91 lines
2.0 KiB
C
91 lines
2.0 KiB
C
/*
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* Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
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*
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* This program is free software: you can use, redistribute, and/or modify
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* it under the terms of the GNU Affero General Public License, version 3
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* or later ("AGPL"), as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define ALLOW_FORBID_FUNC
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#define _DEFAULT_SOURCE
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#include "os.h"
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#define MAX_SHMIDS 6
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static int32_t shmids[MAX_SHMIDS] = {0};
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static void taosDeleteCreatedShms() {
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for (int32_t i = 0; i < MAX_SHMIDS; ++i) {
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int32_t shmid = shmids[i] - 1;
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if (shmid >= 0) {
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shmctl(shmid, IPC_RMID, NULL);
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}
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}
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}
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int32_t taosCreateShm(SShm* pShm, int32_t key, int32_t shmsize) {
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pShm->id = -1;
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#if 1
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key_t __shkey = IPC_PRIVATE;
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int32_t __shmflag = IPC_CREAT | IPC_EXCL | 0600;
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#else
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key_t __shkey = 0X95270000 + key;
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int32_t __shmflag = IPC_CREAT | 0600;
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#endif
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int32_t shmid = shmget(__shkey, shmsize, __shmflag);
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if (shmid < 0) {
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return -1;
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}
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void* shmptr = shmat(shmid, NULL, 0);
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if (shmptr == NULL) {
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return -1;
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}
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pShm->id = shmid;
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pShm->size = shmsize;
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pShm->ptr = shmptr;
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#if 0
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if (key >= 0 && key < MAX_SHMIDS) {
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shmids[key] = pShm->id + 1;
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}
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atexit(taosDeleteCreatedShms);
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#else
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shmctl(pShm->id, IPC_RMID, NULL);
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#endif
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return 0;
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}
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void taosDropShm(SShm* pShm) {
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if (pShm->id >= 0) {
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if (pShm->ptr != NULL) {
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shmdt(pShm->ptr);
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}
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shmctl(pShm->id, IPC_RMID, NULL);
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}
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pShm->id = -1;
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pShm->size = 0;
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pShm->ptr = NULL;
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}
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int32_t taosAttachShm(SShm* pShm) {
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errno = 0;
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void* ptr = shmat(pShm->id, NULL, 0);
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if (errno == 0) {
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pShm->ptr = ptr;
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}
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return errno;
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}
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