shm_printmap.c

#include <stdio.h>
#include <sys/shm.h>
#include <sys/stat.h>
#include "map_definitions.h"

int main ()
{
        int segment_id;
        char *shared_memory;
        char c;
        int i, j ;
        const int shared_segment_size = sizeof(char) * MAP_WIDTH * MAP_HEIGHT;

        /* Get segment identificator in a read only mode  */
        segment_id = shmget (SHM_MAP_KEY, shared_segment_size,
                             S_IRUSR );

        /* Attach the shared memory segment */
        shared_memory = (char*) shmat (segment_id, (void*) 0, 0);

        /* Main boucle */
        do{
                printf("\n+");
                for(i=0;i<MAP_WIDTH;i++) printf("-");
                printf("+\n");
                for (j=0;j<MAP_HEIGHT;j++){
                        printf("|");
                        for(i=0;i<MAP_WIDTH;i++) printf("%c", *(shared_memory+i+j*MAP_WIDTH));
                        printf("|\n");
                }
                printf("+");
                for(i=0;i<MAP_WIDTH;i++) printf("-");
                printf("+\n");
                printf("\n\nPress any key to reload map, q to quit\n");
                scanf ("%c",&c);

        } while (c!= 'q');
        /* Detach the shared memory segment.  */
        shmdt (shared_memory);

        return 0;
}

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