Problem to copy variable of structure into share memory!!

Hi…QNX6 lovers…

I try to create share memory and then copy the certain structure of variable using memcpy(). Unfortunately, my program terminate when calling memcpy() and apear output as below:

size of abc :16
Bus error (core dumped)

The codes are:

#include <stdio.h>
#include <fcntl.h> /for shm_open()/
#include <sys/mman.h>/for mmap()/
#include <string.h>

struct test {
int n;
bool flag;


static test abc[] = { {99,true},{55,false}};

int main(){

int fd;
test* lptest;

fd = shm_open(“test”,O_RDONLY|O_CREAT , 0666);


lptest = (test*)mmap(NULL,sizeof(abc),PROT_READ,MAP_SHARED,fd,0);

printf(“size of abc : %d \n”, sizeof(abc));
memcpy(lptest,abc,sizeof(abc)); /program terminate here!/
printf(“success to copy variable abc into share memory\n”);


return 0;

Why this happen? Any suggestion? Help me…


PROT_READ?I think it should be “PROT_READ|PROT_WRITEâ€

You should also do error checking of each function call.

Yeah!.. Sorry…It should be PROT_READ and O_RDWR for mmap and shm_open. Thanks all!