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 1.2 2013/03/13 14:54:39 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 IS_VAL 0x0
59: #define IS_ADD 0x40000000
60: #define IS_DEF 0x80000000
61:
62: #define ISNEW(x) (((x) & IS_ADD) == IS_ADD)
63: #define ISDEF(x) (((x) & IS_DEF) == IS_DEF)
64:
65: #define MAX_ATTRIBUTE 64
66: #define MAX_SEMNAME 14
67:
68:
69: /* Shared memory session */
70:
71: typedef struct tagSess {
72: key_t key;
73: char type;
74: char zcpy;
75:
76: char name[BUFSIZ];
77: off_t eom;
78: void *addr;
79: off_t offset;
80: union {
81: int shmid;
82: int fd;
83: } mem;
84: union {
85: int semid;
86: sem_t *sid;
87: } id;
88:
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: } ait_sess_t;
100:
101:
102: /*
103: * sess_initSession() - Initializing session structure,
104: * if session file not exists creating with specified tech
105: *
106: * @id = Technology using in session. SHARED_IPC IPC tech or SHARED_MAP BSD MemoryMap tech
107: * @csFName = Session filename for build key and identified
108: * @Sess = Session item, if =NULL allocate memory for session after use must be free!
109: * return: 0 OK new key created, -1 error: no memory or file not created, 1 OK key finded
110: */
111: int sess_initSession(int id, const char *csFName, ait_sess_t ** __restrict Sess);
112: /*
113: * sess_freeSession() - Free allocated memory for session item and delete session file if present name
114: *
115: * @Sess = Session item
116: * return: none
117: */
118: void sess_freeSession(ait_sess_t ** __restrict Sess);
119:
120: /*
121: * map_createSession() - MMAP Created session and allocated resources
122: *
123: * @nSeed = Seed for securing key, if =-1 must add ready for use key
124: * @nSize = Allocated shared memory size in bytes
125: * @Sess = Session item
126: * @... = If nSeed == -1 add ready for use key value
127: * return: 0 Ok successful, -1 error: not allocated resources
128: */
129: int map_createSession(int nSeed, long nSize, ait_sess_t * __restrict Sess, ...);
130: /*
131: * map_destroySession() - MMAP free shared resources
132: *
133: * @Sess = Session item
134: * return: none
135: */
136: void map_destroySession(ait_sess_t * __restrict Sess);
137:
138: /*
139: * ipc_createSession() - IPC Created session and allocated resources
140: *
141: * @nSeed = Seed for securing key, if =-1 must add ready for use key
142: * @nSize = Allocated shared memory size in bytes
143: * @Sess = Session item
144: * @... = If nSeed == -1 add ready for use key value
145: * return: 0 Ok successful, -1 error: not allocated resources
146: */
147: int ipc_createSession(int nSeed, long nSize, ait_sess_t * __restrict Sess, ...);
148: /*
149: * ipc_destroySession() - IPC free shared resources
150: *
151: * @Sess = Session item
152: * return: none
153: */
154: void ipc_destroySession(ait_sess_t * __restrict Sess);
155:
156: /*
157: * map_attachSession() - MMAP Attach to shared memory & return begin address
158: *
159: * @s = Session item
160: * @procMem = Custom start address (optionl) *default must be 0*
161: * return: NULL failed attach, !=NULL begin address of memory
162: */
163: void *map_attachSession(ait_sess_t * __restrict s, void *procMem);
164: /*
165: * map_detachSession() - MMAP Detach from shared memory
166: *
167: * @s = Session item
168: * return: none
169: */
170: void map_detachSession(ait_sess_t * __restrict s);
171:
172: /*
173: * ipc_attachSession() - IPC Attach to shared memory & return begin address
174: *
175: * @s = Session item
176: * @procMem = Custom start address (optionl) *default must be 0*
177: * return: NULL failed attach, !=NULL begin address of memory
178: */
179: void *ipc_attachSession(ait_sess_t * __restrict s, void *procMem);
180: /*
181: * ipc_detachSession() - IPC Detach from shared memory
182: *
183: * @s = Session item
184: * return: none
185: */
186: void ipc_detachSession(ait_sess_t * __restrict s);
187:
188: /*
189: * sess_isAttached() - Check for attached shared memory
190: *
191: * @s = Session item
192: * return: -1 null session item, 0 not attached, 1 attached memory
193: */
194: inline int sess_isAttached(ait_sess_t * __restrict s);
195:
196:
197: /*
198: * map_notSemaphore() - MMAP negative block if semaphore isn`t signaled
199: *
200: * @s = Session item
201: * return: none
202: */
203: void map_notSemaphore(ait_sess_t * __restrict s);
204: /*
205: * map_isSemaphoreOK() - MMAP Check semaphore
206: *
207: * @s = Session item
208: * return: -1 error: can`t return semaphore, 0 = false, 1 = true
209: */
210: int map_isSemaphoreOK(ait_sess_t * __restrict s);
211: /*
212: * map_incSemaphore() - MMAP unblock semaphore, increment semaphore
213: *
214: * @s = Session item
215: * return: 0 Ok, -1 error: can`t increment
216: */
217: int map_incSemaphore(ait_sess_t * __restrict s);
218: /*
219: * map_decSemaphore() - MMAP block semaphore, decrement semaphore
220: *
221: * @s = Session item
222: * return: 0 Ok, -1 error: can`t decrement
223: */
224: int map_decSemaphore(ait_sess_t * __restrict s);
225:
226: /*
227: * ipc_notSemaphore() - IPC negative block if semaphore isn`t signaled
228: *
229: * @s = Session item
230: * return: none
231: */
232: void ipc_notSemaphore(ait_sess_t * __restrict s);
233: /*
234: * ipc_isSemaphoreOK() - IPC Check semaphore
235: *
236: * @s = Session item
237: * return: -1 error: can`t return semaphore, 0 = false, 1 = true
238: */
239: int ipc_isSemaphoreOK(ait_sess_t * __restrict s);
240: /*
241: * ipc_incSemaphore() - IPC unblock semaphore, increment semaphore
242: *
243: * @s = Session item
244: * return: 0 Ok, -1 error: can`t increment
245: */
246: int ipc_incSemaphore(ait_sess_t * __restrict s);
247: /*
248: * ipc_decSemaphore() - IPC block semaphore, decrement semaphore
249: *
250: * @s = Session item
251: * return: 0 Ok, -1 error: can`t decrement
252: */
253: int ipc_decSemaphore(ait_sess_t * __restrict s);
254:
255:
256: /* --------------------------------------------------------- */
257:
258: #define ALLOC_MEMORY(sd, siz, s, ...) (assert((s)), (s)->sess.create((sd), \
259: (siz), (s), ## __VA_ARGS__))
260: #define ATTACH_MEMORY(s) (assert((s)), (s)->sess.attach((s), NULL))
261: #define DETACH_MEMORY(s) do { assert((s)); (s)->sess.detach((s)); } while(0)
262: #define FREE_MEMORY(s) do { assert((s)); (s)->sess.destroy((s)); } while(0)
263:
264: #define IS_SEMOK(s) (assert((s)), (s)->sess.isSemOK((s)))
265: #define INC_SEM(s) (assert((s)), (s)->sess.incSem((s)))
266: #define DEC_SEM(s) (assert((s)), (s)->sess.decSem((s)))
267: #define NOT_SEM(s) do { assert((s)); (s)->sess.notSem((s)); } while(0)
268:
269: /* --------------------------------------------------------- */
270:
271: /*
272: * sess_FreeValues() - Free all values from value array allocated from sess_GetValues()
273: *
274: * @ppsVals = Array strings
275: * return: none
276: */
277: inline void sess_FreeValues(char *** __restrict ppsVals);
278: /*
279: * sess_GetValues() - Get all values from session shared memory
280: *
281: * @s = Session item
282: * @ppsVals = Return array strings
283: * return: -1 error: in parameter, !=-1 count of returned strings in ppsVals
284: * (must be sess_FreeValues after use!)
285: */
286: int sess_GetValues(ait_sess_t * __restrict s, char ***ppsVals);
287: /*
288: * sess_GetValue() - Get value from session shared memory from attribute
289: *
290: * @s = Session item
291: * @csAttr = Attribute for search
292: * @psVal = Return string buffer
293: * @pnLen = Length of return string buffer,
294: // *{pnLen} input is max_size of buffer & output is really taken bytes
295: * return: 0 not found, -1 error: in parameter, >0 get position,
296: * if define item merged with IS_DEF
297: */
298: int sess_GetValue(ait_sess_t * __restrict s, const char *csAttr, char *psVal, int *pnLen);
299: /*
300: * sess_DelValue() - Delete item from session shared memory
301: *
302: * @s = Session item
303: * @csAttr = Attribute for erasing
304: * return: 0 Ok, -1 error: in parameter
305: */
306: int sess_DelValue(ait_sess_t * __restrict s, const char *csAttr);
307: /*
308: * sess_SetValue() - Set item into session shared memory or update if exists
309: *
310: * @s = Session item
311: * @csAttr = Attribute
312: * @psVal = Value
313: * return: 0 nothing, -1 error: in parameter,
314: >0 set position, if add item merged with IS_ADD and if define item merged with IS_DEF
315: */
316: int sess_SetValue(ait_sess_t * __restrict s, const char *csAttr, const char *psVal);
317:
318: /*
319: * sess_prepareSession() - Attach to shared memory and de-marshaling data
320: *
321: * @s = Session
322: * @useDirect = Use direct shared memory if !=0 or snapshot of data to array
323: * return: NULL error or no data, !=NULL array with variables,
324: * after use must free resources with sess_doneSession()
325: */
326: array_t *sess_prepareSession(ait_sess_t * __restrict s, char useDirect);
327: /*
328: * sess_doneSession() - Free resources allocated with sess_prepareSession()
329: *
330: * @s = Session
331: * @arr = Array with variables for free
332: * return: none
333: */
334: void sess_doneSession(ait_sess_t * __restrict s, array_t ** __restrict arr);
335: /*
336: * sess_commitSession() - Commit data to shared memory
337: *
338: * @s = Session
339: * @arr = Array with variables for save
340: * return -1 error or !=-1 size of stored variables into shared memory
341: */
342: int sess_commitSession(ait_sess_t * __restrict s, array_t * __restrict arr);
343:
344:
345: #endif
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