40 lines
1 KiB
C
40 lines
1 KiB
C
#include "libnazgul.h"
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int msgBufferGetFreeIndex(msgPoolData * poolDataTabAddr,int poolIndex){
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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,(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)){ i++; }
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if (i == bufferInfoNb){ return -1; }
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bufferFreeIndex=i;
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if (munmap(bufferInfoTabAddr,bufferInfoNb*sizeof(msgBufferInfo))< 0)
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{
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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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