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uiomove (9)
  • >> uiomove (9) ( Solaris man: Ядро )
  • uiomove (9) ( FreeBSD man: Ядро )
  •  

    NAME

    uiomove - copy kernel data using uio structure 
     
    

    SYNOPSIS

    #include <sys/types.h>
    #include <sys/uio.h>
    
    
    
    int uiomove(caddr_t address, size_t nbytes, enum uio_rw rwflag, 
        uio_t *uio_p);
    

     

    INTERFACE LEVEL

    Architecture independent level 1 (DDI/DKI).  

    PARAMETERS

    address

    Source/destination kernel address of the copy.

    nbytes

    Number of bytes to copy.

    rwflag

    Flag indicating read or write operation. Possible values are UIO_READ and UIO_WRITE.

    uio_p

    Pointer to the uio structure for the copy.

     

    DESCRIPTION

    The uiomove() function copies nbytes of data to or from the space defined by the uio structure (described in uio(9S)) and the driver.

    The uio_segflg member of the uio(9S) structure determines the type of space to or from which the transfer is being made. If it is set to UIO_SYSSPACE, the data transfer is between addresses in the kernel. If it is set to UIO_USERSPACE, the transfer is between a user program and kernel space.

    rwflag indicates the direction of the transfer. If UIO_READ is set, the data will be transferred from address to the buffer(s) described by uio_p. If UIO_WRITE is set, the data will be transferred from the buffer(s) described by uio_p to address.

    In addition to moving the data, uiomove() adds the number of bytes moved to the iov_base member of the iovec(9S) structure, decreases the iov_len member, increases the uio_offset member of the uio(9S) structure, and decreases the uio_resid member.

    This function automatically handles page faults. nbytes does not have to be word-aligned.  

    RETURN VALUES

    The uiomove() function returns 0 upon success or EFAULT on failure.  

    CONTEXT

    User context only, if uio_segflg is set to UIO_USERSPACE. User, interrupt, or kernel context, if uio_segflg is set to UIO_SYSSPACE.  

    SEE ALSO

    ureadc(9F), uwritec(9F), iovec(9S), uio(9S)

    Writing Device Drivers  

    WARNINGS

    If uio_segflg is set to UIO_SYSSPACE and address is selected from user space, the system may panic.


     

    Index

    NAME
    SYNOPSIS
    INTERFACE LEVEL
    PARAMETERS
    DESCRIPTION
    RETURN VALUES
    CONTEXT
    SEE ALSO
    WARNINGS


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