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KVM_READ(3K)                                                      KVM_READ(3K)



NAME
       kvm_read,  kvm_write  -  copy data to or from a kernel image or running
       system

SYNOPSIS
       #include <&lt;kvm.h>&gt;

       int kvm_read(kd, addr, buf, nbytes)
       kvm_t *kd;
       unsigned long addr;
       char *buf;
       unsigned nbytes;

       int kvm_write(kd, addr, buf, nbytes)
       kvm_t *kd;
       unsigned long addr;
       char *buf;
       unsigned nbytes;

DESCRIPTION
       kvm_read() transfers data from the kernel image specified  by  kd  (see
       kvm_open(3K))  to  the  address  space of the process.  nbytes bytes of
       data are copied from the kernel virtual address given by  addr  to  the
       buffer pointed to by buf.

       kvm_write()  is  like  kvm_read(),  except  that  the direction of data
       transfer is reversed.  In order to use this function, the  kvm_open(3K)
       call that returned kd must have specified write access.  If a user vir-
       tual address is given, it is resolved  in  the  address  space  of  the
       process specified in the most recent kvm_getu(3K) call.

RETURN VALUES
       On success, kvm_read() and kvm_write() return the number of bytes actu-
       ally transferred.  On failure, they return -1.

SEE ALSO
       kvm_getu(3K), kvm_nlist(3K), kvm_open(3K)



                                24 January 1990                   KVM_READ(3K)