id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7928	boost::interprocess::shared_memory_object creation cause infinite loop	lsopko@…	Ion Gaztañaga	"Call of '''boost::interprocess::shared_memory_object''' creation cause infinite loop in case there is:
boost::interprocess::shared_memory_object shm (                                                           boost::interprocess::open_or_create,                                                                           ""some-name"",                                                                           boost::interprocess::read_write,                                                                           256);
I dig inside of code and it happen in file:

'''boost/interprocess/shared_memory_object.hpp'''

 this function :

inline '''bool''' '''shared_memory_object::priv_open_or_create'''
   (ipcdetail::create_enum_t type,
    const char *filename,
    mode_t mode, const permissions &perm)
{
.....

in switch/case:
....
case '''ipcdetail::DoOpenOrCreate''':
      {
         oflag |= O_CREAT;
         //We need a loop to change permissions correctly using fchmod, since
         //with ""O_CREAT only"" shm_open we don't know if we've created or opened the file.
         while(1){
            m_handle = shm_open(m_filename.c_str(), oflag, unix_perm);
            if(m_handle >= 0){
               ::fchmod(m_handle, unix_perm);
               break;
            }
            else if(errno == EEXIST){
               if((m_handle = shm_open(m_filename.c_str(), oflag, unix_perm)) >= 0 || errno != ENOENT){
                  break;
               }
            }
         }
      }

... as you can see there is a while and this while will remain infinite in case of any other errno then: ""'''EEXIST'''""

... there are 9 different errors possible in case of shm_open() call,
so they should be handled, in my case it was EACCES what brick my testing.

I'm testing it on '''1.50''' but saw '''1.52''' have the same code .....

Reagards

Ladislav Sopko
lsopko@3di.it"	Bugs	closed	To Be Determined	interprocess	Boost 1.52.0	Showstopper	fixed