sem_open really strange behavior

[Andrew Bell]

On Tue, Jun 22, 2010 at 8:16 AM, Sergio Sobarzo <ssobarzo@gmail.com> wrote:
> Hi,
>
> I'm writing an application using semaphores. Here is a simple code
> recreating the problem:
>
> ***********************************************
> #include <sys/types.h>
> #include <stdio.h>
> #include <semaphore.h>
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <fcntl.h>
> #include <stdlib.h>
>
> int main()
> {
>  int ok;
> //key_t t;
> char *shm,*s;
> sem_t *mutex;
>
>  mutex = sem_open("/vik",O_CREAT|O_EXCL);
>  if(mutex == SEM_FAILED)
>    {
>      perror("unable to create semaphore");
>      sem_unlink("vik");
>      exit(-1);
>    }
>
>  sem_close(mutex);
>  sem_unlink("vik");
>  exit(0);
> }
> ************************************************

The man page for sem_open says that if you include O_CREAT as a flag
you must also provide the mode and value arguments.  Have you tried
that?

P.S. - This isn't a gcc issue - you should probably post this to a
general UNIX programming list.

Best,

-- 
Andrew Bell
andrew.bell.ia@gmail.com