shmget failed

Jennifer Lai
Fri Feb 25 22:29:00 GMT 2005

I have handled error in my code,
if (shmid==-1) {
   fprintf(stderr, "cannot create shared region.\n");
But this code is not executed unless I comment out
shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | 0600);

I read somewhere that ipc-daemon2 should be up and running. So, I checked it,

% cygrunsrv -Q ipc-daemon2
cygrunsrv: Error querying a service: OpenService: Win32 error 1060:
The specified service does not exist as an installed service. 

% ipc-daemon2
(ipc-daemon2) IPC-daemon is already started!!
(ipc-daemon2) Unable to start IPC-daemon!

%ipcs -m
Bad system call

Does these errors have to do with why shmget failed?
and, how would I be able to fix them?


----Original Message----
>From: cygwin-owner On Behalf Of Jennifer Lai 
>Sent: 25 February 2005 19:25

> Hi,
>    I got bad system call error when I tried to compile a program that
> contains the following code,
> shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | 0600);
> where, size = 661552
> At first I thought it has to do with the size, but reducing the size to
> 128 still cause bad system call error.
> Does anyone know what caused shmget to fail?

  Yes, *you* do.  Check errno.


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