#include <stdio.h>#include <unistd.h>#include <sys/types.h>#include <sys/mman.h>#include <sys/stat.h>#include <fcntl.h>#include "mbuff.h"struct mbuff_request_struct req={0,"mybuf",0,0};;void usage(char * program) {	printf("usage: %s <shm_name>\n<shm_name> is max %d characters long\n",		program,sizeof(req.name)-1);}main (int argc,char **argv){	int fd;   	if(argc != 2 ) {		usage(argv[0]);		exit(1);	}	strncpy(req.name,argv[1],sizeof(req.name));	req.name[sizeof(req.name)-1]='\0';	if(( fd = open(MBUFF_DEV_NAME,O_RDWR) ) < 0 ){		perror("open failed");		exit(2);	}	printf("%s shared memory area was %d bytes long\n",req.name,		ioctl(fd,IOCTL_MBUFF_DEALLOCATE,&req));	return(0);}