/* pipeopen.c - pipeopen */

#include 

/*------------------------------------------------------------------------
 *  pipeopen  -  open one of the pipe pseudo devices
 *------------------------------------------------------------------------
 */
devcall pipe_open(
          struct dentry *devptr,        /* Entry in device switch table */
          char  *buff,                  /* Not used                     */
          int32 count                   /* Not used                     */
        )
{
        struct  pipecblk *piptr;        /* Pointer to pipe control block*/
        int     i;                      /* Walks through control blocks */

        /* Find a pipe pseudo device that is available */

        for (i=0; ipstate == PIPE_FREE) {
                        break;
                }
        }
        if (i >= Npip) {
                return SYSERR;
        }

        piptr->pstate = PIPE_OPEN;
        piptr->pcsem = semcreate(0);
        piptr->ppsem = semcreate(PIPE_BUF_SIZE);
        piptr->phead = piptr->ptail = 0;
        piptr->pavail= 0;
        return piptr->pdevid;
}