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/*

 * l4/posix glue for lseek()

 *

 * Copyright (C) 2007 Bahadir Balban

 */

#include <errno.h>

#include <stdio.h>

#include <sys/types.h>

#include <unistd.h>

#include <l4lib/ipcdefs.h>

#include <libposix.h>

static inline off_t l4_lseek(int fildes, off_t offset, int whence)

{

        off_t offres;

        write_mr(L4SYS_ARG0, fildes);

        write_mr(L4SYS_ARG1, offset);

        write_mr(L4SYS_ARG2, whence);

        /* Call pager with shmget() request. Check ipc error. */

        if ((offres = l4_sendrecv(pagerid, pagerid, L4_IPC_TAG_LSEEK)) < 0) {

                print_err("%s: L4 IPC Error: %d.\n", __FUNCTION__, offres);

                return offres;

        }

        /* Check if syscall itself was successful */

        if ((offres = l4_get_retval()) < 0) {

                print_err("%s: OPEN Error: %d.\n", __FUNCTION__, (int)offres);

                return offres;

        }

        return offres;

}

off_t lseek(int fildes, off_t offset, int whence)

{

        int ret = l4_lseek(fildes, offset, whence);

        /* If error, return positive error code */

        if (ret < 0) {

                errno = -ret;

                return -1;

        }

        /* else return value */

        return ret;

}