On 11 September 2012 17:23, Bob Furber wrote: > On 12-09-07 04:08 PM, Jonathan Wakely wrote: >> >> On 8 September 2012 00:03, Bob Furber wrote: >>> >>> >>> Why is the client capable of accessing shared memory when executed by >>> root >>> and not able to, when executed by a user? >> >> >> This doesn't sound like it has anything to do with GCC. > > > After a lot of experimentation, I think the problem lies in shm_open(). So nothing to do with GCC then. > The following code generates a /dev/shm/shared with -rw-r--r-- access > privileges, making it inaccessible to others, even though the mode is set to > rw-rw-rw-: > > shmfd = shm_open( shm_name, // shared memory block with this "/name" > O_CREAT, // Create if not already there > 0666 ); // with these access privileges It sounds like your process has a umask of 0022.
