개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(1M)을 검색하려면 섹션에서 1M 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

bcopy(9f)

bcopy(9F)                      Kernel Functions                      bcopy(9F)



NAME
       bcopy - copy data between address locations in the kernel

SYNOPSIS
       #include <sys/types.h>
       #include <sys/sunddi.h>

       void bcopy(const void *from, void *to, size_t bcount);

INTERFACE LEVEL
       Architecture independent level 1 (DDI/DKI).

PARAMETERS
       from      Source address from which the copy is made.


       to        Destination address to which copy is made.


       bcount    The number of bytes moved.


DESCRIPTION
       The  bcopy()  function  copies  bcount bytes from one kernel address to
       another. If the input and output addresses overlap,  the  command  exe‐
       cutes, but the results may not be as expected.


       Note that bcopy() should never be used to move data in or out of a user
       buffer, because it has no provision for handling page faults. The  user
       address  space  can  be  swapped  out  at  any time, and bcopy() always
       assumes that there will be no paging faults.  If  bcopy()  attempts  to
       access  the  user buffer when it is swapped out, the system will panic.
       It is safe to use bcopy() to move data within kernel space, since  ker‐
       nel space is never swapped out.

CONTEXT
       The bcopy() function can be called from user, interrupt, or kernel con‐
       text.

EXAMPLES
       Example 1 Copying data between address locations in the kernel:



       An I/O request is made for data stored in a RAM disk. If the I/O opera‐
       tion  is a read request, the data is copied from the RAM disk to a buf‐
       fer (line 8). If it is a write request, the data is copied from a  buf‐
       fer  to the RAM disk (line 15). bcopy() is used since both the RAM disk
       and the buffer are part of the kernel address space.


          1 #define RAMDNBLK 1000                /* blocks in the RAM disk */
          2 #define RAMDBSIZ 512                 /* bytes per block */
          3 char ramdblks[RAMDNBLK][RAMDBSIZ];   /* blocks forming RAM
                                                 /* disk
                 ...
          4
          5 if   (bp->b_flags & B_READ)      /* if read request, copy data */
          6                                  /* from RAM disk data block */
          7                                  /* to system buffer */
          8           bcopy(&ramdblks[bp->b_blkno][0], bp->b_un.b_addr,
          9               bp->b_bcount);
         10
         11 else                             /* else write request, */
         12                                  /* copy data from a */
         13                                  /* system buffer to RAM disk */
         14                                  /* data block */
         15           bcopy(bp->b_un.b_addr, &ramdblks[bp->b_blkno][0],
         16               bp->b_bcount);


SEE ALSO
       copyin(9F), copyout(9F)


       Writing Device Drivers in Oracle Solaris 11.4

WARNINGS
       The from and to addresses must be within the  kernel  space.  No  range
       checking  is  done.  If  an  address  outside  of  the  kernel space is
       selected, the driver may corrupt the system in an unpredictable way.



Oracle Solaris 11.4               16 Jan 2006                        bcopy(9F)