UNIX for Advanced & Expert Users

I'm having an issue implementing my semaphores....

The following is how I'm setting up the semaphore.

First: I get the semkey (which I've wrapped in an IF statement using perror() but in an attempt to keep the code clutter free I've removed it here)

semkey = ftok("./request", 'S' )

Second: I get the semid (again wrapped in an IF statement )

semid = semget ( semkey, 1, 0666 | IPC_CREAT )

Third: I initialise semaphore #0 to 1

arg.val = 1
semctl ( semid, 0, SETVAL, arg )


The following is where the problem is occuring (it seems), this is where I'm actually using the semaphore - semop() - to allow access to a shared memory segment (critical code)

while ( allocate.sem_op == -1 )
{
//printf ( "waiting for semaphore to release\n" );
}

allocate.sem_op = -1;
if ( semop( semid, &allocate, 1 ) == -1 )
{
perror ("Semaphore error3: semop()");
exit(1);
}


//CRITICAL CODE HERE


allocate.sem_op = 1;
if ( semop( semid, &allocate, 1 ) == -1 )
{
perror ("Semaphore error4: semop()");
exit(1);
}



I've left a fair bit of the code out, such as struct sembuf and union semun stuff, but that appears to be working properly.....

The error I'm getting is this:

Semaphore error4: semop(): File too large


Where should I look or what is it that I'm doing wrong?

Wrong subforum - should be moved to
High Level Programming - The UNIX Forums