_t id; |
| 60 | }; |
adamdunkels | d393e30 | 2005-02-07 07:50:35 +0000 | [diff] [blame] | 61 | |
| 62 | /** |
| 63 | * Declare a service state. |
| 64 | * |
| 65 | * This macro declares a service state. The service state is used to |
| 66 | * access a particular service. The declared service state serves as |
| 67 | * the input to all other service functions. |
| 68 | * |
| 69 | * \param service The name of the service state. |
| 70 | * \param name The name of the service - this is defined in the header file of the service. |
| 71 | * |
| 72 | * \hideinitializer |
| 73 | */ |
adamdunkels | a8c2b49 | 2004-07-04 15:01:58 +0000 | [diff] [blame] | 74 | #define EK_SERVICE(service, name) \ |
| 75 | static struct ek_service service = {name, EK_ID_NONE} |
| 76 | |
adamdunkels | d393e30 | 2005-02-07 07:50:35 +0000 | [diff] [blame] | 77 | /** |
| 78 | * Start a service. |
| 79 | * |
| 80 | * This function is called from within a service in order to start the |
| 81 | * service process and to register the service with Contiki. If |
| 82 | * another instance of the same service is running, it is requested to |
| 83 | * shut itself down before the current service is started. |
| 84 | * |
| 85 | * This function is the equivalent of ek_start() but for services. |
| 86 | * |
| 87 | * \note Do not call the function ek_start() from a service, use |
| 88 | * ek_service_start() instead. |
| 89 | * |
| 90 | * \param name The name of the service. The first part of the name |
| 91 | * must be indentical for all services of the same kind. |
| 92 | * |
| 93 | * \param p The process structure for the service. |
| 94 | * |
| 95 | * \return The process ID of the service. |
| 96 | */ |
adamdunkels | a8c2b49 | 2004-07-04 15:01:58 +0000 | [diff] [blame] | 97 | ek_id_t ek_service_start(const char *name, struct ek_proc *p); |
| 98 | |
adamdunkels | d393e30 | 2005-02-07 07:50:35 +0000 | [diff] [blame] | 99 | /** |
| 100 | * Find a running service. |
| 101 | * |
| 102 | * This function finds a running service. The function is called from |
| 103 | * programs that utilize the service, not from within a service process. |
| 104 | * |
| 105 | * Example: |
| 106 | \code |
| 107 | #include "packet-service.h" |
| 108 | |
| 109 | EK_SERVICE(packetservice, PACKET_SERVICE_NAME); |
| 110 | |
| 111 | void stop_packetservice(void) { |
| 112 | if(ek_service_find(&packetservice) == EK_ERR_OK) { |
| 113 | ek_service_post(&packetservice, EK_EVENT_REQUEST_EXIT, NULL); |
| 114 | ek_service_reset(&packetservice); |
| 115 | } |
| 116 | } |
| 117 | \endcode |
| 118 | * |
| 119 | * \param s The service state. This state is filled in with |
| 120 | * information by the ek_service_find() function. |
| 121 | * |
| 122 | * \retval EK_ERR_OK The requested service was found. |
| 123 | * \retval EK_ERR_NOTFOUND The requested service was not found. |
| 124 | */ |
adamdunkels | a8c2b49 | 2004-07-04 15:01:58 +0000 | [diff] [blame] | 125 | ek_err_t ek_service_find(struct ek_service *s); |
| 126 | |
adamdunkels | d393e30 | 2005-02-07 07:50:35 +0000 | [diff] [blame] | 127 | /** |
| 128 | * Retrieve the service interface for a running service. |
| 129 | * |
| 130 | * This function retrieves the service interface (the API for the |
| 131 | * service) for a running service. The service state must first have |
| 132 | * been looked up using the ek_service_find() function. |
| 133 | * |
| 134 | * This function is used in the service stub. |
| 135 | * |
| 136 | * Example |
| 137 | \code |
| 138 | #include "packet-service.h" |
| 139 | |
| 140 | EK_SERVICE(packetservice, PACKET_SERVICE_NAME); |
| 141 | |
| 142 | static struct packet_service_interface * |
| 143 | find_interface(void) |
| 144 | { |
| 145 | struct packet_service_interface *interface; |
| 146 | interface = (struct packet_service_interface *)ek_service_state(&service); |
| 147 | if(interface != NULL && |
| 148 | interface->version == PACKET_SERVICE_VERSION) { |
| 149 | return interface; |
| 150 | } else { |
| 151 | return NULL; |
| 152 | } |
| 153 | } |
| 154 | \endcode |
| 155 | * |
| 156 | * \param s The service state that previously has been looked up with |
| 157 | * ek_service_find(). |
| 158 | * |
| 159 | * \return A pointer to the service interface if the requested service |
| 160 | * is running, or NULL if no such service was found. |
| 161 | */ |
adamdunkels | a8c2b49 | 2004-07-04 15:01:58 +0000 | [diff] [blame] | 162 | void *ek_service_state(struct ek_service *s); |
| 163 | |
adamdunkels | d393e30 | 2005-02-07 07:50:35 +0000 | [diff] [blame] | 164 | /** |
| 165 | * Reset a service. |
| 166 | * |
| 167 | * When a service is looked up by Contiki, the process ID of the |
| 168 | * service is cached. This function resets the cache so that a running |
| 169 | * service can be removed from the system. |
| 170 | * |
| 171 | * Example: |
| 172 | \code |
| 173 | #include "packet-service.h" |
| 174 | |
| 175 | EK_SERVICE(packetservice, PACKET_SERVICE_NAME); |
| 176 | |
| 177 | void stop_packetservice(void) { |
| 178 | if(ek_service_find(&packetservice) == EK_ERR_OK) { |
| 179 | ek_service_post(&packetservice, EK_EVENT_REQUEST_EXIT, NULL); |
| 180 | ek_service_reset(&packetservice); |
| 181 | } |
| 182 | } |
| 183 | \endcode |
| 184 | * |
| 185 | * \param s The service state. |
| 186 | */ |
adamdunkels | 4e85294 | 2004-09-12 07:21:45 +0000 | [diff] [blame] | 187 | void ek_service_reset(struct ek_service *s); |
| 188 | |
adamdunkels | d393e30 | 2005-02-07 07:50:35 +0000 | [diff] [blame] | 189 | /** |
| 190 | * Post an event to a running service. |
| 191 | * |
| 192 | * This macro posts an event to a running service. The service must |
| 193 | * first be looked up using ek_service_find(). |
| 194 | * |
| 195 | * \sa ek_post(). |
| 196 | * |
| 197 | * \param s The service state |
| 198 | * \param ev The event to be posted. |
| 199 | * \param data An opaque pointer to be posted with the event. |
| 200 | * |
| 201 | * \hideinitializer |
| 202 | */ |
| 203 | #define ek_service_post(s, ev, data) ek_post((s)->id, (ev), (data)) |
adamdunkels | a8c2b49 | 2004-07-04 15:01:58 +0000 | [diff] [blame] | 204 | |
| 205 | /*ek_err_t ek_service_call(struct ek_service *s, |
| 206 | ek_event_t ev, ek_data_t data);*/ |
| 207 | |
adamdunkels | d393e30 | 2005-02-07 07:50:35 +0000 | [diff] [blame] | 208 | /** @} */ |
| 209 | /** @} */ |
| 210 | |
adamdunkels | a8c2b49 | 2004-07-04 15:01:58 +0000 | [diff] [blame] | 211 | #endif /* __EK_SERVICE_H__ */ |
adamdunkels | d393e30 | 2005-02-07 07:50:35 +0000 | [diff] [blame] | 212 | |