43 lines
934 B
C
43 lines
934 B
C
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/* Mecanismes de communication entre processus - IPC */
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/*
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/* met a zero l' entier long de la mem par*/
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#include <stdlib.h>
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <stdio.h>
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#define SHMEM_RIGHTS 0x01ff
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/* droits d'acc<63>s dans la zone de m<>more partg<74>e: 1ff */
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int main (int argc, char ** argv) {
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/* l'identificateur externe (key) de la zone de m<>moire partag<61>e
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est un nombre entier transmis en param<EFBFBD>tre par l'utilisateur */
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int ipc_key ;
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int ipc_result ;
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long *ptz;
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int i;
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if (argc<2)
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exit(1);
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ipc_key = atoi(argv[1]) ;
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ipc_result = shmget(ipc_key, 0,0);
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if (ipc_result != -1)
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{
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printf(" - Succes !! -\n");
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ptz = (long *) shmat(ipc_result, 0, SHMEM_RIGHTS) ;
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printf("remise a zero ( %ld ) ", *ptz);
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*ptz = 0;
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}
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else
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printf(" Erreur :%d \n",ipc_result);
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exit(0) ;
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}
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