1 /* 2 * Copyright (c) 2013 Larisa Grigore <larisagrigore@gmail.com>. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. All advertising materials mentioning features or use of this software 13 * must display the following acknowledgement: 14 * This product includes software developed by Adam Glass and Charles 15 * Hannum. 16 * 4. The names of the authors may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef _SYSV_SHM_H_ 32 #define _SYSV_SHM_H_ 33 34 #include <sys/ipc.h> 35 36 /* This flag is used to mark a semaphore group 37 * as removed by another process. 38 */ 39 #define SEG_ALREADY_REMOVED 2 40 41 struct shm_data { 42 int fd; /* The file descriptor of the file used as 43 shared memory. */ 44 size_t size; 45 int shmid; 46 int type; /* shm, sem, msg or undo; 47 undo segments are used for semops with UNDO flag set. */ 48 void *internal; 49 int used; /* Number of thread that use this segment. */ 50 int removed; /* The segment was mark for removal by a thread. */ 51 int access; /* Used only for sems to avoid a segfault when try to 52 access a semaphore wthout permission. */ 53 }; 54 55 int _shmget(key_t, size_t, int, int); 56 void shmchild(void); 57 58 int sysvipc_shmget (key_t, size_t, int); 59 int sysvipc_shmctl (int, int, struct shmid_ds *); 60 void *sysvipc_shmat (int, const void *, int); 61 int sysvipc_shmdt (const void *); 62 63 struct shm_data *get_shmdata(int, int, int); 64 int set_shmdata_access(int, int); 65 66 #endif /* !_SYSV_SHM_H_ */ 67