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 1.3.2.5 2012/02/10 17:14:21 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
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 <assert.h>
51: #include <semaphore.h>
52: #include <sys/types.h>
53: #include <aitio.h>
54:
55: #define SHARED_UNKNOWN -1
56: #define SHARED_IPC 0
57: #define SHARED_MAP 1
58:
59: #define IS_VAL 0x0
60: #define IS_ADD 0x40000000
61: #define IS_DEF 0x80000000
62:
63: #define ISNEW(x) (((x) & IS_ADD) == IS_ADD)
64: #define ISDEF(x) (((x) & IS_DEF) == IS_DEF)
65:
66: #define MAX_ATTRIBUTE 64
67: #define MAX_SEMNAME 14
68:
69:
70: struct tagSess;
71: typedef struct tagSess ait_sess_t;
72:
73: struct tagSess {
74: key_t key;
75: char type;
76: char zcpy;
77:
78: char name[BUFSIZ];
79: off_t eom;
80: void *addr;
81: off_t offset;
82: union {
83: int shmid;
84: int fd;
85: } mem;
86: union {
87: int semid;
88: sem_t *sid;
89: } id;
90:
91: struct {
92: int (*create)(int, long, ait_sess_t * __restrict, ...);
93: void (*destroy)(ait_sess_t * __restrict);
94: void *(*attach)(ait_sess_t * __restrict, void *);
95: void (*detach)(ait_sess_t * __restrict);
96: void (*notSem)(ait_sess_t * __restrict);
97: int (*isSemOK)(ait_sess_t * __restrict);
98: int (*incSem)(ait_sess_t * __restrict);
99: int (*decSem)(ait_sess_t * __restrict);
100: } sess;
101: };
102:
103:
104: // -------------------------------------------------------
105: // sess_GetErrno() Get error code of last operation
106: inline int sess_GetErrno();
107: // sess_GetError() Get error text of last operation
108: inline const char *sess_GetError();
109: // sess_SetErr() Set error to variables for internal use!!!
110: inline void sess_SetErr(int eno, char *estr, ...);
111: // -------------------------------------------------------
112:
113:
114: /*
115: * sess_initSession() Initializing session structure, if session file not exists creating with specified tech
116: *
117: * @id = Technology using in session. SHARED_IPC IPC tech orSHARED_MAP BSD MemoryMap tech
118: * @csFName = Session filename for build key and identified
119: * @Sess = Session item, if =NULL allocate memory for session after use must be free!
120: * return: 0 OK new key created, -1 error: no memory or file not created, 1 OK key finded
121: */
122: int sess_initSession(int id, const char *csFName, ait_sess_t ** __restrict Sess);
123: /*
124: * sess_freeSession() Free allocated memory for session item and delete session file if present name
125: *
126: * @csFName = Session filename for delete, if NULL nothing delete
127: * @Sess = Session item
128: * return: none
129: */
130: void sess_freeSession(const char *csFName, ait_sess_t ** __restrict Sess);
131:
132:
133: /*
134: * map_createSession() MMAP Created session and allocated resources
135: *
136: * @nSeed = Seed for securing key, if =-1 must add ready for use key
137: * @nSize = Allocated shared memory size in bytes
138: * @Sess = Session item
139: * @... = If nSeed == -1 add ready for use key value
140: * return: 0 Ok successful, -1 error: not allocated resources
141: */
142: int map_createSession(int nSeed, long nSize, ait_sess_t * __restrict Sess, ...);
143: /*
144: * map_destroySession() MMAP free shared resources
145: *
146: * @Sess = Session item
147: * return: none
148: */
149: void map_destroySession(ait_sess_t * __restrict Sess);
150:
151: /*
152: * ipc_createSession() IPC Created session and allocated resources
153: *
154: * @nSeed = Seed for securing key, if =-1 must add ready for use key
155: * @nSize = Allocated shared memory size in bytes
156: * @Sess = Session item
157: * @... = If nSeed == -1 add ready for use key value
158: * return: 0 Ok successful, -1 error: not allocated resources
159: */
160: int ipc_createSession(int nSeed, long nSize, ait_sess_t * __restrict Sess, ...);
161: /*
162: * ipc_destroySession() IPC free shared resources
163: *
164: * @Sess = Session item
165: * return: none
166: */
167: void ipc_destroySession(ait_sess_t * __restrict Sess);
168:
169: /*
170: * map_attachSession() MMAP Attach to shared memory & return begin address
171: *
172: * @s = Session item
173: * @procMem = Custom start address (optionl) *default must be 0*
174: * return: NULL failed attach, !=NULL begin address of memory
175: */
176: void *map_attachSession(ait_sess_t * __restrict s, void *procMem);
177: /*
178: * map_detachSession() MMAP Detach from shared memory
179: *
180: * @s = Session item
181: * return: none
182: */
183: void map_detachSession(ait_sess_t * __restrict s);
184:
185: /*
186: * ipc_attachSession() IPC Attach to shared memory & return begin address
187: *
188: * @s = Session item
189: * @procMem = Custom start address (optionl) *default must be 0*
190: * return: NULL failed attach, !=NULL begin address of memory
191: */
192: void *ipc_attachSession(ait_sess_t * __restrict s, void *procMem);
193: /*
194: * ipc_detachSession() IPC Detach from shared memory
195: *
196: * @s = Session item
197: * return: none
198: */
199: void ipc_detachSession(ait_sess_t * __restrict s);
200:
201: /*
202: * sess_isAttached() Check for attached shared memory
203: *
204: * @s = Session item
205: * return: -1 null session item, 0 not attached, 1 attached memory
206: */
207: inline int sess_isAttached(ait_sess_t * __restrict s);
208:
209:
210: /*
211: * map_notSemaphore() MMAP negative block if semaphore isn`t signaled
212: *
213: * @s = Session item
214: * return: none
215: */
216: void map_notSemaphore(ait_sess_t * __restrict s);
217: /*
218: * map_isSemaphoreOK() MMAP Check semaphore
219: *
220: * @s = Session item
221: * return: -1 error: can`t return semaphore, 0 = false, 1 = true
222: */
223: int map_isSemaphoreOK(ait_sess_t * __restrict s);
224: /*
225: * map_incSemaphore() MMAP unblock semaphore, increment semaphore
226: *
227: * @s = Session item
228: * return: 0 Ok, -1 error: can`t increment
229: */
230: int map_incSemaphore(ait_sess_t * __restrict s);
231: /*
232: * map_decSemaphore() MMAP block semaphore, decrement semaphore
233: *
234: * @s = Session item
235: * return: 0 Ok, -1 error: can`t decrement
236: */
237: int map_decSemaphore(ait_sess_t * __restrict s);
238:
239: /*
240: * ipc_notSemaphore() IPC negative block if semaphore isn`t signaled
241: *
242: * @s = Session item
243: * return: none
244: */
245: void ipc_notSemaphore(ait_sess_t * __restrict s);
246: /*
247: * ipc_isSemaphoreOK() IPC Check semaphore
248: *
249: * @s = Session item
250: * return: -1 error: can`t return semaphore, 0 = false, 1 = true
251: */
252: int ipc_isSemaphoreOK(ait_sess_t * __restrict s);
253: /*
254: * ipc_incSemaphore() IPC unblock semaphore, increment semaphore
255: *
256: * @s = Session item
257: * return: 0 Ok, -1 error: can`t increment
258: */
259: int ipc_incSemaphore(ait_sess_t * __restrict s);
260: /*
261: * ipc_decSemaphore() IPC block semaphore, decrement semaphore
262: *
263: * @s = Session item
264: * return: 0 Ok, -1 error: can`t decrement
265: */
266: int ipc_decSemaphore(ait_sess_t * __restrict s);
267:
268:
269: /* --------------------------------------------------------- */
270:
271: #define ALLOC_MEMORY(sd, siz, s, ...) (assert((s)), (s)->sess.create((sd), \
272: (siz), (s), ## __VA_ARGS__))
273: #define ATTACH_MEMORY(s) (assert((s)), (s)->sess.attach((s), NULL))
274: #define DETACH_MEMORY(s) do { assert((s)); (s)->sess.detach((s)); } while(0)
275: #define FREE_MEMORY(s) do { assert((s)); (s)->sess.destroy((s)); } while(0)
276:
277: #define IS_SEMOK(s) (assert((s)), (s)->sess.isSemOK((s)))
278: #define INC_SEM(s) (assert((s)), (s)->sess.incSem((s)))
279: #define DEC_SEM(s) (assert((s)), (s)->sess.decSem((s)))
280: #define NOT_SEM(s) do { assert((s)); (s)->sess.notSem((s)); } while(0)
281:
282: /* --------------------------------------------------------- */
283:
284: /*
285: * sess_FreeValues() Free all values from value array allocated from sess_GetValues()
286: *
287: * @ppsVals = Array strings
288: * return: none
289: */
290: inline void sess_FreeValues(char *** __restrict ppsVals);
291: /*
292: * sess_GetValues() Get all values from session shared memory
293: *
294: * @s = Session item
295: * @ppsVals = Return array strings
296: * return: -1 error: in parameter, !=-1 count of returned strings in ppsVals (must be free after use!)
297: */
298: int sess_GetValues(ait_sess_t * __restrict s, char ***ppsVals);
299: /*
300: * sess_GetValue() Get value from session shared memory from attribute
301: *
302: * @s = Session item
303: * @csAttr = Attribute for search
304: * @psVal = Return string buffer
305: * @pnLen = Length of return string buffer,
306: // *{pnLen} input is max_size of buffer & output is really taken bytes
307: * return: 0 not found, -1 error: in parameter, >0 get position, if define item merged with IS_DEF
308: */
309: int sess_GetValue(ait_sess_t * __restrict s, const char *csAttr, char *psVal, int *pnLen);
310: /*
311: * sess_DelValue() Delete item from session shared memory
312: *
313: * @s = Session item
314: * @csAttr = Attribute for erasing
315: * return: 0 Ok, -1 error: in parameter
316: */
317: int sess_DelValue(ait_sess_t * __restrict s, const char *csAttr);
318: /*
319: * sess_SetValue() Set item into session shared memory or update if find it
320: *
321: * @s = Session item
322: * @csAttr = Attribute
323: * @psVal = Value
324: * return: 0 nothing, -1 error: in parameter,
325: >0 set position, if add item merged with IS_ADD and if define item merged with IS_DEF
326: */
327: int sess_SetValue(ait_sess_t * __restrict s, const char *csAttr, const char *psVal);
328:
329: /*
330: * sess_prepareSession() Attach to shared memory and de-marshaling data
331: *
332: * @s = Session
333: * @useDirect = Use direct shared memory if !=0 or snapshot of data to array
334: * return: NULL error or no data, !=NULL array with variables,
335: * after use must free resources with sess_doneSession()
336: */
337: array_t *sess_prepareSession(ait_sess_t * __restrict s, char useDirect);
338: /*
339: * sess_doneSession() Free resources allocated with sess_prepareSession()
340: *
341: * @s = Session
342: * @arr = Array with variables for free
343: * return: none
344: */
345: void sess_doneSession(ait_sess_t * __restrict s, array_t ** __restrict arr);
346: /*
347: * sess_commitSession() Commit data to shared memory
348: *
349: * @s = Session
350: * @arr = Array with variables for save
351: * return -1 error or !=-1 size of stored variables into shared memory
352: */
353: int sess_commitSession(ait_sess_t * __restrict s, array_t * __restrict arr);
354:
355:
356: #endif
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