lflinit.c

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/* lflinit.c - lflinit */

#include <xinu.h>

struct  lflcblk lfltab[Nlfl];       /* Pseudo-device control blocks */

/*------------------------------------------------------------------------
 * lflinit  -  Initialize control blocks for local file pseudo-devices
 *------------------------------------------------------------------------
 */
devcall lflinit (
      struct dentry *devptr     /* Entry in device switch table */
    )
{
    struct  lflcblk *lfptr;     /* Ptr. to control block entry  */
    int32   i;          /* Walks through name array */

    lfptr = &lfltab[ devptr->dvminor ];

    /* Initialize control block entry */

    lfptr->lfstate = LF_FREE;   /* Device is currently unused   */
    lfptr->lfdev = devptr->dvnum;   /* Set device ID        */
    lfptr->lfmutex = semcreate(1);  /* Create the mutex semaphore   */

    /* Initialize the directory and file position */

    lfptr->lfdirptr = (struct  ldentry *) NULL;
    lfptr->lfpos = 0;
    for (i=0; i<LF_NAME_LEN; i++) {
        lfptr->lfname[i] = NULLCH;
    }

    /* Zero the in-memory index block and data block */

    lfptr->lfinum = LF_INULL;
    memset((char *) &lfptr->lfiblock, NULLCH, sizeof(struct lfiblk));
    lfptr->lfdnum = 0;
    memset((char *) &lfptr->lfdblock, NULLCH, LF_BLKSIZ);

    /* Start with the byte beyond the current data block */

    lfptr->lfbyte = &lfptr->lfdblock[LF_BLKSIZ];
    lfptr->lfibdirty = lfptr->lfdbdirty = FALSE;
    return OK;
}