I am working on a shared memory assignment on Mac OS X
#define SHARED_OBJECT_PATH "/my_shared_memory"
fd = shm_open(SHARED_OBJECT_PATH, O_CREAT | O_EXCL | O_RDWR, S_IRWXU | S_IRWXG);
if (fd < 0) {
perror("In shm_open()");
exit(1);
}
One of the small snippets in the program is the above.
When I compile and run the program a second time, I would get the error:
In shm_open(): File exists
I am assuming because I need to manually delete using rm [path_to]/my_shared_memory. I know on Linux, the default location is dev/shm, however, this path does not exist on Mac OS X.
Where is the location of my_shared_memory so I can delete it?
The simplest solution to your problem is not using
O_EXCL
if you don't want that behaviour.
Generally, shared memory objects do have a name, but it's not really a file name -- you can't generally delete them. It's good POSIX style to display them under /dev/shm, but this depends on your OS:
My best guess would be that you should read what man shm_open says on your machine.