On Dec 14 08:04, Steven Bardwell wrote: > I would like my Cygwin programs to work from a DOS (CMD.exe) window, but I > am > having problems with some API calls. Here is a simple program that tries to > create > a semaphore it works fine when it is run from sh.exe (or in a mintty > window), but > it crashes when run in a DOS window. (The Cygwin service is running.) > > Is there a way to make it work in both environments?
That's not the intention of the IPC calls. They usually only work if you set up a matching environment. XSI IPC requires cygserver to run. The XSI IPC structures are only kept in memory and "something" has to keep them around and coordinate their rather complex mechanics. If cygserver isn't running, the XSI IPC calls return ENOSYS. If you need persistent semaphores, message queues or shared memory, consider switching to POSIX IPC (sem_open, mq_open, shm_open and friends). They are backed by the filesystem, namely the Cygwin directories /dev/mqueue and /dev/shm. This makes them easier to work with from a DOS shell. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat
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