share memory and memory map problem

QNX USERS QNX6 - Applications
1

I got a problem upgrading shared memory from QNX4.0 to Neutrino and this is the problem:

int mem;
unsigned char *where

where=mmap(o, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, mem, 0)

mem=shm_open(“mem_test”, O_CREAT|O_RDWR, 0777)

if(where!=(void*0-1)
{
strcpy(where, “original string”);
…
}

The complier complains about the strcpy. Why is that? thanks.

2

Try to change the order of your function calls. First shm_open, then use ftruncate(when you are creating the shared mem). After that use the mmap function.
Good luck
Frank 8)

3

Hi

Apart from mistake in your code (which Frank pointed out), you can fix the compiler error by-

  1. Quick-method
    a) Use qcc !
    b) Use “-fno-builtin -fhonor-std” options with gcc/g++
    c) Prefix “std::” with all functions you get error like “std::strcpy”

  2. Read the “namespaces” chapter from Stroupstrop (sorry spelling mistake probably) or Bruce Eckle’s Thinking in C++ (available online or free from eckleobjects.com)

HTH
_ Akhilesh Mritunjai

4

Next time, try the programming groups for programming questions.
/Johan