44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
#include "libnazgul.h"
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int msgBufferGetFreeIndex(msgPoolData * poolDataTabAddr, int poolIndex)
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{
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msgBufferInfoTabId bufferInfoTabId;
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int bufferInfoTabFd;
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msgBufferInfo *bufferInfoTabAddr;
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int bufferInfoNb;
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int bufferFreeIndex;
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int i;
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//récuperer l'ID du BufferInfoTab;
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strcpy(bufferInfoTabId, poolDataTabAddr[poolIndex].bufferInfoTabId);
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bufferInfoTabFd = shm_open(bufferInfoTabId, O_RDWR, SHM_DEFAULT_MODE);
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if (bufferInfoTabFd < 0) {
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NZG_ERROR("shm_open", bufferInfoTabId);
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return -1;
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}
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/** on regarde dans le tableau d'infos de buffer **/
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bufferInfoNb = poolDataTabAddr[poolIndex].bufferNb;
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bufferInfoTabAddr = mmap(NULL, bufferInfoNb * sizeof(msgBufferInfo),
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PROT_READ, MAP_SHARED, bufferInfoTabFd,
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(off_t) 0);
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i = 0;
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while ((i < bufferInfoNb)
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&& (bufferInfoTabAddr[i].ownerPid != (pid_t) - 1)) {
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i++;
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}
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if (i == bufferInfoNb) {
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return -1;
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}
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bufferFreeIndex = i;
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if (munmap(bufferInfoTabAddr, bufferInfoNb * sizeof(msgBufferInfo)) < 0) {
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NZG_ERROR("munmap", bufferInfoTabId);
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return -1;
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}
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return bufferFreeIndex;
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}
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