rflseek.c

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/* rflseek.c - rflseek */

#include <xinu.h>

/*------------------------------------------------------------------------
 * rflseek  -  Change the current position in an open file
 *------------------------------------------------------------------------
 */
devcall rflseek (
      struct dentry *devptr,    /* Entry in device switch table */
      uint32 pos            /* New file position        */
    )
{
    struct  rflcblk *rfptr;     /* Pointer to control block */

    /* Wait for exclusive access */

    wait(Rf_data.rf_mutex);

    /* Verify remote file device is open */

    rfptr = &rfltab[devptr->dvminor];
    if (rfptr->rfstate == RF_FREE) {
        signal(Rf_data.rf_mutex);
        return SYSERR;
    }

    /* Set the new position */

    rfptr->rfpos = pos;
    signal(Rf_data.rf_mutex);
    return OK;
}