1: /*************************************************************************
2: * (C) 2008 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
3: * by Michael Pounov <misho@openbsd-bg.org>
4: *
5: * $Author: misho $
6: * $Id: aitsess.h,v 1.4 2013/05/30 09:10:13 misho Exp $
7: *
8: **************************************************************************
9: The ELWIX and AITNET software is distributed under the following
10: terms:
11:
12: All of the documentation and software included in the ELWIX and AITNET
13: Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
14:
15: Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
16: by Michael Pounov <misho@elwix.org>. All rights reserved.
17:
18: Redistribution and use in source and binary forms, with or without
19: modification, are permitted provided that the following conditions
20: are met:
21: 1. Redistributions of source code must retain the above copyright
22: notice, this list of conditions and the following disclaimer.
23: 2. Redistributions in binary form must reproduce the above copyright
24: notice, this list of conditions and the following disclaimer in the
25: documentation and/or other materials provided with the distribution.
26: 3. All advertising materials mentioning features or use of this software
27: must display the following acknowledgement:
28: This product includes software developed by Michael Pounov <misho@elwix.org>
29: ELWIX - Embedded LightWeight unIX and its contributors.
30: 4. Neither the name of AITNET nor the names of its contributors
31: may be used to endorse or promote products derived from this software
32: without specific prior written permission.
33:
34: THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
35: ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
36: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
37: ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
38: FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
39: DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
40: OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
41: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
42: LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
43: OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44: SUCH DAMAGE.
45: */
46: #ifndef __AITSESS_H
47: #define __AITSESS_H
48:
49:
50: #include <pthread.h>
51: #include <semaphore.h>
52: #include <elwix.h>
53:
54: #define SHARED_UNKNOWN -1
55: #define SHARED_IPC 0
56: #define SHARED_MAP 1
57:
58: #define SESS_OPT_SEED -1
59:
60: #define SESS_F_ADD 0x10000000
61: #define SESS_F_DEF 0x20000000
62:
63: #define SESS_RET_NEW(x) (((x) & SESS_F_ADD) == SESS_F_ADD)
64: #define SESS_RET_DEF(x) (((x) & SESS_F_DEF) == SESS_F_DEF)
65: #define SESS_RET_VAL(x) ((x) & 0x0fffffff)
66:
67: /* Shared memory session */
68:
69: typedef struct tagSess {
70: key_t sess_key;
71: char sess_type;
72: char sess_zcpy;
73:
74: char sess_name[STRSIZ];
75: off_t sess_size;
76: void *sess_addr;
77: off_t sess_offset;
78:
79: union {
80: int shmid;
81: int fd;
82: } sess_mem;
83: union {
84: int semid;
85: sem_t *sid;
86: } sess_id;
87:
88: /* Session callbacks */
89: struct {
90: int (*create)(int, long, void *, ...);
91: void (*destroy)(void *);
92: void *(*attach)(void *, void *);
93: void (*detach)(void *);
94: void (*notSem)(void *);
95: int (*isSemOK)(void *);
96: int (*incSem)(void *);
97: int (*decSem)(void *);
98: } sess;
99: } sess_t;
100:
101: /* --------------------------------------------------------- */
102:
103: #define ALLOC_MEMORY(sd, siz, s, ...) (assert((s) && (s)->sess.create), \
104: (s)->sess.create((sd), (siz), (s), ## __VA_ARGS__))
105: #define ATTACH_MEMORY(s) (assert((s) && (s)->sess.attach), (s)->sess.attach((s), NULL))
106: #define DETACH_MEMORY(s) (assert((s) && (s)->sess.detach), (s)->sess.detach((s)))
107: #define FREE_MEMORY(s) (assert((s) && (s)->sess.destroy), (s)->sess.destroy((s)))
108:
109: #define IS_SEMOK(s) (assert((s) && (s)->sess.isSemOK), (s)->sess.isSemOK((s)))
110: #define INC_SEM(s) (assert((s) && (s)->sess.incSem), (s)->sess.incSem((s)))
111: #define DEC_SEM(s) (assert((s) && (s)->sess.decSem), (s)->sess.decSem((s)))
112: #define NOT_SEM(s) (assert((s) && (s)->sess.notSem), (s)->sess.notSem((s)))
113:
114: /* --------------------------------------------------------- */
115:
116:
117: /*
118: * sess_initSession() - Initializing session structure,
119: * if session file not exists creating with specified tech
120: *
121: * @id = Technology using in session. SHARED_IPC IPC tech or SHARED_MAP BSD MemoryMap tech
122: * @csFName = Session filename for build key and identified
123: * @Sess = Session item, if =NULL allocate memory for session after use must be free!
124: * return: 0 OK new key created, -1 error: no memory or file not created, 1 OK key finded
125: */
126: int sess_initSession(int id, const char *csFName, sess_t ** __restrict Sess);
127: /*
128: * sess_freeSession() - Free allocated memory for session item and delete session file if present name
129: *
130: * @Sess = Session item
131: * return: none
132: */
133: void sess_freeSession(sess_t ** __restrict Sess);
134:
135: /*
136: * map_createSession() - MMAP Created session and allocated resources
137: *
138: * @nSeed = Seed for securing key, if =SESS_OPT_SEED must add ready for use key
139: * @nSize = Allocated shared memory size in bytes
140: * @Sess = Session item
141: * @... = If nSeed == -1 add ready for use key value
142: * return: 0 Ok successful, -1 error: not allocated resources
143: */
144: int map_createSession(int nSeed, long nSize, sess_t * __restrict Sess, ...);
145: /*
146: * map_destroySession() - MMAP free shared resources
147: *
148: * @Sess = Session item
149: * return: none
150: */
151: void map_destroySession(sess_t * __restrict Sess);
152:
153: /*
154: * ipc_createSession() - IPC Created session and allocated resources
155: *
156: * @nSeed = Seed for securing key, if =SESS_OPT_SEED must add ready for use key
157: * @nSize = Allocated shared memory size in bytes
158: * @Sess = Session item
159: * @... = If nSeed == -1 add ready for use key value
160: * return: 0 Ok successful, -1 error: not allocated resources
161: */
162: int ipc_createSession(int nSeed, long nSize, sess_t * __restrict Sess, ...);
163: /*
164: * ipc_destroySession() - IPC free shared resources
165: *
166: * @Sess = Session item
167: * return: none
168: */
169: void ipc_destroySession(sess_t * __restrict Sess);
170:
171: /*
172: * map_attachSession() - MMAP Attach to shared memory & return begin address
173: *
174: * @s = Session item
175: * @procMem = Custom start address (optionl) *default must be 0*
176: * return: NULL failed attach, !=NULL begin address of memory
177: */
178: void *map_attachSession(sess_t * __restrict s, void *procMem);
179: /*
180: * map_detachSession() - MMAP Detach from shared memory
181: *
182: * @s = Session item
183: * return: none
184: */
185: void map_detachSession(sess_t * __restrict s);
186:
187: /*
188: * ipc_attachSession() - IPC Attach to shared memory & return begin address
189: *
190: * @s = Session item
191: * @procMem = Custom start address (optionl) *default must be 0*
192: * return: NULL failed attach, !=NULL begin address of memory
193: */
194: void *ipc_attachSession(sess_t * __restrict s, void *procMem);
195: /*
196: * ipc_detachSession() - IPC Detach from shared memory
197: *
198: * @s = Session item
199: * return: none
200: */
201: void ipc_detachSession(sess_t * __restrict s);
202:
203: /*
204: * sess_isAttached() - Check for attached shared memory
205: *
206: * @s = Session item
207: * return: -1 null session item, 0 not attached, 1 attached memory
208: */
209: int sess_isAttached(sess_t * __restrict s);
210:
211:
212: /*
213: * map_notSemaphore() - MMAP negative block if semaphore isn`t signaled
214: *
215: * @s = Session item
216: * return: none
217: */
218: void map_notSemaphore(sess_t * __restrict s);
219: /*
220: * map_isSemaphoreOK() - MMAP Check semaphore
221: *
222: * @s = Session item
223: * return: -1 error: can`t return semaphore, 0 = false, 1 = true
224: */
225: int map_isSemaphoreOK(sess_t * __restrict s);
226: /*
227: * map_incSemaphore() - MMAP unblock semaphore, increment semaphore
228: *
229: * @s = Session item
230: * return: 0 Ok, -1 error: can`t increment
231: */
232: int map_incSemaphore(sess_t * __restrict s);
233: /*
234: * map_decSemaphore() - MMAP block semaphore, decrement semaphore
235: *
236: * @s = Session item
237: * return: 0 Ok, -1 error: can`t decrement
238: */
239: int map_decSemaphore(sess_t * __restrict s);
240:
241: /*
242: * ipc_notSemaphore() - IPC negative block if semaphore isn`t signaled
243: *
244: * @s = Session item
245: * return: none
246: */
247: void ipc_notSemaphore(sess_t * __restrict s);
248: /*
249: * ipc_isSemaphoreOK() - IPC Check semaphore
250: *
251: * @s = Session item
252: * return: -1 error: can`t return semaphore, 0 = false, 1 = true
253: */
254: int ipc_isSemaphoreOK(sess_t * __restrict s);
255: /*
256: * ipc_incSemaphore() - IPC unblock semaphore, increment semaphore
257: *
258: * @s = Session item
259: * return: 0 Ok, -1 error: can`t increment
260: */
261: int ipc_incSemaphore(sess_t * __restrict s);
262: /*
263: * ipc_decSemaphore() - IPC block semaphore, decrement semaphore
264: *
265: * @s = Session item
266: * return: 0 Ok, -1 error: can`t decrement
267: */
268: int ipc_decSemaphore(sess_t * __restrict s);
269:
270:
271: /*
272: * sess_GetValues() - Get all values from session shared memory
273: *
274: * @s = Session item
275: * @Vals = Return array strings
276: * return: -1 error: in parameter, !=-1 count of returned strings in Vals
277: * (must call ait_freeVars() after use!)
278: */
279: int sess_GetValues(sess_t * __restrict s, array_t ** __restrict Vals);
280: /*
281: * sess_GetValue() - Get value from session shared memory from attribute
282: *
283: * @s = Session item
284: * @csAttr = Attribute for search
285: * @v = Return string value and after use must call ait_freeVar(), also may be =NULL
286: * return: 0 not found, -1 error: in parameter, >0 get position,
287: * if define item merged with IS_DEF
288: */
289: int sess_GetValue(sess_t * __restrict s, const char *csAttr, ait_val_t ** __restrict v);
290: /*
291: * sess_DelValue() - Delete item from session shared memory
292: *
293: * @s = Session item
294: * @csAttr = Attribute for erasing
295: * return: -1 error: in parameter or !=-1 deleted items
296: */
297: int sess_DelValue(sess_t * __restrict s, const char *csAttr);
298: /*
299: * sess_SetValue() - Set item into session shared memory or update if exists
300: *
301: * @s = Session item
302: * @csAttr = Attribute
303: * @psVal = Value
304: * return: 0 nothing, -1 error: in parameter,
305: >0 set position, if added new item merged with SESS_F_ADD and
306: if just define item merged with SESS_F_DEF
307: */
308: int sess_SetValue(sess_t * __restrict s, const char *csAttr, const char *psVal);
309:
310: /*
311: * sess_prepareSession() - Attach to shared memory and de-marshaling data
312: *
313: * @s = Session
314: * @useDirect = Use direct shared memory if !=0 or snapshot of data to array
315: * return: NULL error or no data, !=NULL array with variables,
316: * after use must free resources with sess_doneSession()
317: */
318: array_t *sess_prepareSession(sess_t * __restrict s, char useDirect);
319: /*
320: * sess_doneSession() - Free resources allocated with sess_prepareSession()
321: *
322: * @s = Session
323: * @arr = Array with variables for free
324: * return: none
325: */
326: void sess_doneSession(sess_t * __restrict s, array_t ** __restrict arr);
327: /*
328: * sess_commitSession() - Commit data to shared memory
329: *
330: * @s = Session
331: * @arr = Array with variables for save
332: * return -1 error or !=-1 size of stored variables into shared memory
333: */
334: int sess_commitSession(sess_t * __restrict s, array_t * __restrict arr);
335:
336:
337: #endif
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