45 lines
777 B
C
45 lines
777 B
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <malloc.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/mman.h>
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int main( int argc, char **argv)
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{
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int fd;
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int * compteur;
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if(argc != 2)
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{
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fprintf(stderr, "Syntaxe : %s nom_segment\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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if((fd = shm_open(argv[1], O_RDWR | O_CREAT, 0600)) == -1)
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{
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perror(argv[1]);
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exit(EXIT_FAILURE);
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}
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if(ftruncate(fd, sizeof(int)) != 0)
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{
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perror("ftruncate");
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exit(EXIT_FAILURE);
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}
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compteur = mmap(NULL, sizeof(int), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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if(compteur == MAP_FAILED)
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{
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perror("mmap");
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exit(EXIT_FAILURE);
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}
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while(1)
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{
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(* compteur)++;
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fprintf(stdout, "compteur = %d\n", (* compteur));
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sleep(1);
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}
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return EXIT_SUCCESS;
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}
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