Unmap previously mapped addresses
#include <sys/mman.h> int munmap( void * addr, size_t len );
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The munmap() function removes any mappings for pages in the address range starting at addr and continuing for len bytes, rounded up to the next multiple of the page size. Subsequent references to these pages cause a SIGSEGV signal to be set on the process.
If there are no mappings in the specified address range, then munmap() has no effect.
POSIX 1003.1 MF|SHM|TYM
Currently, you can't munmap() just a part of an area mapped with mmap().
mmap(), mprotect(), munmap_flags(), shm_open(), shm_unlink()
“Initializing allocated memory” in the Interprocess Communication (IPC) chapter of the System Architecture guide