C++ (Cpp) TO_USER_SPACE Examples

Example #1

File: osi_misc.c Project: kcbehler/openafs-osd

void
afs_osi_SetTime(osi_timeval_t * tvp)
{
#if defined(AFS_LINUX24_ENV)
    struct timeval tv;
    tv.tv_sec = tvp->tv_sec;
    tv.tv_usec = tvp->tv_usec;

    AFS_STATCNT(osi_SetTime);

    do_settimeofday(&tv);
#else
    extern int (*sys_settimeofdayp) (struct timeval * tv,
                                     struct timezone * tz);

    KERNEL_SPACE_DECL;

    AFS_STATCNT(osi_SetTime);

    TO_USER_SPACE();
    if (sys_settimeofdayp)
        (void)(*sys_settimeofdayp) (tvp, NULL);
    TO_KERNEL_SPACE();
#endif
}

Example #2

File: osi_file.c Project: SimonWilkinson/openafs

/* osi_rdwr
 * seek, then read or write to an open inode. addrp points to data in
 * kernel space.
 */
int
osi_rdwr(struct osi_file *osifile, uio_t * uiop, int rw)
{
    struct file *filp = &osifile->file;
    KERNEL_SPACE_DECL;
    int code = 0;
    struct iovec *iov;
    afs_size_t count;
    unsigned long savelim;

    savelim = current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur;
    current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;

    if (uiop->uio_seg == AFS_UIOSYS)
	TO_USER_SPACE();

    /* seek to the desired position. Return -1 on error. */
    if (filp->f_op->llseek) {
	if (filp->f_op->llseek(filp, (loff_t) uiop->uio_offset, 0) != uiop->uio_offset)
	    return -1;
    } else
	filp->f_pos = uiop->uio_offset;

    while (code == 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
	iov = uiop->uio_iov;
	count = iov->iov_len;
	if (count == 0) {
	    uiop->uio_iov++;
	    uiop->uio_iovcnt--;
	    continue;
	}

	if (rw == UIO_READ)
	    code = FOP_READ(filp, iov->iov_base, count);
	else
	    code = FOP_WRITE(filp, iov->iov_base, count);

	if (code < 0) {
	    code = -code;
	    break;
	} else if (code == 0) {
	    /*
	     * This is bad -- we can't read any more data from the
	     * file, but we have no good way of signaling a partial
	     * read either.
	     */
	    code = EIO;
	    break;
	}

	iov->iov_base += code;
	iov->iov_len -= code;
	uiop->uio_resid -= code;
	uiop->uio_offset += code;
	code = 0;
    }

    if (uiop->uio_seg == AFS_UIOSYS)
	TO_KERNEL_SPACE();

    current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur = savelim;

    return code;
}